The only way to ensure randomness is to make sample selections independent of human judgement.

In quota sampling, there is non-random sample selection and this can be unreliable.

In 1964, it became the first ratings service in the world to introduce computerized sample selection.

While this sample selection may be viewed as a limitation of this study, it is also its strength.

The panel were both surprised and impressed with the range, quality and value for money of the sample selection that we tasted.

And the doctor would never travel without a sample selection of condoms, which he freely dispensed without invitation.

Therefore earlier reports on the male-biase among billionaire offspring were partially an artifact of sample selection.

According to one source, original sample selection took place in mid-1997.

The methodological guide does not provide a clear enough picture to allow a researcher to replicate the sample selection process.

Academic criticisms were made pertaining to sample selection and sample bias in the reports' methodology.