Baseline

#Baseline

The baseline method uses an asymmetric least squares approach for baseline correction. The baseline method accepts 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'	Selects all samples in data
	index	Row index of samples in data
'ions'	'all'	Selects all ion chromatograms in samples
	'tic'	Selects all total ion chromatograms in samples
	index	Column index of ion chromatograms in samples
'smoothness'	value	Sets the smoothness parameter to desired value
'asymmetry'	value	Sets the asymmetry parameter to desired 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	10-3

Parameter		'smoothness'
		103	106	109
'asymmetry'	10-1
	10-3
	10-6

##References

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