The package includes a simulated dataset based on the TOIB study, a comprehensive cohort study aiming to determine whether to advice older adults with chronic knee pain to apply either topical or oral non-steroidal anti-inflammatory drugs (NSAIDs) for knee pain management. The dataset include 563 observations with outcome $Y$ as Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) pain score ($0-100$) at 12 months. Some outcome observations might be missing (denoted as NA in $Y$). Column $M$ is a outcome missingness indicator: $1$ if $Y$ is observed, $0$ if $Y$ is missing. Other variables in the dataset include $t$ the treatment indicator ($1$ for topical NSAIDs, $0$ for oral NSAIDs), and $R$ the randomization consent indicator ($1$ for RCT, $0$ for OBS). Rest of the columns are baseline covariates (age, baseline WOMAC pain score, expected pain one year later, chronic pain grade).
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