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Well 50 quid seemed a lot of money to pay for that (and some other odd bits and pieces) so I worked it out using third form arithmetic and here it is in case anybody wants to use it.

If you use a 10 day moving average and you are looking for a buy signal, today's closing price must be greater than or equal to the 9 day moving average.

In general the method is to use an n-1 day moving average close for an n day moving average/price cross over. This follows simply from the definition of a simple moving average.

I like the idea because you can check for the cross-over at 15:00h and buy in before the open the next day.

If anybody finds a way of identifying buy candidates in the current market let me know - but if course it works with shorting too.

Darth.