Thank you soooo, sooo much, I think I found the mistake. There really is a lot of data missing.      When I checked the data again, I found that every person has 10 lines, like this:     I assume thats where the error comes from, because very person should just have one line, right?   I got this data from my tutor. Any tips how I can just 'delete' the other lines? ... View more

All the variables in the code are also in the work.allerk data file. And they all have a value. That's why I'm so clueless about what to do. ... View more

Thank you, this is the complete log:  75 76 DATA WORK.ALLERK ; 77 SET WORK.ALLERK ; 78 NOTE: There were 2280 observations read from the data set WORK.ALLERK. NOTE: The data set WORK.ALLERK has 2280 observations and 110 variables. NOTE: DATA statement used (Total process time): real time 0.01 seconds cpu time 0.01 seconds 79 PROC GLM; 80 CLASS RKSchu ; 81 MODEL RKSchu = RK1 RK3 RK4 RK5 RK6 RK7 RK8 RK9 RK11 RK12 RK13 RK17; 82 83 84 85 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK; ERROR: One or more variables are missing or freq or weight is zero on every observation. 98 ... View more

Thank you for your input, Reza. What would be my alternative? I'm sorry for the question, but statistics is not my strength... ... View more

Thank you for your reply.    I changed the code to: DATA WORK.ALLERK ; SET WORK.ALLERK ; PROC GLM; CLASS RKSchu ; MODEL RKSchu = RK1 RK3 RK4 RK5 RK6 RK7 RK8 RK9 RK11 RK12 RK13 RK17;   I still get the same Error Report.    Where should my variables be missing? They are in the file WORK.ALLERK.   I'm sorry if I can't explain myself very clearly, English isn't my first language... ... View more