The way I read this post is, "Progressive educators have completely dismissed ED Hirsch as a right-wing whackadoodle. But I really find some of his ideas very compelling and handwaving isn't really sufficient. These are ideas that you should be wrestling with, whether you agree or disagree."
It's amazing to me how much variation there is amongst practitioners and researchers on the right approaches here.
So the fastest way to do something like remove any repeated observation of a particular individual but the most recent, I use something like this:
dt[,subset(.SD, date==max(date)), by=id]
but that's very slow.
Any ideas on how to speed this up? I know that using .SD is slow, then I layered on vector scan and I may as well not be using data.table.
The example in the documentation of a nested query by group is promising (DT[,.SD[which.min(v)],by=x]), except that the which.max and which.min functions behave like crap when you don't want to arbitrarily select one observation when they have the same value.
Anyway, I've long known that Brown spend substantially more per student than even the sticker price (that hardly anyone pays). This chart shows just how powerful endowments and fundraising are for impacting the college experience.
- Annenberg Institute of School Reform and Providence Public SchoolsHarvard Strategic Data Fellow, 2012 - present
- Rhode Island Department of EducationResearch Specialist, 2010 - 2012
- Brown UniversityUrban Education Policy, 2009 - 2010
- Brown UniversityChemistry, 2005 - 2009
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