Re: [MORPHMET] Centroid size correlation with size

2018-11-18 Thread Murat Maga
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Couple things. If your landmarks are on structures that doesn't change in s=
ize much during ontogeny, regardless of what happens in the rest of the sku=
ll, the centroid size cannot change either.

But more likely, you have a technical problem with for scaling.

I would suggest taking a simple length (eg., Skull length) in all your samp=
les and then see if those measurements makes make sense and show the variab=
ility that you expected to see in the size.
Hth,
M



Get Outlook for Android<https://aka.ms/ghei36>


From: Agnese Lanzetti 
Sent: Sunday, November 18, 2018 5:29:56 PM
To: MORPHMET
Subject: [MORPHMET] Centroid size correlation with size

Hi all,

I am encountering a strange pattern in my data and I'm not sure if it is a =
problem with how i am collecting the landmarks or it's actually just a stra=
nge but correct pattern.

I work with an ontogenetic series of baleen whale skulls. The skulls of the=
 fetal specimens are very small (10-30 cm in length) compared to newborns o=
r adults (80-120 cm length). I would expect from my understanding of centro=
id size to increase progressively going from the early fetuses to the adult=
s, but this is not the case. The fetal stages seems to overall follow the p=
attern from small to big, but newborns and adults have more variable centro=
id sizes that overlap with the range of the fetuses.

I collect my landmarks in Avizo, and I changed the scale of the 3D models I=
 imported from other software to scale the skulls to their real size.

Do you think there is a problem with the landmark collection or it could be=
 possible that centroid size does not approximate actual skull size in this=
 case?

Thanks a lot!
Agnese
agnese.lanze...@hotmail.it




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Couple things. If your landmarks are on structures that doesn't change in s=
ize much during ontogeny, regardless of what happens in the rest of the sku=
ll, the centroid size cannot change either.




But more likely, you have a technical problem with for scaling.



I would suggest taking a simple length (eg., Skull length) in all your samp=
les and then see if those measurements makes make sense and show the variab=
ility that you expected to see in the size.


Hth,


M






Get https://aka.ms/ghei36;>Outlook for Android



From: Agnese Lanzetti a=
gnese.lanze...@hotmail.it
Sent: Sunday, November 18, 2018 5:29:56 PM
To: MORPHMET
Subject: [MORPHMET] Centroid size correlation with size



Hi all,


I am encountering a strange pattern in my data and I'm not sure if it =
is a problem with how i am collecting the landmarks or it's actually just a=
 strange but correct pattern.


I work with an ontogenetic series of baleen whale skulls. The skulls o=
f the fetal specimens are very small (10-30 cm in length) compared to newbo=
rns or adults (80-120 cm length). I would expect from my understanding of c=
entroid size to increase progressively
 going from the early fetuses to the adults, but this is not the case. The =
fetal stages seems to overall follow the pattern from small to big, but new=
borns and adults have more variable centroid sizes that overlap with the ra=
nge of the fetuses.


I collect my landmarks in Avizo, and I changed the scale of the 3D mod=
els I imported from other software to scale the skulls to their real size.&=
nbsp;


Do you think there is a problem with the landmark collection or it cou=
ld be possible that centroid size does not approximate actual skull size in=
 this case?


Thanks a lot!
Agnese
agne=
se.lanze...@hotmail.it












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MORPHMET may be accessed via its webpage at http://w

[MORPHMET] Centroid size correlation with size

2018-11-18 Thread Agnese Lanzetti
Hi all,

I am encountering a strange pattern in my data and I'm not sure if it is a 
problem with how i am collecting the landmarks or it's actually just a 
strange but correct pattern.

I work with an ontogenetic series of baleen whale skulls. The skulls of the 
fetal specimens are very small (10-30 cm in length) compared to newborns or 
adults (80-120 cm length). I would expect from my understanding of centroid 
size to increase progressively going from the early fetuses to the adults, 
but this is not the case. The fetal stages seems to overall follow the 
pattern from small to big, but newborns and adults have more variable 
centroid sizes that overlap with the range of the fetuses.

I collect my landmarks in Avizo, and I changed the scale of the 3D models I 
imported from other software to scale the skulls to their real size. 

Do you think there is a problem with the landmark collection or it could be 
possible that centroid size does not approximate actual skull size in this 
case?

Thanks a lot!
Agnese
agnese.lanze...@hotmail.it



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MORPHMET may be accessed via its webpage at http://www.morphometrics.org
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