vpc function

Variance Partition Components for dosresmeta Objects

Computes the Variance Partition Components for dose-response meta-analysis.

vpc(object)

Arguments

• object: an object of class dosresmeta produced by dosresmeta.

Returns

A vector containing the variance partition components for each non-referent observation.

Examples

## loading data
data("sim_os")

## Quadratic (one-stage) dose-response model
quadr <- dosresmeta(logrr ~ dose + I(dose^2), id = id, se = se, type = type,
                    cases = cases, n = n, data = sim_os, proc = "1stage")
                    
## Plot of the estimated vpc
plot(sim_os$dose[sim_os$se!=0], vpc(quadr), xlab = "dose")
lines(lowess(sim_os$dose[sim_os$se!=0], vpc(quadr)))

References

Goldstein H, Browne W, Rasbash J. Partitioning variation in multilevel models. Understanding Statistics: Statistical Issues in Psychology, Education, and the Social Sciences. 2002 Dec 2;1(4):223-31.

Author(s)

Alessio Crippa, alessio.crippa@ki.se