# CorrDiff: Calculate correlation difference between a forecast and a reference forecast, and assess uncertainty

## Description

Calculate correlation difference between a forecast and a reference forecast, and assess uncertainty

## Usage

CorrDiff(
fcst,
fcst.ref,
obs,
N.eff = NA,
conf.level = 0.95,
handle.na = "na.fail"
)

## Arguments

fcst.ref

vector of reference forecasts

N.eff

user-defined effective sample size to be used in hypothesis test and for confidence bounds; if NA, the length of `obs` is used after removing missing values; default: NA

conf.level

confidence level for the confidence interval; default = 0.95

handle.na

how should missing values in forecasts and observations be handled; possible values are 'na.fail' and 'only.complete.triplets'; default: 'na.fail'

## Value

vector with correlation difference, one-sided p-value, and central confidence interval at the user-defined confidence level

## References

Steiger (1980): Tests for comparing elements of a correlation matrix. Psychological Bulletin. 10.1037/0033-2909.87.2.245
Zou (2007): Toward using confidence intervals to compare correlations. Psychological Methods. 10.1037/1082-989X.12.4.399

## Examples

# NOT RUN {
data(eurotempforecast)
CorrDiff(rowMeans(ens), ens[, 1], obs)
# }