metrica (version 2.1.0)

MLP: Mean Lack of Precision (MLP)

Description

It estimates the MLP, the unsystematic error component to the Mean Squared Error (MSE), for a continuous predicted-observed dataset following Correndo et al. (2021).

Usage

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

Value

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

The MLP represents the unsystematic (random) component of the MSE. It is obtained via a symmetric decomposition of the MSE (invariant to predicted-observed orientation) using a symmetric regression line. The MLP is equal to the sum of unsystematic differences divided by the sample size (n). The greater the value the greater the random noise of the predictions. For the formula and more details, see online-documentation

References

Correndo et al. (2021). Revisiting linear regression to test agreement in continuous predicted-observed datasets. Agric. Syst. 192, 103194. tools:::Rd_expr_doi("10.1016/j.agsy.2021.103194")

Examples

# \donttest{
set.seed(1)
X <- rnorm(n = 100, mean = 0, sd = 10)
Y <- X + rnorm(n=100, mean = 0, sd = 3)
MLP(obs = X, pred = Y)
# }