| bw_ratio | Between/Within Variance Ratio for Time-Invariant Variables |
| fef | Panel Fixed Effects Estimation for Time-Invariant Variables |
| fef_iv | Panel Fixed Effects Estimation for Time-Invariant Variables |
| fevd | Panel Fixed Effects Estimation for Time-Invariant Variables |
| xtfifevd | Panel Fixed Effects Estimation for Time-Invariant Variables |