Figure 8
![Figure 8](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1471-2105-9-400/MediaObjects/12859_2008_Article_2385_Fig8_HTML.jpg)
Mean absolute error of investigated Classifiers, the standard error (SE) is given in brackets. Classifiers trained with selected features are annotated with an additional #. Bagged Classifiers are annotated with an additional * and boosted classifiers carry an additional +- symbol. MAE/SE calculated with two decimal place for δ exp and one decimal place for δ pred in terms of classification.