i know if a page link to a unrelevant site. the pr of that page could reduce. but if I let link page to link to unrelevant page and let unrelevant page link to my home page. so I want to know if pr of my homepage will not be affect by link to unrelevant page?
this is a common sense. link to unrelevant site will reduce you position of serp also pr. because if not, you will sell much links to many unrelevant sites for make money without loss.
This is bollocks. It is the links to your site that matter in the SERPs. It's true that a link out from your site can 'pass' PR value, but think of it like a switch which either passes PR or it doesn't - it doesn't cost you any more just because you happen to be linking to a relevant site.
if you are going to link a web site (related or nonrelated), the pr of your page will reduce. pr will pass to the page that you link
Yes its true, PR is PR whether relevant link or not. The link either passes the "juice" or not, relevant links help your rankings but don't influence the amount of PR that passes.
do you mean if you link to page outside whether relevant or not pr must reduce somewhat? when link pass juice ,when not? do you mean juice is benefit from backlink?
If we're talking leaks you leak the same amount regardless of where you link to. It will be of more benefit to the other site (but not detriment to you) if you link to a relevant site.
If you link to a site you pass PR to it, whether it's a relevant site or not. Try not worry about it too much - just think before you link.