I've an affiliate website and most of outgoing links on my website are nofollow, does this cause any negative impact on my website PR?
No. The only negative impact would be on the pages being linked to (your affiliates). But that's not your problem to begin with.
absolutely it has no effect. you make the right, because PR. devided onto pages outside so you save your pr
I've got a site that has thousands of nofollows. No negative impact. The site ranks #1 for its most competitive keyword.