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Questions - gam

Gratia package: probability instead of log odds for plotting generalized additive model (GAM)

I was trying to plot a logistic GAM model using the gratia package (since it uses ggplot2), however I would like the effects (or partial effects) to be plotted in terms of probabilities instead of log...
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yentl02

ggplot2

plot

gam

Votes: 0

Answers: 1

Latest Answer

You'll have to add the model constant term and transform by the inverse of the link function: draw(gam_fit, constant = coef(gam_fit)[1], fun = inv_link(gam_fit)) (and I'm not sure if constant or fun ...
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Gavin Simpson

When using GAM in R, why is the plot for two continuos variables different from the first one plotted with two continuos by categorical?

I'm using GAM in R and I can't understand why the output for two different equations that should give the same plot are not exactly the same. For example, when using the mpg dataset with a multivariat...
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Adriana Velasquez

r

statistics

gam

Votes: 0

Answers: 1

Latest Answer

The main problem with your model is that you forgot to include the group means for the levels of fuel. As a result, the smooths, which are centred about the overall mean of the response are having to ...
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Gavin Simpson

Using GAM for the first time on species detection data

I am running a GAM on species detection data for the first time. I would like to see if there is any interaction between time of year and diel period for both male and female of this species. This is ...
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orangepeelsoup

r

gam

mgcv

Votes: 0

Answers: 0

How to get the names of factor levels corresponding to fixed effect regression coefficients for a GAM in R?

I have a gam in R (mgcv package) with 7 parameters, and one of them is a fixed effect with 30 levels (30 names). I want to analyse the regression coefficients for each name (person), but R numbers eac...
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leslie roberson

r

regression

gam

coefficients

mgcv

Votes: 0

Answers: 1

Latest Answer

Figured it out - the factor variables have to be wrapped in factor() within the GAM call. I had converted all the factor variables from characters to factors before running the gam, but for some reaso...
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leslie roberson

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