Type: | Command |
Description: | Predicted |
| the |
| regression coefficients in the reserved variable ΣPAR. |
| The value is predicted using the regression coefficients most recently computed with LR and |
| stored in the reserved variable ΣPAR. For the linear statistical model, the equation used is this: |
| ydependent = (mxindependent) + b |
| where m is the slope (the third element in ΣPAR) and b is the intercept (the fourth element in |
| ΣPAR). |
| 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 ΣPAR, a |
| default value of zero is used for both regression |
| statistical models LINFIT and LOGFIT, and error for statistical models EXPFIT and PWRFIT. |
Access: | …µPREDY |
Input/Output:
Level 1/Argument 1 |
| Level 1/Item 1 |
|
|
|
xindependent | → | ydependent |
Example: Given four columns of data in ΣDAT, the command sequence:
2 XCOL 4 YCOL PWRFIT LR 11 PREDY
sets column 2 as the independent variable column, sets column 4 as the dependent variable column, and sets the power statistical model. It then executes LR, generating intercept and slope regression coefficients, and storing them in ΣPAR. Then, given an independent value of 11, it returns a predicted dependent value based on the regression coefficients and the statistical model.
See also: COLΣ, CORR, COV, EXPFIT, ΣLINE, LINFIT, LOGFIT, LR, PREDX, PWRFIT, XCOL,
YCOL
PREVALType: Function
Description: With respect to the current default variable, returns the difference between the values of a function at two specified values of the variable.
PREVAL can be used in conjunction with INTVX to evaluate definite integrals. See the example below.
Access: Calculus, !ÖDERIV. & INTEG L.
Input: Level 3/Argument 1: A function. Level 2/Argument 2: The lower bound. Level 3/Argument 1: The upper bound. The bounds can be expressions.
Output: The result of the evaluation.
Flags: Exact mode must be set (flag
Example: Evaluate the following:
∫03(x3 + 3x)dx
Command: PREVAL(INTVX(X^3+3*X),0,3)
Full Command and Function Reference