Use this function to get the 'id' of a frequency class.
Usage
get.class.id(frequency)
Value
A character string that represents the class id of this frequency.
Arguments
frequency
The frequency, which must be an ldtf object returned from the f.? functions.
Details
You need this 'id' to convert the character back to the object. Some frequencies have a constant class id, such as 'm' for 'monthly' data. Some class 'ids' have parameters in them. Note that the format is explained in the f.? functions.