Hp 48g Graphing Calculator Manual do Utilizador descarregar pdf (Página 281)

100

101

4. Hig

Enter the column number where the data to be converted is

located.

it the field and enter the minimum value that a

datum can be and still be considered to lie within a bin. All lower

values are considered outliers.

Enter the number of bins to use into the iE'IH COUNT; field.

Enter the width of each bin into the BIN WIETTH; field. All bins

are of equal width.

Press UK to perform the conversion. On level 2 of the stack,

you will see an array with integer elements, each one representing

the number of data points that fell into each bin (in order

from lowest to highest). On level 1 of the stack, you will see a

two-element vector displaying the number of outliers. The first

element represents the outliers below the lowest bin, and the second

element represents the outliers above the highest bin.

To plot a histogram using the frequencies:

1. Convert the data, set into frequencies as in the previous procedure.

2. Press Q to deleti' the outlier vector.

3. Press OdED Q SDFiT to store the frequency data in

EDAT.

4. Press f^fSTAfl FN....UT BFiRF'L to plot the frequencies.

Fitting a Model to a Set of Data

The HP 48 ca.u use any of four general regression models in the

attempt i.o quantify the relationship between the data in two columns

from the current statistical matrix (UDAT):

L1 rv:; Fi

y = h + mx

■ iciic y — h-\-m\nx.

F i t

Exporient y = or Inj/ = In h + mx

Fit

F-'owe?r F i t y =■ bx"^' or In y = In 6 4- m In ,e

For each of these general models the regression tool will find an

intercept (6) and a slope (m) that corresponds to the least-squares fit

Statistics and Data Analysis 21-9

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