  Home Contact Sitemap                # Which output variables are available from the curve fits?

Document ID: DQ236
Relevant to following products: WorkOut 2.0 Manta
Document description: Which output variables are available from the curve fits? Curve fit transforms result in Output Variables; these hold further information about the fit.

The following output variables are produced by all fit methods to quantify the goodness of the fit:

 Output Variables Description MSE Mean Square Error R2 R2 - this is 1 minus the ratio of SS / (the sum of the squares of the differences between Y fit and the mean Y value). This will equal 1 for a good fit (SS = 0) and tend towards 0 for a bad fit. SS The sum of the squares of the residuals (errors) SYX The standard deviation of the residuals. This is the square root of (the sum of the squares of the residuals divided by (number of data points – number of coefficients)).  This will not be calculated if the number of data points is equal to the number of coefficients.

Output Variables specific to the fit are also available as follows:

 Fit Method Output Variables Details Linear Regression m The slope c The intercept Polynomial Fit a, b, c, d, e, f, g, h, i, j Letters a-j depending on the specified order representing the determined coefficients Four Parameter Fit a, b, c, d The determined four parameter coefficients.  c is the centre point. Five Parameter Fit a, b, c, d, m The determined five parameter coefficients.  c is the centre point and m is a measure of symmetry about c Cubic Spline There are no output variables produced for the cubic spline. Michaelis-Menten Vmax The determined maximum value of y. Km The determined Michaelis-Menten coefficient. Exponential Y0 Y intercept V0 Initial down-slope K Decay-rate constant Related articles:
DQ234: How To: Access the Standard Curve Fit parameters.
How To: Access the Standard Curve Fit parameters. DQ235: How To: Access the Kinetic Fit parameters
How To: Access the Kinetic Fit parameters DQ073: What is R²?
What is R²? DQ074: What is SS?
What is SS?  Search again  Download software now: WorkOut 2.5 Manta Stingray  Search Knowledge Base Browse Knowledge Base Submit a query

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