36 About data dimensions

36.1 Data dimensions: Core building blocks in DHIS2

A data value in DHIS2 is described by at least three dimensions: 1) data element, 2) organisation unit, and 3) period. These dimensions form the core building blocks of the data model.

As an example, if you want to know how many children that were immunised for measles in Gerehun CHC in December 2014, the three dimensions which describe that value are the data element “Measles doses given”, the organisation unit “Gerehun CHC”, and the period “December 2014”. All data values have at least these three dimensions describing what, where, and when.

In addition to the data element, organisation unit, and period dimensions, data values may also be associated with additional data dimensions. A common use of this feature is to describe data values which are reported by multiple partners in the same location for the same data element and time period. In principle, it can be used as a “free-form” dimension, to describe multiple observations of the same phenomena at the same place and time. For more information about this, see Chapter 34: Additional data dimensions.

Organisation Unit Data Element Period Value
Gerehun CHC Measles doses given Dec-09 22
Tugbebu CHP Measles doses given Dec-09 18