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Comparing User-Written Codes for Performing Economic Evaluations in Stata
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DOI：10.1007/s40273-026-01643-y.png)
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Abstract
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Several user-written Stata codes exist for trial-based economic evaluations, but they lack assessment and guidance. This study aimed to identify and compare publicly available user-written Stata codes for trial-based economic evaluations. A focused literature search of Ovid Medline, SSC Archive, The Stata Journal and Google Scholar was conducted to identify relevant codes to June 2025. Codes were applied to data from two clinical trials, both featuring missing data and covariate adjustment. Codes were compared in terms of their ability to estimate key economic parameters and produce graphical outputs and functionality in handling four common statistical challenges: correlated costs and effects, covariate adjustment, skewed costs and effects, and missing data. We identified eight codes reported in four publications: codes for assessing health economic agreement (Gallacher et al.), sampling uncertainty for cost-effectiveness analysis (Glick et al.) and codes addressing missing data (Mutubuki et al. and Faria et al.). Gallacher et al.’s codes reported lower incremental quality-adjusted life years (QALYs) and net monetary benefit than Glick’s et al.’s codes. Mutubuki et al. and Faria et al.’s codes produced comparable incremental costs and QALYs, though Faria et al. yielded wider confidence intervals in cost estimates. Differences in estimates across statistical approaches show that code choice can influence economic evaluation results. Some codes were better suited for generating basic economic outputs, whereas others provide more comprehensive analyses or address specific statistical challenges including missing data. However, no single code provided all key outputs while addressing the main statistical challenges.
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