Polynomial regression in Origin performs fit to data using the following model:
y = β0 + β1x + β2x2 + .. + βnxn
where βn are the coefficients.
Polynomial regression can fit data with polynomial up to 9th order and it also supports fitting with fixed intercept or slope and apparent fit.
Origin's polynomial regression dialog box can be opened from an active worksheet or graph. From the menu:
Controls recalculation of fitting results upon changes to source data
For more information, see: Recalculating Analysis Results
This control is available only when there is more than one input dataset.
Specify the input XY data range
For more information, see: Specifying Your Input Data
Specifies the order (1 through 9) of polynomial curve.
Use error bars as value for weights. Only available when a designated error column (yEr±) is selected.
For more information, see: Weighted Fitting.