MBE function

Mean Bias Error (MBE)

It estimates the MBE for a continuous predicted-observed dataset.

MBE(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.

Returns

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

Details

The MBE is one of the most widely used error metrics. It presents the same units than the response variable, and it is unbounded. It can be simply estimated as the difference between the means of predictions and observations. The closer to zero the better. Negative values indicate overestimation. Positive values indicate general underestimation. The disadvantages are that is only sensitive to additional bias, so the MBE may mask a poor performance if overestimation and underestimation co-exist (a type of proportional bias). For the formula and more details, see online-documentation

Examples

set.seed(1)
X <- rnorm(n = 100, mean = 0, sd = 10)
Y <- X + rnorm(n=100, mean = 0, sd = 3)
MBE(obs = X, pred = Y)