Protect two tables with common cells

protect_linked_tables() can be used to protect tables that have common cells. It is of course required that after the anonymization process has finished, all common cells have the same anonymization state in both tables.

Usage

protectLinkedTables(
  objectA,
  objectB,
  commonCells,
  method = "SIMPLEHEURISTIC",
  ...
)

protect_linked_tables(x, y, common_cells, method = "SIMPLEHEURISTIC", ...)

Arguments

objectA

maps to argument x in protect_linked_tables()

objectB

maps to argument y in protect_linked_tables()

commonCells

maps to argument common_cells in protect_linked_tables()

method

which protection algorithm should be used; choices are "SIMPLEHEURISTIC" and "SIMPLEHEURISTIC_OLD"

...

additional arguments to control the secondary cell suppression algorithm. For details, see protectTable().

x

a sdcProblem object

y

a sdcProblem object

common_cells

a list object defining common cells in x and y. For each variable that has one or more common codes in both tables, a list element needs to be specified.

• List-elements of length 3: Variable has exact same levels and structure in both input tables

  • first element: scalar character vector specifying the variable name in argument x

  • second element: scalar character vector specifying the variable name in argument y

  • third element: scalar character vector being with keyword "ALL"

• List-elements of length 4: Variable has different codes and levels in inputs x and y

  • first element: scalar character vector specifying the variable name in argument x

  • second element: scalar character vector specifying the variable name in argument y

  • third element: character vector defining codes within x

  • fourth element: character vector with length that equals the length of the third list-element. This vector defines codes of the dimensional variable in y that match the codes given in the third list-element for x.

Value

a list elements x and y containing protected sdcProblem objects

See also

protectTable()

Author

Bernhard Meindl bernhard.meindl@statistik.gv.at

Examples

if (FALSE) { # \dontrun{
# load micro data for further processing
utils::data("microdata2", package = "sdcTable")

# table1: defined by variables 'gender' and 'ecoOld'
md1 <- microdata2[,c(2,3,5)]

# table2: defined by variables 'region', 'gender' and 'ecoNew'
md2 <- microdata2[,c(1,2,4,5)]

# we need to create information on the hierarchies
# variable 'region': exists only in md2
d_region <- hier_create(root = "Tot", nodes = c("R1", "R2"))

# variable 'gender': exists in both datasets
d_gender <- hier_create(root = "Tot", nodes = c("m", "f"))

# variable 'eco1': exists only in md1
d_eco1 <- hier_create(root = "Tot", nodes = c("A", "B"))
d_eco1 <- hier_add(d_eco1, root = "A", nodes = c("Aa", "Ab"))
d_eco1 <- hier_add(d_eco1, root = "B", nodes = c("Ba", "Bb"))

# variable 'ecoNew': exists only in md2
d_eco2 <- hier_create(root = "Tot", nodes = c("C", "D"))
d_eco2 <- hier_add(d_eco2, root = "C", nodes = c("Ca", "Cb", "Cc"))
d_eco2 <- hier_add(d_eco2, root = "D", nodes = c("Da", "Db", "Dc"))

# creating objects holding information on dimensions
dl1 <- list(gender = d_gender, ecoOld = d_eco1)
dl2 <- list(region = d_region, gender = d_gender, ecoNew = d_eco2)

# creating input objects for further processing.
# For details, see ?makeProblem.
p1 <- makeProblem(
  data = md1,
  dimList = dl1,
  dimVarInd = 1:2,
  numVarInd = 3)

p2 <- makeProblem(
  data = md2,
  dimList = dl2,
  dimVarInd = 1:3,
  numVarInd = 4)

# the cell specified by gender == "Tot" and ecoOld == "A"
# is one of the common cells! -> we mark it as primary suppression
p1 <- change_cellstatus(
  object = p1,
  specs = data.frame(gender = "Tot", ecoOld = "A"),
  rule = "u",
  verbose = FALSE)

# the cell specified by region == "Tot" and gender == "f" and ecoNew == "C"
# is one of the common cells! -> we mark it as primary suppression
p2 <- change_cellstatus(
  object = p2,
  specs = data.frame(region = "Tot", gender = "f", ecoNew = "C"),
  rule = "u",
  verbose = FALSE)

# specifying input to define common cells
common_cells <- list()

# variable "gender"
common_cells$v.gender <- list()
common_cells$v.gender[[1]] <- "gender" # variable name in "p1"
common_cells$v.gender[[2]] <- "gender" # variable name in "p2"

# "gender" has equal characteristics on both datasets -> keyword "ALL"
common_cells$v.gender[[3]] <- "ALL"

# variables: "ecoOld" and "ecoNew"
common_cells$v.eco <- list()
common_cells$v.eco[[1]] <- "ecoOld" # variable name in "p1"
common_cells$v.eco[[2]] <- "ecoNew" # variable name in "p2"

# vector of common characteristics:
# "A" and "B" in variable "ecoOld" in "p1"
common_cells$v.eco[[3]] <- c("A", "B")

# correspond to codes "C" and "D" in variable "ecoNew" in "p2"
common_cells$v.eco[[4]] <- c("C", "D")

# protect the linked data
result <- protect_linked_tables(
  x = p1,
  y = p2,
  common_cells = common_cells,
  verbose = TRUE)

# having a look at the results
result_tab1 <- result$x
result_tab2 <- result$y
summary(result_tab1)
summary(result_tab2)
} # }