[R] Get Data Table from iml FeatureEffect Object

Sparks, John
Tue, 17 Mar 2020 19:26:10 -0000

From my previous email:

"I tried str(eff) and class(eff), but I am not familiar with the structure
of the object(s)."

--JJS

________________________________
From: Bert Gunter <bgunter.4567 at gmail.com>
Sent: Tuesday, March 17, 2020 2:22 PM
To: Sparks, John <jspark4 at uic.edu>
Cc: r-help at r-project.org <r-help at r-project.org>; christoph.molnar at
gmail.com <christoph.molnar at gmail.com>
Subject: Re: [R] Get Data Table from iml FeatureEffect Object

?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 at
uic.edu<mailto:jspark4 at 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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