A method of storing collected data on a wireless device. User interaction with a wireless device and/or the performance of the wireless device is monitored and data related thereto collected. The collected data may be structured into a tagged hierarchical structure comprising a plurality of events that are separate and independent from one another. Each event may describe a specific application with a plurality of attributes. The tagged hierarchical structure formed as a tree structure is translated into a syntax generic language. The result may be formed into a compact format using a zipped format and/or a binary-equivalent format and then stored and transmitted to a central location (e.g., a server) for statistical analysis processing. The server transforms the received data into expanded format and forms a hierarchical tree structure for each event and its attributes. The result is processed for producing a statistical analysis of the collected data.