pydata/patsy

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Describing statistical models in Python using symbolic formulas

Stars: 990
Forks: 106
Open beginner issues: 0
Indexed issues: 67
Avg merge: 7d 34m
Merged PRs (30d): 1

Dominant language: Python
License: No license data
Last GitHub push: Sep 7, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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67 open issues indexed

VarLookupDict should implement __iter__, causes CPython crash when using statsmodels in marimo notebook Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

pydata/patsy#259 · Opened May 30, 2026
`build._eval_factor` error condition attempts to access attribute `dtype` on `DataFrame` object, but no such attribute exists Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

pydata/patsy#232 · 2 comments · Opened Aug 7, 2025
Accept to use variable and categorical variable from dataframe index Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#211 · 1 comment · Opened Oct 9, 2024
Standardize(x) comes before drop na Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/patsy#208 · Opened May 28, 2024
0.5.3: pytest is failing in some units Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/patsy#194 · 11 comments · Opened May 20, 2023
0.5.3: documentation build fails with sphinx 6.2.1 Open

wontfix

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

pydata/patsy#193 · 1 comment · Opened May 20, 2023
Add link to license in readme Open

Difficulty 1/5 Under an hour Newbie friendliness 72/100

pydata/patsy#189 · Opened Jan 15, 2023
Does python have an analogue to R's splines::ns() Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#183 · Opened Mar 28, 2022
Wrote a convenience function for getting variable names from formula Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#171 · 1 comment · Opened May 15, 2021
When passing DataFrame, dmatrices returns design matrix with zero rows using standardize in formula Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/patsy#166 · Opened Jan 10, 2021
Is there a way to get dmatrix to drop all-zero columns? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#161 · 1 comment · Opened Aug 30, 2020
"+ -1" equivalence with "-1" in patsy formula? Open

bug fixed in formulaic

pydata/patsy#158 · 2 comments · 1 assignee · Opened Jul 20, 2020
Introducing `formulaic`, a high-performance `patsy` "competitor" Open

Difficulty 5/5 Over a week Newbie friendliness 12/100

pydata/patsy#157 · 2 comments · 2 reactions · Opened Jul 6, 2020
patsy equivalent of R's all.vars Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/patsy#155 · 1 comment · Opened May 18, 2020
How to construct a polynomial for numerical data? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#152 · Opened Sep 15, 2019
Minor (in?)consistency in terms naming with Treatment scheme Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/patsy#151 · Opened Aug 28, 2019
I get a blank assertion error as well Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/patsy#150 · Opened Jun 12, 2019
Deferring Evaluation of Terms Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#149 · 2 comments · Opened Jun 12, 2019
dmatrices raising “AssertionError” Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/patsy#148 · 3 comments · Opened Jun 12, 2019
formula support for categorical endog variable in logistic regression Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#146 · 1 comment · Opened May 16, 2019
Faillure in spline-regression.rst due to "print" with Python 3 Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

pydata/patsy#143 · Opened Feb 13, 2019
Builtins for numpy recarrays Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

pydata/patsy#142 · 4 comments · 1 reaction · Opened Feb 4, 2019
Update "Differences between R and Patsy Formulas" to state that dot on RHS is not supported Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

pydata/patsy#134 · 1 comment · 1 reaction · Opened Oct 22, 2018
ENH: option for nonreplicated exterior knots in b-splines Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#132 · 2 comments · Opened Oct 12, 2018
How to get Pandas DataFrame with column descriptions? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#127 · Opened Jul 18, 2018
Forecasting incrementally with patsy Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/patsy#126 · 1 comment · Opened Jun 14, 2018
Patsy loses DatetimeIndex freq information even if no NA values Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

pydata/patsy#125 · Opened Jun 1, 2018
Question: Programmatically creating splines and applying knots to new data Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/patsy#121 · 1 comment · Opened Mar 9, 2018
Function "C" in current environment overrides categorical operator Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/patsy#120 · 1 comment · Opened Feb 25, 2018
Categorical encodings, entropic approach Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#119 · 5 comments · Opened Jan 26, 2018
inf treated as a number, which is very weird Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/patsy#118 · Opened Jan 22, 2018
Pickle Support Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/patsy#114 · 1 comment · Opened Dec 18, 2017
copy.deepcopy strips off .design_info from DesignMatrix Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/patsy#112 · Opened Nov 1, 2017
Adding tutorial resources Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/patsy#111 · Opened Sep 30, 2017
Better handling for unrecognized categorical levels? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#110 · 4 comments · 1 reaction · Opened Jul 15, 2017
Lagged variables in formula Open

fixed in formulaic

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/patsy#105 · 1 comment · 2 reactions · Opened May 4, 2017
joblib.parallel with patsy? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#103 · 2 comments · Opened Mar 6, 2017
Backticks `x` as an alias for Q('x') Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/patsy#100 · 5 comments · Opened Jan 12, 2017
patsy questions/wishlist Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/patsy#93 · 4 comments · Opened Sep 16, 2016
Time to drop support for pandas < 0.9? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/patsy#88 · Opened Jun 5, 2016
Add "numerical" function (opposite of C() in formulas)? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/patsy#87 · Opened May 8, 2016
Standardize transform should handle edge case where variable has zero variance Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

pydata/patsy#85 · Opened Apr 22, 2016
Transforms like 'scale' need some way to handle missing data Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/patsy#82 · 3 comments · Opened Apr 6, 2016
Is this the expected behavior of patsy when building a design matrix of a two-level categorical variable without an intercept? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/patsy#80 · 12 comments · 3 reactions · Opened Mar 11, 2016
How to use mutli-column functions in Patsy which return categorical output? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/patsy#79 · 2 comments · Opened Mar 6, 2016
coding categorical response variables for use with scikit-learn Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/patsy#77 · 10 comments · Opened Nov 11, 2015
subset columns of a design matrix Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/patsy#72 · Opened Aug 18, 2015
Add "partial prediction" (initially at the factor level) Open

statsmodels-request well-defined-task-definitely-do-this

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/patsy#64 · 2 comments · Opened Apr 14, 2015
Implement an option for factor-based prediction Open

statsmodels-request well-defined-task-definitely-do-this

Difficulty 5/5 Over a week Newbie friendliness 30/100

pydata/patsy#63 · 1 comment · Opened Apr 14, 2015
Need a way to request the LHS of a formula to *not* go through design matrix processing Open

statsmodels-request

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/patsy#62 · 1 comment · Opened Apr 14, 2015

pydata/patsy

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