Dropping groups of observations conditioned on an "if" statement.

Hello, I am trying to get rid of observations from gvkey where fyear does not include either 2014 or 2015. This happens at gvkey: "01...

Estamating standard errors in Finance Panel Data Sets

Dear Stata users, I'm dealing with an unbalanced panel dataset of many individuals over two years, my purpose is to study the determina...

Warning:Variance matrix is non-symmetric or highly singular *NO DUMMY VARIABLES*

Dear Statlisters, I am estimating a demand system with 4 goods, usingthe aidsills command, using Stata 14. The estimations run smooth wh...

dividing variables by row

hi! I want to devide two variables on each row in the dataset. e.g. row1 variable 1 / variable 2 row2 variable 1 / variable 2 row3 vari...

compare value different variables and rows

hello, I want to compare values of two variable in different rows. For example vr1 vr2 10 20 20 30 40 50 the vr1 has the value 20for...

Scalars missing in output of esttab

Hello, I have a question about esttab and more precisely to add scalars. I start with a spatial model (for this first estimation, all my...

Help with R squared in Cox model with shared frailty

Hi all, I am fitting a Cox model with shared frailty and I hope to get the (pseudo) R squared for my model. Here is my code: stcox x1 x2...