what do you do if variables are different between samples which variable is not used as a controlling variable in a regression analysis? what if the dependent variable is not found what is sample 1 and the variable sample 2 when variables are unavailable in a sample what to do if variables are unavailable what to do if variables are not available for a sample why can't we compare the mean and mean of variables why would a sample need to be split what to check for in a data set with unbalanced panel when sample is not comparable, what is the correct choice? what to test in a t test when are all variables available in the sample what is t test for unbalanced panel which variable do you test when you are comparing variables how many variables in a panel sample what to do if the variable differs between samples what type of t test is used to test whether the difference between a sample and a dependent variable when variables are available for all waves, which is better? can you do t testing for dependent variable