Methods of data collection, processing and analysis in digital marketing have become increasingly important in recent years. New analytical tools and methods are being developed that provide a more comprehensive insight into the behaviour of online users, the ability to predict their next steps and enable their segmentation into categories according to interests, demographic data, shopping habits and previous searches. One such analytical tool is Google Analytics, which was upgraded in October 2020 to a new version called Google Analytics 4. The purpose of the master's thesis was to review the available documentation for the implementation of this new version and to analyse the differences in the data model and recorded statistics compared to the previous version, ie. Universal Analytics. We conducted the research through an analytical implementation of both versions using the Google Tag Manager tool. Based on the implemented analytical events, we set up test scenarios in order to verify the triggering and recording of analytical events and the associated parameters under various conditions. The results of the test scenarios allowed us to calculate and compare the differences in statistical metrics of website visits and conversion metrics recorded in Universal Analytics and Google Analytics 4. The calculated values and the discrepancies between them made it possible for us to confirm or refute the set hypotheses, while the results of the test scenarios provided us with answers as to why there are differences in the recorded values of metrics.
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