It should be the unweighted mean to avoid bias towards I+ or I-
(or Kevin Cowtan had a more complicated way)
Phil
> On 12 Mar 2017, at 17:58, Eleanor Dodson <[log in to unmask]> wrote:
>
> You read:
> h k l IPLUS SIGIPLUS INEG SIGINEG
> Then program calculates this:
>
> SIGIMEAN = SIGIPLUS*SIGINEG/(SIGIPLUS+SIGINEG)
>
> IMEAN = (IPLUS/SIGIPLUS + INEG/SIGINEG)*SIGIMEAN
>
> ie: IMEAN = ( IPLUS*SIGINEG + INEG * SIGIPLUS ) / /(SIGIPLUS+SIGINEG)
>
> Is that the right thing to do? Not sure!
>
> Eleanor Dodson
>
>
>
> On 11 March 2017 at 15:18, Karthikeyan Subramanian <[log in to unmask]> wrote:
> Dear CCP4bb,
>
> How IMEAN and SIGIMEAN is calculated in scalepack2mtz if the input is with anomalous intensity (obtained from HKL2000). Any guide/reference is highly appreciated.
>
> Thanks in advance,
>
> With regards
>
> Karthikeyan S.
>
> Principal Scientist
>
> IMTECH, Chandigarh
>
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