Hmmm... visitors may initially leave your site to check out relevant information. But can you recall your behavior on sites that link to good articles outside their domain? Personally, I always come back to sites I feel provide commentary and additional resources. Sometimes I stay on the original site and just open up the interesting link in a different tab. It's likely that with relevant outbound links you'll gain repeat visitors, and you won't lose them forever.
Descriptive anchor text (the visible text in a hyperlink) helps accurately inter-connect the web. It allows both users and Googlebot to better understand what they're likely to find when following a link to another page. So if it's not too much trouble, try making anchor text descriptive.
If you're linking to content you believe your users will enjoy, then please don't worry about the site's perceived PageRank. As a webmaster, the things to be wary of regarding outbound links are listed above, such as losing credibility by linking to spammy sites. Otherwise, consider outbound links as a common sense way to provide more value to your users, not a complicated formula.
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