PySAL 1.6 Officially Released

See the following announcement from one of our editorial board members (Serge Rey) highlighting the official release of PySal 1.6.

PySAL is a library of tools for spatial data analysis and
geocomputation written in Python. PySAL 1.6, the seventh official
release of PySAL brings the following key enhancements:

### Spatial weights (weights)

* Optimized contiguity builder
* Explicit checks for disconnected observations (islands)
* Lightweight sparse weights class
* Handle coincident points in construction of distance based weights
* Optimized construction of knn weights

### Spatial regression (spreg)

* Chow test on spatial autoregressive coefficient in error, lag and combination regime models
* Kernel based weights specialized for HAC estimators
* Group-wise heteroskedasticity correction for OLS models with regimes
* Optimal GMM estimator to account for heteroskedasticity in TSLS models with regimes

### Spatial inequality (inequality)

* Spatial decomposition of the Gini coefficient

### Computational geometry (cg)

* Robust segment intersection tests

among the 246 commits and bug fixes since the last release, 6 months ago.

In addition, 1.6 marks the first release since PySAL moved from Google Code to GitHub

## PySAL modules

* pysal.core — Core Data Structures and IO
* pysal.cg — Computational Geometry
* pysal.esda — Exploratory Spatial Data Analysis
* pysal.inequality — Spatial Inequality Analysis
* pysal.spatial_dynamics — Spatial Dynamics
* pysal.spreg – Regression and Diagnostics
* pysal.region — Spatially Constrained Clustering
* pysal.weights — Spatial Weights
* pysal.FileIO — PySAL FileIO: Module for reading and writing various file types in a Pythonic way

## Downloads

Source distributions are available at
http://pypi.python.org/pypi/PySAL

Binary installers are availble from the [GeoDa Center for Geospatial Analysis and Computation](https://geodacenter.asu.edu/projects/pysal)

PySAL can also be installed with pip or easy_install.

## Documentation
The documentation site is here
http://pythonhosted.org/PySAL/

## Web sites
PySAL’s home is here
http://pysal.org/

The developer’s site is here
https://github.com/pysal/pysal

## Mailing Lists
Please see the developer’s list here
http://groups.google.com/group/pysal-dev

Help for users is here
http://groups.google.com/group/openspace-list

## Bug reports and feature requests
To search for or report bugs, as well as request enhancements, please see
https://github.com/pysal/pysal/issues

## License information
See the file “LICENSE.txt” for information on the history of this
software, terms & conditions for usage, and a DISCLAIMER OF ALL
WARRANTIES.

Many thanks to [all who contributed!](https://github.com/pysal/pysal/blob/master/THANKS.txt)