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count heads

To count the number of people in a group to ensure that everyone is present. Everyone, take your seats on the bus so that I can count heads before we leave the museum.
See also: count, head
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

count

heads/noses
To make a count of members, attendees, or participants.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Some other languages, such as Warlpiri in Australia, also use a one-two-many counting system, Gordon notes.
Though the recent studies on counting that have investigated either the cost of the coordination or counting span development have led to disconcerting results, we would like to suggest that it would be premature to jettison the resource hypothesis.
The need to limit the voltage in order to obtain a certain resolution necessitates longer counting times to compensate for the reduced intensities, and may also require the choice of x-ray lines of lower excitation energy (L rather than K, or M rather than L).
The security system regarding the counting centres has been elaborated.
Oddly enough, by this measure, the infinite set of counting numbers {1, 2, 3, ...} is the same size as the infinite set of even numbers {2, 4, 6, ...}, despite the fact that the even numbers make up precisely half of the counting numbers.
However, if the uncertainty budget is large without considering the counting statistics, there may be no significant advantage to counting longer or at higher rates.
If true, counting machines alone could have made as many as 100,000 mistakes this year--an average of 2,000 votes per state.
They found that 15-month-olds were equally interested in both the correct and incorrect counting, but that 18-month-olds showed far more interest in the correct counting sequence.
He says that many lab experiments have suggested counting ability in captive animals, and the new study provides one of the first examples of animals' counting in nature.
Companies that engage in cycle counting commonly estimate inventory shrinkage from the time of the last physical inventory count to year-end (stub period) for both financial and tax accounting purposes.
When the counting is done, the count sheet is given to data entry staff, who enter the data into a computer using a keyboard.
There are at least five levels of sophistication in CIM: parts counting, which watches machine cycle efficiency; process monitoring, which collects machine operating data for preventive maintenance; statistical process-control (SPC) analysis, which crunches key variables into X-bar and R charts; auxiliary-equipment monitoring, which refines machine data and raises efficiency; and integration of shop-floor data with office business systems, such as materials requirements planning (MRP) or manufacturing resources planning (MRP-II) software.
She's also aware, however, that a spirited debate has emerged about whether the line of research that she's championed really taps into an inborn counting mechanism in the human brain.
* Counting participants: A great deal of confusion exists in the area of counting participants, but it is important to count them correctly.