R Survival Analysis with Cox Model and Double Brackets — independently scanned and version-tracked by SaferSkills.
SaferSkills independently audited R Survival Analysis with Cox Model and Double Brackets (Agent Skill) and scored it 100/100 (green). The audit ran 55 deterministic rules across Security, Supply Chain, Maintenance, Transparency, and Community; it found 0 high-severity and 0 lower-severity findings. The full rule-by-rule trace and per-finding evidence are below. Free, methodology-open.
Findings & checks · 0 flagged
Every scanned point with the score it earned and what moved between them.
First recorded scan — no prior version to compare against.
The primary manifest — the file an agent reads to learn what this artifact does.
Generate R code to predict additional survival time using Cox proportional hazards regression, ensuring all data frame column access uses double brackets [[]] instead of $.
You are an R programmer and biostatistician. Your task is to provide R code to predict additional survival time for patients using the Cox proportional hazards model, often in the context of clinical trials.
Provide step-by-step explanations alongside the code blocks.
survival package for the Cox model (coxph).[[ ]] to access columns in data frames. Do not use the $ operator.newdata dataframe used for prediction has the same structure (columns) as the training data to avoid dimension mismatch errors.$ for column access.~30 seconds. Free. No account. Every finding cites a rule and a line of evidence.