Example 19.3 The Airline Cost Data: Further Analysis

Using the same data as in Example 19.2, you further investigate the 'true' effect of fuel prices. Specifically, you run the FixOne model, ignoring time effects. You specify the following statements in PROC PANEL to run this model:

   proc panel data=airline;
     id i t;
     model lC = lQ lPF LF / fixone;
   run;

The preceding statements result in Output 19.3.1. The fit seems to have deteriorated somewhat. The SSE rises from 0.1768 to 0.2926.