In the tpsRelw software the semilandmark at the end of the curve cannot be slid so it will be treated as if it were a landmark. The validity of this is more of a biological question than a statistical one. If the position of that point is a function of the position of a "mobile feature" then this will introduce variation in the data that is a function of the position of the mobile feature - not shape.
----------------------- F. James Rohlf, Distinguished Professor & Graduate Program Director State University of New York, Stony Brook, NY 11794-5245 www: http://life.bio.sunysb.edu/ee/rohlf > -----Original Message----- > From: morphmet [mailto:[EMAIL PROTECTED] > Sent: Thursday, June 16, 2005 7:08 AM > To: morphmet > Subject: Mixed semilandmarks > > Hi All, > > I have a set of specimens with a curve which has one end > obscured by a mobile feature, so that end cannot be used as a > landmark. > > I have set semilandmarks along this curve using a comb > between one landmark on the curve and another off of the curve. > > Clearly I can't use the off-curve landmark as the endpoint of > the curve, so I am using the last semilandmark instead. > > My question: Is it valid to fix the terminal semilandmark, > and define the rest as sliders, or must they all be fixed? > > Many thanks, Shaun > > [EMAIL PROTECTED] > > > ______________________________________________________________ > __________ > Yahoo! Messenger NEW - crystal clear PC to PC calling > worldwide with voicemail > -- > 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
