Has anyone done a survey on open source programmers?

Question

I've tried to research this through searching, but got nowhere. Has anyone done a survey of open source programmers to answer questions such as:

• Do you do this as part of your job?
• If so, how much of your job is it?
• If you do it in your spare time, how much time do you spend on it?
• Are you a student?
• What motivates you?

I'm amazed at how many lines of open source code have been written, and I wonder where it all comes from.

I'm not wanting to do such a survey myself, it's only curiosity, not something I need to find out.

Answer 1

I would say for a random selection of people the answers to 1 - 4 are "yes" :).

For more information on the motivations I recommend reading:

The Cathedral and the Bazaar and Hackers and Painters

Answer 2

There are hundreds of such studies available. I get such questionnaires at least once a month from different companies/universities.

Answer 3

Thanks for that answer Stefan. I've spent a while googling, but you've given me a good search. I probably should have used the word motivation and that would have returned more suitable stuff than I was finding.