Fix dof + improve collinearity detection#279
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Main fix: residual dof no longer subtracts the intercept twice — it is now N-K (and G-1 for clustered standard errors), matching Stata. The standard errors themselves were already correct. Also: - Collinearity detection is scale-invariant, so small-scale independent regressors are no longer wrongly dropped. - dof_fes ignores continuous-FE groups (fe(id)&x) whose interaction is all zero. - coeftable labels the confidence-interval columns with the requested level. - partial_out: deprecate method=:gpu and default tol to 1e-6 (so its residuals match reg). - Clearer errors (malformed formulas), new docstrings (fe, has_iv, has_fe, dof_fes, FixedEffectModel, collinear-omitted NaN convention), and small README fixes. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Fix degrees-of-freedom reporting and improve API/docs
Main fix: residual dof no longer subtracts the intercept twice — it is now
N-K (and G-1 for clustered standard errors), matching Stata. The standard
errors themselves were already correct.
Also:
regressors are no longer wrongly dropped.
match reg).
dof_fes, FixedEffectModel, collinear-omitted NaN convention), and small
README fixes.
🤖 Generated with Claude Code