[問題] SAS跑 hausman test的問題
在SAS軟體跑hausman test的時候
結果有出來
但判定是固定模式或隨機模式的兩個值
m Value 及 Pr>m
這兩個值沒出現
而log 給的訊息如下:
NOTE: None of the options FIXONE, FIXTWO, RANONE, RANTWO, FULLER, PARKS,
or DASILVA were
specified. The RANTWO option will be assumed.
NOTE: A negative variance component estimate of -0.07198 was obtained for
cross sections during RanTwo method computations for model statement .
The estimate was set to zero.
NOTE: Hausman statistic can not be computed because the fixed effect
regression does not have
full rank.
請問各位大大
這樣是顯示啥意思呢?
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