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statistical power

Yikes, not only is it hard for us to do experiments with firms, it can be really hard for firms to experiment on themselves

David McKenzie's picture

I came across a new working paper written by researchers at Google and Microsoft with the title “on the near impossibility of measuring the returns to advertising”. They begin by noting the astounding statistic that annual US advertising revenue is $173 billion, or about $500 per American per year. That’s right, more than the GDP per capita of countries like Burundi, Madagascar and Eritrea is spent just on advertising!

A Curated List of Our Postings on Technical Topics – Your One-Stop Shop for Methodology

David McKenzie's picture

Rather than the usual list of Friday links, this week I thought I’d follow up on our post by Guido Imbens yesterday on clustering and post earlier this week by Dave Evans on Hawthorne effects with a curated list of our technical postings, to serve as a one-stop shop for your technical reading.

Does Business Training Work?

Markus Goldstein's picture

What do we really know about how to build business capacity?    A nice new paper by David McKenzie and Chris Woodruff takes a look at the evidence on business training programs – one of the more common tools used to build up small and medium enterprises.   They do some work to make the papers somewhat comparable and this helps us to add up the totality of the lessons.   What’s more, as David and Chris go through the evidence, they come up with a lot of interestin

When Randomization Goes Wrong...

Berk Ozler's picture

An important, and stressful, part of the job when conducting studies in the field is managing the number of things that do not go according to plan. Markus, in his series of field notes, has written about these (see, for example, here and here) roller coaster rides we call impact evaluations.