Sampling Frequency of a Time Series
DESCRIPTION:
Returns the frequency of sampling for time series or the time interval between observations.
USAGE: 
frequency(x)
deltat(x)
REQUIRED ARGUMENTS:
x:
a univarite or multivariate regularly spaced time series (rts or cts).
VALUE:
deltat returns the time interval between observations, and frequency returns the number of observations in a sampling cycle.
DETAILS:
The values of deltat and frequency are reciprocals.
SEE ALSO:
cts , cycle , rts , time , tspar , units .
EXAMPLES: 
freeny.rts<- as.rts(freeny.y)
freeny.rts


# produces the following output:
             1       2       3       4
 1962:         8.79236 8.79137 8.81486
 1963: 8.81301 8.90751 8.93673 8.96161
 1964: 8.96044 9.00868 9.03049 9.06906
 1965: 9.05871 9.10698 9.12685 9.17096
 1966: 9.18665 9.23823 9.26487 9.28436
 1967: 9.31378 9.35025 9.35835 9.39767
 1968: 9.42150 9.44223 9.48721 9.52374
 1969: 9.53980 9.58123 9.60048 9.64496
 1970: 9.64390 9.69405 9.69958 9.68683
 1971: 9.71774 9.74924 9.77536 9.79424
    start deltat frequency
  1962.25   0.25         4


frequency(freeny.rts)


# produces the following output:
 frequency
         4


deltat(freeny.rts)


# output:
 deltat
   0.25