plm_1.2-4 effect="individual"
运行上确有问题.
若要用effect="individual"
可能需要用旧版plm_1.2-3(2010-01-26)
default effect="individual"
default model= "onestep"
library(plm)
data("EmplUK", package="plm")
z3 <- pgmm(dynformula(log(emp) ~ log(wage) + log(capital), list(1,1,1)),
data = EmplUK, gmm.inst = ~log(emp) + log(wage) + log(capital),
lag.gmm = c(2,99),transformation="ld")
summary(z3,robust=TRUE)
Oneway (individual) effect One step model
Call:
pgmm(formula = dynformula(log(emp) ~ log(wage) + log(capital),
list(1, 1, 1)), data = EmplUK, gmm.inst = ~log(emp) + log(wage) +
log(capital), lag.gmm = c(2, 99), transformation = "ld")
Unbalanced Panel: n=140, T=7-9, N=1031
Number of Observations Used: 891
Residuals
Min. 1st Qu. Median Mean 3rd Qu. Max.
-6.316e-01 -6.198e-02 9.364e-03 -7.981e-13 7.147e-02 4.758e-01
Coefficients
Estimate Std. Error z-value Pr(>|z|)
lag(log(emp), 1) 0.883494 0.036301 24.3377 < 2.2e-16 ***
log(wage) -0.635696 0.096017 -6.6206 3.577e-11 ***
lag(log(wage), 1) 0.440633 0.103483 4.2580 2.063e-05 ***
log(capital) 0.544610 0.048634 11.1980 < 2.2e-16 ***
lag(log(capital), 1) -0.461547 0.048335 -9.5489 < 2.2e-16 ***
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Sargan Test: chisq(101) = 242.1626 (p.value=1.3157e-13)
Autocorrelation test (1): normal = -5.165081 (p.value=1.2017e-07)
Autocorrelation test (2): normal = -0.5923206 (p.value=0.27682)
Wald test for coefficients: chisq(6) = 30595.98 (p.value=< 2.22e-16)
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