# yearqtr

From zoo v0.9-9
0th

Percentile

##### An Index Class for Quaterly Data

"yearqtr" is a class for representing quaterly data.

Keywords
ts
##### Usage
yearqtr(x)
##### Arguments
x
numeric (interpreted as being in years).
##### Details

The yearqtr class is used to represent quaterly data. Internally it holds the data as year plus 0 for Quarter 1, 1/4 for Quarter 2 and so on in order that its internal representation is the same as ts class with frequency = 4. If x is not in this format it is rounded via floor(4*x + .0001)/4. There are coercion methods available for various classes including: default coercion to "yearqtr" (which coerces to "numeric" first) and coercion from "yearqtr" to "Date" (see below), "POSIXct", "POSIXlt", "numeric", "character".

##### Value

• Returns its argument converted to class yearqtr.

yearmon, zoo, zooreg, ts

##### Aliases
• yearqtr
• as.yearqtr
• as.yearqtr.default
• as.yearqtr.numeric
• as.yearqtr.integer
• as.yearqtr.dates
• as.yearqtr.Date
• as.yearqtr.POSIXt
• as.Date.yearqtr
• as.POSIXct.yearqtr
• as.POSIXlt.yearqtr
• as.numeric.yearqtr
• as.character.yearqtr
• c.yearqtr
• format.yearqtr
• print.yearqtr
• [.yearqtr
• axis.yearqtr
• MATCH.yearqtr
• Ops.yearqtr
##### Examples
x <- yearqtr(2000 + seq(0, 7)/4)
x

# returned Date is the fraction of the way through
# the period given by frac (= 0 by default)
as.Date(x)
as.Date(x, frac = 1)
as.POSIXct(x)

z <- zoo(rnorm(8), x, frequency = 4)
z
as.ts(z)
Documentation reproduced from package zoo, version 0.9-9, License: GPL

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