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Of course, these design styles are not eligible for chronological seriation.
Hill and Gauch (1980) presented a method to remove this effect.
In 2003, Groenen and Poblome adapted the correspondence analysis algorithm to combine seriation with absolute dates and stratigraphic relationships.
Contextual seriation is often used for reconstructing the chronological sequence of graves as only the presence or absence of a design style or type is important.
Frequency seriation is applied in case of large quantities of objects belonging to the same style.
Therefore, it is recommended inspecting the scatterplot of the first two axes of correspondence analysis to find out if other factors play a role as well (see Examples 2 and 3).
If more than one factor is important, the arch effect may distort the results.
Errors in typology result in errors in seriation: For example, if a certain design style had two peaks in popularity (bimodal distribution), this design style is not appropriate for seriation and its inclusion in the analysis may result in strange results.
Some design styles were used for a very long time as the shape constructed was handy and no improvement or ornament was added.
In 1971, Kendall proposed the use of multidimensional scaling techniques for seriation problems, and this approach has also been used by some other scientists (see Baxter 2003, pp. Baxter also presents a review of statistical methods for seriation and a description of these approaches (pp. Today, the most popular seriation method both for contextual and frequency problems is based on correspondence analysis. Using this technique, not only the sequence of the objects but also those of the design styles is established.
The sequence of the first axis of a correspondence analysis is considered the best seriation order (Shennan 1997, p. Note that external evidence is needed to establish the direction of the sequence calculated, i.e.