I am writing code to run a repeated measures linear mixed model. One of the linear predictors needs a fixed slope set to 1. The other predictor variable and the autocorrelation coefficient are estimated by the model. I have done something similar in PROC REG where there is a RESTRICT statement. Is there an equivalent to RESTRICT in PROC MIXED where I can restrict the slope to a constant? Below is the code: ODS OUTPUT FITSTATISTICS=FIT_RICKER2; ODS OUTPUT CovParms=RICKER_PARMS2; PROC MIXED METHOD=REML ALPHA=.05 NOITPRINT NOINFO DATA=FISH_DENSITY; BY REGION SITE SPECIES; CLASS TIME; MODEL LOG_Nt=LOG_Nt_Minus1 Nt_Minus1/ s outp=pred_RICKER; RANDOM TIME; REPEATED / TYPE=AR(1) SUBJECT=INTERCEPT; ESTIMATE 'INTERCEPT' INTERCEPT 1; RUN;
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