dssAggregate  R Documentation 
The expectation and variance of aggregated predictions is just a sum if the predictions are (conditionally) independent. This function computes the DSS for a matrix of observations and a matrix of predictions where the columns are to be summed according to a given factor.
dssAggregate(observed, pred, psi, groups)
observed 
a numeric matrix of observed counts. 
pred 
a numeric matrix of predicted counts. 
psi 
a numeric vector or matrix of overdispersion parameters such that

groups 
a factor variable of length 
a matrix of DSS values
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