Hp 49g+ User Manual download pdf (Page 585)

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The FIT sub-menu

The FIT sub-menu contains functions used to fit equations to the data in

columns Xcol and Ycol of the ΣDATA matrix.

The functions available in this sub-menu are:

ΣLINE: provides the equation corresponding to the most recent fitting.

LR: provides intercept and slope of most recent fitting.

PREDX: used as y @PREDX, given y find x for the fitting y = f(x).

PREDY: used as x @PREDY, given x find y for the fitting y = f(x).

CORR: provides the correlation coefficient for the most recent fitting.

COV: provides sample co-variance for the most recent fitting

PCOV: shows population co-variance for the most recent fitting.

The SUMS sub-menu

The SUMS sub-menu contains functions used to obtain summary statistics of

the data in columns Xcol and Ycol of the ΣDATA matrix.

ΣX : provides the sum of values in Xcol column.

ΣY : provides the sum of values in Ycol column.

ΣX^2 : provides the sum of squares of values in Xcol column.

ΣY^2 : provides the sum of squares of values in Ycol column.

ΣX*Y: provides the sum of x⋅y, i.e., the products of data in columns Xcol and

Ycol.

NΣ : provides the number of columns in the ΣDATA matrix.

Example of STAT menu operations

Let ΣDATA be the matrix shown in next page.

• Type the matrix in level 1 of the stack by using the Matrix Writer.

• To store the matrix into ΣDATA, use: @)DATA „ @£DAT

1 2 ... 580 581 582 583 584 585 586 587 588 589 590 ... 861 862

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Hp 49g+ User Manual Page 585

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