Normalization. Use the normalization method drop down list to determine how the strength of the links between items is normalized. Normalized link strengths are used as input for the vos layout technique and the vos clustering technique. The following options are available in the normalization method drop down list:
No normalization. If this option is selected, no normalization is performed We generally do not recommend this option
Association strength. If this option is selected, the association strength method is used for normalizing the strength of the links between items. Apart from a multiplicative constant, this method is identical to Eq.(6) in Van Eck and Waltman(2009). This option is selected by default.
Fractionalization. If this option is selected, the fractionalization method is used for normalizing the strength of the links between items. Apart from a multiplicative constant, this method is identical to Eq.(13)in Van Eck and Waltman(2009).
LinLog/modularity. If this option is selected, normalization is performed in the same way as in the LinLog layout technique and the modularity clustering technique. For more information about these techniques, we refer to Newman(2004)and Noack(2007, 2009).