SAS Community,   I'm trying to run a proc glm to analysis a data set of the following (using SAS Studio 3.6): Dependent variable: temperature (continuous variable) Independent variables: time (continuous variable) treatment (categorical variable with 0-3) length (continuous variable).   The following is the code I was using: proc glm; class time treatment length; model temperature= time length time*length treatment time*treatment length*treatment time*length*treatment; means time length treatment/tukey; run;   The results table for the glm does not display values for the treatment or any of the interaction variables: --(I know that the final treatment in the interaction of time*treatment*length is spelled wrong, it's spelled correctly in the code. There are no other spelling issues in the coding)   One last issue: I have some data points that don't have a length value but have all the other variables and I'm not sure how to leave that variable blank and still have SAS read the code correctly for the other data points.   Any help would be greatly appreciated,   Cheers. ... View more