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...

Tabulation of percentages for an outcome variable by gender for each racial group

Hi, I would please like some help with a tabulation issue I am having. So, I have about 10 causes of death and I would like the percentages...

How to add multiple regression lines to a marginsplot graph?

Hello, I would like to use marginsplot to show many regressions on the same graph. My dependent variable is a scale (0, .5,1, 1.5, 2, 2.5,...

Crosstabulation Question: Options row vs. col

I know this is a really basic question, but the logic confuses me every time I do crosstabs - even within a few weeks of the last time I did...

Which is the correct approach in coding a dummy variable

Hi Statalist. I want to generated a dummy variable from a categorical variable with values ranging '0-10'. The range '0-2'...

Knots in Non parametric series regression

Dear All, I am Maheswaran Kesavan doing masters in University college London. I am doing an Non parametric series regression using B spl...

Predict based on regression model

Hi, I estimated on the regression model: Code: reg lnChild lnCash lnWhite lnCash*lnWhite Based on this regression, I want to predict ...

ICC (Intra-class correlation coefficient) vs "9% of this variation in mortality was attributable solely to the surgeon."

I am trying to find out the relationship between a. the ICC for surgeons and the b. the variation due to surgeons. In Udyavar,2018 (The imp...

power analysis for modified poisson regression

Hello, I am trying to determine the power of one my analyses. The outcome is binary and relative risk if the effect estimate, determined u...

"Not sorted"

Dear All, I have individual level panel data that includes spells, with a 6 month *follow up* period after each spell as follows: Code: ...

initial values not feasible melogit

Hello -- I am running an melogit on a 330,000 person nested in ~1900 neighborhoods in 47 countries. For my models, I keep getting "Init...

Comparing two datasets by two variables

Hi, I am very new to stata. I have x1, y1, z variables in data1.dta and x2, y2, N in data2.dta. I am trying to run an analysis where: Ste...

Log transforming variables

Two questions related to log transforming variables. I understand that we would want to log transform the dependent variable if normal dis...

How to assess if there is enough variation in your dependent variable

Is there a simple way to assess if there is enough variation in your dependent variable, or is it best to just run the regression and asses ...

Change in variance time series

Hi everyone, I am analysing a time series (stock returns) and I am trying to check whether variance in the second half of my sample is dif...

xtivreg , first failes with "conformability error" r(503)

Dear Readers xtivreg without "first" runs fine, but fails when I add the "first" option with "conformability erro...

Split String

Code: clear input HAVE WANT1 WANT2 AA01 AA 01 AZ02 AZ 02 AV03 AV 03 AA04 AA 04 AA05 AA 05 A06 A 06 A07 A 07 ...

New version of wridit on SSC

Thanks as always to Kit Baum, a new version of the wridit package is now available for download from SSC. In Stata, use the ssc command to...

compare value different variable and rows

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

table summarizing 3 categorical variables in string form between two groups (binary variable)

Hello, I am having a hard time finding examples of summary tables between two groups let's say students who dropped out vs those who d...

Combining two datasets and keeping specific observations

I have two datasets. Dataset A and Dataset B. Dataset A is my existing data that I have organized and cleaned. Data examples are given below...

Replacing values from one observation to another

Dear Statalist users, this may be a trivial question to you, but I am a little bit struggling to do this. My data are as this example ...

Fixed effects regression is doing something I'm not noticing?

In Stata I complete a fixed-effects conditional logistic regression model of a binary predictor (1==Unemployed | 0 ==Employed) on a binary o...

Interpreting stset- output

Hello, I use Stata 15.1 for survival analysis, using a Cox-model (stcox). My master dataset is the UCDP Peace Agreement Dataset V19.1, with...

Suest after fracreg

Hello all, This seems like a simple question. I wanted to compare coefficients from two models estimated using fracreg command (fraction...

reshaping complex panel data

[CODE] * Example generated by -dataex-. To install: ssc install dataex clear input str7 _AIHWperiod int SA3 str20 _AIHWgeoname str61 _AIH...

Logit model for estimate Demand (Berry 1944)

Hello everybody I have the following excercise to estimate Demand allowing for heterogeneal preference shocks : Supermarkets market Ti...

Deciding equation when analyzing by ppml

Hello My data is panel data with strongly balanced . As I want to know the effect of lpi on export and import I have chosen export and impo...

Non integer weights - problem

Hi. I'm using weights from the European social Survey which have three different weights: design, population and post estimation weight...

Mark Highest Recurring Observation

Dear All, Hope you are well. I am wanting to generate a variable that marks the highest recurring violation type for each business. Th...

How to make mother education variable for each observation in a large data

i have data in the form of Parent key KEY indvidual_number_ in_ roaster completed education mother line number in roaster PARENT_KEY KEY_...

How to use a Cox regression model for time-to-event analysis using different years as control

Good day Background: I am trying to conduct a retrospective epidemiological study looking at the incidence of a certain disease (on admis...

Redirecting All Ado Paths to New Drive & Folder

At some unfortunate time, I named my partitioned drive with the letter "B". I am setting up a new computer and IT requires me to u...

Time series operators not allowed?

Dear All, I would like to create a 5 month *follow up period* after a specific variable takes a value of 1. My data looks as follows: Co...

Dropping all companies with no observation at the start of the time period

Hi Statalist, I have a database of a lot of companies for 7 years: 01-2013 to 01-2019. However, in order to calculate certain variables, I...

Solve a system of equations

Hello everybody! I would like to solve in Stata ( or maybe Mata? I never used it) this system of equations: 99-x=(4999-y)*0.0198 99-x=(2...

I need help on merging two datasets.

Hello, I am having trouble merging two datasets for my thesis. To reduce clutter, I have only included 4 different variables. 'gvkey...

Choosing between OLS , RE, FE

Hello I am analyzing the effect of LPI on export and import trade ( using panel data) when I ran OLS, the result was below Code: . reg...

summarizing in Stata

Hi, I´m a rookie in using Stata and I am stuck at this point. I have an issue using the sum function. I have a data set of 1156 observations...

Comparing categorical variables over time in a randomised cluster trial

Good morning everyone, hope you're all well - and hope that you can help with some confusion. I have a dataset where I am looking at a...

Drop duplicate quarterly dates

Hi, I am working with a dataset which consisted of monthly obeservations of two variables m1 and m3. I have now converted these montly dat...

putexcel command - error

Hi all I have a question about the putexcel command. When I run the code, sometimes I get the following error message: file C:\...\rep...

Cumulative event duration with repeated events as a function of follow up time

Dear STATAlist I have a dataset with a starting date (different for each id), and different events which can occur repeatedly. What I am i...

Time specification

Dear colleagues, I am working on 15 years of repeated cross-sectional data. I was wondering whether it is an appropriate strategy to incl...

Fillin/expand with panel and different dates

Hi All, please, could someone help me? I have the data below: Code: * Example generated by -dataex-. To install: ssc install dataex clea...

Inclusion of both Age and Time Indicators in Panel Data Analysis

Dear Colleagues, I am analyzing a panel data that collects information on children every two years since 2010, so the panel data has a tot...