[R] logistic regression based on principle component analysis

Dear all: I try to analyse a dataset which contain one binary response variable and serveral predict variables, but multiple colinear problem exists in my dataset, some paper suggest that logistic regression for principle components is suit for these noise data, but i only find R can done prin

[R] how to merge list of dataframes?

Dear all: I have a list of dataframes like this, i try to merge this lists of dataframes into one single dataframe, and keep ther column names as usual, how can i do this? i try lapply(aa,rbind), but it dose not work. Best regard! > summary(aa) Length Class Mode [1,] 3 dat