Simon, It seems to be same as: Ref(Data1<Data2,-1) AND Data1>Data2; In other two cases the results may not be as desired. That is why sometimes it is more appropriate NOT to use CROSS function, and use the long REF version as above. Regards SMG (My version MS Pro 9.1 - I think in some previous versions, the behaviour was per one of two other options - But I an not very much sure about previous versions)

Simon, You can make a Custom Indicator with the Formula: Cross(C,1) And check the results - It seems to work on Day 3, however there have been some instances with me when the results have not been as desired and I had to switch to the long REF version. For example, suppose the Close on the Right Most bar of the chart is 1.05 and the Close of the bar on the left of the Right Most bar is 1.00, then the following formula will not plot TRUE: Cross(C,ValueWhen(1,Cum(1) = LastValue(Cum(1)-1),C)); Whereas Cross(C,1) formula will plot true. While we are talking about REF based formulas we are working on only two bars, whereas CROSS seems to be taking more than two bars in consideration. So, it might depend on the needs of individual case - sometimes CROSS might be appropriate and sometimes REF. Take care while plotting above formula, it will just plot a dot on the right most bar, so you may find it invisible. Regards SMG