initialize-incClass-method: Constructor incClass
In mknoll/incAnalysis: Comparative Analysis of Model Performances for Rate Data

Constructor for new analysis object

## S4 method for signature 'incClass'
initialize(.Object, dateCreated = base::POSIXct,
  population = data.frame, cases = data.frame, nPred = numeric,
  nFit = numeric, predLast = numeric, gridFactor = numeric,
  entity = character, ...)

`.Object`	class instance
`dateCreated`	Date of creation
`population`	data.frame containing count data with years in rows (first row: earliest year) and numeric ages in cols (increasing from left to right)
`cases`	data.frame containing count data, same design as the population data
`nPred`	Prediction period. Calculated backwards from the earliest valid (in population and incidence available) year.
`nFit`	Model fitting period. Counted backwards from the earliest year from which the prediction period starts. For forward projection of last observation, the year previous to the start of the prediction interval is selected.
`predLast`	Return only last observation year predictions and metrics when using the metrics() function.
`gridFactor`	Ratio of age-width and yearly structure. If data is given in yearly fashion and 1-year age groups, the grid factor is 1. For yearly data and 5-year age groups, the grid factor is 5.
`entity`	Free text variable.
`...`	additional parameters