Moving Average

Generic function for computing a moving (sliding) average of ts.

Usage

ma(x, ...)

# S3 method for default
ma(x, win.len, FUN = mean, ...)

# S3 method for zoo
ma(x, win.len, FUN = mean, ...)

Arguments

x

ts or zoo object.

win.len

number of terms that will be considered in the mean. It have to be odd

FUN

Function that have to be applied for computing the moving average. Usually, FUN MUST be mean

...

further arguments passed to or from other methods.

Value

a vector with the moving average termns. The length of the resulting vector is the same of x, but the first and last (win.len-1)/2 elements will be NA.

Author

Mauricio Zambrano-Bigiarini, mzb.devel@gmail

Examples

## Loading daily streamflows at the station Oca en Ona (Ebro River basin, Spain) ##
data(OcaEnOnaQts)
x <- OcaEnOnaQts

## Daily to Monthly ts
m <- daily2monthly(x, FUN=mean, na.rm=FALSE)

# Plotting the monthly values
plot(m, xlab="Time")

## Plotting the annual moving average in station 'x'
lines(ma(m, win.len=12), col="blue")