Is it better to calculate KPIs from a script level and store KPIs in a fact table OR calculate KPIs inside UI using Set Analysis ?
KPI is an expression / formula used to calculate a value that usually change when the user click (filter)
IMHO better to define it in the user interface as an expression
Dimensions and Measures
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Well, generically speaking, I would recommend to store KPIs in the script level - for example, in a qvd layer - and then use it when you load the script of your qvw dashboard.
Nevertheless, if the amount of data is not relevant, it should be fine using set analysis.