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Downloading - Microfinance Information Exchange

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APPENDICES<br />

Statistical Issues<br />

The Bulletin reports the average of performance<br />

indicators for each peer group. At this stage, peer<br />

groups are still small and the observations in each<br />

peer group show a high degree of variance. Outliers<br />

distort the results of some of the peer group<br />

averages. Consequently, the reader should be cautious<br />

about the interpretive power of these data.<br />

Over time, as more MFIs provide data, we will be in<br />

a better position to generate deeper and more sophisticated<br />

types of analyses and will have a higher<br />

degree of comfort with the statistical significance of<br />

the differences between the means of the distinct<br />

peer groups.<br />

In the case of peer groups where outliers distort the<br />

average result, reader may want to use the median<br />

value for analysis. The median value is the point in<br />

the sample at which 50% of the observations lie<br />

above the result and 50% lie below it.<br />

The electronic version of the Bulletin tables contains<br />

a more extensive set of data, including all<br />

other descriptive statistics for each indicator and<br />

each peer group: average, median, standard deviation,<br />

minimum, maximum and number of observations.<br />

These tables can be found online at<br />

www.mixmbb.org.<br />

70 MICROBANKING BULLETIN, MARCH 2005

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