# ROC

From TTR v0.23-6
by Joshua Ulrich

##### Rate of Change / Momentum

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

periods.

- Keywords
- ts

##### Usage

`ROC(x, n = 1, type = c("continuous", "discrete"), na.pad = TRUE)`momentum(x, n = 1, na.pad = TRUE)

##### Arguments

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

- n
Number of periods to use.

- type
Compounding type; either

`"continuous"`

(the default) or`"discrete"`

.- na.pad
Should periods prior to

`n`

be appended? Default is`TRUE`

.

##### Details

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

##### Value

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`

.

##### Examples

```
# NOT RUN {
data(ttrc)
roc <- ROC(ttrc[,"Close"])
mom <- momentum(ttrc[,"Close"])
# }
```

*Documentation reproduced from package TTR, version 0.23-6, License: GPL (>= 2)*

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