Info

"F-value = univariate F-value for that peak; [/-statistic is a measure of the error, ie, the degree to which the classification is approaching 100% correctness, values rounded off to fourth decimal; multivariate F-value = F-value for values as combined.

"F-value = univariate F-value for that peak; [/-statistic is a measure of the error, ie, the degree to which the classification is approaching 100% correctness, values rounded off to fourth decimal; multivariate F-value = F-value for values as combined.

distinguishing the same kind of an herb grown in five different geographical countries of the world. At intervals, the chemical means need to be revalidated by matching the instrumental output with sensory judgments in case growers have made some change in their growing practices or in the way the product is stored or shipped following harvesting, or for other reasons. However, if the equation is established with sufficient replication of measurements and samples to start with, it is usually quite robust.

The opposite approach has also been used (22). Chemical analysis has been used in an attempt to standardize more closely batches of distillers' spirits. It was decided that sensory evaluation coupled with LDA was a more suitable way to maintain a high level of quality control. The procedure is a more direct means of ascertaining sensory quality than going through chemical analysis, which in turn must be correlated with sensory quality. It is less suitable for high-speed lines or for plants that rim 16 or 24 h/day. A disadvantage to using sensory panelists is that if a panelist leaves the panel, the SDA process and development of a LDA equation should be recalculated to be sure the replacement panelist has not caused a change in the weighting values. Recalculation, however, is not a time-consuming operation. In fact, if the original panelists were selected carefully to be sure they were in good agreement in their responses and if records of performance have been kept (as they should be), replacing a panelist is no more a touchy subject than it is for replacement of any panelist. A comparison of the new panelist's performance with the prior history of the panel should tell the sensory analyst whether the panel mean is likely to be influenced.

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