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diffindiff
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DIFF command results interpretation
I ran a differenceindifferences model using the command DIFF (Villa, 2016) in Stata/IC 15.1 for Windows on a sample of 726 firmyears. The command I...Last edited by Cyril Bergovic; 01 Aug 2019, 04:04.
 3 posts

Parallel trend assumption using leads and lags
I am running some robustness checks to my diffindiff specification. In particular, I am trying to check if the parallel trend assumption is satisfied....
 1 post

State specific linear trends
I want to run a diffindiff model including statespecific linear trends. The code I am currently running is the following
Code:preserve
 3 posts

Plotting pretreatment parallel trend
I am trying to draw a common pretrend graph for a diffindiff design. My treatment group is made of one only state, while the control group is made...
 1 post

Aggregating units in a control group
I am trying to draw a common pretrend graph for a diffindiff design. My treatment group is made of one only state, while the control group is made...
 1 post

Diffindiff with matching
Hello, I am working on a project which uses diffindiff with propensity score matching techniques using repeated crosssectional data and was curious...Last edited by Girija Bahety; 15 Apr 2019, 07:21.
 2 posts

Fabio Martinenghi started a topic margins coeflegend difficult to understand with 2way interaction and at()in Generalmargins coeflegend difficult to understand with 2way interaction and at()
Dear Statalisters,
I am trying to do a number of things with this regression: run a diffindiff
 in a logit model
 in a survival analysis
Last edited by Fabio Martinenghi; 22 Mar 2019, 05:14.
 5 posts

testing coefficients within groups after a PSM diffindiff
I'm using Stata 14 with Windows 10 OS.
I'm running PSM diffindiff using command diff. I'd like to test if for the same group, that was...
 1 post

diff in diff, unbalanced panel data re election years
Hello! I am trying to do a diff in diff with fixed effects on unbalanced panel data. My dependent variable is individual contributions to statelevel...
 3 posts

Interpretation of natural logarithm in model
Hello,
I am working on two DiDmodels in stata, one where the dependent variable is sales, and one where it is the natural logarithm of sales....Last edited by Milla Hanzon; 09 Nov 2018, 01:42.
 6 posts

Joe Sch started a topic How to after test certain characteristics across different subgroups in a diffindiff analysis with multiple interaction termsin GeneralHow to after test certain characteristics across different subgroups in a diffindiff analysis with multiple interaction terms
Hi,
I have a question as to how to run a test in Stata to determine whether a number of subgroups in diffindiff regression are different,...
 4 posts

Diffindiff with multiple treatment groups
Hello,
I am working with a set of 62 million transactions for 8 different grocery stores from the same chain spread across the country....Last edited by Milla Hanzon; 11 Sep 2018, 10:59.
 2 posts

Failing Common Trend Assumption testing
Dear Statslisters
I'm currently doing a DiffinDiff analysis if the access to micro credit programs helps children of those families spend...
 12 posts

Diffindiff with mergers/acquisitions
Hi all,
I would like to run a diffindiff in order to study the effects of acquisitions on some firms performance. I have data on efficiency...
 2 posts

Difference in difference with different start of treatment
I am running a DiD model for 20 companies in the treatment and 35 in the control. The time goes from 1960 to 2010 and the treatment started for most companies...
 2 posts