Here are the solutions from the 3 models: '1 as reference '; Solutions for Fixed Effects Standard Effect out Estimate Error DF t Value Pr > |t| Intercept 2 -2.5473 1.2101 200 -2.11 0.0365 Intercept 3 0.3947 0.9824 200 0.40 0.6883 lnlab 2 0.4435 0.1562 278 2.84 0.0049 lnlab 3 0.1751 0.1286 278 1.36 0.1744 '2 as reference' Solutions for Fixed Effects Standard Effect out Estimate Error DF t Value Pr > |t| Intercept 1 2.8082 1.3076 200 2.15 0.0330 Intercept 3 3.8814 0.9604 200 4.04 <.0001 lnlab 1 -0.4670 0.1665 278 -2.80 0.0054 lnlab 3 -0.3887 0.1202 278 -3.23 0.0014 '3 as reference'; Standard Effect out Estimate Error DF t Value Pr > |t| Intercept 1 -1.3388 1.1632 200 -1.15 0.2512 Intercept 2 -3.4725 0.9893 200 -3.51 0.0006 lnlab 1 -0.04545 0.1497 278 -0.30 0.7616 lnlab 2 0.3355 0.1244 278 2.70 0.0074 Regarding the objective function, the number of iterations is different for each model (14, 10, and 11). The starting point and end point for the objective function are different for each model. Regina
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