高校数学の質問スレ（医者・東大卒専用） Part438

高校数学の質問スレ（医者・東大卒専用） Part438 (893ﾚｽ)
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828:  [sage] 2025/05/05(月) 19:09:02.55 ID:LDY1RQtT

Details:

The function works by simulating the event outcomes in each group through bootstrap resampling. For each group, it draws `n1` (or `n2`) samples with replacement from a hypothetical population that has the observed proportion of events (`r1/n1` or `r2/n2`). The number of events in each resampled set (`R1` and `R2`) is then used to calculate a bootstrapped risk ratio `(R1/n1) / (R2/n2)`. This process is repeated `nboot` times to generate a distribution of risk ratios. The function then calculates the mean of this distribution and its Highest Density Interval (HDI), which represents the most credible range for the true risk ratio given the data and the bootstrap procedure.

If `verbose` is set to `TRUE`, the function attempts to plot the distribution of the bootstrapped risk ratios using a script named `plotpost.R`. This requires that the `plotpost.R` script exists in the current working directory and is capable of handling the vector of bootstrapped risk ratios.

Value:

The function returns a list with the following components:

* `b_mean`: The mean of the bootstrapped risk ratios.
* `b_ci`: The Highest Density Interval (HDI) of the bootstrapped risk ratios, as a vector with the lower and upper bounds.

Note:

The `verbose = TRUE` option depends on an external script `plotpost.R`. If you intend to use this option, ensure that the script is available and correctly implemented for plotting posterior-like distributions. The HDI is calculated using the `hdi` function from the `HDInterval` package, so this package must be installed (`install.packages("HDInterval")`) and loaded (`library(HDInterval)`) if you intend to use the default behavior.

http://rio2016.5ch.net/test/read.cgi/math/1723152147/828

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