HP 40g hp 39g+ (39g & 40g)_mastering the hp 39g+_English_E_F2224-90010.pdf - Page 134
Sorting paired columns, Specifying the fit model, Multiple data sets, ALPHA, APLET
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If you have more than one data set displayed on the screen then the up/down arrows move from one set to the other, unless the fit line is also showing in which case the behavior is slightly different. Information is given later on how to display the fit curve and to choose the type of curve. As usual, the key produces a list of further options. The key labeled inserts space for a new number by shifting all the numbers down one space. If working with bivariate data you will need to also insert into the paired column. Sorting paired columns The option is capable of dealing with bivariate data if you are careful to enter the column number of the dependent column into the appropriate space. The key will pop up a list of columns from which to choose, or you can use the ALPHA key. Specifying the fit model Although we bypassed it in the previous example, part of the procedure in dealing with bivariate data is to specify the relationships between columns before plotting. This is done via the SYMB view as it is for univariate data. Multiple data sets The S1:, S2: ... refer to data sets 1, 2... This allows you to display more than one set of bivariate data by specifying the columns for each set. Columns can be used in more than one set. Note that a 'C' screen key is provided for your convenience. The screen above shows the default setup when you the aplet in the APLET view. It specifies that columns C1 and C2 are paired and that a linear fit (m*X + b) is to be used when calculating a line of best fit. This was all that was required for our previous example and so I bypassed that step for simplicity. If you intend to use other columns then you must register them in the SYMB view. For example, to use data entered into C3 and C4 you must register them as shown. 134