-------- Original Message -------- Subject: Re: SAMPLE SIZE CALCULATION Date: Mon, 1 Jun 2009 10:09:40 -0700 (PDT) From: Alexander Bjarnason <[email protected]> To: [email protected] References: <[email protected]> Ali Before one can begin to answer this question I think it is important to consider what biological question you are asking, why you are using a geometric morphometric approach, what groups you are hoping to study and what is actually out there (if you sampling specimens from collections rather than specimens at your own disposal). At what level are you going to be investigating your research question- sex, population, subspecies, species, genera? If your question includes the hominid fossil record your sampling is bound to much smaller than for extant hominoids. If you are looking at living primates you will want greater sample sizes if you are comparing subspecies than if you are comparing genera. You also need to think about whether for your particular question you will need more specimens than landmarks used. Personally, my major worry is often related to logistics- unless you have massive funds at your disposal and equally large amounts of time for data collection, you need to carefully consider the tradeoff between what you want to do and what you need to do in order to address the questions you are interested in. I wish I could give a more straight forward answer but I don't have one, perhaps someone else can..... -Alex (Bjarnason)
-------- Original Message -------- Subject: SAMPLE SIZE CALCULATION Date: Fri, 29 May 2009 05:23:54 -0700 (PDT) From: ali mahmood <[email protected]> To: [email protected] Dear ALL I need to calculate my sample size before starting new geometric morphometric study, any one can tell me the steps that I need to follow to do this ? . with my regards. yours Ali -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
-- Replies will be sent to the list. For more information visit http://www.morphometrics.org
