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Table 2 Results of two-way ANOVA for association between relevant factors and landmark coordinate variation

From: Surface landmark quantification of embryonic mouse craniofacial morphogenesis

 

E10.5

E11.5

E12.5

DF

Sum Sq

p-value

DF

Sum Sq

p-value

DF

Sum Sq

p-value

Specimen

9

0.0406

4.6E-08

8

0.0179

0.019

9

0.0340

0.1097

Landmark

3

0.0282

6.9E-08

3

0.0874

<2.2E-16

3

0.5048

<2.2E-16

Observer

35

0.5857

<2.2E-16

35

0.8070

<2.2E-16

35

3.1895

<2.2E-16

Residual

1392

1.0711

 

1249

1.2124

 

1392

3.2834

 
  1. Two-way ANOVA results for the association between Specimen, Landmark, and Observer factors and variation in identified landmark coordinates for the three embryonic ages. Results include degrees of freedom (DF), sum of squares (Sum Sq), and p-value, which is highlighted in bold if highly significant (<.001). Variation in landmark coordinates were calculated as Euclidian distances between a given landmark location and the mean location across observers for the same specimen.