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Defined as sqrt (sum_of_squared_errors / total_sum_of_squares). Undefined for single instances and when every truth value is identical. In this case the output will be NA.
RRSE(truth, response)
[numeric] vector of true values
[numeric] vector of predicted values
# NOT RUN { n = 20 set.seed(123) truth = rnorm(n) response = rnorm(n) RRSE(truth, response) # }
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