A simplified notation for OLS regression
A simplified regression notation
Blog posts
2021
2020
On picking the Viridis color scheme
The economist meets visual arts
Goalkeepers, random play and multiple testing
Random action may be a well thought out strategy. Sometimes you would want to act randomly to make your next action hard to predict. This is particularly imp...
Selection bias – a war story
During the Second World War, in a secret Manhattan building, statisticians and mathematicians were recruited from across the U.S.A. to carry out data analysi...
Comparing data from two different sources
Suppose you have data, but with many missing observations. You find a new data source that overlaps but has the potential for new observations or new values....
Some history of sampling
Statistical enumerations of land, people, and property have taken place in many of the better organized empires and states since Babylonian times. These all ...
ATE vs ATET: when should be care about them?
In Chapters 19, 21, and 22 we talk about both the average treatment effect (ATE) and the average treatment effect on the treated (ATET). We discuss how to c...
Variants of random sampling
There are many variations on random sampling that aim to further improve representation or reduce the costs of data collection.