Appendix A: Tables and Reference Information 155
•ZXmin, ZXmax, ZXscl, ZTstep, ZPlotStart, Zu(nMin), and other
ZOOM variables.
The variables below are reserved for use by the TI-84 Plus. You cannot
store to them.
n, v, Sx, sx, minX, maxX, Gy, Gy2, Gxy, a, b, c, RegEQ, x1, x2, y1, z, t, F,
c2, Ç, v1, Sx1, n1, lower, upper, r2, R2 and other statistical variables.
Statistics Formulas
This section contains statistics formulas for the Logistic and SinReg
regressions, ANOVA, 2-SampÜTest, and 2-SampTTest.

Logistic

The logistic regression algorithm applies nonlinear recursive least-squares
techniques to optimize the following cost function:
which is the sum of the squares of the residual errors,
This technique attempts to estimate the constants a, b, and c recursively
to make J as small as possible.

SinReg

The sine regression algorithm applies nonlinear recursive least-squares
techniques to optimize the following cost function:
which is the sum of the squares of the residual errors,
This technique attempts to recursively estimate the constants a, b, c, and
d to make J as small as possible.
where: x
y
N
=
=
=
the independent variable list
the dependent variable list
the dimension of the lists
where: x
y
N
=
=
=
the independent variable list
the dependent variable list
the dimension of the lists

Jc

1ae bxi

–

+

-----------------------yi

–





2
i1=
N
∑

=

Jasin bxic+()dy

i

–+[]

2
i1=
N
∑

=