dhis2-devs team mailing list archive

[Calle Hedberg <calle.hedberg@xxxxxxxxx>]

Hi,

Ah - bugger, I completely forgot about then zero or positive type, which
provides the same effect (if set). my bad..

Jason's point is correct, but in my opinion less important for most types
of routine data where the primary function of the min-max values is to
highlight likely data capturing mistakes.

Regards
Calle

On 18 September 2015 at 13:10, jason.p.pickering <1065014@xxxxxxxxxxxxxxxxxx
> wrote:

> Hi there. The current design is to take the mean, and calculate n-standard
> deviations away from the mean, for a given data element/orgunit/catcombo
> set of data values. If the data value is set to be zero or positive
> integer, and can never have a negative value and does not follow a normal
> distribution, then flooring the projected min/max at zero makes little
> sense, if the distribution is not normal. Another distribution would be
> required to determine what the accepted min/max actually are (logistical,
> zero-inflated model, etc) if the actual distribution is not normal.
>
> But per the bug report, the application does what it is supposed to do,
> namely calculate the theoretical min/max based on a stastical routine,
> which itself may not be valid without confirming that the distribution in
> question actually is normal or not.
>
> Regards,
> Jason
>
>
> On Fri, Sep 18, 2015 at 11:57 AM, Lars Helge Øverland <larshelge@xxxxxxxxx
> >
> wrote:
>
> > This is not a design flaw. It depends on the data element value type
> > property. The default value type is "number", for which negative values
> > are perfectly valid. One can set the value type to "Positive number", in
> > this case the min-max values will never be less than zero.
> >
> > ** Changed in: dhis2
> >        Status: Opinion => Invalid
> >
> > --
> > You received this bug notification because you are a member of DHIS 2
> > developers, which is subscribed to DHIS.
> > https://bugs.launchpad.net/bugs/1065014
> >
> > Title:
> >   Min/Max generation goes into negative
> >
> > Status in DHIS:
> >   Invalid
> >
> > Bug description:
> >   A very minor bug, but the min/max generation algorithm (which I assume
> >   is some std. dev) sometimes leads the minimum to be a negative number.
> >   Probably not an issue per se for data quality, as the alternative
> >   would be to set it to 0 (unless there is a reason why you would enter
> >   negative numbers), but the chart you get when you double-click a data
> >   entry field is then skewed and does not look very sensible. In extreme
> >   cases, with a few very high values and a few months with very low (as
> >   when you have campaigns or hand-outs), the minimum can be down to
> >   minus a lot.
> >
> > To manage notifications about this bug go to:
> > https://bugs.launchpad.net/dhis2/+bug/1065014/+subscriptions
> >
> > _______________________________________________
> > Mailing list: https://launchpad.net/~dhis2-devs
> > Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
> > Unsubscribe : https://launchpad.net/~dhis2-devs
> > More help   : https://help.launchpad.net/ListHelp
> >
>
>
> --
> Jason P. Pickering
> email: jason.p.pickering@xxxxxxxxx
> tel:+46764147049
>
> --
> You received this bug notification because you are a member of DHIS 2
> developers, which is subscribed to DHIS.
> https://bugs.launchpad.net/bugs/1065014
>
> Title:
>   Min/Max generation goes into negative
>
> Status in DHIS:
>   Invalid
>
> Bug description:
>   A very minor bug, but the min/max generation algorithm (which I assume
>   is some std. dev) sometimes leads the minimum to be a negative number.
>   Probably not an issue per se for data quality, as the alternative
>   would be to set it to 0 (unless there is a reason why you would enter
>   negative numbers), but the chart you get when you double-click a data
>   entry field is then skewed and does not look very sensible. In extreme
>   cases, with a few very high values and a few months with very low (as
>   when you have campaigns or hand-outs), the minimum can be down to
>   minus a lot.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/dhis2/+bug/1065014/+subscriptions
>
> _______________________________________________
> Mailing list: https://launchpad.net/~dhis2-devs
> Post to     : dhis2-devs@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~dhis2-devs
> More help   : https://help.launchpad.net/ListHelp
>



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Calle Hedberg

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