Dear Ylva
Metrical studies have demonstrated that measurements taken along the same axis, i.e. lengths, widths and depths, are highly correlated. Consequently, by using the log ratio method it is possible to combine these measurements, thus increasing metrical sample sizes. The log ratio technique involves converting all measurements to logarithms. A single specimen, or group of specimens, is chosen as a standard for comparison. The log ratio is then calculated by subtracting the log (base 10) of each measurement from the log (base 10) of the standard.
A log ratio of zero implies the measurement is the same size as the standard, a positive value implies that it is larger and a negative value that it is smaller. Measurements from bones and teeth should not be combined because teeth are less affected by environmental conditions, sex and age. It is possible to combine all postcranial bone measurements on the same axis, but this does to lead to a loss of resolution.
I hope this helps - let me know if you want me to send you an example.
Richard
-----Original Message-----
From: Analysis of animal remains from archaeological sites [mailto:[log in to unmask]] On Behalf Of Ylva Telldahl
Sent: 23 April 2008 09:14
To: [log in to unmask]
Subject: [ZOOARCH] Calculating logarithmic size indices (LSI)
Dear all,
Does anyone use LSI after Meadow?s for calculating cattle size? How well does it work?
Many thanks,
Ylva
____________________________________________
Osteoarchaeological Research Laboratory
Department of Archaeology and Classical Studies Lilla Frescativagen 7 Stockholm University
106 91 Stockholm, Sweden
phone: + 46 8 16 46 19
mobile: 46 70 237 53 07
fax: + 46 8 16 44 76
http://www.archaeology.su.se/pub/jsp/polopoly.jsp?d=1878&a=7261
-----Ursprungligt meddelande-----
Fran: Analysis of animal remains from archaeological sites [mailto:[log in to unmask]]For Thomas, Dr R.M.
Skickat: den 11 april 2008 18:01
Till: [log in to unmask]
Amne: [ZOOARCH] Pig isotopic data
Dear all,
I have recently been sent some Carbon and Nitrogen isotopic data for a Neolithic pig subsequent to radiocarbon dating, and I am looking for comparative data to assess its significance. Can anyone point me in the right direction?
Many thanks
Richard
Dr. Richard Thomas,
Lecturer in Zooarchaeology,
School of Archaeology and Ancient History, University of Leicester, University Road, Leicester,
LE1 7RH.
0116 252 3343
http://www.le.ac.uk/ar/rmt12
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