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Sensitivity analysis:Sensitivity of my regression model to varying...

Hi Statalisters, I want to find out how sensitive the results of my logistic model (or the outputs) are to varying subsamples/ sample sizes) within my data set. Sample data set by "dataex". My outcome...

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Compare the median time between two groups

Hi All, How to compare the median time between the HIV+ve (-ve) in group A with HIV+ve (-ve) in group B HIV +ve HIV-ve A 10.17 12.5 B 14.16 21.85 Thanks in advance.

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How to partially differentiate a normalised quadratic profit function?

I am using nl in Stata 14.0 to estimate a normalised quadratic profit function: nl (norm_profit ={b0}+{b1}*norm_penergy+{b2}*norm_w+{b3}*norm_r+0. 5*{b11}*norm_penergy^2+{b12}*norm_penergy*norm_w+{...

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Correct Implementation of "If" "|" and...

Hello, So this my scenario: Respondents of a survey were asked to state their level of acceptance for a certain scenario on a 1 to 8 scale (in which 1=low acceptance and 8=high acceptance). If...

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Cut-points for continuous variables using information from regression models

Hi Statlisters, I am finding different methods cited in the literature to categorize a continuous variable (cumulative life time measure of alcohol consumed, tobacco smoked etc) , e.g, using smoothing...

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Factor Analysis - kick out 1 of the 2 remaining factors?

Hey guys, I have a question concerning factor analysis in Stata. It's not really about the implementation but about how to interpret results/ work with them. if after a FA (and rotation of factors) I...

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Command for calculating the mean for 5 year periods in panel data

Dear Stata specialists I am quite a rookie at Stata. I want to summarize my data into 5 year periods. I have a data set with over 120 countries and my time period is from 1980 to 2010. Now I want to...

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lgraph appearing with misplaced 'y'-labels / 'x'-labels

Dear all, I often use 'lgraph' for having a quick look of the trends in my long-format datasets. 'lgraph' is a user written program by Timothy Mark, and the program is avaialble through 'ssc install'....

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Converting variable "Date" from string to numeric

Hello Forum: I have a variable named Date and in string format, displayed in the Data Editor as: Date Q1 2001 Q2 2001 Q3 2001 Q4 2001 .... Q1 2017 Q2 2017 Q3 2017 Q4 2017 Its type and format are str263...

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Issues with missing data, N, Cox models

I'm trying to get an article published which attempts to assess if there was a higher risk of a condition lasting longer in a year when compared to a previous year. I sincerely appreciate any help you...

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forvalues: Merging panel datasets

I have two panel datasets (1StartFile.dta and 2StartFile.dta). In each of them id identifies at most one observation per quarter (between 1q06 and 2q12). To merge these datasets, I am trying to (i)...

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Graph histogram center bars on labels

Hello everyone I am having trouble with the command "twoway histogram varname as I want to align bars of histogram centered on labels but can't find how to do it. Thank you

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graph Catplot percentage bars

Dear everyone, I am trying to use SSC catplot in order to plot a categorical variable (Speed, divided binary into Fast-Low) over five years but can't manage to make it sum up 100% on each year. See...

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Propensity score methods for dichotomous (binary) outcome (OR adjustment)

Dear all! I am a novice STATA user and I understood propensity score method for ATE and ATT estimating for continuous outcome (great thanks for Melissa Garrido for article «Methods for Constructing and...

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Cubic Splines

I am running an analysis looking at the relationship between measles mortality (outcome) and vaccine coverage (independent variable). I have fitted a cubic spline with knots at 0, 33.5 and 88 and the...

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Propensity score match under conditions

Hi, I am using Stata 13 and use teffects psmatch to undergoe propensity score matching. My question is the following: Can I restrict a matching on certain conditions? Here is an example: Code: clear...

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two part model for health expenditure

Hello everybody, I have health expenditure as DV and demographics as IV. I want to run two part model with logit plus OLS log-trasnformed y and Duan's non-parametric smearing factor. I have tried the...

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How to extract hazard functions

I need to predict hazard functions with confidence intervals and I have tried many different ways without success. I have created a graph but I need the functions for each spline in numbers to be able...

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Calculating the ICC for between class variance after imputation

Hi to everyone, I have a problem with my imputated dataset. I successfully imputated the values for 32 items (around 10% of the data was missing before) (m=5). Since the data structure contains...

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T-test table using a macro - variable not found?

Hi all, I'm trying to make a t-test table showing: Group 1 Group 2 Difference T-test p-value I'm using the following program: capt prog drop myttests *! version 1.0.0 14aug2007 Ben Jann program...

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