sunspot {stats} | R Documentation

## Yearly Sunspot Data, 1700-1988, and Monthly Sunspot Data, 1749-1997

### Description

Monthly and yearly number of sunspots.

### Usage

    data(sunspot)

### Format

The univariate time series `sunspot.year` and `sunspot.month` contain 289 and 2988 observations, respectively. The objects are of class `"ts"`.

### Source

Monthly data: Sunspot Index Data Center, 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

Yearly data: H. Tong (1996) Non-Linear Time Series. Clarendon Press, Oxford, p. 471.

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

### See Also

`sunspot.month` is a longer version of `sunspots` that runs until 1988.

### Examples

    ## Compare the monthly series
    data(sunspots)
    data(sunspot)
    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))

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