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Questions - trend

R GAM producing different results via group argument

I have some hourly data over 24 hrs across a year, by 7 groups. When I fit a gam (mgcv::gam) I use the by= argument to produce 7 different fitted lines - it produces some odd looking fits. However whe...
test-img

Sam

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model

gam

trend

Votes: 0

Answers: 1

Latest Answer

From the documentation for the s function in mgcv: In the factor by variable case a replicate of the smooth is produced for each factor level (these smooths will be centered, so the factor usually ne...
test-img

ulfelder

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