The analysis of variance with internode diameter as
the dependent variable indicated significance at the .01
probability level both with all independent variables
included and with only the independent variables for insects
included. The partial sums of squares with all variables
included showed significance at .01 for water depth and
Agasicles. The partial sums of squares with only the insect
variables included resulted in Aqasicles not being statis-
tically significant and Vogtia significant at the .01
probability level (Table 16). The reversal in significance
for Agasicles is probably due to the correlation of Vogtia
with stem diameter (the simple correlation coefficient
was .51).
Table 16. ANOV for internode diameter
Source DF SS MS F Prob F
Regression 12 44.42 3.70 19.95 0.0001
Error 274 50.84 0.18
Corrected Total 286 95.26
Source DF Partial SS F Prob F
pH 1 0.001 0.00 0.95
Alkalinity 1 0.144 0.77 0.62
Iron 1 0.040 0.21 0.65
Turbidity 1 0.001 0.00 0.95
Chlorides 1 0.033 0.18 0.68