Baseline

Baseline

The baseline method uses an asymmetric least squares approach for baseline correction. The baseline method takes chromatograms from your chromatography data and returns a global baseline for each signal.

Contents

1. Syntax
2. Input
3. Options
4. Examples
5. References

Syntax

data = obj.baseline(data, 'OptionName', optionvalue)

Input

Name	Value	Description
data	structure	Structure containing chromatography data

Options

Name	Value	Description
'samples'	'all'	Select all samples in data
	index	Row index of samples in data
'ions'	'all'	Select all ion chromatograms in samples
	'tic'	Select all total ion chromatograms in samples
	index	Column index of ion chromatograms in samples
'smoothness'	value	Set the smoothness parameter to specified value
'asymmetry'	value	Set the asymmetry parameter to specified value

Examples

Manually set the parameters used for baseline calculation using the smoothness and asymmetry options. Suggested ranges for these parameters are given below.

Parameter	Lower	Upper	Default
'smoothness'	103	109	106
'asymmetry'	10-6	10-1	10-4

Parameter		'smoothness'
		106
'asymmetry'	10-1
	10-3
	10-6

References

• P.H.C. Eilers, Analytical Chemistry, 75 (2003) 3631