Description Usage Arguments Value Examples
View source: R/ck_cnt_measures.R
This function computes utility/information loss measures based on two numeric vectors (original and perturbed)
1  ck_cnt_measures(orig, pert, exclude_zeros = TRUE)

orig 
a numeric vector holding original values 
pert 
a numeric vector holding perturbed values 
exclude_zeros 
a scalar logical value; if 
a list
containing the following elements:
overview
: a data.table
with the following three columns:
noise
: amount of noise computed as orig
 pert
cnt
: number of cells perturbed with the value given in column noise
pct
: percentage of cells perturbed with the value given in column noise
measures
: a data.table
containing measures of the distribution
of three different distances between original and perturbed values
of the unweighted counts. Column what
specifies the computed measure.
The three distances considered are:
d1
: absolute distance between original and masked values
d2
: relative absolute distance between original and masked values
d3
: absolute distance between squareroots of original and perturbed
values
cumdistr_d1
, cumdistr_d2
and cumdistr_d3
: for each distance d1
, d2
and d3
, a data.table
with the following three columns:
cat
: a specific value (for d1
) or interval (for distances d2
and d3
)
cnt
: number of records smaller or equal the value in column cat
for the
given distance
pct
: proportion of records smaller or equal the value
in column cat
for the selected distance
false_zero
: number of cells that were perturbed to zero
false_nonzero
: number of cells that were initially zero but
have been perturbed to a number different from zero
exclude_zeros
: were empty cells exluded from computation or not
1 2 3 4 5 6 7 8 9 10  orig < c(1:10, 0, 0)
pert < orig; pert[c(1, 5, 7)] < c(0, 6, 9)
# ignore empty cells when computing measures `d1`, `d2`, `d3`
ck_cnt_measures(orig = orig, pert = pert, exclude_zeros = TRUE)
# use all cells
ck_cnt_measures(orig = orig, pert = pert, exclude_zeros = FALSE)
# for an application on a perturbed object, see ?cellkey_pkg

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