# Tag Info

### Matching unpopularity

It's not true that "no-one uses matching these days". It's a bit too definitive. For example, see Bilicka (2019) who recently published in the American Economic Review. I am sure it's ...
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### Is there any intuitive example for multi-valued treatment?

In a standard treatment effects set up there are only two options to compare: Either the subject is treated or the subject is non-treated. Multi-valued treatment happens when subjects are not only ...
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### Articles on the definition of causality in Economics

As 1muflon1 said, the concept of causality in economics is intertwined with the concept of causality in other sciences, in particular statistic and econometrics, and the concept of probabilistic ...
• 4,122
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### Difference in differences with one post and two treatment variables

Let $x_{it}$ denote after rejection, $z_{it}$ denote after granted, $y_{it}$ the outcome, and $w_i$ is US origin (which should not change over time and doesn't have a $t$ subscript). The two-way fixed ...
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### IV estimate for entire sample is larger than IV estimates for subsets of sample?

In general regression coefficients obtained from a regression on the entire sample need not be equal to the mean of the coefficients obtained from regressions on the subgroups of the sample. I will ...
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### Imbens and Angrist (1994): the $D_i(z)$ variables

I hope this meets your idea for intuition, but equation 1 comes from using the Law of Total Expectation with the independence condition (Condition 1). There are four possible values of $D_i(z)-D_i(w)$....

### Synthetic control question on donors

Welcome. Do you mean: if $x^*_{k,it}$ are the panel variables, then $x_{1,i} = \min_t x^*_{1,it}$, $x_{2,i} = \max_t x^*_{2,it}$, etc.? Usually people use averages over time or values at certain ...
• 2,114
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### Asking for the definition of various types of treatment?

"From my understanding," treatment is simultaneous" is that all countries passed a law at the same time, is this correct?" Yes. And what is multiple treatment events can happen in ...
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