The problem of the type II statistical error.

  title={The problem of the type II statistical error.},
  author={Robert Mittendorf and V. S. Arun and Anna Maria Sapugay},
  journal={Obstetrics and gynecology},
  volume={86 5},
OBJECTIVE To determine if type II statistical errors (also known as beta errors) are a common problem in published clinical research. METHODS Type II statistical errors occur when sample sizes are too small to show an effect of treatment, even when an effect truly exists. Searching the Medline data base, we identified ten meta-analyses published during 1986-1994 in the American Journal of Obstetrics and Gynecology, Obstetrics and Gynecology, and The Journal of Reproductive Medicine. Meta… CONTINUE READING