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

View source: R/recombine_transforms.R

Bag of little bootstraps transformation method

1 | ```
drBLB(x, statistic, metric, R, n)
``` |

`x` |
a subset of a ddf |

`statistic` |
a function to apply to the subset specifying the statistic to compute. Must have arguments 'data' and 'weights' - see details). Must return a vector, where each element is a statistic of interest. |

`metric` |
a function specifying the metric to be applied to the |

`R` |
the number of bootstrap samples |

`n` |
the total number of observations in the data |

It is necessary to specify `weights`

as a parameter to the `statistic`

function because for BLB to work efficiently, it must resample each time with a sample of size `n`

. To make this computationally possible for very large `n`

, we can use `weights`

(see reference for details). Therefore, only methods with a weights option can legitimately be used here.

Ryan Hafen

Kleiner, Ariel, et al. "A scalable bootstrap for massive data." Journal of the Royal Statistical Society: Series B (Statistical Methodology) 76.4 (2014): 795-816.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ```
## Not run:
# BLB is meant to run on random replicate divisions
rrAdult <- divide(adult, by = rrDiv(1000), update = TRUE)
adultBlb <- rrAdult %>% addTransform(function(x) {
drBLB(x,
statistic = function(x, weights)
coef(glm(incomebin ~ educationnum + hoursperweek + sex,
data = x, weights = weights, family = binomial())),
metric = function(x)
quantile(x, c(0.05, 0.95)),
R = 100,
n = nrow(rrAdult)
)
})
# compute the mean of the resulting CI limits
# (this will take a little bit of time because of resampling)
coefs <- recombine(adultBlb, combMean)
matrix(coefs, ncol = 2, byrow = TRUE)
## End(Not run)
``` |

datadr documentation built on May 30, 2017, 5:46 a.m.

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