diptest

library0.11.0pypypi✓ verified 85d ago

Python implementation of Hartigan's dip test for unimodality. Current version 0.11.0 (January 2025). Fast O(n log n) implementation. Pre-compiled wheels for major platforms. Releases are stable but infrequent.

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pip install diptest

github ↗homepage ↗

INSTALL

IMPORT

SIG · DIPTEST

diptest

analyticspythonv0.11.0

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

dipstat

✓ from diptest import dipstat

✗ import diptest.dipstat

dipstat is a function, not a submodule.

dip_pval

✓ from diptest import dip_pval

✗ from diptest.diptest import dip_pval

Direct import from diptest package.

Compute Hartigan's dip statistic and p-value for unimodality on a sample.

import numpy as np from diptest import dipstat, dip_pval np.random.seed(42) data = np.random.normal(0, 1, 200) dip, pval = dipstat(data), dip_pval(dip, len(data)) print(f'Dip statistic: {dip}, p-value: {pval}')

Debug

Known issues

gotchadip_pval expects the dip statistic and sample size, not the raw data. Common mistake: passing data to dip_pval erroneously.

fix

Call dip_pval(dipstat_result, n) where n = len(data).

affects: all

breakingIn version 0.9.0, the function dip_pvals was renamed to dip_pval. Old code using dip_pvals will break.

fix

Update to dip_pval(dip, n) or pin version <0.9.0.

affects: <0.9.0

gotchaThe dip test is sensitive to sample size. For very small samples (n < 20), p-values may be unreliable.

fix

Use with caution for n < 20; consider alternative tests.

affects: all

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'diptest'

Package not installed.

fix

Run 'pip install diptest'.

ValueError: n must be >= 2

Passing a single-element array or empty array to dipstat.

fix

Ensure input data has at least two elements.

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Version history

0.11.0latest on PyPI · released Apr 24, 2026

Audit

Dependencies

numpyrequiredData manipulation and array operations

Agent activity

40 hits · last 30 days

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OpenAI (training)

Resources

githubhttps://github.com/RUrlus/diptest ↗

homepagehttps://github.com/RUrlus/diptest ↗