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https://github.com/jsvine/weightedcalcs
Pandas-based utility to calculate weighted means, medians, distributions, standard deviations, and more.
https://github.com/jsvine/weightedcalcs
pandas statistics
Last synced: 1 day ago
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Pandas-based utility to calculate weighted means, medians, distributions, standard deviations, and more.
- Host: GitHub
- URL: https://github.com/jsvine/weightedcalcs
- Owner: jsvine
- License: mit
- Created: 2016-12-23T05:09:36.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2024-11-10T18:51:05.000Z (about 1 month ago)
- Last Synced: 2024-12-15T00:52:38.433Z (8 days ago)
- Topics: pandas, statistics
- Language: Python
- Size: 1.57 MB
- Stars: 107
- Watchers: 7
- Forks: 7
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE.txt
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README
[](https://pypi.python.org/pypi/weightedcalcs) [](https://travis-ci.org/jsvine/weightedcalcs) [](https://coveralls.io/github/jsvine/weightedcalcs) [](https://pypi.python.org/pypi/weightedcalcs)
# weightedcalcs
`weightedcalcs` is a `pandas`-based Python library for calculating weighted means, medians, standard deviations, and more.
## Features
- Plays well with `pandas`.
- Support for weighted means, medians, quantiles, standard deviations, and distributions.
- Support for grouped calculations, using `DataFrameGroupBy` objects.
- Raises an error when your data contains null-values.
- Full test coverage.
## Installation
```sh
pip install weightedcalcs
```
## Usage
### Getting started
Every weighted calculation in `weightedcalcs` begins with an instance of the `weightedcalcs.Calculator` class. `Calculator` takes one argument: the name of your weighting variable. So if you're analyzing a survey where the weighting variable is called `"resp_weight"`, you'd do this:
```python
import weightedcalcs as wc
calc = wc.Calculator("resp_weight")
```
### Types of calculations
Currently, `weightedcalcs.Calculator` supports the following calculations:
- `calc.mean(my_data, value_var)`: The weighted arithmetic average of `value_var`.
- `calc.quantile(my_data, value_var, q)`: The weighted quantile of `value_var`, where `q` is between 0 and 1.
- `calc.median(my_data, value_var)`: The weighted median of `value_var`, equivalent to `.quantile(...)` where `q=0.5`.
- `calc.std(my_data, value_var)`: The weighted standard deviation of `value_var`.
- `calc.distribution(my_data, value_var)`: The weighted proportions of `value_var`, interpreting `value_var` as categories.
- `calc.count(my_data)`: The weighted count of all observations, i.e., the total weight.
- `calc.sum(my_data, value_var)`: The weighted sum of `value_var`.
The `obj` parameter above should one of the following:
- A `pandas` `DataFrame` object
- A `pandas` `DataFrame.groupby` object
- A plain Python dictionary where the keys are column names and the values are equal-length lists.
### Basic example
Below is a basic example of using `weightedcalcs` to find what percentage of Wyoming residents are married, divorced, et cetera:
```python
import pandas as pd
import weightedcalcs as wc
# Load the 2015 American Community Survey person-level responses for Wyoming
responses = pd.read_csv("examples/data/acs-2015-pums-wy-simple.csv")
# `PWGTP` is the weighting variable used in the ACS's person-level data
calc = wc.Calculator("PWGTP")
# Get the distribution of marriage-status responses
calc.distribution(responses, "marriage_status").round(3).sort_values(ascending=False)
# -- Output --
# marriage_status
# Married 0.425
# Never married or under 15 years old 0.421
# Divorced 0.097
# Widowed 0.046
# Separated 0.012
# Name: PWGTP, dtype: float64
```
### More examples
[See this notebook to see examples of other calculations, including grouped calculations.](examples/notebooks/example-usage.ipynb)
[Max Ghenis](https://github.com/MaxGhenis) has created [a version of the example notebook that can be run directly in your browser](https://colab.research.google.com/gist/MaxGhenis/4c96163eacebc1005419c9533a568c7e/weightedcalcs-example-usage-scf.ipynb), via Google Colab.
### Weightedcalcs in the wild
- "[Procesando los microdatos de la Encuesta Permanente de Hogares](http://blog.jazzido.com/2017/01/09/procesando-microdatos-eph)," by Manuel Aristarán
- [BuzzFeedNews/2017-01-media-platform-and-news-trust-survey](https://github.com/BuzzFeedNews/2017-01-media-platform-and-news-trust-survey/blob/master/notebooks/platform-trust-additional-analysis.ipynb)
- [BuzzFeedNews/2016-12-transgender-rights-survey](https://github.com/BuzzFeedNews/2016-12-transgender-rights-survey/blob/master/notebooks/additional-analysis.ipynb)
## Other Python weighted-calculation libraries
- [`tinybike/weightedstats`](https://github.com/tinybike/weightedstats)
- [`nudomarinero/wquantiles`](https://github.com/nudomarinero/wquantiles/)