The phrase "a measure of the number of" is correct and usable in written English.
It can be used when discussing quantification or assessment of a specific quantity or value in various contexts, such as statistics or research.
Example: "The study provides a measure of the number of participants who completed the survey."
Alternatives: "an assessment of the quantity of" or "a quantification of the amount of".
Entropy is a measure of the number of ways in which energy can be distributed in any system.
For 2007, the overall domestic load factor, a measure of the number of available seats occupied by paying passengers, was 79.9percentt.
The official figures showed the quarterly under-utilisation rate, a measure of the number of people with work but looking for more, had risen 0.1%.
He found that the larger the volume of gray matter -- a measure of the number of brain cells -- the higher a person's intelligence was likely to be.
The weekly jobless claims data (a measure of the number of people signing on for unemployment benefit for the first time) fell by 26,000 last week to a four-year low of 350,000.
The exchange will allow advertising impressions -- a measure of the number of times an ad is seen -- sold by online publishers to be traded at higher prices, he said.
But it is fair to say that such data is a lot less coldly indisputable than a measure of the number of people who saw an ad and then bought something.
In military lingo, they are weighed down by their "tooth to tail" ratio – a measure of the number of actual fighters in comparison to the support personnel and equipment the fighters require.
Separately, a measure of the number of Americans who signed contracts to buy homes rose in January from December to the highest level in more than two and a half years.
The receptive field is essentially a measure of the number of receptors rods or cones or a mixture of these that make nervous connections with a single ganglion cell.
Team tenure is a measure of the number of issues resolved by a given team.
