newTriangle: Create a Triangle object.
In PirateGrunt/MRMR: Multivariate Regression Models for Reserving

Create a Triangle object.

newTriangle(TriangleData, OriginPeriods = NULL, DevelopmentLags = NULL,
  OriginEnd = NULL, OriginLength = years(1), StartDay = 1,
  StartMonth = 1, DevelopmentPeriod = months(1), EvaluationDates = NULL,
  OriginPeriodType = "Accident Year", TriangleName = NULL,
  StaticMeasures = NULL, StochasticMeasures = NULL, Groups = NULL,
  Cumulative = TRUE, Verbose = TRUE)

`TriangleData`	A dataframe
`OriginPeriods`	The name of the column in the TriangleData which holds the origin period.
`DevelopmentLags`	The column which holds the development lags.
`OriginEnd`	If the OriginPeriods argument refers to the start date of an origin period, this column holds the end dates.
`OriginLength`	If origin period is not an interval, this is used to construct the origin period.
`StartDay`	If origin period is not an interval, this is used to construct the origin period.
`StartMonth`	If origin period is not an interval, this is used to construct the origin period.
`DevelopmentPeriod`	If DevelopmentLags is not a period object, this is used to contruct DevelopmentLags.
`EvaluationDates`	A vector of dates corresponding to the data in TriangleData.
`OriginPeriodType`	A character value describing the type of origin period.
`TriangleName`	A character value used to refer to the Triangle object.
`StaticMeasures`	A character vector which names the static measures in the Triangle object.
`StochasticMeasures`	A character vector which names the stochastic measures in the Triangle object.
`Groups`	A character vector which names the column which contains grouping data.
`Cumulative`	Boolean indicating if the stochastic measures are cumulative or incremental.
`Verbose`	Boolean indicating whether or not warnings should be displayed.