Weight to multiple target characteristics

Weight to multiple target characteristics

The weighting examples above are applicable when you only want to apply one weight scheme to the project at a time. However, you might want to weight to multiple target characteristics. We can do this using Random Iterative Method (RIM) weighting.

For example, a survey sample may have set quotas to equally sample physicians and nurses , but in the target market nurses may be 70% of customers.

Similarly, the distribution of region in the survey may differ from the target population.

It is possible to calculate one weight scheme that adjusts the distribution for more than one variable.  This is a little more complex, as setting weights for one variable may affect the distribution of other correlated variables.   

For this you can use an iterative algorithm called "Rim weighting", described , described here https://gist.github.com/pietersv/2855695b0c4f79a8ce242f14655a8adc.  This gist shows a function that calculates weights for selected variables, and runs in a  data process .