Conditional summation notation
Post date: 2020-08-01 11:00:48
Views: 327
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:
Not really a fan of nature, are you?
Movie: The Odyssey
Economic outlook is worsening and Trump is getting blamed, CNBC survey finds
Here’s the inflation breakdown for June 2026 — in one chart
Jim Cramer says concerns about AI market froth are overblown. Here's why
Bipartisan group of senators propose Social Security reform process ahead of funding shortfall
Social Security cost-of-living adjustment estimate for 2027 falls as inflation cools
IBM stock craters 25%, the worst day on record, after company issues second-quarter earnings warning
Warren Buffett is accelerating his charitable donations with aim to give away Berkshire wealth by 2034
Johnson & Johnson has a chance to show it's more than just a rotation winner