Description Arguments References
The normalized standard deviation of the slope (sigma) is one of the five criterion for detecting clear points. It is defined as follows:
σ = \frac{1}{ {\overline{GHI}} } √{ \frac{1}{n-1} ∑_{i=1}^{n-1} (s_{i} {\overline{s}})^2 }
where {\overline{GHI}} is the mean of the measured irradiance values, s_{i} = GHI_{i+1} - GHI_{i} and {\overline{s}} is the sample standard deviation of s.
x |
Numeric vector of measured irradiance. |
Global Horizontal Irradiance Clear Sky Models: Implementation and Analysis, Reno et al, 2012, pp. 30.
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