Preval; Prevprime - HP 48gII Advanced User's Reference Manual

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Description: Predicted x-Value Command: Returns the predicted independent-variable value x
on the dependent-variable value y
regression coefficients in the reserved variable PAR.
The value is predicted using the regression coefficients most recently computed with LR and
stored in the reserved variable PAR. For the linear statistical model, the equation used is this:
where m is the slope (the third element in PAR) and b is the intercept (the fourth element in
PAR).
For the other statistical models, the equations used by PREDX are listed in the LR entry.
If PREDX is executed without having previously generated regression coefficients in PAR, a
default value of zero is used for both regression coefficients, and an error results.
...µ
Access:
Input/Output:
See also:
COL , CORR, COV, EXPFIT, LINE, LINFIT, LOGFIT, LR, PREDY, PWRFIT, XCOL,
YCOL
PREDY
Type:
Command
Description: Predicted y-Value Command: Returns the predicted dependent-variable value y
the independent-variable value x
regression coefficients in the reserved variable PAR.
The value is predicted using the regression coefficients most recently computed with LR and
stored in the reserved variable PAR. For the linear statistical model, the equation used is this:
where m is the slope (the third element in PAR) and b is the intercept (the fourth element in
PAR).
For the other statistical models, the equations used by PREDY are listed in the LR entry.
If PREDY is executed without having previously generated regression coefficients in PAR, a
default value of zero is used for both regression coefficients–in this case PREDY will return 0
for statistical models LINFIT and LOGFIT, and error for statistical models EXPFIT and
PWRFIT.
...µ
Access:
Input/Output:
See also:
COL , CORR, COV, EXPFIT, LINE, LINFIT, LOGFIT, LR, PREDX, PWRFIT, XCOL,
YCOL

PREVAL

CAS:
Return difference between values of a function at two specified values of the current variable.

PREVPRIME

CAS:
Given an integer, find the closest prime number smaller than the integer.
dependent
y
dependent
PREDX
Level 1/Argument 1
y
dependent
independent
y
dependent
PREDY
Level 1/Argument 1
x
independent
, the currently selected statistical model, and the current
= (mx
) + b
independent
, the currently selected statistical model, and the current
= (mx
) + b
independent
Full Command and Function Reference 3-127
, based
independent
Level 1/Item 1
x
independent
, based on
dependent
Level 1/Item 1
y
dependent

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