I was wondering about how are the estimated person years calculated for a particular project. What are the parameters considered in the calculation ?
For the Project Cost calculator only, we use the Basic COCOMO model. This model considers only the total lines of code when estimating the years of effort required:
months = a * (KLOC) ^ b
a and b are arbitrary constants. Ohloh uses typical values of 2.4 and 1.05.
You can read more about COCOMO at wikipedia.
This is the only place on the website where we use COCOMO estimates. Elsewhere on the website (such as on the contributors pages), we measure the time more precisely by examining the actual source control logs.
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