Stats discrepancies between different tools

Trying to make some sense of joined up data

[HelenDev]

I am using Google Analytics as my main stats package, but am also using Crazy Egg and Feedburner to gather data for our site. Recently I have been asked to put together reports and analysis on all of our stats but am finding it very difficult to make sense of it all when put together. These are two of the problems which I'm having:

Problem 1: For a selected 30 day time period for a particular page Crazy Egg reports 61 visits and 12 clicks. For the same time period and page Google Analytics reports 261 Unique Views and 366 Pageviews. The GA overlay and Crazy egg diagram also show clicks in different places.

Problem 2: Feedburner reports 90 views and 15 clicks of my RSS feed for a selected 30 day time period. Google Analytics reports 13 visits referred by Feedburner, so this kind of does tally up, but then Google Analytics goes on to report that for the home page during that time period there were 125 unique page views as feedburner referrers. How does this add up?

I realise not everyone will be familiar with all the packages I'm using but I'm hoping someone here can point out some possible reasons why the data doesn't seem to add up, or anything I just haven't thought of! Perhaps for example I'm simply misunderstanding the relationship between unique pageviews and visits?

Hoping someone can shed some light :)

[HelenDev]

No ideas on this one at all? :(

I don't need exact answers to my problems, but if anyone has any general thoughts on why these kinds of discrepancies might occur, or if they can point out where I'm making daft assumptions, I would be really interested to hear them.

[g1smd]

Some of the assumptions made by the Analytics software can be daft.

One that I noticed (easily, because there really was only one visitor) was that GA tracked someone who came from a Yahoo search. They later visited the site directly (not from SERPs) on several other occasions, but GA reported that they came from Yahoo on those later visits too. Yeah, they did originally on the first visit, but not on the later ones.