The value of the Winkdex (including a daily spot price) is determined using Bitcoin Exchange transaction data on a moving average basis over a trailing two hour period. The proprietary Winkdex formula not only utilizes the most recent Bitcoin Exchange transactions, but also volume weights those transactions on a proportional basis. In order to reflect the latest in pricing information, the most recent transactions are weighted exponentially greater than earlier transactions in the two hour period.
http://winkdex.com/#/formula
