18 results about "Stepwise regression analysis" patented technology

The invention discloses a method for analyzing influence of climate change and human activity on space-time evolution of water resources. The method comprises the following steps: acquiring meteorological information, hydrological information, land utilization information, soil information, social economic information and water resource information of a to-be-detected area; performing trend analysis on the water resource information to obtain a space-time evolution rule of the water resource information; performing attribution analysis on the time-space evolution rule to obtain influence factors of the time-space evolution of the water resource; obtaining the correlation degree of the influence factors and the space-time evolution rule, and completing the analysis of the climate change and human activity on the space-time evolution of the water resource. According to the method, the influence factors of water resource evolution of the to-be-detected area are researched through the multivariate statistical stepwise regression analysis model, the multicollinearity between the related influence factors of climate change and human activity is reduced through the characteristics of stepwise regression analysis, the calculation accuracy is improved, and the sustainable development of water resources is promoted.

The present application discloses a wetland vegetation carbon sequestration potential prediction method and system under the influence of future climate change, belongs to the technical field of wetland vegetation carbon sequestration potential prediction, and comprises the following steps: obtaining the net primary productivity of vegetation, the vegetation coverage, the monthly temperature, the precipitation and the atmospheric carbon dioxide concentration in the historical period and the future period; calculating the annual average net primary productivity of vegetation, the coverage and the multi-year average vegetation coverage; calculating the annual average temperature, the precipitation and the carbon dioxide concentration; extracting the wetland vegetation pixel distribution as the research area range; calculating the ratio of the annual average net primary productivity to the vegetation coverage to obtain the wetland vegetation carbon sequestration potential value in the historical period; adopting the multiple stepwise regression analysis method to build a per-pixel wetland vegetation carbon sequestration potential estimation model; and utilizing the annual temperature, the precipitation and the carbon dioxide concentration in the future period to realize the accurate prediction of the wetland vegetation carbon sequestration potential in the research area range in the future period.

The invention discloses a method for forecasting anthracnose of wine grapes, and particularly belongs to the technical field of plant disease and insect pest forecasting. The method comprises the following steps: carrying out intra-group correlation analysis on climatic factors of threshold number of days before the wine grape anthracnose attack through SPSS to obtain meteorological factors significantly related to the wine grape anthracnose; through stepwise regression analysis, redundant climate factors in the meteorological factors significantly related to the wine grape anthracnose are removed, a multiple linear regression model is constructed, the meteorological factors significantly related to the wine grape anthracnose are screened out, and multicollinearity is avoided; secondly, inputting meteorological data to be measured into the multiple linear regression model, and outputting a prediction result of the disease index of anthracnose; and finally, forecasting the anthracnose of the wine grapes based on the prediction result of the disease index of the anthracnose. The method can prevent and control anthracnose, improve wine grape quality and reduce economic loss.

This application relates to the field of metal bending component manufacturing technology, and discloses a method for controlling the bending radius in progressive forming of tubular materials by spinning and bending. The method includes the following steps: S1, obtaining an optimal combination of loading parameters affecting the forming quality indicators of the tubular material through orthogonal experiments; S2, establishing a regression function between the bending radius and the spinning and bending deformation parameters based on the optimal combination and the Maximin Latin square test results through stepwise regression analysis; S3, testing the regression function; if the test passes, obtaining the regression model of the bending radius; if the test fails, returning to step S2; S4, controlling the bending radius under the optimal loading parameter conditions using the regression model. This application incorporates a diameter reduction parameter into the control method, significantly improving the accuracy of bending radius control compared to existing geometric control models. It reduces the average error between tubular bending radius prediction and control from 10.28% to 5.2%, offering advantages such as high forming accuracy, wide applicability, and higher reliability.

