R language performs double sample t-test on multiple covariates based on lapply function, Welch double sample t-test analysis and double independent sample t-test on the mean of covariates correspondi

R Language based lapply The function performs two samples on multiple covariates t test 、t.test Function to calculate the mean value of covariates corresponding to different groups Welch Double sample t Test analysis 、 Double independent samples t test

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