changePoint-class {ChangepointTesting} | R Documentation |

## Class `"changePoint"`

### Description

Value object returned by call to `changePoint()`

.

### Objects from the Class

This object should not be created by users.

### Slots

`CW`

:Object of class

`numeric`

or NULL. A vector of 1/0 values; 1 indicates that hypothesis was rejected by the Cao-Wu method.`chgPts`

:Object of class

`numeric`

or NULL. The vector of change points identified by the Cao-Wu method. If no change points are identified, NULL.`pi_alt`

:Object of class

`numeric`

. The estimated proportion of alternative hypotheses calculated using the Cao-Wu method.`num_alt`

:Object of class

`numeric`

. The estimated number of alternative hypotheses calculated using the Cao-Wu method.`FDRL`

:Object of class

`numeric`

or NULL. A vector of 1/0 values; 1 indicates that hypothesis was rejected by the FDR_L method.`BH`

:Object of class

`numeric`

or NULL. A vector of 1/0 values; 1 indicates that hypothesis was rejected by the FDR_L method.`gammaStar`

:Object of class

`numeric`

. The estimated critical value for testing used by the Cao-Wu method.`sigmaSq`

:Object of class

`numeric`

. The estimated variance used to determine the critical value of the Cao-Wu method.`pVals`

:Object of class

`numeric`

. The original p-values provided as input.

### Methods

- BH
`signature(x = "changePoint")`

: Retrieves a vector of integer values. An elements is 1 if the null hypothesis is rejected by the Benjamini-Hochberg (1995) method.- blocks
`signature(x = "changePoint")`

: Retrieves a list, each element of which is a vector of integer values. Each vector contains the indices of an alternative hypothesis block.- CW
`signature(x = "changePoint")`

: Retrieves a vector of integer values. An element is 1 if the null hypothesis is rejected by the Cao-Wu change point (2015) method.- changePts
`signature(x = "changePoint")`

: Retrieves a vector of integer values. The vector of change points identified by the Cao-Wu (2015) method. If no change points are identified, NULL is returned.- FDRL
`signature(x = "changePoint")`

: Retrieves a vector of integer values. Elements are 1 if the null hypothesis is rejected by the FDR_L (Zhang et al. 2011) method.- critical
`signature(x = "changePoint")`

: Retrieves the estimated critical value for testing used by the Cao-Wu (2015) method.- numAlt
`signature(x = "changePoint")`

: Retrieves the estimated number of alternative hypotheses obtained by the Cao-Wu (2015) method.- piAlt
`signature(x = "changePoint")`

: Retrieves the estimated proportion of alternative hypotheses obtained by the Cao-Wu (2015) method.- plot
`signature(x = "changePoint", y = "missing", logp = FALSE, ...)`

: Generates x-y plots of -log(p) vs position or p-value vs position for each alternative hypothesis block obtained by the Cao-Wu (2015) method. logp is TRUE/FALSE indicating if -log(p)/p-values are plotted on the y-axis.- sigmaSq
`signature(x = "changePoint")`

: Retrieves the estimated variance used to determine the critical value of the Cao-Wu (2015) method.

### Author(s)

Hongyuan Cao, Wei Biao Wu, and Shannon T. Holloway Maintainer: Shannon T. Holloway <shannon.t.holloway@gmail.com>

### References

Benjamini, Y. and Hochberg, Y. (1995). Controlling the false discovery rate: A practical and powerful approach to multiple testing. Journal of the Royal Statistical Society: Series B, 57, 289–300.

Cao, H. and Wu, W. B. (2015) Changepoint estimation: Another look at multiple testing problems. Biometrika, 102, 974–980.

Zhang, C., Fan, J., and Yu, T. (2011). Multiple testing via FDRL for large-scale imaging data. Anals of Statistics, 39, 613–642.

### Examples

```
showClass("changePoint")
```

*ChangepointTesting*version 1.1 Index]