This is the work horse function that calculates the effective sample size. Should usually not be called by the user directly.
effective_samplesize(size, share, corr = 0.5, weights = NULL)A vector of sample sizes from different surveys (from different pollsters) for one party.
The relative share of votes for party of interest ([0-1])
Assumed correlation between surveys (of different pollsters). Defaults to 0.5.
Additional weights for individual surveys.