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  "Title": "Improved Methods for Survival Analysis under Double Truncation",
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  "Description": "Contains existing and novel methods for nonparametric\nanalysis and Cox regression analysis with doubly truncated\nsurvival data, as described in Vazquez and Xie (2025)\n<doi:10.1007/s10985-025-09650-5>. Includes survival curves and\nhazard estimates through nonparametric maximum likelihood\nestimation, various tests for detecting group differences or\nnon-ignorable sampling bias, and inverse probability weighted\nCox regression with several options of nonparametric weights.\nAlso implements diagnostics for key modeling assumptions such\nas quasi-independent truncation and the positivity assumption.\nClosed-form standard errors are available for all estimates,\ni.e. bootstrapping is not required.",
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      "title": "Cox regression under quasi-independent double truncation.",
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