Test method

Original hypothesis

Statistical magnitude

P value

F test

H0: The intercept terms of different individuals are the same (mixed regression model)

45.75

0.0000

Hausman test

H0: Individual effect has nothing to do with regression variable (random effect regression model)

original: 52.73

sigma more: 109.77 (0.0000)

sigma less: 78.76 (0.0000)