# P&K 3950

## Function and Significance test

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With selection of the function f(x) or the button "**Auto f(x)**" a significance checking between the polynom formula of the first (linear regression) and the second order (quadratic regression) is performed and the quadratic formula is selected, if it is significantly (with a

**Settings and data fields**

- The determination coefficient for linear and quadratic regression according to
HARTUNG, page 579 and 593 - Distribution according to
VDI 3950, part 1 equations 5 and 27 - Regression equation
- X- and Y-average values
- Number of measuring points
- A, B and C, the coefficients in the regression equation
- Statistical certainty
- Share of the population (1-Gamma)

**Inquiry block**

- x value
- y value at x
- y + confidence interval at x
- y - confidence interval at x
- y + tolerance interval at x
- y - tolerance interval at x

**Additional setting possibilities**

- Set coefficients manually
- Show calculated data graph
- Show confidence interval in the graphic
- Show tolerance interval in the graphic

see

4.1 Function and significance test

4.2 Confidence and tolerance interval

4.3 Value inquiry

4.4 Additional data regression curve