Next {quantmod} | R Documentation |

## Advance a Time Series

### Description

Create a new series with all values advanced forward one period.
The value of period 1, becomes the value at period 2,
value at 2 becomes the original value at 3, etc. The opposite
of `Lag`

. `NA`

is used to fill.

### Usage

Next(x, k = 1)
## S3 method for class 'quantmod.OHLC':
Next(x,k=1)
## S3 method for class 'zoo':
Next(x,k=1)
## S3 method for class 'data.frame':
Next(x,k=1)
## S3 method for class 'numeric':
Next(x,k=1)

### Arguments

`x` |
vector or series to be advanced |

`k` |
periods to advance |

### Details

Shift series k-periods up, appending `NA`

s to end of series.

Specifically designed to handle `quantmod.OHLC`

and
`zoo`

series within the quantmod workflow.

If no S3 method is found, a call to `lag`

in base is made,
with the indexing reversed to shift the time series forward.

### Value

The original `x`

appended with `k`

`NA`

s and
missing the leading `k`

values.

The returned series maintains the number of obs. of the original.

Unlike `Lag`

, only one value for `k`

is allowed.

### Note

This function's purpose is to get the “next” value of
the data you hope to forecast, e.g. a stock's closing value
at t+1. Specifically to be used within
the quantmod framework of `specifyModel`

, as a
functional wrapper to the LHS of the model equation.

It is not magic - and thus will not get tomorrow's values...

### Author(s)

Jeffrey A. Ryan

### See Also

`specifyModel`

, `Lag`

### Examples

Stock.Close <- c(102.12,102.62,100.12,103.00,103.87,103.12,105.12)
Close.Dates <- as.Date(c(10660,10661,10662,10665,10666,10667,10668),origin="1970-01-01")
Stock.Close <- zoo(Stock.Close,Close.Dates)
Next(Stock.Close) #one period ahead
Next(Stock.Close,k=1) #same
merge(Next(Stock.Close),Stock.Close)
## Not run:
# a simple way to build a model of next days
# IBM close, given todays. Technically both
# methods are equal, though the former is seen
# as more intuitive...ymmv
specifyModel(Next(Cl(IBM)) ~ Cl(IBM))
specifyModel(Cl(IBM) ~ Lag(Cl(IBM)))
## End(Not run)

[Package

*quantmod* version 0.3-6

Index]