[R] How does survreg ordered factors vs not ordered factors?

[wwreith]

Consider the following generic code for a survival model

survobj<-Surv(data$Time,data$Satisfactory)
survmodel<-survreg(survobj~x1+x2+x3+x4+x5+x6, data=data, dist="weibull")
survsum<-summary(survmodel)
survsum

My question: Does anyone know what exactly survreg() does differently if

x1<-factor(data$x1, ordered=TRUE)
x2<-factor(data$x2, ordered=TRUE)

vs. 

x1<-factor(data$x1)
x2<-factor(data$x2)

Thanks,

William

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