Keithley 4200A-SCS

Section
6: Clarius Model 4200A-SCS Parameter Analyzer
Reference Manual
6-260 4200A-901-01 Rev. C / February 2017
REGFIT Formulator function
Performs a linear regression fit.
Usage
REGFIT(VX, VY, STARTPOS, ENDPOS)
VX
The name of any column (vector) listed under Columns
VY
The name of any column (vector) listed under Columns
STARTPOS
For the range of X and Y values to be fitted, the row number (index) of the starting
values
ENDPOS
For the range of X and Y values to be fitted, the row number (index) of the ending
values
Details
Performs a linear regression fit as follows:
• Fits the following relationship, of the form Y = a + bX, to a specified range of values in two
columns (vectors) (column VX containing X values and column VY containing Y values):
Y = REGFITYINT + REGFITSLP * X
where REGFITSLP and REGFITYINT are slope and Y-intercept constants.
• Using the above linear relationship, returns a new column (vector) containing Y values calculated
from all X values in column VX.
If a VX or VY value at either STARTPOS or ENDPOS is an invalid number (that is, the value is #REF),
the function will not return a valid result.
Example
COLLECTORFIT = REGFIT(COLLECTORV, COLLECTORI, 25, LASTPOS(COLLECTORV))
Also see
REGFITSLP (on page 6-261)
REGFITYINT (on page 6-263)