# yearqtr

From zoo v0.9-9
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)
```

*Documentation reproduced from package zoo, version 0.9-9, License: GPL*

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