广州中考英语词频信息对全国中考语的预测效力:一项微型研究
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广州中考英语词频信息对全国中考语的预测效力:一项微型研究
2. 单词的覆盖范围（range，即在多少套考试中出现），例如the的range为100，表示在100套题目中都有出现3. 频率（word frequency）。例如the的频率为15448。另有200套全国各地中考题，经统计得到单词列表及对应的范围分布及频率。问：广州语料库的词频，能在多大程度上预测全国语料库中的词频？挑选在全国语料库中词频≥5%的单词，共1522个。为了剔除高频词（如the、in、we、two）的影响，剔除掉词频全国语料库中词频≥95%的单词94个， 剩余1428个，进入统计。在全范围单词（1428个单词）中，两组数据的覆盖范围相关性为0.95，频率相关性也为0.95，高度相关。即广州中考的词频信息，能很好预测全国中考的词频。经计算两者覆盖范围之差（全国减去广州）可发现，两者范围相近（±5%）以内的单词共有794个，占全范围单词的55.6%，即广州单词中，超过一半的覆盖范围和全国的相近。结果显示，两者覆盖范围差在5%以上的共有239个，平均差异为10.6%。其中差异最大的为club，在全国中考出现概率为51%，而在广州仅为18%，相差33%。其它差异较大的词有： | | | | |
club | club (288); clubs (32) | 51% | 18% | |
| museum (164); museums (20) | | | |
| weather (199); weathers (4); weathered (1) | | | |
| | | | |
| | | | |
| bank (77); banks (3); banking (2) | | | |
| tourists (60); tour (59); tourist (19); tours (14); tourism (17); touring (2) | | | |
| | | | |
| bike (150); bikes (14); biking (17); bikers (1); biked (1) | | | |
| train (144); trainer (10); trained (36); training (101); trains (16); trainers (4); untrained (1); trainings (1) | | | |
| library (176); libraries (17); librarian (6); librarians (2) | | | |
| classmates (126); classmate (35); schoolmates (5); roommate (6); workmates (3); roommates (3); workmate (1); deskmate (4); mated (1); mate (3); teammates (11); mates (2); schoolmate (1); deskmates (2) | | | |
| swimming (116); swim (63); swam (15); swimmer (9); swims (4); swimmers (3) | | | |
| | | | |
采用与2.1中的方法，可计算出在广州中考更常考察的词汇，覆盖范围差在5%以上的共395个，平均值为10.4%。其中差异最大的为frighten，在广州中考出现概率为33%，而在全国范围仅为5%，相差29%。其它差异较大的词有： | | | | |
| frightened (8); frightening (3) | | | |
| death (21); died (29); dead (18); die (37); deadly (3); dying (7); deaths (4); dies (6) | | | |
| company (86); companies (39); companion (2); accompanying (2) | | | |
| required (17); require (17); requires (28); requiring (2); requirement (1); requirements (5) | | | |
| except (34); exception (1) | | | |
| reduced (4); reduce (51); reduces (5); reduction (3); reducing (10) | | | |
| search (36); searched (4); searching (15); searches (1) | | | |
| effect (27); effects (28); effective (12); effectively (4); effectiveness (2) | | | |
| pressure (27); press (6); pressed (6); impressive (3); impress (2); presses (1); depression (1); impresses (2); impressed (3); impressions (1); impression (2); pressures (1); pressing (3) | | | |
| types (32); type (33); typed (2) | | | |
| adult (29); adulthood (3); adults (39) | | | |
| statements (10); states (22); state (20); stating (1); statement (1) | | | |
| | | | |
| | | | |
| | | | |
| disappearing (9); disappears (5); appeared (47); appearance (13); appears (6); appearing (2); appear (28); disappeared (21); disappear (24); disappearances (2); appearances (1); disappearance (1) | | | |
| across (109); cross (27); crossed (6); crossing (10); crossings (6) | | | |
| regular (16); regularly (7); regulations (1) | | | |
| | | | |
| immediately (17); immediate (3) | | | |
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