Using for loop for statistics by data frame column in R. -

i have been trying make loop takes vector of column names want use , loop statistical tests column determines group of sample. here how looks now.

sink('df_statistics.txt')  df <- `df.tsv`  columns <- c("column1" , "column2" , "column3" , "column4")  (x in columns) {     wilcox.test(formula = x ~ group, data = df) }  sink() 

when run error:

error in model.frame.default(formula = data ~ group, data = df) :    variable lengths differ (found 'group') 

my groups determined numbers 1 , 2, tried naming them control , experimental keep getting same error above. suggestions?

thank you

we can use lapply

lapply(df[columns], function(x) wilcox.test(x~df$group)) 

data

columns <- c("column1" , "column2") set.seed(24) df <- data.frame(group = rep(1:2, each=5), column1 = rnorm(10), column2 = rnorm(10))