loops - Looping statistic Tests in R -

i apply t test in r within loop

groups  length  size    diet    place   2.4048381   0.7474989   1.6573392   334.3273456   2.72500485  0.86392165  1.8610832   452.5593152   1.396782867 0.533330367 0.8634525   225.5998728 b   1.3888505   0.46478175  0.92406875  189.9576476 b   1.38594795  0.60068945  0.7852585   298.3744962 b   2.53491245  0.95608005  1.5788324   303.9052525 

i tried code loop, not working:

for (i in 2:4){   t.test(table[,c(i)] ~ table$groups, conf.level = 0.95) } 

can me this? thanks!

your code computes 4 t-tests, results lost, because don't them. try following:

info <- read.table(header=true, text="groups  length  size    diet    place                  2.4048381   0.7474989   1.6573392   334.3273456                  2.72500485  0.86392165  1.8610832   452.5593152                  1.396782867 0.533330367 0.8634525   225.5998728                b   1.3888505   0.46478175  0.92406875  189.9576476                b   1.38594795  0.60068945  0.7852585   298.3744962                b   2.53491245  0.95608005  1.5788324   303.9052525")  results <- list() (i in 2:4){     results[[i]] <- t.test(info[,i] ~ info$groups, conf.level = 0.95) }  print(results) 

when interacting repl/console, typing t.test function compute results , return them. console print returned. in scripts source, t.test function return results wil not printed. why put them list , printed list later on.

btw, stored information info not table. r deal great variable names function names, every , hava hard time read error messages, avoid naming variables table or matrix or c or df.