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FINDINGS AND DISCUSSION
This section presents the results of the analysis. There were 14442 words analyzed using The Compleat Lexical Tutor, v.4. The vocabulary profile is
presented in form of a table. The first part of this section presents the overall vocabulary profile of the textbook showing the proportions of the vocabulary
frequency classifications. The second part shows the negative vocabulary profiles of K-1, K-2, K-3 AWL with lists of the vocabulary items that were not found in
the three textbooks. The last part of this section shows the comparison of vocabulary profile across some chapters of the textbook.
1. The Overall of Vocabulary Profile
Table 1 shows the first row in Table 1 shows three terms; family, type and token. Word family is head word, for example: the family or head word of
development and developing is develop. Type is different words, for example: important and interesting are different words. While development and developed,
or developing are considered as the same type. Token is words in a text; the total number of words in a text. For example, if in a text there are confirm [2], develop
[3], since [5], and think [7], the number of token is 17. Table 1 shows that the majority 84.65 of the vocabulary fell under the
most frequently used 1000 words group K-1. With the additional K-2 word coverage 6.55 with the cumulative percentage of the word coverage was
91.20, which indicate that it is close estimate for good comprehension of the texts in the books. By the cumulative percentage of K-1 and K-2 words, the
13 textbook could be assumed that the textbook is understandable for Vocational
High School students because the percentage of K-1 and K-2 words in the textbook are around 95 as the requirement of good understanding of the
textbook.
Table 1. The Overall Vocabulary Profile of The Textbook
FAMILIES TYPES
TOKENS CUMULATIVE
K-1 WORDS
688 60.78
1172 54.03
12225 84.65
84.65
K-2 WORDS
284 25.09
375 17.29
946 6.55
91.20
AWL 570 fams
tot: 2.570
160 14.13
200 9.22
422 2.92
94.12
OFF-LIST ??
421 19.41
849 5.88
100
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TOTAL 1132+?
2169 100
14442 100
In learning vocabulary, the most important thing is the comprehension of the words, sentences and paragraph. According to Hirsch 2003, in learning
vocabulary in another language stated that an understanding of 90-95 of the words is necessary for comprehension. On the other hand, 2.92 of vocabulary
fell under the academic words AWL. Academic words are words that are commonly used in academic texts. Teacher need to select whether the academic
words that amounted to 422 words used in the textbook need to be introduced to the students in Vocational High Schools. There were 849 words fell under off-list.
Off list words are those words that did not include into other categories. This off- list word should not be ignored in teaching, because students at this level need to
know about the vocabulary. Then, teachers have to be wise in selecting for useful words in this category. The rest percentage of AWL and off-list words were
5.88, it means that students need efforts to get better comprehension.
2. Negative vocabulary profiles of the textbook
