Hi all,
I want to use the estimation method fixed effect on my panel data.
I have found plm function but it give me a problem,my model is:
1/5*log(z_{i,t}/r_{i,t})=a+b*r_{i,t}+u_{i,t} , I have 9 individuals and 5
time for each
individuals so I have 45 observation

this is what I do:

> p <- c("italia","italia","italia","italia","italia","spagna", .....)
> t  <- c(1980,1985,1990,1995,2000,1980, .....)
> y <- 1/5*log(z/r)
> x <- log(r)
> X <-cbind(p,t,y,x)
> X <- data.frame(X)
> ooo <- plm.data(X)
> ooo
            p        t                    y                            x
41    austria 1980   0.0346493597549657 0.179025476619000
42    austria 1985   0.0287375757505195 0.352272275393828
.
.
.
.
> vedo<-plm(y~x,data=ooo)
Errore in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) :
  0 (non-NA) cases
Inoltre: Warning messages:
1: In model.response(mf, "numeric") :
  using type="numeric" with a factor response will be ignored
2: In Ops.factor(y, y.m) : - not meaningful for factors


I do also in other way:
> Z <-cbind(p,t,z,r)
> Z <-data.frame(Z)
> zz<-plm.data(Z)
> zz
            p       t               z                           r
41    austria 1980 1.42229572713245 1.19605121512085
42    austria 1985 1.64207412666992 1.42229572713245
.
.
.
> xxx<-plm(1/5*log(z/r)~log(r),data=zz)
Errore in Math.factor(c(1L, 5L, 9L, 14L, 17L, 25L, 26L, 27L, 32L, 38L,  :
  log not meaningful for factors
Inoltre: Warning message:
In Ops.factor(y1, x1) : / not meaningful for factors


what I can do?
thanks in advance

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