dhis2-devs team mailing list archive

[Calle Hedberg <calle.hedberg@xxxxxxxxx>]

Hi,

Sorry, but if the automatic min-max calculation is simply retrieving the
historical minimum and maximum values, then that makes little sense and
would have no real value.

I don't have time to verify it right now, but my assumption has always been
that DHIS2 is using a method similar to the one in DHIS 1.4:

1.
The user specify a period to be used for the min/max analysis - typically
12-18 months (longer is better in a stable health establishment
environment, but a shorter period might be optimal in areas where patient
numbers are changing rapidly)

2.
The average and standard deviation is calculated for each OrganisationUnit
and DataElement combination

3.
The min is set to the average minus stdev x constant, max is set to average
plus stdev x constant. Typically constants are 1.5 - 2.0  (There is an "Data
analysis std dev factor" specified under General Settings - by default set
to 2.0. System might be using that).

Best regards
Calle


On 20 April 2015 at 14:49, Rodolfo Melia <rmelia@xxxxxxxxxxxx> wrote:

> Thanks Prosper - that makes sense.
> I guess that the only way to set a different rule (e.g., Max should be
> 150% than previous period) the max will need to be set via an app.
>
> Are Max/ Min of a Data Element/ Org Unit exposed in the API ?
>
> R
>
> *Rodolfo Meliá*
> *Principal  |  *rmelia@xxxxxxxxxxxx
> Skype: rod.melia  |  +44 777 576 4090  |  +1 708 872 7636
> www.knowming.com
>
> On Mon, Apr 20, 2015 at 1:29 PM, Prosper BT <ptb3000@xxxxxxxxx> wrote:
>
>> Hi Rodolfo,
>>
>> Used its before and according to the results we got, it takes the ever
>> max and min entered in the selected period for a given dataset.
>>
>> Regards
>>
>> On Mon, Apr 20, 2015 at 3:24 PM, Rodolfo Melia <rmelia@xxxxxxxxxxxx>
>> wrote:
>>
>>> I'm trying to understand how does DHIS generates the Min/ Max values for
>>> a given Data Element/ Period. The documentation
>>> <https://www.dhis2.org/doc/snapshot/en/user/html/ch12s03.html> only
>>> makes reference to the fact that Max/Min can be set manually or
>>> automatically calculated. When automatically calculated: does anyone knows
>>> what is the logic used for setting the values? Twice the average of
>>> previous periods?
>>>
>>>
>>>
>>>
>>> _______________________________________________
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>>>
>>
>>
>> --
>> Prosper Behumbiize, MPH
>> Phone:        +256 414 320076
>> Cell:             +256 772 139037
>>                      +256 752 751776
>>
>>
>
>
> _______________________________________________
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>
>


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