Known 2010-2020 data, predicted 2021-2060 data 1. Logistic prediction of population %%logistic predicts results from 2021 to 2060 clear;clc; X = [7869.34, 8022.99, 8119.81, 8192.44, 8281.09, 8315.11, 8381.47, 8423.50, 8446.19, 8469.09, 8477.26]; n=length(X)-1; for t=1:n Z(t)=(X(t + 1)-X(t))/X(t + 1); end X1=[ones(n,1) X(1:n)’]; Y=Z’; [B,Bint,r,rint,stats]=regress(Y,X1);% least squares (OLS) gamma=B(1,1); beta=B(2,1); b=log(1-gamma); c=beta/(exp(b)-1); a=exp((sum(log(1./X(1:n)-c))-n*(n + 1)*b/2)/n); […]
Tag: pearson
Performance evaluation of refrigeration system based on Pearson correlation similarity analysis (PCSA) and surface temperature-based COP (COPST) refrigerant charging with Matlab code implementation
?About the author: A Matlab simulation developer who loves scientific research. He cultivates his mind and improves his technology simultaneously. For cooperation on MATLAB projects, please send a private message. Personal homepage: Matlab Research Studio Personal credo: Investigate things to gain knowledge. For more complete Matlab code and simulation customization content, click Intelligent optimization algorithm […]
[Infrared Image] Performance evaluation of refrigeration system based on Pearson correlation similarity analysis (PCSA) and surface temperature-based COP (COPST) refrigerant charging with Matlab code
?About the author: A Matlab simulation developer who loves scientific research. He cultivates his mind and improves his technology simultaneously. For cooperation on MATLAB projects, please send a private message. Personal homepage: Matlab Research Studio Personal credo: Investigate things to gain knowledge. For more complete Matlab code and simulation customization content, click Intelligent optimization algorithm […]
Correlation coefficient PEARSON and SPEARMAN
It is used to measure the magnitude of the correlation between two variables. According to different conditions that the data meet, we need to select different correlation coefficients for calculation and analysis Pearson correlation coefficient Overall Pearson correlation coefficient Overall mean:, Overall covariance: Overall Pearson correlation coefficient: Standard Deviation of X: Standard deviation of Y: […]
Scala spark ml correlation matrix interpretation (Pearson/Spearman)
The following is the data of a coffee shop I simulated: Customer Caffeine content (mg) Service time (minutes) Coffee price (yuan) Customer Satisfaction Rating A 80 5 15 8 B 50 4 12 7 C 70 6 14 8 D 90 5 16 9 E 60 4 11 7 F 85 6 18 9 Use […]
[Solved] Spark ML calculates Pearson similarity case
Spark ML calculates the Pearson similarity between two users Function Description Data format and description Design ideas Spark ML calculates Pearson correlation coefficient Code (Scala) Feature Description The program calculates the Pearson correlation matrix between users through the Correlation.corr function in Spark ML according to the ratings of different users on different movies. Data format […]