Conditional summation notation
Post date: 2020-08-01 11:00:48
Views: 516
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:
Our top 10 things to watch in the stock market Friday
Trump invokes Cold War-era Defense Production Act for oil production, refining
Etsy bans AI-generated recipes and patterns from its online marketplace
The Ultimate End All Be All of Final Girl Movies
Special Event: Fall 2026 Anime Season / Summer 2026 Wrap-Up
Special Event: Rifftrax: STREET FIGHTER
The Lowdown: Truth's Easy
Stocks open lower as oil tops $100 amid escalating Iran tensions: Live updates
Fewer people are flying as airfare soars. Here's why airlines aren't worried
Why investors are moving back into Treasurys