B. Li, H. Lingsma, E. Steyerberg, und E. Lesaffre. BMC medical research methodology, (Januar 2011)6214<m:linebreak></m:linebreak>JID: 100968545; OID: NLM: PMC3112198; 2010/08/25 received; 2011/05/23 accepted; 2011/05/23 aheadofprint; epublish;<m:linebreak></m:linebreak>Regressió logística; Mixed models; Multilevel; SAS; R; Stata.