tidymodels / tidymodels/multilevelmod
Tighten checks in `id_var()` column for GEE
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feature
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Description
library(multilevelmod)
#> Loading required package: parsnip
df <- data.frame(
y = rnorm(20),
x = rnorm(20),
group1 = rep(1:4, each = 5),
group2 = rep(1:5, times = 4)
)
# we require a single id column
fit <- gee_fit(y ~ x + id_var(group1) + id_var(group2), data = df)
#> Error in `gee_formula()`:
#> ! There should be a single id column specified using the `id_vars()`
#> function.
#> ℹ For example: `y ~ x + id_vars(id_col)`
# but this slips through the checks
fit <- gee_fit(y ~ x + id_var(group1 + group2), data = df)
#> Error in .subset2(x, i, exact = exact): subscript out of bounds
Created on 2026-01-13 with reprex v2.1.1
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing the gee_fit() call into gee_formula() and the validation of id_var() expressions. Reproduce both formulas from the issue, then make sure a combined expression such as id_var(group1 + group2) is rejected with the intended single-id-column error instead of a subscript failure.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- r
- Domain
- data
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100