REGR_SXX

Calculates the linear regression coefficient for the sum of x*x where x and y are not null.

Parameter	Type	Description
`ys`	decimal, double	the independent variable.
`xs`	decimal, double	The dependent variable

Returns: decimal

query:

SELECT REGR_SXX(flux, time_bjd_2454833)
  FROM tabbysstarflux

result:

regr_sxx
41,334,468.87