He found that the graves he was uncovering contained no evidence of their dates and their discrete nature meant that a sequence could not be constructed through their stratigraphy. The assumption that design styles follow a bell curve of popularity – starting slowly, growing to a peak and then dying away as another style becomes popular – provides the basis for frequency seriation.
Petrie listed the contents of each grave on a strip of cardboard and swapped the papers around until he arrived at a sequence he was satisfied with. It also assumes that design popularity will be broadly similar from site to site within the same culture.
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.
In Europe, it has been used frequently to reconstruct the chronological sequence of graves in a cemetery (e.g.
Following these rules, an assemblage of objects can be placed into sequence so that sites with the most similar proportions of certain styles are always together (Lock 2003, p. Creating a typology frequently is the basis of a seriation.
Rumors are circulating the Internet that she has finally called it quits with Corey Gamble, 36, and has been seeing a new man, Christopher Cunningham, on the ‘down-low’.
Interestingly, the 61-year-old Kardashian matriarch is also reportedly about to sell up in Calabasas and move to Manhattan Beach according to reports.
The resulting scatterplot showed the form of a horse-shoe where the graves were arranged on the curve according to their chronological order.
Similarly, a mapping of the component scores for the first two axes of the correspondence analysis result will display a parabola if the design styles considered are controlled by one factor only (like chronology).