Sharp EL-5230, EL-5250 Data Entry and Correction, Quadratic regression calculation, Data entry

Chapter 4: Statistical Calculations

Quadratic regression calculation

Statistics of 1 and 2 and coefficients a, b, c in the quadratic regression formula (y = a + bx + cx2). (For quadratic regression calculations, no correla- tion coefficient (r) can be obtained.)

Data Entry and Correction

All data entered is kept in memory until STAT memory clear (@ P

2y) is operated or a new STAT sub-mode is selected. Before entering new data, clear the memory contents.

Data entry

Single-variable data

Data _

Data , frequency _ (To enter multiples of the same data)

Two-variable data

Data x , Data y _

Data x , Data y , frequency _ (To enter multiples of the same data x and y.)

•Up to 100 data items can be entered. With single-variable data, a data item without frequency assignment is counted as one data item, while an item assigned with frequency is stored as a set of two data items. With two- variable data, a set of data items without a frequency assignment is counted as two data items, while a set of items assigned with frequency is stored as a set of three data items.

Data correction

Correction prior to pressing _ immediately after a data entry:

Delete incorrect data with j, then enter the correct data.

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