Sharp EL-5230 - Manual (Page 63)

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Chapter 4:
Statistical Calculations
The STAT mode is used to perform statistical calculations.
Press b 1 to select the statistics mode. The seven statistical
calculations listed below can be performed. After selecting the statistics
mode, select the desired sub-mode by pressing the number key that
corresponds to your choice.
To change statistical sub-mode, reselect statistics mode (press b 1),
then select the required sub-mode.
0 (SD) : Single-variable statistics
1 (LINE) : Linear regression calculation
2 (QUAD) : Quadratic regression calculation
3 (EXP) : Exponential regression calculation
4 (LOG) : Logarithmic regression calculation
5 (POWER) : Power regression calculation
6 (INV) : Inverse regression calculation