The sentiment is based on the number of real-money accounts (not demo) on FX Blue which are currently net-long or net-short. The figures use the number of accounts, not individual trades or volume, so that the percentages are not biased by factors such as algorithmic grid systems, or by the institutional users of FX Blue trading relatively large volumes. You can filter the list so that it only shows the sentiment for a single currency such as EUR or USD. For ease of comparison, all movements will then be stated in terms of that base currency. For example, if you select USD then the list will show you the moves for USD/JPY, USD/EUR (instead of EUR/USD) so that you can more easily compare the sentiment in the dollar against other currencies. You can sort the sentiment list, and you can also choose whether to display it as bars or as a gauges.