# St. John's wort: HPLC-PDA

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## Introduction

HPLC-PDA profiles of 24 commercial preparations of St. John's wort originating from several continents. Three or four replicates (denoted with letters from A to D) of each sample (89 observations).

Origin specified in "country" and id specified in "class".
Retention times from 12 to 23.7 min in steps of 1.32 s (549 variables)
UV spectra in steps of 3 nm from 260 – 550 nm (97 variables).

The data are available in zipped MATLAB 7 format and stored as dataset objects (see freeware dataset object at www.eigenvector.com). If you use the data we would appreciate that you report the results to us as a courtesy of the work involved in producing and preparing the data. Also you may want to refer to the data by referring to

E. Acar, R. Bro, and B. Schmidt. New exploratory clustering tool. J.Chemom. 22:91-100, 2008.

## Get the Data (Matlab)