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Summarize Kaplan–Meier time-to-event outcome

Source: R/AutoScript.summary.R
AS.summary.KM.Rd

Computes a string with the Kaplan–Meier median survival time and a 95% confidence interval using the Brookmeyer–Crowley¹ method with Greenwood's variance² and a complementary log–log transformation³. Observations with non-positive are excluded.

Usage

AS.summary.KM(time, status, digits.fixed = 2)

Arguments

time

Follow-up times.

status

Event indicator (1 = event, 0 = censored).

digits.fixed

Number of decimal places for the summary. Default = 2.

Value

A string of the form "median (lower to upper)" or "NR" if the median is not reached.

References

  1. Brookmeyer, R. and Crowley, J., 1982. A confidence interval for the median survival time. Biometrics, pp. 29–41.

  2. Greenwood, M., 1926. A report on the natural duration of cancer. In: Reports on Public Health and Medical Subjects, 33, pp. 1–26. London: Her Majesty’s Stationery Office, Ministry of Health.

  3. Klein, J.P., Logan, B., Harhoff, M. and Andersen, P.K., 2007. Analyzing survival curves at a fixed point in time. Statistics in Medicine, 26(24), pp. 4505–4519.