Calculate the (rate of) change of a series over `n`

periods.

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`x` |
Price, volume, etc. series that is coercible to xts or matrix. |

`n` |
Number of periods to use. |

`type` |
Compounding type; either |

`na.pad` |
Should periods prior to |

The ROC indicator provides the percentage difference of a series over two observations, while the momentum indicator simply provides the difference.

A object of the same class as `x`

or a vector (if
`try.xts`

fails) containing the rate-of-change (or
return) values for `ROC`

or a vector containing the
differenced price series for `momentum`

.

Joshua Ulrich

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