makeDecisionProblem: Construct Decision Problem
In florianfendt/dips: Decision Problems In Preference Systems

Constructs a Decision Problem from a data frame.

1	makeDecisionProblem(df, state, action, exclude = NULL)

`df`	[`data.frame`] Data from which the Decision Problem shall be derived.
`state`	[`character(1L)`] Name of the variable assigning the states of nature.
`action`	[`character(1L)`] Name of the variable assigning the acts to the data frame rows.
`exclude`	[`character`] Variable names that should be excluded from the decision problem. Default is `NULL`, meaning no variable is excluded.

[DecisionProblem] With entries:

df: The original data frame. State and action variable names have been altered to 'state' and 'action', respectively. Also their levels are now given as integer sequence.
n.alternatives: Number of observations in df
ordinal.information: List of ordinal info for each combination of state and action.
cardinal.information: List of ordinal info for each combination of state and action.
ordinal.vars: Variable names that provided ordinal information.
cardinal.vars: Variable names that were used to extract the cardinal information.