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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 votes
1 answer
26 views

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 …
Phil Nguyen's user avatar
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0 votes
1 answer
27 views

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 …
Phil Nguyen's user avatar
  • 1,170
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 …
Phil Nguyen's user avatar
  • 1,170
0 votes
0 answers
35 views

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 …
Phil Nguyen's user avatar
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4 votes
2 answers
1k views

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 …
Phil Nguyen's user avatar
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5 votes
1 answer
11k views

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 …
Phil Nguyen's user avatar
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