Test performance 2007

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Each year, multiple versions of each of the six IELTS modules (Listening, Academic Reading, General Training Reading, Academic Writing, General Training Writing, and Speaking) are released for use by centres testing IELTS candidates. Reliability estimates for the objectively and subjectively scored modules used in 2007 are reported here.

Test performance 2007

Reliability of objectively-scored modules (Reading and Listening)

The reliability of Listening and Reading tests is reported using Cronbach's alpha, a reliability estimate which measures the internal consistency of the 40-item test. The following Listening and Reading material released in 2007 had sufficient candidate responses to estimate and report meaningful reliability values as follows:

Modules All Academic and General Training versions	Alpha by version
Listening version 310	0.89
Listening version 311	0.89
Listening version 312	0.88
Listening version 313	0.91
Listening version 314	0.87
Listening version 315	0.89
Listening version 316	0.88
Listening version 317	0.88
Listening version 318	0.89
Listening version 319	0.90
Listening version 320	0.89
Listening version 321	0.89
Listening version 322	0.90
Listening version 323	0.90
Listening version 324	0.88
Listening version 325	0.87
Average Alpha Across versions	0.89

Average alpha across versions	Alpha by version
Academic Reading version 310	0.85
Academic Reading version 311	0.85
Academic Reading version 312	0.87
Academic Reading version 313	0.87
Academic Reading version 314	0.84
Academic Reading version 315	0.85
Academic Reading version 316	0.88
Academic Reading version 317	0.85
Academic Reading version 318	0.83
Academic Reading version 319	0.90
Academic Reading version 320	0.87
Academic Reading version 321	0.88
Academic Reading version 322	0.89
Academic Reading version 323	0.84
Academic Reading version 324	0.84
Academic Reading version 325	0.90
Average Alpha Across versions	0.86

Average alpha across versions	Alpha by version
General Training version 280	0.91
General Training version 281	0.91
General Training version 282	0.88
General Training version 283	0.90
General Training version 284	0.90
General Training version 285	0.85
General Training version 286	0.88
General Training version 287	0.90
General Training version 288	0.88
General Training version 289	0.86
General Training version 290	0.89
General Training version 291	0.89
General Training version 292	0.88
General Training version 293	0.89
General Training version 294	0.91
Average Alpha Across versions	0.89

The figures reported for Listening and Reading modules indicate the expected levels of reliability for tests containing 40 items. On the basis of these reliability figures, an estimate of the standard error of measurement (SEM) may be calculated for these modules using the following formula:

s t is the standard deviation of the test
r xx' is the reliability of the test

Table 1 Mean, standard deviation and standard error of measurement of Listening and Reading

	Mean	Standard deviation	SEM
Listening	6.06	1.21	0.40
Academic Reading	5.98	1.06	0.39
General Training Reading	5.59	1.26	0.41

Test performance 2007

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