Regression on the TI-86
Written by Jeff O’Connell – [email protected]
Ohlone College
http://www2.ohlone.edu/people2/joconnell/ti/
Steps:
1) Press [2nd] [LIST] and select [EDIT].
2) Enter the x-coordinates in the xStat column and the y-coordinates in the yStat column.
Note: If there are numbers already in either of the columns then use the arrows to highlight the
name of the column (xstat or ystat) and press [CLEAR] then [ENTER]
3) Once the data have been entered press [EXIT] to get back to the home screen.
4) Press [2nd] [STAT] and select [CALC].
5) Select the regression model you wish to choose according to the table below, then press [2nd]
[LIST] select [NAMES] and chose [xstat] [,] [ystat]. For example, if you want a quadratic
model the command should be P2REG xstat, ystat
6) Press [ENTER] to get the coefficients.
Regression Model
LinR
LnR
ExpR
PwrR
SinR
LgstR
P2REG
P3REG
P4REG
Form of equation
y = ax + b
y = a + b ln x
y = ab x
y = ax b
y = a sin( bx + c) + d
c
y=
1 + ae !b x
y = ax 2 + bx + c
y = ax 3 + bx 2 + cx + d
y = ax 4 + bx 3 + cx 2 + dx + e
Note: For the P2REG, P3REG, and P4REG the coefficients are given as a list. For example, in
a P2REG an answer of {2.3 1.6 0.6} corresponds to the polynomial y = 2.3x 2 +1.6x + 0.6 .