My apologies, the trade TICK is the same formula as TRIN, but based on most recent tick, as opposed to cumulative. This takes volume into account as well as issues. For example, using trade TICK, (.TTIN & .TTIO on ILX), a down tick of 1/2 the trading issues, if those 1/2 were the heavily traded stocks (MSFT's, ORCL's, GE's etc....) it would have muck more impact than if the 1/2 issues which declined were much thinner issues.