Don't know what it happening, but when I compared the output of 'str(tmp.aov)'
before and after the 'source', I saw at least the following differences:

before:
 $ terms        :Classes 'terms', 'formula' length 3 y ~ a
  .. ..- attr(*, "variables")= language list(y, a)
  .. ..- attr(*, "factors")= int [1:2, 1] 0 1
  .. .. ..- attr(*, "dimnames")=List of 2
  .. .. .. ..$ : chr [1:2] "y" "a"
  .. .. .. ..$ : chr "a"
  .. ..- attr(*, "term.labels")= chr "a"
  .. ..- attr(*, "order")= int 1
  .. ..- attr(*, "intercept")= int 1
  .. ..- attr(*, "response")= int 1
  .. ..- attr(*, ".Environment")=<R_GlobalEnv>
  .. ..- attr(*, "predvars")= language list(y, a)
  .. ..- attr(*, "dataClasses")= Named chr [1:2] "numeric" "factor"
  .. .. ..- attr(*, "names")= chr [1:2] "y" "a"

after:
 $ terms        : language y ~ a


So it would seem some of the attributes are not being saved.

You might want to use 'save' instead.  Here is the output:

> tmp <- data.frame(y=rnorm(12), a=factor(rep(letters[1:4],3)))
> tmp
             y a
1   0.61982575 a
2  -0.05612874 b
3  -0.15579551 c
4  -1.47075238 d
5  -0.47815006 a
6   0.41794156 b
7   1.35867955 c
8  -0.10278773 d
9   0.38767161 a
10 -0.05380504 b
11 -1.37705956 c
12 -0.41499456 d
> tmp.aov <- aov(y ~ a, data=tmp)
> summary(tmp.aov)
            Df Sum Sq Mean Sq F value Pr(>F)
a            3 1.3068  0.4356   0.622 0.6204
Residuals    8 5.6031  0.7004
> save(tmp.aov, file="dumpdata.R")
> rm(tmp.aov)
> load("dumpdata.R")
> ls()

> summary(tmp.aov)
            Df Sum Sq Mean Sq F value Pr(>F)
a            3 1.3068  0.4356   0.622 0.6204
Residuals    8 5.6031  0.7004
>



On 5/28/07, Richard M. Heiberger <rmh@temple.edu> wrote:
>
> > tmp <- data.frame(y=rnorm(12), a=factor(rep(letters[1:4],3)))
> > tmp
>             y a
> 1  -0.60866099 a
> 2   0.55500538 b
> 3   0.12231693 c
> 4  -0.24613790 d
> 5  -0.09253593 a
> 6  -1.54652581 b
> 7   0.17204210 c
> 8  -1.22778942 d
> 9   1.22151194 a
> 10 -0.43982577 b
> 11 -1.25444287 c
> 12 -0.97251060 d
> > tmp.aov <- aov(y ~ a, data=tmp)
> > summary(tmp.aov)
>            Df Sum Sq Mean Sq F value Pr(>F)
> a            3 1.5220  0.5073  0.6973 0.5794
> Residuals    8 5.8209  0.7276
> > dump("tmp.aov")
> > rm(tmp.aov)
> > source("dumpdata.R")
> > ls()
> [1] "tmp"     "tmp.aov"
> > summary(tmp.aov)
>            Df Sum Sq Mean Sq F value Pr(>F)
> NA           3 1.5220  0.5073  0.6973 0.5794
> Residuals    8 5.8209  0.7276
> >
>
>
> The factor name in the summary() after dumping and sourcing the
> aov object is missing.
>
>
> > version
>               _
> platform       i386-pc-mingw32
> arch           i386
> os             mingw32
> system         i386, mingw32
> status
> major          2
> minor          5.0
> year           2007
> month          04
> day            23
> svn rev        41293
> language       R
> version.string R version 2.5.0 (2007-04-23)
> >
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> 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.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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