I have a site with only a small number of visitors. Using the "days since last visit" dimension in Google Analytics I thought I could work out a flow of individual visitors from day to day:
Date OS Browser Days Since Res Visitor Type
20120413 Win7 IE8 0 1140x641 New Visitor
20120815 Win7 IE8 123 1366x768 Returning Visitor
20120827 Win7 IE8 12 1366x768 Returning Visitor
20121019 Win7 IE8 51 1366x768 Returning Visitor
20121024 Win7 IE8 4 1249x702 Returning Visitor
20121026 Win7 IE8 1 1366x768 Returning Visitor
Based on the dates / days since info these visits are all from the same visitor (there are no other IE8 / Win 7 visitors within the relevant 24 hour buckets) but the screen resolution is different and so I question the data.
Is the resolution value in analytics based on some system value, or is it possible for analytics to report different resolutions depending on something as arbitrary as e.g. the browser window size?
EDIT: From GA docs it appears that this IS intended to be screen resolution; unless the DOM value from IE8 is different to what GA thinks it should be?