Branislav Blesák's Profile

By far the biggest source of error in analytics is implementation error.

One of these is the placement of JavaScript on the site, as being placed far down on a page may result in some users leaving the page before the JavaScript can execute.

Page views tend to have a smaller level of variance.

According to this data, the third party cookie blocking and deletion rate exceeds the first party cookie blocking and deletion rate by a little more than 13%

It should be noted that the packages use different methods for setting their cookies. For example, HBX Analytics requires you to setup a CNAME record in your DNS configuration file (note that DNS A records can also be used) to remap a sub-domain of your site to one of their servers.

In another test, for which the results are shown in Section 6, we showed that an execution delay of 1.4 seconds would result in a loss of 2% to 4% of the data. It is our theory that as the delay in execution expands the amount of lost data increases.

As Jim Sterne is fond of saying, if your yardstick measures 39 inches instead of 36 inches, it's still great to have a measurement tool. The 39 inch yardstick will still help you measure changes with a great deal of accuracy. So if tomorrow your 39 inch yardstick tells you that you are at 1 yard and 1 inch (i.e., 40 inches), you know you have made some progress.