The invention relates to the technical field of data models, in particular to a yellow rice wine quality prediction method, which comprises the following steps: after establishing a yellow rice wine sensory index evaluation table, respectively carrying out sensory analysis on Fujian yellow rice wine in different years to obtain a comprehensive taste actual score; carrying out correlation and significance analysis on physical and chemical components and sensory indexes of the Fujian yellow wine; performing correlation and significance analysis on the color and sensory indexes of the Fujian yellow wine; performing correlation and significance analysis on volatile matter indexes and sensory indexes of the Fujian yellow wine; selecting parameters with significant levels of less than 0.05 in physical and chemical components, color and volatile matters as independent variables, and establishing a sensory comprehensive evaluation and prediction model by taking the comprehensive taste actual score as a dependent variable and adopting stepwise regression analysis; according to the method, the Fujian yellow rice wine in different years is researched, the quality of the Fujian yellow rice wine is evaluated through sensory analysis, electronic nose analysis and physical and chemical analysis, sensory indexes are quantified, datamation indexes for directly evaluating the quality of the Fujian yellow rice wine are obtained, and management and grading are facilitated.

The application discloses a corn variety screening method suitable for soybean-corn 4:2 and 6:4 strip composite planting. Firstly, newly approved or large-area popularized corn varieties are selected, and different growth environment conditions of edge 1 row, edge 2 row and edge 3 row in each variety plot are created through high-density, non-protection row and relatively wide plot spacing. The agronomic characters, dry matter, yield and constituent factors of the edge 1 row, edge 2 row and edge 3 row are analyzed by using the principal component analysis, fuzzy membership function method, stepwise regression analysis and grey correlation degree analysis method, the key indicators reflecting the edge row advantage of corn are selected and identified, and the edge row advantage of the tested corn varieties is evaluated, so that the corn varieties with strong and weak edge row advantages are screened out, and the corn varieties are recommended as suitable for soybean-corn 4:2 and 6:4 strip composite planting. The screening method is suitable for providing reference for corn varieties of different strip type modes of soybean-corn composite planting and improving the strip composite planting benefit.

The invention discloses a natural gas monthly sales volume main influence factor screening method, system and device, and belongs to the technical field of natural gas data, and the main influence factor screening method comprises the steps: preprocessing natural gas monthly sales volume influence factors and natural gas monthly sales volume data; performing correlation analysis on the relationship between the influence factors and the monthly natural gas sales volume to obtain an influence factor set A; determining contribution values of the influence factors to the natural gas monthly sales prediction result to obtain an influence factor set B; determining importance indexes of the influence factors on the monthly natural gas sales volume to obtain an influence factor set C; determining a minimum public set of the influence factor set A, the influence factor set B and the influence factor set C; and through stepwise regression analysis, screening out main influence factors from the minimum public set. According to the method, the main influence factors of the monthly natural gas sales can be comprehensively and accurately identified and screened, and the precision and interpretability of the prediction model are improved.

The invention discloses a method for evaluating bean curd quality by using soybean protein structure indexes and application thereof, and belongs to the technical field of food evaluation. The invention provides a method for evaluating bean curd quality by using a soybean protein structure index in order to overcome the defects that in the prior art, resource waste and economic loss are caused due to the fact that soybean food is produced by adopting mixed varieties in the soybean processing industry, and a method capable of accurately evaluating bean curd applicable soybean varieties is lacked. Protein structure indexes of different varieties of soybeans and quality indexes of bean curds prepared from different varieties of soybeans are utilized to carry out principal component analysis, and stepwise regression analysis is adopted to establish an evaluation system of a linear regression equation. According to the method for evaluating the quality of the bean curd, objectivity and accuracy of bean curd processing suitability evaluation can be improved, and technical support is provided for rapid and accurate bean curd processing suitability evaluation in the soybean industry.

The invention discloses a stepwise regression analysis method-based college student physique test score prediction model, and belongs to the technical field of sports and metering economics. The method comprises the following steps: collecting and preprocessing college student physique test multi-dimensional index data; constructing a multiple linear regression model between the total physical test score and a plurality of explanatory variables; screening significant variables by adopting a stepwise regression analysis method, and optimizing a model structure; performing multi-collinearity, heteroscedasticity and sequence correlation test and correction on the model; and finally verifying the validity of the variable set by using a random forest model. According to the method, key influence factors can be automatically identified from numerous physical indexes, a prediction model with high goodness of fit and high interpretation is constructed, accurate prediction of student physical scores is realized, and a scientific basis is provided for physical health management of colleges and universities.

