It does contaminate your Google analytics, as standard reports will exhibit collective data in its place of data per site. This can severely hinder you in analyzing every site's performance and increase imminent in to what you want to develop. You can effort around this with no putting novel tracking codes on every site by making a divide profile in Google analytics for every site, and apply a filter to all to just calculate traffic to a precise domain name. For instance if you have mysite1.com, mysite2.com, and so on, all utilizing the similar tracking code, you setup a dissimilar profile in Google Analytic for every site. After that for the profile for mysite1.com, you construct a filter:
Code:
Filter type: Cus filter > Include
Filter field: Hostname
Filter pattern: (^mysite1\.com|\.mysite1\.com)
And after that you do the similar for mysite2.com, mysite3.com, and so forth. Every profile will afterward just exhibit the data for traffic to that particular domain.
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