I've an affiliate website and most of outgoing links on my websites are nofollow, does this cause any negative impact on my website PR?
No, it won't do anything to your pagerank. And if it does something it would indirectly be possitive, but never negative. Remember that a link is a vote, the nofollow tag only make this " vote" invisible to be counted as a vote. Many invisible votes doesn't hurt anybody. By the way, can you thing of a reason why it should be negative from the point of view of the guys from Google? I can't.
I already answered your question on SitePoint, but the answer remains the same - no, it won't negatively impact it.
@Dan Schulz - I think 100 % NoFollow have some impact on our PR Here is what i found - 100.0% of the External Incoming Links may be considered "Paid Links" because they are NOT editorially given and are NOT nofollowed I know you are mod in SP and also a SEO expert but i think it has some impact in our PR I will recommend 'sexytechie' to have few outgoings to some big sites like wikipedia,cnn etc Regards, Rohit
It's a good idea to nofollow your affiliate links. I like to keep any affiliate data on a site separate from my real and unique content. Then the real content site links to the "affiliate content" site will nofollow.
No, it won't do anything to your pagerank. Nofollow means that the link is simply ignored, it will not be taken into calculation. If you have links on websites with nofollow you can consider them "dead" for PR. Anyway PR means nothing in modern Internet Business Promotion so you might as well forget it.