QQ plots in Arviz

Questions
1

Does Arviz provide an equivalent to the ppc_loo_pit_qq function in Bayesplot? Does it provide any kind of qq-plot capability for plotting observations against the posterior predictive at all?

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2

Per the docs, this might serve your purpose: arviz.plot_loo_pit — ArviZ dev documentation

EDIT, ah, you’re after a QQ plot in particular… I imagine this isn’t too hard to create

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3

Hi Jon – I’m aware of the plot_loo_pit function, but I don’t see any. I’m interested in whether Arviz has any way to draw qq-plots, or whether I have to use a function from another package or build one myself.

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4

I haven’t looked properly at the Arviz code before, but in my unqualified opinion it looks pretty good. Should be reasonably straightforward to create a new partner function to arviz/plots/loopitplot.py and I bet it would be well received as a contribution!

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5

It would definitely be well received, and it should not require many changes as it’s mostly skipping some steps in the loo-pit ECDF diff plot which is already implemented.

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6

I figured most of the required infra would be there :slight_smile: I should have time to breathe in a couple of weeks so will try then if no one else wants to

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