undersampled

Maley and Marshall 1998: To be confident in our hypotheses of relations among the animal phyla we need to gather more DNA sequences, especially from undersampled phyla; develop better methods of DNA analysis on the basis of more realistic models of DNA evolution; and develop independent data sets using morphological, developmental, and other molecular data to corroborate or falsify specific hypotheses or to combine in total-evidence analyses.

Building Trees Sequentially 2008

In fact, the normal 4 channel video downlink from ISS is undersampled relative to normal NTSC so that it fits into available bandwidth.

Only NASA Could Make Space Exploration Boring - NASA Watch 2008

Since women who married out of the faith were undercounted on the lists, they were undersampled, and it appeared that fewer Jewish women married out than was actually the case.

Intermarriage and Conversion in the United States. 2009

Also, based on the huge overall increase of people participating in the primaries to-date, it's clear that Obama is bringing people out who haven't previously bothered and are very likely undersampled in these polls, both on the Democrat and Independent side.

Obama Closing On Hillary In Another National Poll 2009

In short the groups that support Obama are undersampled and those less likely to support Obama or participate in voting at that high of percentage are oversampled.

Poll: National Race Tightening; McCain's Advantage On Leadership Holding Firm 2009

Another issue: they also undersampled lower income voters.

Poll: McCain Ahead In Florida 2009

I think there's strong evidence that the black vote in Georgia is being undersampled in these polls.

Polls: Obama Sealing The Deal In Colorado And Virginia, Running Well In Other Red States 2009

This occurs with other factors as well, for example the "Shy Tory" effect, which undersampled Conservative voters in British elections.

TPM Track Composite: Presidential Race Could Be Tightening 2009

This WMUR sample didn't include Friday night, when young voters are dramatically undersampled.

Election Central | Talking Points Memo | CNN/UNH Poll: Obama Rockets To Ten-Point Lead 2009

The other polls still show Udall with some kind of lead (other than Quinnipiac, though its crosstabs make it look like they undersampled Democrats), and not a single poll has come out with Schaffer holding any kind of lead.

Sean Wang: A Look at the 2008 Senate Races, August Edition 2008