----- Forwarded message from "Kolatorowicz, Adam"
<kolatorowic...@buckeyemail.osu.edu> -----
Date: Thu, 28 Nov
2013 07:53:13 -0500
From: "Kolatorowicz, Adam"
<kolatorowic...@buckeyemail.osu.edu>
Reply-To: "Kolatorowicz,
Adam" <kolatorowic...@buckeyemail.osu.edu>
Subject: RE: sampling
size
To: "morphmet@morphometrics.org"
<morphmet@morphometrics.org>
Patrick,
For
three-dimensional landmarks you should have at least three times as many
specimens as there are landmarks and for two-dimensional landmarks
you should have at least two times as many specimens as there are landmarks.
In your case this would be either 180 or 120 specimens. Depending on what your
questions is and what statistical tests you'll be using, you may need an even
larger sample size.
Best,
Adam
Adam Kolatorowicz
PhD Candidate
Department of Anthropology | The Ohio State University
4034 Smith Laboratory | 174 West 18th Avenue | Columbus, OH 43210
________________________________________
From: morphmet_modera...@morphometrics.org [morphmet_modera...@morphometrics.org]
Sent: Thursday, November 28, 2013 4:59 AM
To: morphmet@morphometrics.org
Subject: sampling size
----- Forwarded message from Patrick Arnold <patrick.arn...@uni-jena.de> -----
Date: Tue, 26 Nov 2013 15:53:26 -0500
From: Patrick Arnold <patrick.arn...@uni-jena.de>
Reply-To: Patrick Arnold <patrick.arn...@uni-jena.de>
Subject: sampling size
To: morphmet@morphometrics.org
Dear all,
I have a very basic question: how many landmarks are suitable for
certain sample size. I want to examine 60 landmarks of vertebrae. I
think my sample is too small. Thus, will I need at least 60 vertebrae
or at least 120, or ....? I do not find a rule or formula for
calculating sampling size.
Thanks in advance.
Patrick Arnold
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----- End forwarded message -----
Adam Kolatorowicz
PhD Candidate
Department of Anthropology | The Ohio State University
4034 Smith Laboratory | 174 West 18th Avenue | Columbus, OH 43210
________________________________________
From: morphmet_modera...@morphometrics.org [morphmet_modera...@morphometrics.org]
Sent: Thursday, November 28, 2013 4:59 AM
To: morphmet@morphometrics.org
Subject: sampling size
----- Forwarded message from Patrick Arnold <patrick.arn...@uni-jena.de> -----
Date: Tue, 26 Nov 2013 15:53:26 -0500
From: Patrick Arnold <patrick.arn...@uni-jena.de>
Reply-To: Patrick Arnold <patrick.arn...@uni-jena.de>
Subject: sampling size
To: morphmet@morphometrics.org
Dear all,
I have a very basic question: how many landmarks are suitable for
certain sample size. I want to examine 60 landmarks of vertebrae. I
think my sample is too small. Thus, will I need at least 60 vertebrae
or at least 120, or ....? I do not find a rule or formula for
calculating sampling size.
Thanks in advance.
Patrick Arnold
----------------------------------------------------------------
This message was sent through https://webmail.uni-jena.de
----- End forwarded message -----
----- End forwarded message
-----
