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Fig. 4 | BMC Medical Research Methodology

Fig. 4

From: Item response theory and differential test functioning analysis of the HBSC-Symptom-Checklist across 46 countries

Fig. 4

Item and test information functions for the unidimensional GRM. Notes. ρ represents the empirical marginal reliability. Items (1) headache, (2) stomachache, (3) backache, (4) feeling low, (5) irritability/bad temper, (6) feeling nervous, (7) difficulties in getting to sleep, (8) feeling dizzy. The abbreviations of the country names can be found in Table 1

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BMC Medical Research Methodology

ISSN: 1471-2288

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