d1: Modified Index of Agreement (d1).

In metrica: Prediction Performance Metrics

Modified Index of Agreement (d1).

Description

It estimates the modified index of agreement (d1) using absolute differences following Willmott et al. (1985).

Usage

d1(data = NULL, obs, pred, tidy = FALSE, na.rm = TRUE)

Arguments

data	(Optional) argument to call an existing data frame containing the data.
obs	Vector with observed values (numeric).
pred	Vector with predicted values (numeric).
tidy	Logical operator (TRUE/FALSE) to decide the type of return. TRUE returns a data.frame, FALSE returns a list; Default : FALSE.
na.rm	Logic argument to remove rows with missing values (NA). Default is na.rm = TRUE.

Details

Similar to d, the d1 index it is a normalized, dimensionless metric that tests general agreement. The difference with d, is that d1 uses absolute residuals instead of squared residuals. It is bounded between 0 and 1. The disadvantage is that d is an asymmetric index, that is, dependent to the orientation of predicted and observed values. For the formula and more details, see online-documentation

Value

an object of class numeric within a list (if tidy = FALSE) or within a ⁠data frame⁠ (if tidy = TRUE).

References

Willmott et al. (1985). Statistics for the evaluation and comparison of models. J. Geophys. Res. 90, 8995. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1029/jc090ic05p08995")}

Examples

set.seed(1)
X <- rnorm(n = 100, mean = 0, sd = 10)
Y <- rnorm(n = 100, mean = 0, sd = 9)
d1(obs = X, pred = Y)

metrica documentation built on June 30, 2024, 5:07 p.m.