The analysis of video footage created during these experiments, however, was relatively inconvenient so far, since the capability of z-Tree to interact with other software packages was limited until recently. Part of z-Tree’s popularity is presumably due to its simplicity and the convenience of creating even complex experiments with only very little programming effort. Z-Tree is versatile and yet easy to learn-starting with version 3.5.0-users can even record the current time on the client machine. Urs Fischbacher’s experimental software z-Tree (Fischbacher 2007) is very popular around the globe and is among the most-used experimental softwares, having been cited more than 8000 times as of 2019 according to Google Scholar. A large number of laboratory experiments are nowadays conducted using computers as a result of the spread of computerized laboratories at major universities and research institutions. In economics, conducting laboratory experiments to determine causal relationships has become increasingly fashionable over the last few decades.
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