Hi, I want to see if there is a carry-over effect in my study and I don't know how do I do so in SAS. Basically, I have three timepoints (baseline, time1, time2). All subject received diet A from baseline to time1, and then they all received diet B from time1 to time2. The study outcome is energy expenditure. There was no washout period in between. I wonder how may I analyze the data to investigate if energy expenditure from time1 to time2 is affected/carried over by diet A? Attached is my sample data. TEE_change  is the outcome. Period=ru is from baseline to time1, Period=TD is from time1 to time2. I want to see if tee_change during period=TD is affected by diet=VLC. Thank you so much in advance!    Thanks, ... View more