Represents two distributions (prospects) that are going to be compared using Stochastic Dominance (SD).
outcomeNumeric vector. The combined outcome values in ascending order.
prob1,prob2Numeric vectors. Probabilities corresponding to the prospects.
cdf1,cdf2Numeric vectors. Cumulative values corresponding to the prospects.
ssd1,ssd2Numeric vectors. SSD values corresponding to the prospects.
It contains the input validation needed for comparing two prospects. For example, having sorted `outcome`, each of `prob1` and `prob2` adds up to one, arguments having the same lengths, and having matched probability, cumulative, and ssd arguments.