Calculating a mean within a time period
Dear Statalist members, I have a data sample in which I want to calculate the mean (among other things) within a time window of 1.5 years before and 1.5 years after the announcement date. The...
View ArticleCombining specific observations
Hello everyone, I have a panel dataset containing trade data for 85 countries, across 16 years with around 12-15 variables (continuous and indicator). I wanted to combine observations for 10 specific...
View ArticleDifference in differences for binary outcome
Dear all, I´m working with pooled cross-section data based on a survey. I aim to examine the effect of a policy on the employment rate of a targeted group. So I run the following probit regression...
View ArticleOverall p-value in independent categorical variable in the imputation model
Dear all, I've been trying for several weeks no to find a way of getting an overall p-value on a categorical variable in a multiple imputation model. In the "normal model" the testparm command just...
View ArticlePlacebo Tests for Synthetic Control Method.
Hello everyone, I am running the synthetic control method on Stata 13 using the codes provided by the authors (website: http://web.stanford.edu/~jhain/synthpage.html) and the help synth command in...
View ArticleInter-rater ICC problems
Hello ! For a reliability study, 10 patients are evaluated by 4 raters one week apart so that I can calculate one intra-rater ICC; but as there is 2 visits, in order to calculate one inter rater ICC,...
View ArticleTesting for autocorrelation in a two-way linear panel data model
Dear all, I am conducting a study on a long panel using a two-way fixed effect model, that is including both country and time fixed effects. After estimation, I get that time fixed effects are highly...
View ArticleLinear time trend
Dear all, I have data on the 2nd quarter from 1999 to 2008.I want to create a linear time trend, I tried with gen Trend=_n but I´m not sure if it is right. Thanks!
View ArticleFilling-in variable's missing values with the average of few variable's...
HI I have the dataset counting 161 observations. The dataset looks as following: ID_2 NAME_2 innovation 31462 Region 1 .3636364 31463 Region 2 .25 31464 Region 3 .4 31465 Region 4 .1428571 31466 Region...
View Articleinterquartile range for two-way fixed effect model
Dear all, I was wondering whether it makes any sense to report the inter-quartile range for the model that exploits within-variation (in two-way fixed effect model). Does it provide any additional...
View ArticleImporting C code in Stata and Nonlinear optimization
Dear Statalist, I am trying to import some C code from the NLopt library (http://ab-initio.mit.edu/wiki/index.php/NLopt) into Stata. I followed this tutorial (http://www.stata.com/plugins/) to create...
View ArticlePassing saved matrix name to mata from stata
Dear fellow Mata enthusiasts -- I have the following seemingly simple problem for which I can find no workaround. The problem involves passing a local to Mata from Stata, where the local contains the...
View Articleproblems with mlmatbysum in a method d2 ml estimator for panel data
dear stata list readers, especially dear experts on ml estimation in stata. I am estimating a random effects model with one nonlinear parameter wherefore I need to program my own estimator. Fortunately...
View ArticleWait, Stata!
I am producing some data with matlab, once it is finished I want stata to start and pick up the result and calculate further. I am aware of the "sleep" command. Hence, I could guess how long matlab...
View ArticleFactor analysis on a panel dataset -- problem with i.i.d. ?
My colleagues and I are in the process of reviewing the methodology of our Index and as part of that we are exploring using principle component analysis to weight the variables that we have in the...
View ArticleAlternative to signrank when distribtion is not symmetric
I have data from the lab where participants chose a probability from 0% to 100%. The theoretical optimum is at 0%, obviously you cannot have a symmetric distribution around 0%. I want to prove that...
View ArticleHow does -project- handle breaks?
I am using Stata 13.1 on Unix. I am also using the user written command project, version 1.3.1 22dec2013 My project takes a long time to run, so I like to use Unix's mail capabilities to send me an...
View ArticleHow to count the number of business segments in Stata? How to write the code?...
Hi: My data comes from WRDS and my research question is about gender diversity and firm performance. My data is 7 years panel data(from 2007 to 2013) and I use fixed effect to run the regression. I use...
View ArticleTimes series regressors in panel data regressions
I have a very general econometrics concern: Why when it comes to investigating the effect of (multiple) time series variables on average market figures (like returns, turnovers,...), it is common to...
View ArticleStata slow in a distributed environment
Hello – I am not a Stata user, but am trying to help someone who is. We recently migrated to a virtual environment (VM) where Stata (Windows v 12) runs on a remote (and geographically distant) network...
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