Displaying 4 results from an estimated 4 matches for "z2_".
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2009 Jun 15
2
coxph and robust variance estimation
Hello,
I would like to compare two different models in the framework of Cox proportional hazards regression models.
On Rsitesearch and google I don't find a clear answer to my question.
My R-Code (R version 2.9.0)
coxph.fit0 <- coxph(y ~ z2_ + cluster(as.factor(keys))+ strata(stratvar_),
method="breslow" ,robust=T )
coxph.fit1 <- coxph(y ~ z_ + cluster(as.factor(keys))+ strata(stratvar_),
method="breslow" ,robust=T ) # marker and covariates
# Analysis of Devaince table
coxph.aov <- anova(coxph.f...
2011 Jan 03
1
Greetings. I have a question with mixed beta regression model in nlme.
...uppose that:*
*j in {1, ..., J}* *(level 1)*
*i in {1, ..., n_j}* *(level 2)*
*y_{ij} ~ Beta(mu_{ij} * phi_{ij}; (1 - mu_{ij}) * phi_{ij})
y_{ij} = mu_{ij} + w_{ij}
*
*with*
*logit(mu_{ij}) = Beta_{0i} + Beta_{1i} * x1_{ij} + b2 * x2_{ij}
log(phi_{ij}) = Gamma_{0i} + Gamma_{1i} * z1_{ij} + c2 * z2_{ij}
*
*Beta_{0i} = b_0 + u_{0i}
Beta_{1i} = b_1 + u_{1i}
Gamma_{0i} = c_0 + v_{0i}
Gamma_{1i} = c_1 + v_{1i}
*
*The vector* *(u_{0i}, u_{1i})'* *has normal distribution with mean*
*(0, 0)'* *and covariance matrix*
*sigma_{00} sigma_{01}
sigma_{10} sigma_{11}
*
*The vector* *(v_{0i}, v_{1i}...
2011 Jan 03
0
Greetings. I have a question with mixed beta regression model in nlme (corrected version).
...pose that:*
*j in {1, ..., J}* *(level 1)*
*i in {1, ..., n_j}* *(level 2)*
*y_{ij} ~ Beta(mu_{ij} * phi_{ij}; (1 - mu_{ij}) * phi_{ij})
y_{ij} = mu_{ij} + w_{ij}
*
*with*
*logit(mu_{ij}) = Beta_{0i} + Beta_{1i} * x1_{ij} + b_2 * x2_{ij}
log(phi_{ij}) = Gamma_{0i} + Gamma_{1i} * z1_{ij} + c_2 * z2_{ij}
*
*Beta_{0i} = b_0 + u_{0i}
Beta_{1i} = b_1 + u_{1i}
Gamma_{0i} = c_0 + v_{0i}
Gamma_{1i} = c_1 + v_{1i}
*
*The vector* *(u_{0i}, u_{1i})'* *has normal distribution with mean*
*(0, 0)'* *and covariance matrix*
*sigma_{00} sigma_{01}
sigma_{10} sigma_{11}
*
*The vector* *(v_{0i}, v_{1i}...
2009 Jun 15
0
books on Time serie
...t;
> Hello,
>
> I would like to compare two different models in the framework of Cox
> proportional hazards regression models.
>
> On Rsitesearch and google I don't find a clear answer to my question.
>
> My R-Code (R version 2.9.0)
>
> coxph.fit0 <- coxph(y ~ z2_ + cluster(as.factor(keys))+
> strata(stratvar_),
> method="breslow" ,robust=T )
>
> coxph.fit1 <- coxph(y ~ z_ + cluster(as.factor(keys))+
> strata(stratvar_),
> method="breslow" ,robust=T ) # marker and covariates
>
> # Analysis of Devaince...