Category Combos are the result of combining various categories, like Sex and Age Groups, to create a new set of combinations.
In the example of Sex and Age Groups, if sex has 2 values, and Age Group 4 values, we end up with 8 cat combos. For data entry, they will render as 8 columns.
Cat combos can also be used as an attribute on a Data Set or Program. It will render as one or more dropdown for the user to select before the data collection form loads.
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Number of combinations
When creating combinations you need to ensure that the resulting number of combinations is a reasonable number. The table below explains the recommended limites. If you generate more that the recommended number of combinations, the resulting number of combinations, which can easily move in the millions, will slow the system, be unusable, and will require a considerable level of effort for removal.
Rendering | Recommended maximum number of members | |
|---|---|---|
How does the user sees it | Resulting combinations: multiply the number of category options in each category | |
As disaggregations | Renders as columns on a Dataset | Standard Dataset: no more than 15 |
As attribute | Renders as one or varios drop downs at the top of the dataset or program. User need to select a combination before the form loads | No more than 5,000. Example = 20 x 75 = 1,500 cat combos. |
User Role to create and maintain category combos.
The assignment of the authority to crate and maintain category combinations is heavily restricted at PSI. Users are given access to this authority after individual assessment of their DHIS2 and systems knowledge. The reason is its incorrect use will generate a significant amount of maintenance for removal of inappropriate combination, beside slowing down the system on a significant way.
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