12 month moving average - which forms the top of the Z
> Dear All,
>
> A request for something that I've drawn a blank on.
>
> In the old days I learned about Z (time series) Charts: they consist of
> three curves; and when plotted they always form a letter Z.Spooky or what?
>
> Anyway, I remember two out of the three curves:
>
> curve one = the actual data
> curve two = the actual data accumulated
>
> but
>
> curve three = can't remember and can't work it out.
>
> Anyone have a stats book with such a thing, or that has a website address
> they can point me at?
>
> I'd be grateful.
>
> Duncan Williamson
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