calcAgreement {rliger}

Calculate agreement metric after integration

Description

This metric quantifies how much the factorization and alignment distorts the geometry of the original datasets. The greater the agreement, the less distortion of geometry there is. This is calculated by performing dimensionality reduction on the original and quantile aligned (or just factorized) datasets, and measuring similarity between the k nearest neighbors for each cell in original and aligned datasets. The Jaccard index is used to quantify similarity, and is the final metric averages across all cells.

Note that for most datasets, the greater the chosen nNeighbor, the greater the agreement in general. Although agreement can theoretically approach 1, in practice it is usually no higher than 0.2-0.3.

Usage

calcAgreement(
  object,
  ndims = 40,
  nNeighbors = 15,
  useRaw = FALSE,
  byDataset = FALSE,
  seed = 1,
  dr.method = NULL,
  k = nNeighbors,
  use.aligned = NULL,
  rand.seed = seed,
  by.dataset = byDataset
)

Arguments

object

liger object. Should call quantile_norm before calling.

ndims

Number of factors to produce in NMF. Default 40.

nNeighbors

Number of nearest neighbors to use in calculating Jaccard index. Default 15.

useRaw

Whether to evaluate just factorized H matrices instead of using quantile aligned H.norm matrix. Default FALSE uses aligned matrix.

byDataset

Whether to return agreement calculated for each dataset instead of the average for all datasets. Default FALSE.

seed

Random seed to allow reproducible results. Default 1.

dr.method

[defunct] We no longer support other methods but just NMF.

k, rand.seed, by.dataset

[Deprecated] See Usage for replacement.

use.aligned

[defunct] Use useRaw instead.

Value

A numeric vector of agreement metric. A single value if byDataset = FALSE or each dataset a value otherwise.

Examples

if (requireNamespace("RcppPlanc", quietly = TRUE)) {
    pbmc <- pbmc %>%
    normalize %>%
    selectGenes %>%
    scaleNotCenter %>%
    runINMF %>%
    quantileNorm
    calcAgreement(pbmc)
}