Identify unique contrasts within a network that make up all the head-to-head comparisons. Repetitions of the same treatment comparison are grouped together.
A data frame containing variables
A data frame of unique comparisons in which each row represents a different comparison.
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 follow-up observation for each study within the dataset (i.e. as for standard
nr will represent the number of studies that compare treatments
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
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