yearqtr
From zoo v1.1-0
by Achim Zeileis
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
.
See Also
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)
Community examples
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