Hello,
I am trying to conduct a Hausman test to choose between FE estimators and RE
estimators.
When I try to run:
library(plm)
fixed <- plm(ROS ~ DiffClosenessC +ZZiele + AggSK + nRedundantStrecken +
Degree + KantenGew + BetweennessC + SitzKappazitaet,
data=Panel,index=c("id","time"),model="within")
summary(fixed)
fixef(fixed)
random <-plm(ROS ~ DiffClosenessC +ZZiele + AggSK + nRedundantStrecken +
Degree + KantenGew + BetweennessC + SitzKappazitaet,
data=Panel,index=c("id","time"), model="random")
summary(random)
phtest(fixed, random)
I get an error from phtest(fixed, random)
Fehler in solve.default(dvcov) :
System ist f?r den Rechner singul?r: reziproke Konditionszahl = ...
Error in solve.default(dvcov) :
system is computationally singular: reciprocal condition number =...
Can someone Help me with this problem or give me a hint where to look?
Thanks
gloria
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