sunspot.month {datasets} | R Documentation |
Monthly numbers of sunspots.
sunspot.month
The univariate time series sunspot.year
and
sunspot.month
contain 289 and 2988 observations, respectively.
The objects are of class "ts"
.
Prior to R 2.0.0 sunspot.month
and sunspot.year
were copied to the user's workspace (or elsewhere) by
data(sunspot)
. However, as package lattice has a dataset
sunspot
which can be retrieved by the same command, that usage
has been removed.
World Data Center-C1 For Sunspot Index Royal Observatory of Belgium, Av. Circulaire, 3, B-1180 BRUSSELS http://www.oma.be/KSB-ORB/SIDC/sidc_txt.html
sunspot.month
is a longer version of sunspots
that runs until 1988 rather than 1983.
require(stats) ## Compare the monthly series plot (sunspot.month, main = "sunspot.month [stats]", col = 2) lines(sunspots) # "very barely" see something ## Now look at the difference : all(tsp(sunspots) [c(1,3)] == tsp(sunspot.month)[c(1,3)]) ## Start & Periodicity are the same n1 <- length(sunspots) table(eq <- sunspots == sunspot.month[1:n1]) #> 132 are different ! i <- which(!eq) rug(time(eq)[i]) s1 <- sunspots[i] ; s2 <- sunspot.month[i] cbind(i = i, sunspots = s1, ss.month = s2, perc.diff = round(100*2*abs(s1-s2)/(s1+s2), 1))