CALC 1 Curve Fitting: Exponential Example

y = b * exp(m * x)

Calculate the correlation, m factor, b factor and estimates for the following data:

X	Y
2	33
3	42
4	54
5	64
6	77

Data Entry

Value	Key	Display	Description
	shift C lists	0	Clears the x and y lists.
33	= (CHN, ALG) or ENTER (RPN)	33.0000	Enters y value.
2	Σ+	1.0000	Append x and y to lists x and y.
42	= or ENTER	42.0000	Enters y value.
3	Σ+	2.0000	Append x and y to lists x and y.
Repeat for the remaining data.

Data can be verified and corrected using the List Manager.

Calculations

	shift Σx,y	270.00 y 20.00 x	Calculates the sum of lists x, y.
	crrl	0.9965	Calculates the correlation coefficient between lists x, y.
	m fct	0.2116	Calculates the m factor.
	b fct	22.17	Calculates the b factor.
6	y est	78.91	Calculates the estimate of y.
3	y est	41.83	Calculates the estimate of y.
50	x est	3.843	Calculates the estimate of x.