So, to a large degree, we are still suffering from what scientists call selection effect.

NPR: What Makes Our Solar System Special?

Another possibility is that there is a selection effect on the children side.

FORBES: Is the preschool rat race a sign of doom?

Vintage players tend to be good, because of a selection effect: If you use a cane and still have a job in the major leagues, it's usually because you can play.

WSJ: New York Yankees: Getting Old Is Nothing to Fear��Tim Marchman

Because the competition has concentrated on risk selection, it has not had the desired bracing effect on medical providers, so health spending has kept on growing.

ECONOMIST: There must be a better way

Humans are dead-end hosts as far as Toxoplasma is concerned, so the exact effect will not have been honed by natural selection and may therefore be different from the one in animals that are actually useful to the parasite.

ECONOMIST: Toxoplasmosis and psychology

Mr Heckman confronted the sample-selection problem: in terms of the examples just given, for instance, the effect on the results if the workers who answered the questionnaire differed in important ways from those who did not.

ECONOMIST: Economics focus

But both the selection bias and regular-phone-use definition might be expected to mask any adverse effect of phones.

ECONOMIST: The Interphone study: Mobile madness | The

Players who joined the ICL were originally given life bans by the BCCI but the 79 players are now free to play domestic cricket with immediate effect, although they will have to wait a year before being eligible for international selection.

BBC: Promoters vow ICL 'will carry on'