mb.comparisons: Identify unique comparisons within a network (identical to MBNMAdose)
Description
Identify unique contrasts within a network that make up all the head-to-head comparisons. Repetitions
of the same treatment comparison are grouped together.
Usage
mb.comparisons(data)
Value
A data frame of unique comparisons in which each row represents a different comparison.
t1 and t2 indicate the treatment codes that make up the comparison. nr indicates the number
of times the given comparison is made within the network.
If there is only a single observation for each study within the dataset (i.e. as for standard
network meta-analysis) nr will represent the number of studies that compare treatments t1 and
t2.
If there are multiple observations for each study within the dataset (as in time-course MBNMA)
nr will represent the number of time points in the dataset in which treatments t1 and t2 are
compared.
Arguments
data
A data frame containing variables studyID and treatment (as numeric codes) that
indicate which treatments are used in which studies.
data <- data.frame(studyID=c(1,1,2,2,3,3,4,4,5,5,5),
treatment=c(1,2,1,3,2,3,3,4,1,2,4)
)
# Identify comparisons informed by direct and indirect evidencemb.comparisons(data)