ck_params_nums {cellKey}

Set perturbation parameters for continuous variables

Description

This function allows to define perturbation parameters used to perturb cells in magnitude tables.

Usage

ck_params_nums(
  type = "top_contr",
  top_k = NULL,
  ptab,
  mult_params,
  mu_c = 0,
  same_key = TRUE,
  use_zero_rkeys = FALSE,
  path = NULL
)

Arguments

type

a character value defining the way to identify the magnifier, e.g which contributions/values in a cell should be the used in the perturbation procedure. Possible choices are:

• top_contr: the k largest contributions are used. In this case, it is also required to specify argument top_k

• mean: the (weighted) cellmean is used as starting point

• range: the difference between largest and smallest contribution is used.

• sum: the (weighted) cellvalue itself is used as starting point

top_k

it is ignored if variant is different from top_contr. Otherwise, a scalar number ⁠>0⁠ is expected.

ptab

in this argument, one ore more perturbation tables are given as input. the following choices are possible:

• an object derived from ptable::create_ptable() or ptable::create_num_ptable(): this case is the same as specifying a named list with only a single element "all" (as described below)

• a named list where the allowed names are shown below and each element must be the output of [ptable::create_ptable())] or ptable::create_num_ptable()

  • "all": this ptable will be used for all cells; if specified, no elements named "even" or "odd" must exist.

  • "even": will be used to look up perturbation values for cells with an even number of contributors. if specified, also list-element "odd" must exist.

  • "odd": will be used to look up perturbation values for cells with an odd number of contributors; if specified, also list-element "even" must exist.

  • "small_cells": if specified, this ptable will be used to extract perturbation values for very small cells

[ptable::create_ptable())]: R:ptable::create_ptable()) ptable::create_num_ptable(): R:ptable::create_num_ptable()

mult_params

an object derived with ck_flexparams() or ck_simpleparams() that contain required parameters for the computation of the perturbation multiplier

mu_c

fixed extra protection amount (⁠>= 0)⁠ applied to the absolute of the perturbation value of the first (largest) noise component if the cell is sensitive. This value defaults to 0 (no additional protection). Please note that sensitive cells can be defined according using the supp_freq(), supp_val, supp_p(), supp_nk() and supp_pq() methods. An examples is given in ?cellkey_pkg.

same_key

(logical) should original cell key (TRUE) used for for finding perturbation values of the largest contributor to a cell or should a perturbation of the cellkey itself (FALSE) take place.

use_zero_rkeys

(logical) scalar defining if record keys of units not contributing to a specific numeric variables should be used (TRUE) or ignored (FALSE) when computing cell keys.

path

a scalar character specifying a path to which the parameters created with this functions should be written to (in yaml format)

Value

an object suitable as input to method ⁠$params_nums_set()⁠ for the perturbation of continous variables.

See Also

ck_flexparams()

Examples

# create a perturbation table using
# functionality from ptable-pkg; see help(pa = "ptable")
# this returns an extra ptable for very small cells
ptab <- ptable::pt_ex_nums(separation = TRUE)

# create parameters
ck_params_nums(
  type = "top_contr",
  top_k = 3,
  ptab = ptab,
  mult_params = ck_flexparams(
    fp = 1000,
    p = c(0.20, 0.03),
    epsilon = c(1, 0.5, 0.2),
    q = 2),
  use_zero_rkeys = TRUE,
  mu_c = 3)