Casio fx-CG20 MSe, MSe, MSe, MSe, MSe, MSe, MSe, MSe, Mean square error (MSe), Correlation coefficient (r), Coefficient of determination (r2)

uCalculation of the Correlation Coefficient (r), Coefficient of Determination (r2) and Mean Square Error (MSe)

After the regression formula parameters on the regression calculation result screen, the following parameters also appear on the display. The parameters that appear depend on the regression formula.

Correlation coefficient (r)

Displayed following: linear regression, logarithmic regression, exponential regression, or power regression calculation.

Coefficient of determination (r2)

Displayed following: linear regression, quadratic regression, cubic regression, quartic regression, logarithmic regression, exponential regression, power regression calculation.

Mean square error (MSe)

Displayed following any regression calculation except Med-Med.

Depending on the regression calculation type, mean square error (MSe) is obtained using the following formulas.

• Linear Regression (ax + b).............	MSe =
(a + bx).............	MSe =
• Quadratic Regression.....................	MSe =
• Cubic Regression ...........................	MSe =
• Quartic Regression ........................	MSe =
• Logarithmic Regression..................	MSe =
• Exponential Regression (a·ebx) .......	MSe =
(a·bx)........	MSe =

1	n
	Σ (yi – (axi + b))2
n – 2
	i=1
1	n
	Σ (yi – (a + bxi))2
n – 2
	i=1
1	n
	Σ (yi – (axi 2 + bxi + c))2
n – 3
	i=1
1	n
	Σi=1	(yi – (axi3+ bxi2+ cxi + d ))2
n – 4
1	n
	Σ (yi – (axi4+ bxi3 + cxi2 + dxi + e))2
n – 5
	i=1
1	n
	Σ (yi – (a + b lnxi ))2
n – 2
	i=1

1Σn (lnyi – (lna + bxi ))2 n – 2 i=1

1 Σn (ln yi – (ln a + (ln b) · xi ))2 n – 2 i=1

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