my test also shows that only the min/max across all values of an org unit is use for setting mix/max. As this is unlikely to change any soon, I just want to understand if I can set the min/max values based on my own logic, and then inject it via the API.
*Rodolfo Meliá* *Principal | *[email protected] Skype: rod.melia | +44 777 576 4090 | +1 708 872 7636 www.knowming.com On Mon, Apr 20, 2015 at 2:14 PM, Jason Pickering < [email protected]> wrote: > HI, > > I think as Prosper says, it is simply the overall max and min, and this > can be set by the user, or calculated externally. > > Calle, use of standard deviation is problematic for several reasons > however, mostly because it makes an assumption that the data is actually > normally distributed, which is not really always the case. This may be > appropriate for some data elements, but in many cases, it is not an > appropriate statistical assumption, and results which we have seen after > often zero inflated or follow something more like a logistical distribution > (as opposed to a normal distribution). So applying something like a > standard deviation may (and does in the case of DHIS2) result in many > negative min values. So, although I think the method of DHIS 1.4 may be > somewhat better, it still is not really always appropriate, as the > assumption of a normal distribution is simply not always warranted. > > Regards, > Jason > > > > On Mon, Apr 20, 2015 at 3:02 PM Calle Hedberg <[email protected]> > wrote: > >> 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 <[email protected]> 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 | *[email protected] >>> 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 <[email protected]> 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 <[email protected]> >>>> 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? >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Mailing list: https://launchpad.net/~dhis2-users >>>>> Post to : [email protected] >>>>> Unsubscribe : https://launchpad.net/~dhis2-users >>>>> More help : https://help.launchpad.net/ListHelp >>>>> >>>>> >>>> >>>> >>>> -- >>>> Prosper Behumbiize, MPH >>>> Phone: +256 414 320076 >>>> Cell: +256 772 139037 >>>> +256 752 751776 >>>> >>>> >>> >>> >>> _______________________________________________ >>> >> Mailing list: https://launchpad.net/~dhis2-devs >>> Post to : [email protected] >>> Unsubscribe : https://launchpad.net/~dhis2-devs >>> >> More help : https://help.launchpad.net/ListHelp >>> >>> >> >> >> -- >> >> ******************************************* >> >> Calle Hedberg >> >> 46D Alma Road, 7700 Rosebank, SOUTH AFRICA >> >> Tel/fax (home): +27-21-685-6472 >> >> Cell: +27-82-853-5352 >> >> Iridium SatPhone: +8816-315-19274 >> >> Email: [email protected] >> >> Skype: calle_hedberg >> >> ******************************************* >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~dhis2-devs >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~dhis2-devs >> More help : https://help.launchpad.net/ListHelp >> >
_______________________________________________ Mailing list: https://launchpad.net/~dhis2-devs Post to : [email protected] Unsubscribe : https://launchpad.net/~dhis2-devs More help : https://help.launchpad.net/ListHelp
