HP 10413 Datasheet download pdf (Page 143)

143

New columns as functions of old

As with univariate statistics, you can use

functions of old columns as new sets of data.

See the Univariate version of this section for

two different ways of doing this.

For example, a set of data (C1,C2) that you suspect is exponential could be

straightened by setting up S2: as (C1,LN(C2)).

The effects of changes of scale and origin on data and summary statistics

can be investigated in this way by storing (say) -2*C2+3 into C2. You can

even combine columns in this way, such as storing C1+C2 into C3.

Using values from in calculations

It is often useful to be able to retrieve values such as the mean and standard

deviation for use in further calculations. With most simpler calculators these

values are found by pressing keys rather than reading from a screen,

so doing a calculation like ‘multiply the mean by 3.5’ is not hard. The values

shown on the screen can also be retrieved for use on the hp 39g+

relatively easily.

For example, the set of data below contains a suspected outlier (erroneous

value). In this case one might suspect a missing comma.

{2, 3, 5, 2, 1, 5, 3, 6, 7, -2, 3, 5, 5, 55}

A common test for outliers is to calculate the

mean and standard deviation without the

presence of the suspected outlier, and then to

check whether the suspect piece of data is

within three standard deviations of the mean.

If not, then it is discarded.

Enter the data without the suspected outlier into column C1 with the

calculator in mode. Ensure that the SYMB view is set up correctly and

then press the key.

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HP 10413 Datasheet Page 143