You accept uncritically the view of one professor who has dismissed the 1990 census undercount as inconsequential.
Only 680, 000, though the internal migration data for Africa are weak and therefore a comparative undercount is likely.
That turned to out to be a 27% undercount (based on the consensus of 42.7 million iPads sold in 2011).
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If no sampling were used, the likely undercount would be around 1.9%.
My list is no doubt an undercount. 1.5 million American students and 1, 000 colleges worldwide use iPads (see this infographic by MDG Advertising).
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The question of whether "one out of four" constitutes adequate representation will likely be an issue in upcoming redistricting battles, with the undercount a point of contention.
And, Dr Roberts says, passive-surveillance systems tend to undercount mortality.
In 2000 the census takers reported an undercount of 1.81%.
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Funding for public services such as health, police and fire services relies on population estimates, which undercount short-term visitors and those who live at business addresses, such as hotel staff.
The 1.6% undercount of the population in the 1990 census, which you and he cite, is a net figure which includes an actual undercount of 3.4% and a double count or otherwise incorrect count of another 1.8%.
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