HP 10413 Datasheet download pdf (Page 254)

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PREDY(x-val)

This function predicts the y value for a pair of columns set up as bivariate

data in the Statistics aplet. This is discussed in more detail in the section

covering the Statistics aplet, but a brief summary will be given here.

It assumes that:

(i) the bivariate data is entered into a pair of columns (eg. C1 and C2, with C1

containing the independent data and C2 the dependent data),

and (ii) that these two columns have been specified in the SYMB view to be paired

bivariate data,

and (iii) that this data set has been graphed in the PLOT view and that the FIT screen

key has been used to plot the line of best fit for the pair of columns,

If these conditions are satisfied then the

function PREDY(3.5) will produce a predicted

y (dependent) value for the x (indep.) value of

35⋅ .

Calculator Tip

The line of best fit used in the function PREDY is whichever

one was last plotted. It is up to you to ensure that this is in

fact the one you want used! It is far easier and more

reliable to use the facilities provided in the PLOT view (see

page 140) to calculate PREDY values.

PREDX(y-val)

The PREDX function simply reverses the line of best fit. For example, the

equation

0 8199 1 1662YX=⋅ +⋅

earlier would use

( 1.1662)

0.8199

−

to predict

the X values.

Note: See page 146 for important information on this function.

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HP 10413 Datasheet Page 254