variable_importance: Measure variable importance.

In CellProfiler/cytominer: Methods for Image-Based Cell Profiling

Measure variable importance.

Description

variable_importance measures importance of variables based on specified methods.

Usage

variable_importance(
  sample,
  variables,
  operation = "replicate_correlation",
  ...
)

Arguments

sample	tbl containing sample used to estimate parameters.
variables	character vector specifying observation variables.
operation	optional character string specifying method for computing variable importance. This must be one of the strings "replicate_correlation" (default) or "svd_entropy". is implemented.
...	arguments passed to variable importance operation.

Value

data frame containing variable importance measures.

Examples

set.seed(123)
x1 <- rnorm(10)
x2 <- x1 + rnorm(10) / 100
y1 <- rnorm(10)
y2 <- y1 + rnorm(10) / 10
z1 <- rnorm(10)
z2 <- z1 + rnorm(10) / 1

batch <- rep(rep(1:2, each = 5), 2)

treatment <- rep(1:10, 2)

replicate_id <- rep(1:2, each = 10)

sample <-
  tibble::tibble(
    x = c(x1, x2), y = c(y1, y2), z = c(z1, z2),
    Metadata_treatment = treatment,
    Metadata_replicate_id = replicate_id,
    Metadata_batch = batch
  )

head(sample)

# `replicate_correlation`` returns the median, min, and max
# replicate correlation (across batches) per variable
variable_importance(
  sample = sample,
  variables = c("x", "y", "z"),
  operation = "replicate_correlation",
  strata = c("Metadata_treatment"),
  replicates = 2,
  split_by = "Metadata_batch",
  replicate_by = "Metadata_replicate_id",
  cores = 1
)

# `svd_entropy`` measures the contribution of each variable in decreasing
# the data entropy.

variable_importance(
  sample = sample,
  variables = c("x", "y", "z"),
  operation = "svd_entropy",
  cores = 1
)

CellProfiler/cytominer documentation built on July 2, 2023, 6:19 p.m.