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Survival Analysis in Stata

Cheat-sheet DETAILS A Key concept in survival analysis is ANALYSIS TIME. All analyses are performed in terms of time since becoming at risk, called analysis time. Subjects are exposed at t = time = 0 and later fail. Observations with t = time <= 0 are ignored because information before

Deviance and Deviance ratio in Logistic models

Once you start using logistic regression and have come beyond the basic model, you will start going into model diagnostics and comparison of model performances across various peculations for a specific outcome. you will then start coming across concepts of deviance and deviance ratios. Let us understand briefly, how to

Stata customised tables of Regression results

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Stata added collect and enable suite of commands. I am discovering them now having migrated to Stata 18 from Stata 15. Useful Links Sample Output for etable using Collect suite SAMPLE OUTPUT for Collect

LASSO in Stata

Crossvaldiation By default, stata will select model with highest lambda. By default, stata fits up to 100 models with varying lambdas. The model with largest out of sample r-square and minimum CV mean prediction error gets selected by cross-validation LASSO commands SSC Addons based methods Stabdard Lasso estimation commands Lasso

Stata and ML resources

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Some links to Stata and ML resources Conference Articles / Presentations / Stata Journal Stata Blog Articles from 2020 Other Resources Seven Steps in developing a prediction model Source: Towards better clinical prediction models: seven steps for development and an ABCD for validation - PMC (nih.gov)

Compact Results of Logistic Regression in Stata using ‘estout’ – ‘logisticresults’

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After running a logistic regression in Stata, for inclusion in classical tables, one needs the Odds ratios and 95% confidence intervals. I have developed a small code snippet for getting reasonably compact unstyled results that can be easily copy-pasted in word or excel. This actts as a thin wrapper for

February 20, 2024

Easily get gender wise results of binary outcomes after survey data analysis in Stata

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Problem Statement: You have a survey data and you wish to summarize your prevalence by gender Prerequisites: Stata Code Result You will get the outcome variable name in first column, male total, male %(95% CI), female total, female % (95%CI), total number, total % (95% CI). This can be copied

February 16, 2024

Generate EQ-5D-5L Utility Scores Indian norms

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BASED ON Development of an EQ-5D Value Set for India Using an Extended Design (DEVINE) Study: The Indian 5-Level Version EQ-5D Value Set. Gaurav Jyani MPH 1, Atul Sharma PhD 1, Shankar Prinja MD 1, Sitanshu Sekhar Kar MD 2, Mayur Trivedi PhD 3, Binod Kumar Patro MD 4, Aarti

January 18, 2024

Stata Code for generating corneal opacity outcomes from RAAB 6 surveys

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Corneal Opacity Related Outcomes There are four sets of variables Stata Code The above Stata code can be used by anyone under a CC-BY-SA license.

January 12, 2024

Stata Graph Colors

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Install the packages contributed by Ben Jann: here and here in the Stata Journal. Initialize and set the preferred graph schemes. Here I am setting plain background with dotted grid and legend without any box at 2 o-clock inside graph region. Detailed help for grstyle is there. Assigning Colors Examples