sigma_x

Format:

sigma_x( scan_id)

Result:

Number

Description:

Returns the standard deviations of the x values of a SCAN. It is calculated using this formula:

$$\sigma_x = \sqrt{ \frac{ \sum_{i=1}^{n} y_i * (x_i - \overline{x})^2} {\sum_{i=1}^{n} y_i }}$$

$n$ is the current index of the SCAN.