The application provides a kind of mechanized transplanting seedling quality analysis method and device, the method includes: a plurality of soil physical property parameters are dimensionless, obtain the first dimensionless sequence, and in the case where a plurality of transplanting seedlings are mechanized transplanted by target soil, a plurality of transplanting quality evaluation indexes are dimensionless, obtain the second dimensionless sequence;The correlation between each element in the first dimensionless sequence and each element in the second dimensionless sequence is analyzed, and the correlation between the soil characteristics and the transplanting quality is obtained;Based on the stepwise regression analysis algorithm and significance test algorithm of statistical quantile, the correlation is regressed and analyzed, and the transplanting quality of the actual soil physical property is predicted by the empirical formula obtained by analysis. The method improves the efficiency of mechanized transplanting seedlings, and determines the suitable trend of plug seedlings in different soil environments.

The invention provides a basin rainfall-runoff response relation determination method based on multi-factor influence quantitative analysis, and belongs to the field of hydrological forecasting and water resource management. The method comprises the following steps: firstly, selecting representative factor indexes of three dimensions according to flood related characteristics of typical sessions of a watershed; then, in combination with a Spearman correlation coefficient analysis and stepwise regression analysis method, evaluating the statistical correlation strength of each factor and the runoff production coefficient, screening the factors with relatively strong correlation, constructing a multiple linear regression model, and determining the interaction among the factors; and finally, grading the significant indexes based on a decision tree binning algorithm, dividing flood event groups, and checking and evaluating a grouping effect through inter-group statistics. According to the invention, a multi-factor coupling action mechanism is disclosed, a runoff and convergence mechanism can be accurately reflected, the precision and reliability of a flood forecasting model are improved, and scientific grouping and differential forecasting of flood events are realized.

The invention relates to a method for estimating starch content in a cigar tobacco leaf airing process. Comprising the following steps: detecting color parameters of the front side and the back side of the cigar tobacco in the airing process by using a portable colorimeter, determining the starch content of the cigar tobacco in different airing stages, performing correlation analysis on data obtained in the previous step, performing linear stepwise regression analysis on the color parameters and starch on the basis of the data obtained in the previous step, and determining the starch content of the cigar tobacco. Establishing a starch content estimation model based on color parameters, verifying the established prediction model, and determining the starch content of the cigar tobacco leaves by using the verified prediction model. According to the method disclosed by the invention, the correlation between the color change of the tobacco leaves and the starch in the cigar tobacco leaf airing process is determined, and the estimation model is established, so that the starch content of the tobacco leaves is quickly and nondestructively detected in real time, and reference can be provided for improving the cigar tobacco leaf airing quality and optimizing the tobacco leaf airing process research.

The invention relates to the technical field of oil field chemical sealing water / gas channeling, in particular to a channeling sealing gel main control factor evaluation and optimization method, which comprises the following steps: screening factors and levels influencing the stability of gel based on a stability test experiment; forming a multi-target evaluation system including jelly strength, bound water content, polymer molecular weight, jelly network density, dehydration rate and the like, and configuring different weight coefficients to determine target response; a space sample point database is formed, stepwise regression analysis is utilized to establish a response surface function of the gel stability performance adaptive to the oil reservoir environment, and main control factors of the gel stability performance and an action mechanism of the main control factors are determined; and determining stable formation conditions of the gel system in the fixed aging time and the gel stability under the optimal parameters by using a gradient rising method. According to the method, the main control factors influencing the stability of the gel can be determined, the optimal adaptability of the gel and oil reservoir conditions is determined, and water channeling and carbon dioxide gas channeling channels are permanently and effectively blocked.

The application discloses a buried hill geology pattern identification method while drilling based on multi-source information fusion and belongs to the technical field of oil exploration and development, and comprises the following steps: S1, data collection and processing; S2, stepwise regression analysis method is used to optimize logging element parameters and drilling engineering parameters; S3, a multi-parameter fusion technology based on a LightGBM algorithm is used to build a buried hill geology pattern identification model, namely a LightGBM algorithm model; in the manner, the method combines logging element data and drilling parameters, adopts the stepwise regression analysis method to optimize sensitive parameters, and establishes a geology model identification model through the LightGBM algorithm, so that the identification speed is faster and the accuracy is higher compared with a traditional method; the method can provide a strong basis for efficient on-site exploration and development decision and is favorable to promoting the oil and gas reservoir exploration and development process.

