We typically see a 3-5% variance in sales when comparing Adobe to our Business (SAP/BI) systems (usually Adobe is a bit low). What is considered to be a normal variance? What typically causes such a variance? For lack of evidence of other causes, I have always suspected that the tracking pixel (located 75% down the page) doesn't have a chance to load before the consumer closes the window. Other thoughts or sources of what is industry standard is most welcome. Thank you!