CONFIDENCE-INTERVAL ESTIMATION OF INTRACLASS CORRELATION AND OF HERITABILITY FROM PATERNAL HALF-SIB CORRELATION AND PROBLEMS OF SAMPLE-SIZEDETERMINATION

The precision of estimating intraclass correlation coefficient theta a nd of heritability coefficient h(2) is determined not only by the tota l sample size N, but also by the structure of the sample. These proble ms are discussed on basis of expected half width of exact confidence i ntervals. As well in case, that a priori information concerning h(2) o r theta is known as in case that no such information is available, rec ommendations are derived.