Chapter 1 the study of collocations

Table 17.  Post-hoc comparisons for the dependent variable: Words per T-
Unit 
Comparison 
Mean Diff. 
Fisher PLSD  Scheffe F-test  Dunnett t 
Group 1 vs. Group 2  -9.734 
4.619* 
8.609* 
4.15 
Group 1 vs. Group 3  -39.622 
4.669* 
139.603* 
16.709 
Group 2 vs. Group 3  -29.889 
4.632* 
80.719* 
12.706 
* Significant at .05 level 
 
240

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Table 18.  Means and standard deviations for the dependent variable: Words 
per T-Unit 
GROUP COUNT MEAN STD. 
DEV. 
Group 1 
91 
   6.801 
1.070 
Group 2 
94 
   7.774 
1.339 
Group 3 
90 
10.763 
2.177 
 
4.1.7  Error-Free T-Units 
 
The ANOVA for the dependent variable Error-Free T-Units shows a 
significant main effect for the factor Group, (F(2, 272) = 9.031, p = .0002).  To 
examine the source of the significant effect for the factor Group, post-hoc 
comparisons of the means for each group were performed.  The results of the 
comparisons are illustrated in Table 19.  There is a significant difference 
between Group 3 and Group 1, and between Group 3 and Group 2, at the p < 
.05 level of significance.  The highest proficiency group had the smallest 
number of Error-Free T-Units, see Table 20.