Calculate the number of specified periods in a given time series like data object.

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`x` |
A time-based object |

Essentially a wrapper to `endpoints`

with the appropriate
period specified; the resulting value derived from counting the
endpoints

As a compromise between simplicity and accuracy, the results will always round up to the nearest complete period. So n**** - 1 will return the completed periods.

For finer grain detail one should call a higher frequency n**** function.

An alternative summary can be found with `periodicity`

and `unclass(periodicity(x))`

.

The number of observations for the period type specified

Jeffrey A. Ryan

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