you are right about the 3rd line but it doesn't help me for my problem. I remove the 3rd line but there is still the same problem:
Error in solve.default (dvcov): the system is numerically unique: reciprocity condition value = 1.63418e-19 Paolo 2018-02-11 16:54 GMT+01:00 Bert Gunter <bgunter.4...@gmail.com>: > Note the typo in your 3rd line: data < > > Don't know if this means anything... > > Bert > > > > On Feb 11, 2018 7:33 AM, "PAOLO PILI" <paolo.p...@student.unife.it> wrote: > >> Hello, >> >> I have a problem with Hausman test. I am performing my analysis with these >> commands: >> >> > library(plm) >> > data<-read.csv2("paolo.csv",header=TRUE) >> > data< >> pdata.frame(data,index=c("FIRM","YEAR"),drop.index=TRUE,row.names=TRUE) >> > >> RECEIV~LSIZE+LAGE+LAGE2+CFLOW+STLEV+FCOST+PGROWTH+NGROWTH+TU >> RN+GPROF+GPROF2 >> > >> grun.fe<-plm(RECEIV~LSIZE+LAGE+LAGE2+CFLOW+STLEV+FCOST+PGROW >> TH+NGROWTH+TURN+GPROF+GPROF2,data=data,model="within") >> > grun.re >> <-plm(RECEIV~LSIZE+LAGE+LAGE2+CFLOW+STLEV+FCOST+PGROWTH+NGRO >> WTH+TURN+GPROF+GPROF2,data=data,model="random") >> > >> gw<-plm(RECEIV~LSIZE+LAGE+LAGE2+CFLOW+STLEV+FCOST+PGROWTH+ >> NGROWTH+TURN+GPROF+GPROF2,data=data,model="within") >> > >> gr<-plm(RECEIV~LSIZE+LAGE+LAGE2+CFLOW+STLEV+FCOST+PGROWTH+ >> NGROWTH+TURN+GPROF+GPROF2,data=data,model="random") >> > phtest(gw,gr) >> >> I got this answer: >> >> Error in solve.default(dvcov) : >> >> how can I solve this problem? >> >> Thank you >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posti >> ng-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.