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README.md

Quantipy

Python for people data

Quantipy is an open-source data processing, analysis and reporting software project that builds on the excellent pandas and numpy libraries. Aimed at people data, Quantipy offers support for native handling of special data types like multiple choice variables, statistical analysis using case or observation weights, DataFrame metadata and pretty data exports.

Quantipy for Python 3

This repository is a port of Quantipy from Python 2.x to Python 3.

Key features

  • Reads plain .csv, converts from Dimensions, SPSS, Decipher, or Ascribe
  • Open metadata format to describe and manage datasets
  • Powerful, metadata-driven cleaning, editing, recoding and transformation of datasets
  • Computation and assessment of data weights
  • Easy-to-use analysis interface

Features not yet supported in python3

  • Automated data aggregation using Batch defintions
  • Structured analysis and reporting via Chain and Cluster containers
  • Exports to SPSS, Dimensions ddf/mdd, MS Excel and Powerpoint with flexible layouts and various options

Contributors

Installation

Quantipy is currently not published on pip (there's an issue for that, if you want to help out.)

To start using Quantipy we

  1. Create a virtual environment
  2. Download or clone the library
  3. Install the required packages

1. Create a virtual envirionment

Create a virtual environment:

conda

conda create -n envqp python=3

with venv

python -m venv [your_env_name]

2. Download or clone library

git clone https://github.com/Quantipy/quantipy3.git

Add the quantipy3 folder that is created to your path, so you can import quantipy from wherever you are working.

3. Install required libraries

Activate your virtual environment and install all the required packages.

source [yourenv]/bin/activate
pip install -r quantipy3/requirements.txt

You're all set, now you can start crunching your survey data with ease.

5-minutes to Quantipy

Get started

If you are working with SPSS, import your sav file.

import quantipy as qp
dataset = qp.DataSet("My dataset, wave 1")
dataset.read_spss('my_file.sav')

You can start straight away by exploring what variables are in your file.

dataset.variables()
['gender',
 'agecat',
 'price_satisfaction',
 'numitems_satisfaction',
 'org_satisfaction',
 'service_satisfaction',
 'quality_satisfaction',
 'overall_satisfaction',
 'weight']

If you want more details on a variable, explore it's meta data.

dataset.meta('agecat')
single codes texts missing
agecat: Age category
1 1 18-24 None
2 2 25-34 None
3 3 35-49 None
4 4 50-64 None
5 5 64+ None

Quantipy knows out-of-the-box what SPSS's meta data means and uses it correctly. All codes and labels are the same as in the sav file.

Calculate some results, counts or percentages

dataset.crosstab('price_satisfaction', 'gender')
Question agecat. Age category
Values All 18-24 25-34 35-49 50-64 64+
Question Values
price_satisfaction. Price satisfaction All 582.0 46.0 127.0 230.0 147.0 32.0
Strongly Negative 72.0 8.0 20.0 22.0 17.0 5.0
Somewhat Negative 135.0 10.0 30.0 52.0 38.0 5.0
Neutral 140.0 9.0 32.0 59.0 36.0 4.0
Somewhat Positive 145.0 12.0 25.0 63.0 33.0 12.0
Strongly Positive 90.0 7.0 20.0 34.0 23.0 6.0

You can also filter

dataset.crosstab('price_satisfaction', 'agecat', f={'gender':1})

and use a weight column

dataset.crosstab('price_satisfaction', 'agecat', f={'gender':1}, w="weight")

Variables can be created, recoded or edited with DataSet methods, e.g. derive():

mapper = [(1,  '18-35 year old', {'agecat': [1,2]}),
          (2, '36 and older', {'agecat': [3,4,5]})]

dataset.derive('two_age_groups', 'single', dataset.text("Older or younger than 35"), mapper)
dataset.meta('two_age_groups')
single                                              codes     texts              missing
two_age_groups: "Older or youngar than 35"
1                                                       1     18-35 years old    None
2                                                       2     36 and older       None

The DataSet case data component can be inspected with the []-indexer, as known from a pd.DataFrame:

dataset[['gender', 'age']].head(5)
        gender  age
0       1.0    1.0
1       2.0    1.0
2       2.0    2.0
3       1.0    NaN
4       NaN    1.0

Contributing

The test suite for Quantipy can be run with the command

python3 -m unittest

But when developing a specific aspect of Quantipy, it might be quicker to run (e.g. for the DataSet)

python3 -m unittest tests.test_dataset

Tests for unsupported features are skipped, see here for what tests are supported.

We welcome volunteers and supporters. Please include a test case with any pull request, especially those that run calculations.

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