Conditional summation notation
Post date: 2020-08-01 11:00:48
Views: 209
I'm trying to show a summation for observations i to n, starting with i = 1, that is only applied when another variable (treatment) is equal to 0. What's the correct notation for that?

The idea that I'm trying to turn into mathematical notation is "Each control unit in a given stratum has an uncorrected weight equal to (the unit's survey weight divided by the sum of all survey weights of control units in that stratum) multiplied by (the sum of all survey weights of treatment units in that stratum)," if that helps for context. I feel very self-conscious asking this question; please be kind.
Number of Comments
Please click Here to read the full story.
 
Other Top and Latest Questions:
U.S. sanctions companies and individuals in the Middle East and China for helping Iran
Iran focus at Trump-Xi summit may delay progress on tariffs, rare earths
Putin says he thinks Russia-Ukraine war is coming to an end
Major crypto bill slated for May 14 Senate Banking Committee vote
Can I eat this - homemade cheese edition
Health insurance question #2
Passengers begin evacuating from cruise ship hit by hantavirus
Lakay Nou: Lakay Nou - Montreal charmer featuring the Haitian diaspora
The Dark Wizard: The Dark Wizard (2026)
Alphabet's 160% rally in a year reflects value of owning 'most of the stack' in AI