The ts object

The core R package datasets contains lot of datasets that are essentially time series data: AirPassengers, BJsales, EuStockMarkets, JohnsonJohnson, LakeHuron, Nile, UKgas, UKDriverDeaths, UKLungDeaths, USAccDeaths, WWWusage, airmiles, austres, co2, discoveries, lynx, nhtemp, nottem, presidents, treering, gas, uspop, and sunspots. The AirPassengers data is one of the most popular datasets and it is used as a benchmark dataset. The data can be loaded in an R session with data(mydata) and its class can be verified as time series as follows:

data
(JohnsonJohnson)


class
(JohnsonJohnson)


## [1] "ts"

JohnsonJohnson

## Qtr1 Qtr2 Qtr3 Qtr4

## 1960 0.71 0.63 0.85 0.44

## 1961 0.61 0.69 0.92 0.55

## 1962 0.72 0.77 0.92 0.60

## 1978 11.88 12.06 12.15 8.91


## 1979 14.04 12.96 14.85 9.99


## 1980 16.20 14.67 16.02 11.61


frequency
(JohnsonJohnson)

## [1] 4

The JohnsonJohnson dataset is a time series dataset and it is verified by applying the class function. Details about...