Spectral Representation" class=dd-item><a href=../basic-usage/spectral-representation/>Spectral Representation</a></li><li data-nav-id=/basic-usage/multivariate/ title="Multivariate analysis" class=dd-item><a href=../basic-usage/multivariate/>Multivariate analysis</a><ul><li data-nav-id=/basic-usage/multivariate/pca/ title="Principal Component Analysis (PCA)" class=dd-item><a href=../basic-usage/multivariate/pca/>Principal Component Analysis (PCA)</a></li></ul></li></ul></li><li data-nav-id=/advanced-use/ t