Jonic writes a post well worth reading, especially for new bloggers, at Are you skewing your own website stats?:
‘Almost everyone who has their own website loves checking their stats to find out how it’s doing, especially those of us who are in the business of blogging. For some it can be a method of boosting ones ego, for others it can offer the idea to set them up with better performing sites. Nearly everyone who operates a website does it. It becomes something of an addiction, and some people will often check their stats a number of times a day. But are you rendering your own stats useless?’
I know when I first started blogging that my own viewing of my blog definitely skewed my statistics. It probably doesn’t really matter in the scheme of things (and on highly trafficked blogs the skewing would be pretty insignificant) but if you love your stats and want them to be as accurate as possible Jonic’s post might help.