Chapter 1 the study of collocations

Table 15.  Post-hoc comparisons for the dependent variable: Lexical Density 
Comparison 
Mean Diff. 
Fisher PLSD  Scheffe F-test  Dunnett t 
Group 1 vs. Group 2  27.091 
13.845* 
7.422* 
3.853 
Group 1 vs. Group 3  48.765 
13.995* 
23.533* 
6.86 
Group 2 vs. Group 3  21.674 
13.884* 
4.724* 
3.074 
* Significant at .05 level 
 
 
239

---

Table 16.  Means and standard deviations for the dependent variable: Lexical 
Density 
GROUP COUNT MEAN STD. 
DEV. 
Group 1 
91 
42.017 
5.240 
Group 2 
94 
39.308 
5.030 
Group 3 
90 
37.141 
3.956 
 
4.1.6  Length of T-Units 
 
The ANOVA for the dependent variable Words per T-Unit shows a 
significant main effect for the factor Group, (F (2, 272) = 151.684, p = .0001).  To 
examine the source of the significant main effect, post-hoc comparisons of the 
means for each group were performed.  The results of the comparisons are 
illustrated in Table 17.  There is a significant difference between all groups at 
the p < .05 level of significance.  The table of means, Table 18, shows a steady 
increase of the length of the T-Units from Group 1 to Group 3.