Section 6: Clarius
Model 4200A-SCS Parameter Analyzer Reference Manual
6-258
4200A-901-01 Rev. C / February 2017
POLY2FIT Formulator function
Enables quadratic regression line fitting.
Usage
POLY2COEFF(
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
The row number (index) of the first set of X and Y values
ENDPOS
The row number (index) of the second set of X and Y values
Details
Enables quadratic regression line fitting. It allows a set of data to best fit an equation of the parabola
Y = a
X
2
+ b
X
+ c.
The
a
,
b
, and
c
values of the quadratic equation are returned.
The quadratic regression line fit functions are useful for deriving the defect density when you use the
drive-level capacitance profiling (DLCP) technique.
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.
Also see
(on page 6-257)
