## 6. Application of the average bias formulaWe are interested in seeing how large an effect on cutoffs of different severities have. Table 1 shows the values of () and the bias in for different values of upper (lower) cutoff , and the corresponding completeness percentage of the sample.
In particular, if half of the galaxies are lost because of the upper cutoff (while there is no lower cutoff), formula (18) adopts a simple form, which gives a rough estimate of the bias for such distorted samples. With representative values and
this gives the bias -0.056, or
distances underestimated by about 14 percent, in the average.
Intuitively, one might have expected a more substantial influence of
the © European Southern Observatory (ESO) 1999 Online publication: March 1, 1999 |