Loading of principal components 1 and 2. Loading of the first two principal components for DPOAE spectra are plotted as a function of the f2 stimulus frequency. The first component (PC1) has all positive loadings, indicating that it is a measure of the overall magnitude of emissions. The second component (PC2) has positive loading for low frequencies and negative loading for high frequency, indicating that it is a measure of the contrast between the magnitude of high frequency emissions and low frequency emissions.
Keller and Noben-Trauth BMC Genetics 2012 13:32 doi:10.1186/1471-2156-13-32