# boundary.efp

From strucchange v1.5-1
by Achim Zeileis

##### Boundary for Empirical Fluctuation Processes

Computes boundary for an object of class `"efp"`

- Keywords
- regression

##### Usage

```
# S3 method for efp
boundary(x, alpha = 0.05, alt.boundary = FALSE,
functional = "max", ...)
```

##### Arguments

- x
an object of class

`"efp"`

.- alpha
numeric from interval (0,1) indicating the confidence level for which the boundary of the corresponding test will be computed.

- alt.boundary
logical. If set to

`TRUE`

alternative boundaries (instead of the standard linear boundaries) will be computed (for Brownian bridge type processes only).- functional
indicates which functional should be applied to the empirical fluctuation process. See also

`plot.efp`

.- …
currently not used.

##### Value

an object of class `"ts"`

with the same time properties as
the process in `x`

##### See Also

##### Examples

```
# NOT RUN {
## Load dataset "nhtemp" with average yearly temperatures in New Haven
data("nhtemp")
## plot the data
plot(nhtemp)
## test the model null hypothesis that the average temperature remains constant
## over the years
## compute OLS-CUSUM fluctuation process
temp.cus <- efp(nhtemp ~ 1, type = "OLS-CUSUM")
## plot the process without boundaries
plot(temp.cus, alpha = 0.01, boundary = FALSE)
## add the boundaries in another colour
bound <- boundary(temp.cus, alpha = 0.01)
lines(bound, col=4)
lines(-bound, col=4)
# }
```

*Documentation reproduced from package strucchange, version 1.5-1, License: GPL-2 | GPL-3*

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