Hi Liu,
I'm not sure I understand your question.
Those are the percentages of the total sum of squares due to each of
those terms and, yes, as you can see from the numbers, they all add up
to 100%.
Of course, you can quantify only what you measure, and you cannot
exclude that there are other sources of error than the ones you tested
(I say this because of your wording "total error").
I hope this helps,
Best,
Carmelo
Liu Idárraga <[email protected]> ha scritto:
And respect to the total error, the sum of the % SSimage + % SSdig?
Liu
2016-03-15 21:38 GMT-03:00 Carmelo Fruciano <[email protected]>:
Liu Idárraga <[email protected]> ha scritto:
Appreciated colleagues.
I have some doubts about the correct calculation of error in my data. I
had
understood that the error corresponde to the proportion that represent the
SS of each effect (image / digitalization) in the SStotal; but I found in
the classical paper of Bayley & Byrnes 1990. Syst. Zool. 39(2):126 that
the
way to calculate the percent of the measurement error is:
% ME = 100% s2 within / (s2 within - s2 among)
s2 within = MS within
but
s2 among = (MS among -MS within)/# replicates
I have the followed results for 71 ind in 2D, and 44 coord (66 - 4 -
18 semi landmarks)
Procrustes ANOVA para la forma: con g.l. corregidos
Efecto SS SS (%) MS df F p (param.)
Individuo 0,26857296 92,84 8,59709E-05 3124 25,97 <.0001
Imagen 0,01048868 3,63 3,31082E-06 3168 2,05 <.0001
Digitalización 0,01021206 3,53 1,61175E-06 6336
Total 0,28927370 100,00
My questions are:
1) Is correct to say that 3,63 and 3,53 are the errors of image and
digitalization?
2) Is the total error equal to 3,63 + 3,53 or I should calculate it with
the equations of Bayley & Byrnes 1990?
In advance, thanks a lot for the help.
Liu
Dear Liu,
Perhaps the best way to report this would be to say that 3.63% of the
total sum of squares is accounted for by/due to a certain term
(digitization, preparation)?
Best,
Carmelo
--
Carmelo Fruciano
Postdoctoral Fellow - Queensland University of Technology - Brisbane,
Australia
Honorary Fellow - University of Catania - Catania, Italy
e-mail [email protected]
http://www.fruciano.it/research/
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*Liu Idárraga*
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Facultad de Ciencias Naturales y Museo
Universidad de La Plata - Argentina
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Carmelo Fruciano
Postdoctoral Fellow - Queensland University of Technology - Brisbane,
Australia
Honorary Fellow - University of Catania - Catania, Italy
e-mail [email protected]
http://www.fruciano.it/research/
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