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Use this tag to discuss empirical papers and issues arising when applying theoretical models to data. For theoretical econometric issues, use the `econometrics` tag
0
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1
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Is there any special reason to use the character "k" standing for the "early"?
From the paper of Bacon,2018, p.5, I saw a paragraph as below
The simplest way to illustrate how treatment timing works is to
consider a balanced panel dataset with 𝑇 periods (𝑡) and 𝑁
cross-secti …
0
votes
1
answer
27
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Why joint null test have less power when there are more coefficients involve?
From a description of DiD method of Borusyak,2020 , I saw that
pretrends(integer): if some value k>0 is specified, the command will
performs a test for parallel trends, by a separate regression on
no …
2
votes
1
answer
728
views
Why the larger the sample, the lower standard deviation?
I concern about why country-level variables normally have higher standard deviation compared to that in firm-level variables.
Today, my senior friend told me that it seems to be because the firm-level …
0
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0
answers
35
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An ambiguous description in Dasgupta, 2019 regarding the coefficients and choosing baseline ...
Regarding the result table of Dasgupta, 2019, table 3, p.2601, where they examine the impact of anticollusion on asset growth
However, they describe that
The dependent variable is the annual asset g …
4
votes
2
answers
1k
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Why we need at least 40 groups to be properly clustered?
From this discussion, I deem that we need approximately 40 groups for clustering.
For example, if we want to clustered by industry, we need at least 40 industries, or if we want to cluster by year, we …
5
votes
1
answer
11k
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What are the main differences among xtreg, areg, reghdfe?
Normally, when I run regressions for panel data in Stata using these three commands (xtreg,areg, reghdfe), the results regarding the coefficients of variables are quite similar; the only differences a …