T-test for grouped data in R commander -
 i've following data format  entity measure1 measure2 a1 1.5 1.4 a1 1.9 1.7 a1 1.8 1.5 b1 2.7 2.5 b1 3.0 2.9 b1 3.1 2.7 b1 2.8 2.9 c1 1.7 1.5 c1 1.7 1.8 ...  i wish pairwise t-test entity  factor , @ measure1  , measure2  levels. can in r there way in r commander gui? in r commander paired t-test considers values of measure1  , measure2  columns , doesn't perform t-test groupwise. 'independent sample t-test' option grayed out too.     if abandoned paired-t.test formalism regression:   lm( measure2 ~ measure1 + entity, data=dfrm)  this give estimate of mean increase in measure2 (from measure 1) group. thats eally paired t-tests doing, anyway.