seewave (version 1.6.4)

specprop: Spectral properties

Description

This function returns a list of statistical properties of a frequency spectrum.

Usage

specprop(spec, f, str = FALSE, flim=NULL, plot = FALSE, type = "l", ...)

Value

• A list of 15 values is returned
• mean
  mean frequency (see mean)
• sd
  standard deviation of the mean (see sd)
• sem
  standard error of the mean
• median
  median frequency (see median)
• mode
  mode frequency, i.e. the dominant frequency
• Q25
  first quartile (see quantile)
• Q75
  third quartile (see quantile)
• IQR
  interquartile range (see IQR)
• cent
  centroid, see note
• skewness
  skewness, a measure of asymmetry, see note
• kurtosis
  kurtosis, a measure of peakedness, see note
• sfm
  spectral flatness measure (see sfm)
• sh
  spectral entropy (see sh)
• prec
  frequency precision of the spectrum

Details

The spectrum is converted in a probability mass function (PMF). If a selected value has to be selected with $, the argument str has to be set to FALSE.

Examples

data(orni)
a<-meanspec(orni,f=22050,plot=FALSE)
specprop(a,f=22050)
# to get a single measure of the list
specprop(a,f=22050)$mode
# to get the results structured
specprop(a,f=22050,str=TRUE)
# to limit the analysis between 4 and 6 kHz
specprop(a,f=22050,flim=c(4,6),str=TRUE)
# plots
specprop(a,f=22050,plot=1)
specprop(a,f=22050,plot=2)