fxreturns {fxregime} | R Documentation

## Compute Exchange Rate Returns

### Description

Compute a multivariate series of exchange rate returns (log-returns in percent) from a multivariate series of exchange rates.

### Usage

    fxreturns(x, other = c("USD", "JPY", "DUR", "GBP"), data = FXRatesCHF,
      frequency = "weekly", start = NULL, end = NULL, na.action = na.locf, trim = FALSE)

### Arguments

`x` | character with column name of selected target currency.
`other` | character vector with column names of further currencies (to be used as regressors).
`data` | a `"zoo"` time series with FX rates (with respect to a base currency).
`frequency` | character specifying whether weekly or daily returns should be computed.
`start` | start time of the exchange rate series (before computing returns).
`end` | end time of the exchange rate series.
`na.action` | function for handling `NA`s.
`trim` | logical or numeric. Should time points with extreme returns of the target currency be excluded? If set to `TRUE`, the quantiles `c(0.01, 0.99)` are used for trimming.

### Details

`fxreturns` is a convenience function for selecting a smaller number of currencies from a large database of exchange rates (such as `FXRatesCHF` provided with the package), selecting a certain time window (if necessary), computing returns (weekly or daily), eliminating missing values and potentially trimming extreme returns (of the target currency).

### Value

A `"zoo"` with the returns of the specified currencies.

### References

Shah A., Zeileis A., Patnaik I. (2005), What is the New Chinese Currency Regime?, Report 23, Department of Statistics and Mathematics, Wirtschaftsuniversitaet Wien, Research Report Series, November 2005.

Zeileis A., Shah A., Patnaik I. (2008), Testing, Monitoring, and Dating Structural Changes in Maximum Likelihood Models, Report 70, Department of Statistics and Mathematics, Wirtschaftsuniversitaet Wien, Research Report Series, August 2008.

### See Also

`fxlm`, `fxregimes`, `fxmonitor`

### Examples

    ## load package and data
    library("fxregime")
    data("FXRatesCHF", package = "fxregime")

    ## compute returns for CNY (and explanatory currencies)
    ## for one year after abolishing fixed USD regime
    cny <- fxreturns("CNY", frequency = "daily",
      start = as.Date("2005-07-25"), end = as.Date("2006-07-24"),
      other = c("USD", "JPY", "EUR", "GBP"))
    plot(cny)

[Package fxregime version 0.3-1 Index]