Question 8: How could we check the assumption of linearity?
We can check the assumption of linearity by adding a height squared term:
Head (mm) = 94.7 + 0.449×height (mm)
- 0.000104×height squared (mm2)
95% CI -621.9 to 811.4 -0.389 to 1.287 -0.000349 to 0.000142 -0.70 to 15.12
P=0.8 P=0.3 P=0.4
In tabular form, the coefficients are:
|intercept||94.7||0.8||-621.9 to 811.4|
|height||0.449||0.3||-0.389 to 1.287|
|height squared||-0.000104||0.4||-0.000349 to 0.000142|
|sex||7.23||0.07||-0.70 to 15.12|
Continue with Exercise: Head circumference, sex, and height.
To Clinical Biostatistics index.
To Martin Bland's M.Sc. index.
To Martin Bland's home page.
This page maintained by Martin Bland.
Last updated: 20 March, 2006.
Back to top.