olink_normalization_subset: Subset normalization of all proteins between two NPX...

In OlinkAnalyze: Facilitate Analysis of Proteomic Data from Olink

Subset normalization of all proteins between two NPX projects.

Description

Normalizes two NPX projects (data frames) using all or a subset of samples.

Usage

olink_normalization_subset(
  project_1_df,
  project_2_df,
  reference_samples,
  project_1_name = "P1",
  project_2_name = "P2",
  project_ref_name = "P1"
)

Arguments

project_1_df	Data frame of the first project (required).
project_2_df	Data frame of the second project (required).
reference_samples	Named list of 2 arrays containing SampleID of the subset of samples to be used for the calculation of median NPX within each project. The names of the two arrays should be DF1 and DF2 corresponding to projects 1 and 2, respectively. Arrays do not need to be of equal length and the order the samples appear in does not play any role. (required)
project_1_name	Name of the first project (default: P1).
project_2_name	Name of the second project (default: P2).
project_ref_name	Name of the project to be used as reference set. Needs to be one of the project_1_name or project_2_name. It marks the project to which the other project will be adjusted to (default: P1).

Details

This function is a wrapper of olink_normalization.

In subset normalization one of the projects is adjusted to another using a subset of all samples from each. Please note that the subsets of samples are not expected to be replicates of each other or to have the SampleID. Adjustment between the two projects is made using the assay-specific differences in median between the subsets of samples from the two projects. The two data frames are inputs project_1_df and project_2_df, the one being adjusted to is specified in the input project_ref_name and the shared samples are specified in reference_samples.

A special case of subset normalization is to use all samples (except control samples) from each project as a subset.

Value

A "tibble" of NPX data in long format containing normalized NPX values, including adjustment factors and name of project.

Examples

#### Subset normalization

# datasets
npx_df1 <- npx_data1 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::select(-Project) |>
  dplyr::mutate(Normalization = "Intensity")
npx_df2 <- npx_data2 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::select(-Project) |>
  dplyr::mutate(Normalization = "Intensity")

# Find a suitable subset of samples from both projects, but exclude Olink
# controls and samples that fail QC.
df1_samples <- npx_df1 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::filter(QC_Warning == 'Pass') |>
  dplyr::pull(SampleID) |>
  unique() |>
  sample(size = 16, replace = FALSE)
df2_samples <- npx_df2 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::filter(QC_Warning == 'Pass') |>
  dplyr::pull(SampleID) |>
  unique() |>
  sample(size = 16, replace = FALSE)

# create named list
subset_samples_list <- list("DF1" = df1_samples,
                            "DF2" = df2_samples)

# Normalize
olink_normalization_subset(project_1_df = npx_df1,
                           project_2_df = npx_df2,
                           reference_samples = subset_samples_list,
                           project_1_name = "P1",
                           project_2_name = "P2",
                           project_ref_name = "P1")


#### Special case of subset normalization using all samples

# datasets
npx_df1 <- npx_data1 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::select(-Project) |>
  dplyr::mutate(Normalization = "Intensity")
npx_df2 <- npx_data2 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::select(-Project) |>
  dplyr::mutate(Normalization = "Intensity")

# Find a suitable subset of samples from both projects, but exclude Olink
# controls and samples that fail QC.
df1_samples_all <- npx_df1 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::pull(SampleID) |>
  unique()
df2_samples_all <- npx_df2 |>
  dplyr::filter(!stringr::str_detect(SampleID, "CONTROL_")) |>
  dplyr::pull(SampleID) |>
  unique()

# create named list
subset_samples_all_list <- list("DF1" = df1_samples_all,
                            "DF2" = df2_samples_all)

# Normalize
olink_normalization_subset(project_1_df = npx_df1,
                           project_2_df = npx_df2,
                           reference_samples = subset_samples_all_list,
                           project_1_name = "P1",
                           project_2_name = "P2",
                           project_ref_name = "P1")

OlinkAnalyze documentation built on Nov. 4, 2023, 1:07 a.m.