I have the following object M, from which I need to extract the fstatistic. It is a model generated by the function summaryC of a model generated by aovp, both functions from package lmPerm. I have tried hints for extracting values from normal linear models and from the functions in attr, extract and getElement, but without success.
Anybody could give me a hint?
> str(M)
List of 2
$ Error: vegetation: NULL
$ Error: Within :List of 11
..$ NA : NULL
..$ terms :Classes 'terms', 'formula' length 3 Temp ~ depth
.. .. ..- attr(*, "variables")= language list(Temp, depth)
.. .. ..- attr(*, "factors")= int [1:2, 1] 0 1
.. .. .. ..- attr(*, "dimnames")=List of 2
.. .. .. .. ..$ : chr [1:2] "Temp" "depth"
.. .. .. .. ..$ : chr "depth"
.. .. ..- attr(*, "term.labels")= chr "depth"
.. .. ..- attr(*, "order")= int 1
.. .. ..- attr(*, "intercept")= int 1
.. .. ..- attr(*, "response")= int 1
.. .. ..- attr(*, ".Environment")=<environment: R_GlobalEnv>
..$ residuals : Named num [1:498] -46.9 -43.9 -46.9 -38.9 -41.9 ...
.. ..- attr(*, "names")= chr [1:498] "3" "4" "5" "6" ...
..$ coefficients : num [1:4, 1:4] -2.00 -1.00 -1.35e-14 1.00 2.59 ...
.. ..- attr(*, "dimnames")=List of 2
.. .. ..$ : chr [1:4] "depth1" "depth2" "depth3" "depth4"
.. .. ..$ : chr [1:4] "Estimate" "Std. Error" "t value" "Pr(>|t|)"
..$ aliased : Named logi [1:4] FALSE FALSE FALSE FALSE
.. ..- attr(*, "names")= chr [1:4] "depth1" "depth2" "depth3" "depth4"
..$ sigma : num 29
..$ df : int [1:3] 4 494 4
..$ r.squared : num 0.00239
..$ adj.r.squared: num -0.00367
..$ **fstatistic** : Named num [1:3] 0.395 3 494
.. ..- attr(*, "names")= chr [1:3] "value" "numdf" "dendf"
..$ cov.unscaled : num [1:4, 1:4] 0.008 -0.002 -0.002 -0.002 -0.002 ...
.. ..- attr(*, "dimnames")=List of 2
.. .. ..$ : chr [1:4] "depth1" "depth2" "depth3" "depth4"
.. .. ..$ : chr [1:4] "depth1" "depth2" "depth3" "depth4"
..- attr(*, "class")= chr "summary.lmp"
- attr(*, "class")= chr "listof"
there it goes a reproducible example to play with:
Temp=1:100
depth<- rep( c("1","2","3","4","5"), 100)
vegetation=rep( c("1","2"), 50)
df=data.frame(Temp,depth,vegetation)
M=summaryC(aovp(Temp~depth+Error(vegetation),df, perm=""))
as the str output from your example shows, M is a list of two lists, the second one contains what you want. Hence list extraction via [[ does the trick:
> M[[2]][["fstatistic"]]
value numdf dendf
0.3946 3.0000 494.0000
If this is not what you want, please comment.