Description Usage Arguments Value Examples

Sample time series using completely at random (MCAR) or at random (MAR)

1 2 | ```
sample_dat(datin, smps = "mcar", repetition = 10, b = 10, blck = 50,
blckper = TRUE, plot = FALSE)
``` |

`datin` |
input numeric vector |

`smps` |
chr sring of sampling type to use, options are |

`repetition` |
numeric for repetitions to be done for each missPercent value |

`b` |
numeric indicating the total amount of missing data as a percentage to remove from the complete time series |

`blck` |
numeric indicating block sizes as a proportion of the sample size for the missing data |

`blckper` |
logical indicating if the value passed to |

`plot` |
logical indicating if a plot is returned showing the sampled data, plots only the first repetition |

Input data with `NA`

values for the sampled observations if `plot = FALSE`

, otherwise a plot showing the missing observations over the complete dataset.

The missing data if `smps = 'mar'`

are based on random sampling by blocks. The start location of each block is random and overlapping blocks are not counted uniquely for the required sample size given by `b`

. Final blocks are truncated to ensure the correct value of `b`

is returned. Blocks are fixed at 1 if the proportion is too small, in which case `"mcar"`

should be used. Block sizes are also truncated to the required sample size if the input value is too large if `blckper = FALSE`

. For the latter case, this is the same as setting `blck = 1`

and `blckper = TRUE`

.

For all cases, the first and last oservation will never be removed to allow comparability of interpolation schemes. This is especially relevant for cases when `b`

is large and `smps = 'mar'`

is used. For example, `method = na.approx`

will have rmse = 0 for a dataset where the removed block includes the last n observations. This result could provide misleading information in comparing methods.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | ```
a <- rnorm(1000)
# default sampling
sample_dat(a)
# use mar sampling
sample_dat(a, smps = 'mar')
# show a plot of one repetition
sample_dat(a, plot = TRUE)
# show a plot of one repetition, mar sampling
sample_dat(a, smps = 'mar', plot = TRUE)
# change plot aesthetics
library(ggplot2)
p <- sample_dat(a, plot = TRUE)
p + scale_colour_manual(values = c('black', 'grey'))
p + theme_minimal()
p + ggtitle('Example of simulating missing data')
``` |

fawda123/imputeTestbench documentation built on Dec. 7, 2017, 3:40 a.m.

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