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Hi, I have a file in wide format (twins data) and i want to analysis in long format. I use: data widetolong: wide = x1 x2  y1 y2  z1 z2; long = x  y  z; idvariable = fam; repetition = pid; variable: names = x1 x2 y1 y2 z1 z2 fam; usevariable = x y z; I want to compute the interaction k=x*z. I try define: k1=x1*z1; k2=x2*z2; And i recive the error message that k1 and k2 don't exist. I add k1 and k2 in the wide statement and k in the wide statement. I recive the same error message. I add k1, k2 and k in the usevariable statement. The model was estimated but it also compute means and variance for k1 and k2. I realy confuse... the analysis was in the long format but k1 and k2 was in wide format. I probably doing something wrong How can i compute the interaction ? Thanks Alain Girard 


Try the following: data widetolong: wide = x1 x2  y1 y2  z1 z2  k1 k2; long = x  y  z  k; idvariable = fam; repetition = pid; variable: names = x1 x2 y1 y2 z1 z2 fam; usevariable = k1 k2 x y z k; Auxiliary = k1 k2; define: k1=x1*z1; k2=x2*z2; 


Hi there, I'm trying to do a repeated measures model that is not twolevel like in example 9.16, but rather it's crossed. Meaning, I have six time points for each person (time), but those time points consist of fall and spring measures. I want to add spring (set at 1 or 0 for each time point) as one of the fixed effects in my model. I also want to include an interaction for time and spring in the model. Can you tell me how to set up the code for this?? DATA WIDETOLONG: WIDE = y1y6 spring1spring6; LONG = y  spring; IDVARIABLE = person; REPETITION = time spring; VARIABLE: NAMES ARE y1y6 spring1spring6; USEVARIABLE = y spring person time; CLUSTER = person; WITHIN = time spring; MODEL: ????? 


I don't see why this would be a crossed situation. 


Well because we believe there is a withinyear effect as well as across all years. We want to capture the variation that occurs between fall and spring each year as well as the year to year variation, and the interaction between the two. 


Something like that could work model: i s  y1@0 y2@1 y3@2 y4@3 y5@4 y6@5; spring by y1@1 y3@1 y5@1; Take a look at User's Guide Chapter 6 for more ideas. 

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