G*Power is a free, open source program for power analysis and sample size calculations: it is available for both Windows and Mac at http://www.gpower.hhu.de/en.html.
G*Power is a free, open source program for power analysis and sample size calculations: it is available for both Windows and Mac at http://www.gpower.hhu.de/en.html.
I think you would need to stratify the NGOs by size of NGO in terms of Financial Resources, Geographical area of operation and activity focus or methodologies used, to get meaningful analysis.