st: updated package -surveybias- available in SSC

[Kai Arzheimer <kai.listen@googlemail.com>]

surveybias- has been updated in SSC, with thanks to Kit Baum.

surveybias is a Stata module that calculates various measures of survey
accuracy for situations where the distribution of a categorical variable in the
population is known (e.g. pre-election surveys). It is based on recent research
that extends the older Martin, Traugott & Kennedy measure to the
multi-party case
(Arzheimer & Evans 2013, A New Multinomial Accuracy Measure for Polling
Bias, Political Analysis, dx.doi.org/10.1093/pan/mpt012, ungated this week).

This update (version 1.0) brings a number of bug fixes, two toy data sets
to illustrate the use of the module, and a new command -surveybiasseries-.
-surveybiasseries- makes it very easy to calculate accuracy measures from a
series of published results (say a whole set of pre-election polls run by
various companies over the course of a campaign). Access to the raw data is
not required.

If you have already installed surveybias, you can update by running
-adoupdate- . To install for the first time, runs -ssc install surveybias-.

Best,
Kai
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