Plot of Hazard Curves

["Andrew Scott" <andrew.scott@icfrith.com.au>]

Dear S-News Readers,

 

Does anyone know how to extend the range of a hazard curve plot?

 

For example, the following commands

 

SurvCurve.1<-survfit(Surv(startTime,endTime,status)~Brand, data="">

plot(SurvCurve.1,fun="cloglog",xlab="Time",ylab="Cumulative Hazard Rates",lty=2:(length(table(Brand))+1),col=1:(length(table(Brand))))

 

produce a plot which appears to have a lower limit of -4.5. This limit remains even if I set a different limit by using the "ylim" option in the plot command above. Can I override this?

 

Also quite often I can get a successful plot of the fitted survival curves but not for the equivalent hazard curves (by removing "fun=cloglog"). I'm not sure why it would work for one but not the other. This usually coincides with the following error with the above command: 'Problem in rep.int: No missing values allowed in "times": rep.int(x, times)'. Any suggestions are welcome.

 

Thanks

Andrew G Scott BEc FIAA Manager - Strategic Analysis and Product Development Tel: 02 8853 9117 Mob: 0411 555 486 Fax: 02 8853 9517 andrew.scott@icfrith.com.au

IC Frith & Associates Suite 1, Building B, 34-46 Brookhollow Ave, Baulkham Hills NSW 2153 Private Mail Bag 14, Castle Hill 1765 Phone: 02 8853 9100 Fax: 02 9634 2396 www.icfrith.com.au

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