f.multi.yearly {tdata}

Create a Multi-Year Frequency

Description

Use this function to create a frequency for time-series data that occurs every z years.

Usage

f.multi.yearly(year, z)

Arguments

year

An integer representing the year of the observation.

z

An integer representing the number of years. It should be larger than zero.

Details

In order to use the as.frequency function for this type of frequency, you need the following information:

• Character Format "#" (the number is the year, which means the string representation is the first year of the interval)

• Class Id "z#" ('#' represents the value: z; e.g., z3 means every 3 years)

Value

An object of class ldtf which is also a list with the following members:

class

Determines the class of this frequency.

year

Determines the year.

z

Determines the value: z.

Examples

my0 <- f.multi.yearly(2020, 2)
#      this is a multi-year frequency that refers to the year 2020.
#      The next observation is expected in 2022 (not the next year).

my0_value_str <-  as.character(my0) # this will be '2020'.
my0_class_str <- get.class.id(my0) # this will be 'z2'.

my_new <- as.frequency("2020", "z3")
#      this is a multi-year frequency that refers to the year 2020.
#      However, the next observation is expected in 2023.

# Don't make the following mistakes:

my_invalid <- try(f.multi.yearly(2020, 0))
my_invalid <- try(f.multi.yearly(2020, -5))
my_invalid <- try(as.frequency("2021", "z"))