Check linear relationship of logit vs predictors in JASP

quinnculver · May 22

One of the assumptions of logistic regression is

"continuous independent variables, or predictors, have a linear relationship with the log-odds of the predicted probabilities for the outcome" - -https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8710907/

Is there a way to check this in JASP?

The way I'd like to is by plotting the empirical log-odds vs each independent variable. But getting the empirical log-odds as a new column in my data is proving tricky. Here's an example of what I'm trying to do in JASP: https://alexschell.github.io/emplogit.html.

Side question: why isn't this assumption mentioned in Statistical Analysis in JASP: A Guide for Students by Mark A Goss-Sampson?

František · May 23

Hi,

Unfortunately, the JASP does not contain assumption checks yet. I was planning to expand the module after the current release, so this is definitely something we will be looking into.

Cheers,

Frantisek

quinnculver · May 23

Thanks, Frantisek. Any suggestions for manually adding an empirical log-odds column to the data? I found it to be quite tricky.

František · May 28

I'm sorry but I don't have any suggestions in this regard.

TarandeepKang · May 28

Hi František,

Can I ask a bit more about what you're planning in this regard? The box-Tidwell is the first thing that comes to mind, what else were you thinking? I was recently discussing Hosmer-Lemeshow and its cousins with Johnny here: Improvement of assumption checks section in ANOVA procedure · Issue #490 · jasp-stats/jasp-issues (github.com) NB, I didn't start the thread and the title is a bit misleading

For what it's worth, I think the discussion contains too much in one place!

Best,

Tarandeep

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