Example 7.40: Nelson-Aalen plotting

June 7, 2010

(This article was first published on SAS and R, and kindly contributed to R-bloggers)

In our previous entry, we described how to calculate the Nelson-Aalen estimate of cumulative hazard. In this entry, we display the estimates for the time to linkage to primary care for both the treatment and control groups in the HELP study.RWe use the previously defined function, after removing missing values and sorting by the time to event or censoring.ds = read.csv(“http://www.math.smith.edu/

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