The invention provides a prediction method for thermal stability of a coordination polymerization organic metal catalyst. The method comprises the following steps: constructing a model of a catalyst active species, an ethylene monomer, a catalyst ligand and a bimolecular ethylene coordinated complex, carrying out geometric structure optimization and frequency analysis to obtain a thermodynamically stable 3D structure, and collecting and sorting corresponding stable molecular structures and thermodynamic correction values of enthalpy values and Gibbs free energy of the stable molecular structures; obtaining corresponding single-point energy, enthalpy value and Gibbs free energy of each molecular structure, bond dissociation enthalpy and bond dissociation energy; quantum chemical descriptors are calculated; combining the quantum chemical descriptors, the key dissociation enthalpy and the key dissociation energy to construct a database; and adopting multiple linear stepwise regression analysis to remove multiple collinearity of the descriptors, and constructing a prediction model. According to the prediction method provided by the invention, the thermal stability of the coordination polymerization organic metal catalyst can be accurately predicted, so that the workload is reduced, and efficient screening of the polymerization catalyst is realized.

The invention provides a method for constructing a Hu sheep lamb weaning weight prediction model, which comprises the following steps of: weighing and recording lamb birth weight when a set number of to-be-delivered Hu sheep ewes lamb, recording the number of lambs with the same birth and lamb sex, weighing and recording lamb weaning weight at the weaning day age of the lambs, and recording the lamb weaning weight at the weaning day age of the lambs; acquiring a data set including lamb birth weight, the number of lambs in the same fetus, lamb gender and lamb weaning weight, and dividing the data set into a training set and a verification set; performing multivariate stepwise regression analysis on the training set, establishing a prediction model of the weaning weight of the male lambs and the weaning weight of the female lambs, and checking the prediction model by using a root-mean-square error, a variable coefficient and a decision coefficient; and substituting the verification set into the prediction model, performing correlation analysis on a prediction result and an actual measurement result, and verifying the accuracy of the prediction model. According to the method, the construction process is relatively simple, the constructed prediction model is relatively high in reliability, and the weaning weight of the Hu sheep lambs can be accurately predicted according to the birth weight and the number of lambs of the same birth.

This invention provides a method for calculating the content of micro-components in coal seams, comprising the following steps: Step S1, measuring the content of micro-components, ash content (Aad), and total sulfur content (St) of the coal core; Step S2, obtaining the well logging curve values ​​for the depth segment of the coal seam where the coal core is located; Step S3, selecting sensitive well logging curves reflecting the micro-components of the coal core through mathematical statistical analysis of the correlation between the micro-component content of the coal core and the sensitive well logging curves; Step S4, performing multivariate stepwise regression analysis on the micro-component content of the coal core and the sensitive well logging curves respectively to obtain the relationship between the micro-component content of the coal core and the sensitive well logging curves; Step S5, obtaining the well logging curve values ​​corresponding to the coal seam segment for which the micro-component content of the coal core to be measured is obtained, and substituting the well logging curve values ​​into the relationship to obtain the micro-component content of that coal seam segment. The technical solution of this invention can quickly and accurately predict the content of micro-components, providing a basis for development deployment and decision-making, and reducing development risks.

The invention belongs to the technical field of plant drought resistance identification, and discloses a method for identifying the drought resistance of corn varieties based on comprehensive weights. According to the method, the yield, the water utilization efficiency and a plurality of physiological and biochemical indexes in the corn growth period are combined, through a membership function method, principal component analysis and D value synthesis, the drought resistance of different varieties of corn under film mulching and non-film mulching treatment is systematically evaluated, and a drought-resistant high-yield and high-efficiency prediction model is further established through stepwise regression analysis; and a basis is provided for later large-scale variety screening. The regression equation of the model for predicting the drought resistance, high yield and high efficiency of the corn is as follows: YWD =-2.878 + 0.120 DIX1 + 0.096 DIX2 + 0.278 DIX3 + 0.897 DIX4 + 0.713 DIX6 + 0.570 DIX7 + 0.127 DIX14 + 1.196 DIX16 + 0.141 DIX18, R2 is 0.97, and the fitting effect is better.