Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Library: stats
See also: hazard

Quantlet: kaplanmeier
Description: Calculation of the Kaplan-Meir (product limit) estimator of the hazard rate and the survivor function for a set of durations. The first column of the input is a censorship indicator variable, (equal to zero if the duration is censored, and to one otherwise); the second column is the duration.

Reference(s):

Usage: h = kaplanmeier(y {,intervals {,disp}})
Input:
y n x 2 matrix
intervals vector
disp constant
Output:
h vector

Note:

Example:

;Nonparametric estimator of the hazard rate for the leukaemia 

; data

library("stats") 

x = read("leukaemia.dat")

h = kaplanmeier(x)

h

Result:



Contents of h

[1,]        6  0.14286  0.85714 

[3,]       10  0.066667  0.75294 

[4,]       13  0.083333   0.6902 

[5,]       16  0.090909  0.62745 

[6,]       22  0.14286  0.53782 

[7,]       23  0.16667  0.44818 

Example:

;Nonparametric estimator of the hazard rate for the leukaemia 

; data.

library("stats")

x = read("leukaemia.dat")

h = kaplanmeier(x,1) 

h

Result:



Same as above. The estimated hazard rate and survivor 

functions are displayed, as a constant appears as last argument.

Example:

; Nonparametric estimator of the hazard rate for the leukaemia 

; data, on a grid interval.

library("stats")

x = read("leukaemia.dat") 

k = #(4,8,12,16,20,30); The grid intervals

h = kaplanmeier(x,k)

h

Result:



Contents of h

[1,]        4  0.42857  0.57143 

[2,]        8   0.3125  0.39286 

[3,]       12  0.33333   0.2619 

[4,]       16  0.27273  0.19048 

[5,]       20     0.25  0.14286 

Example:

; Nonparametric estimator of the hazard rate for the leukaemia 

; data, on a grid interval.

library("stats")

x = read("leukaemia.dat") 

k = #(4,8,12,16,20)

h = kaplanmeier(x,k,2)

h

Result:



Same as above. The estimated hazard rate and survivor 

functions are displayed, as a constant appears as last argument.


Library: stats
See also: hazard

Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Author: Gilles Teyssiere, 980530
(C) MD*TECH Method and Data Technologies, 21.9.2000