[R] Fitting a 3-parameter gammadistribution

[Mårten Bjellerup]

I have 'grouped' data, that is in the form of:

Interval        Median
0-9.9%:        -25
10-19.9%:     0
20-29.9%:     3
30-39.9%:     10
40-49.9%:     50
50-59.9%:     200
et cetera

and want to fit a three parameter gamma distribution. Does anyone know of an existing routine for doing this (or something similar)? Any help or comment is much appreciated.

Regards,

Mårten

Mårten Bjellerup
Doctoral Student in Economics
School of Management and Economics
Växjö University
SE-351 95  Växjö
Sweden

Tel: +46 470 708410 
Fax: +46 470 82478 
Mobile: +46 70 969 88 88 
Mail: marten.bjellerup at ehv.vxu.se 
Web: http://www.ehv.vxu.se
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"Forecasting is like trying to
drive a car blindfolded and
following directions given 
by a person who is looking
out of the back window"