MIICD.crreg: Fine & Gray regression for interval censored competing risks...

In MIICD: Multiple Imputation for Interval Censored Data

Description

Uses the multiple imputation approach to compute regression coefficient and its associated variance-covariance matrix, and baseline cumulative incidence estimates for interval censorded competing risks data

Usage

MIICD.crreg(formula, k, m, status, trans, cens.code, data, method = c("PMDA",
  "ANDA"), verbose = FALSE)

Arguments

formula	A formula. The right hand side indicates names of covariables to be found in data
verbose	Logical, display the results ?
method	Which data augmentation scheme shall be used ? Two algorithms are implemented : The Poor man's Data Augmentation scheme and the Asymptotic Normal Data Augmentation scheme (the later may be preferred).
k	An integer, indicates the number of iteration to perform
m	An integer, indicates the number of imputation to perform at each iteration
status	The name of the column where status are to be found
trans	Denomination of the event of interest in the status column
cens.code	Censor indicator in the status column of the data
data	The input data (see details)

Details

This function uses data augmentation and multiple imputation aproach to estimate regression coefficient, variance-covariance matrix and baseline cumulative incidence estimates in a competing risks proportional hazards regression model for interval censorded competing risks data.

Estimates are computed using Rubin's rules (Rubin (1987)). Estimate of coefficient is computed as the mean of estimates over imputation. The variance-covariance matrix is computed as the within imputation variance and the between imputation variance augmented byan inflation factor to take into account the finite number of imputation. At each iteration, the baseline cumulative incidence function is updated and multiple imputation is performed using the updated estimates. Print and plot methods are available to handle results.

Print and plot methods are available to handle results.

The data must contain at last four columns. One named left, one named right, the name of the 3^rd is indicated by the status parameter and one for the covariate to be tested. For interval censored data, the left and right columns indicates the lower and the upper bounds of the intervals respectively. Inf in the right column stands for right censored observations. When an observation is right censored, the status column must contain the censor indicator specified by cens.code. The transition of interest must be precised by the trans parameter.

Value

Coef. Final estimate of the coefficient

vcov Final estimate of the variance-covariance matrix

Coef_seq Sequence of the coefficient estimate over iterations

Sigma_seq Sequence of the coefficient standard deviation over iterations

df data frame containing the main results

... Other returned values

Author(s)

Marc Delord <[e-mail]>

References

Delord, M. & Genin, E. Multiple Imputation for Competing Risks Regression with Interval Censored Data Journal of Statistical Computation and Simulation, 2015

Fine JP and Gray RJ (1999) A proportional hazards model for the subdistribution of a competing risk. JASA 94:496-509.

PAN, Wei. A Multiple Imputation Approach to Cox Regression with Interval-Censored Data. Biometrics, 2000, vol. 56, no 1, p. 199-203.

Rubin, D. B. (1987). Multiple imputation for nonresponse in surveys.

Schenker, N. and Welsh, A. (1988). Asymptotic results for multiple imputation. The Annals of Statistics pages 1550-1566.

Tanner, M. A. and Wong, W. H. (1987). An application of imputation to an estimation problem in grouped lifetime analysis. Technometrics 29, 23-32.

Wei, G. C., & Tanner, M. A. (1991). Applications of multiple imputation to the analysis of censored regression data. Biometrics, 47(4), 1297-1309.

See Also

Surv, survfit, FGR, mvrnorm

Examples

res <- MIICD.crreg(formula = ~ treatment, k = 5, m = 5, status = 'status',
 trans = 1, data = ICCRD,  cens.code = 0, method = 'ANDA', verbose = FALSE )
 res
 plot(res)
 #diagnostic plot for coefficients end associated standard error
 plot(res , type = 'coef' , coef = 1)
 plot(res , type = 'sigma' , coef = 1)

Example output

Iterates


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..
  

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Fine & Gray regression for competing risks interval censored data using data augmentation and multiple imputation

Call:
MIICD.crreg(formula = ~treatment, k = 5, m = 5, status = "status", 
    trans = 1, cens.code = 0, data = ICCRD, method = "ANDA", 
    verbose = FALSE)

Interval-censored Response of a proportional hazard model with competing risks:

No.Observation: 150 

Patern:

                          type
Cause                      exact interval-censored right-censored
  1                            0                64              0
  2                           37                 0              0
  unknown (right-censored)     0                 0             49

Coefficients:
                   coef   exp(coef)   se(coef)       z         p   
treatment: tr2   0.6195       1.858     0.2587   2.395   0.01664   

MIICD documentation built on May 2, 2019, 11:01 a.m.