Léopold Simar and Valentin Zelenyuk, "Statistical Inference for Aggregates
of Farrell-type Efficiencies", Journal of Applied Econometrics, Vol. 22, 
No. 7, 2007, pp. 1367-1394.

In the dataset we use, there are 142 firms from various business sectors in
Ukraine: Chemical, Construction, Engineering, Metallurgy, Services,
Transport and Food industries.  

For each firm, we have information on (proxies of) 3 inputs (labor, capital,
and materials) and one proxy of all outputs produced (total revenue).  All
firms are categorized into two groups: firms with foreign ownership and
otherwise.

Our goal would be to estimate (for the two groups and the entire sample) the
original DEA estimates, their bootstrap-based bias-corrected analogs,
standard errors, and confidence intervals.  Finally, we would like to test
comparing the two groups: whether the group of firms with foreign share of
ownership experienced higher efficiency than the group of purely local
firms.

More details of data sources, description and economic context can be found
in: Zelenyuk, V., Zheka, V. 2004. "Corporate Governance and Firm's
Efficiency: The Case of a Transitional Country, Ukraine." Journal of
Productivity Analysis (2006) vol.25, pp. 143-168.

The data are available in two formats. The file szdata.txt is an ASCII text
file in DOS format. The file szdata.xls is an Excel spreadsheet. Both files
are zipped in the file szdata.zip.

In addition, the file szprogs.zip contains a large number of Matlab files
that were used to compute various things. See the included readme file for
details.