afthd (version 1.1.0)

lgstbyuni: Univariate estimates of AFT model with log logistic distribution using MCMC.

Description

Provides estimate of AFT model with log logistic distribution using MCMC for univariate in high dimensional gene expression data. It also deals covariates with missing values.

Usage

lgstbyuni(m, n, STime, Event, nc, ni, data)

Arguments

m

Starting column number of covariates of study from high dimensional entered data.

n

Ending column number of covariates of study from high dimensional entered data.

STime

name of survival time in data

Event

name of event in data

nc

number of chain used in model.

ni

number of iteration used in model.

data

High dimensional gene expression data that contains event status, survival time and and set of covariates.

Value

Data frame is containing posterior estimates (Coef, SD, Credible Interval, Rhat, n.eff) of regression coefficient of selected covariates and deviance. Result shows together for all covariates chosen from column m to n.

Details

This function deals covariates (in data) with missing values. Missing value in any column (covariate) is replaced by mean of that particular covariate. AFT model is log-linear regression model for survival time \( T_{1}\),\( T_{2}\),..,\(T_{n}\). i.e., $$log(T_i)= x_i'\beta +\sigma\epsilon_i ;~\epsilon_i \sim F_\epsilon (.)~which~is~iid $$ Where \( F_\epsilon \) is known cdf which is defined on real line. When baseline distribution is logistic then T follows log logistic distribution. $$ T \sim Log-Logis(x'\beta,\sqrt{\tau)} $$

References

Prabhash et al(2016) <doi:10.21307/stattrans-2016-046>

See Also

wbysmv, lgnbymv, lgstbymvs

Examples

# NOT RUN {
##
data(hdata)
lgstbyuni(12,14,STime="os",Event="death",3,100,hdata)
##
# }