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. Author manuscript; available in PMC: 2009 Aug 17.
Published in final edited form as: Mol Ecol. 2008 Mar;17(6):1614–1626. doi: 10.1111/j.1365-294X.2008.03690.x

Table 7.

Results of a sas proc glm linear regression of latitude and temperature on leaf Hsp101 content. Regression on temperature included both linear (temperature) and quadratic (temperature × temperature) terms, while the effect of latitude was strictly linear. Higher order interactions were tested and removed from the model, as they were nonsignificant. d.f. = degrees of freedom, r2 = percent variance explained

Source d.f. Sum of squares type III F P > F r2
Model 3 44.75 73.53 < 0.0001 0.86
Latitude 1 2.35 11.58 0.002
Temperature 1 0.87 4.3 0.045
Temp * temp 1 2.21 10.9 0.002
Error 36 7.29
Total 39 52.05