[R] Get Data Table from iml FeatureEffect Object

[Bert Gunter]

that is, read ?str carefully.

data structures are fundamental to any programming language, so if you
really aren't getting it, that's a signal that you need to spend some time
with R tutorials. The R language Definition manual is a more comprehensive
but of course more difficult resource to learn about such matters. I find
it readable, however. Others may not.

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Tue, Mar 17, 2020 at 12:22 PM Bert Gunter <bgunter.4567 using gmail.com> wrote:

> ?str
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along and
> sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
>
> On Tue, Mar 17, 2020 at 12:19 PM Sparks, John <jspark4 using uic.edu> wrote:
>
>> Hi R-Helpers,
>>
>> I have recently started working with the iml package (Interpretable
>> Machine Learning)  and its associated material, which I generally find very
>> helpful.
>>
>> I want to recover some values out of the FeatureEffect Object created by
>> this library, but the form of the object is completely foreign to me.
>>
>> As a reproducible example:
>>
>>
>> set.seed(42)​
>> library("iml")​
>> library("randomForest")​
>> data("Boston", package  = "MASS")​
>> rf = randomForest(medv ~ ., data = Boston, ntree = 50)​
>> ​
>> X = Boston[which(names(Boston) != "medv")]​
>> predictor = Predictor$new(rf, data = X, y = Boston$medv)​
>> imp = FeatureImp$new(predictor, loss = "mae")​
>> eff = FeatureEffect$new(predictor, feature = "rm") ​
>> eff
>>
>>
>> Interpretation method:  FeatureEffect
>> features: rm[numerical]
>> grid size: 20
>>
>> Analysed predictor:
>> Prediction task: unknown
>>
>>
>> Analysed data:
>> Sampling from data.frame with 506 rows and 13 columns.
>>
>> Head of results:
>>        .ale .type    rm
>> 1 -2.150574   ale 3.561
>> 2 -2.610528   ale 5.304
>> 3 -2.338677   ale 5.593
>> 4 -2.265673   ale 5.709
>> 5 -2.142912   ale 5.837
>> 6 -2.085899   ale 5.885
>>
>> How can I refer to and get ahold of the table of 6 records above?
>>
>> I tried str(eff) and class(eff), but I am not familiar with the structure
>> of the object(s).
>>
>> Would someone please tell me how to get inside the eff object, or point
>> me to a reference as to what the class or structure of the object is?
>>
>> Thanks.
>> --John Sparks
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>

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