REGR_AVGX

Calculates the linear regression coefficient for the average of 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_AVGX(flux, time_bjd_2454833)
  FROM tabbysstarflux

result:

regr_avgx
763.46