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# Version 0.8.1 (July 22, 2012)

This release includes a few new features, performance enhancements, and over 30 bug fixes from 0.8.0. New features include notably NA friendly string processing functionality and a series of new plot types and options.

## New features

> - Add vectorized string processing methods accessible via Series.str (GH 620)

> - Add option to disable adjustment in EWMA (GH 1584)

> - Radviz plot (GH 1566)

> - Parallel coordinates plot

> - Bootstrap plot

> - Per column styles and secondary y-axis plotting (GH 1559)

> - New datetime converters millisecond plotting (GH 1599)

> - Add option to disable “sparse” display of hierarchical indexes (GH 1538)

> - Series/DataFrame’s `set_index` method can append levels to an existing Index/MultiIndex (GH 1569, GH 1577)

## Performance improvements

> - Improved implementation of rolling min and max (thanks to Bottleneck !)

> - Add accelerated `'median'` GroupBy option (GH 1358)

> - Significantly improve the performance of parsing ISO8601-format date strings with `DatetimeIndex` or `to_datetime` (GH 1571)

> - Improve the performance of GroupBy on single-key aggregations and use with Categorical types

> - Significant datetime parsing performance improvements

## Contributors

A total of 5 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

- Chang She

- Skipper Seabold

- Todd DeLuca +

- Vytautas Jancauskas

- Wes McKinney