Description Usage Arguments Details Value Author(s) See Also Examples

Uses the output of the `envcpt`

function and plots optionally ("fit") the original data and the fit from each of the 8 models or ("aic") the aic for each of the 8 models.

1 2 |

`x` |
A list produced as output from the |

`type` |
character vector. |

`lwd` |
Line width graphical parameter, see |

`...` |
Extra graphical parameters, passed to the original plot and the individual calls to |

If `type="fit"`

, the function plots the data at the bottom and stacks the different fits for the 8 models from the `envcpt`

function on top. No scale is given as all data and fits are scaled to be in (0,1). This is designed as an initial visualization tool for the fits only.
If `type="aic"`

the function uses the `AIC.envcpt`

function to calculate the AIC values for the `envcpt`

output `x`

. Then barcharts the AIC values in the same order as the `type="fit"`

option. The minimum AIC is the preferred model and this is highlight by a solid block. This is designed as an initial visualization tool for the AIC values only.

Returns the printed graphic to the active device.

Rebecca Killick & Claudie Beaulieu.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | ```
## Not run:
set.seed(1)
x=c(rnorm(100,0,1),rnorm(100,5,1))
out=envcpt(x) # run the 8 models with default values
out[[1]] # first row is twice the negative log-likelihood for each model
# second row is the number of parameters
AIC(out) # returns AIC for each model.
which.min(AIC(out)) # gives meancpt (model 2) as the best model fit.
out[[3]] # gives the model fit for the meancpt model.
plot(out,type='fit') # plots the fits
plot(out,type="aic") # plots the aic values
set.seed(10)
x=c(0.01*(1:100),1.5-0.02*((101:250)-101))+rnorm(250,0,0.2)
out=envcpt(x,minseglen=10) # run the 8 models with a minimum of 10 observations between changes
AIC(out) # returns the AIC for each model
which.min(AIC(out)) # gives trendcpt (model 6) as the best model fit.
out[[7]] # gives the model fit for the trendcpt model.
plot(out,type='fit') # plots the fits
plot(out,type="aic") # plots the aic values
set.seed(100)
x=arima.sim(model=list(ar=0.8),n=100)+5
out=envcpt(x) # run the 8 models with
AIC(out) # returns the AIC for each model
which.min(AIC(out)) # gives trendar (model 7) as the best model fit.
out[[7]] # gives the model fit for the trendar model. Notice that the trend is tiny but does
# produce a significantly better fit than the meanar model.
plot(out,type='fit') # plots the fits
plot(out,type="aic") # plots the aic values
## End(Not run)
``` |

EnvCpt documentation built on Jan. 20, 2018, 9:23 a.m.

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