Wissenschaftler haben untersucht, warum so viele Frauen nur ein Kind bekommen. Das Ergebnis der Studie ist erschreckend. Weder Scheidung, Arbeitslosigkeit, noch der Tod des Partners machen so unglücklich, wie das erste Kind.
ncomplete data is a common problem of survey research. Recent work on multiple imputation techniques has increased analysts' awareness of the biasing effects of missing data and has also provided a convenient solution. Imputation methods replace non-response with estimates of the unobserved scores. In many instances, however, non-response to a stimulus does not result from measurement problems ...