Other studies that measured actual frequency, volume and gas content of flatulence, in larger controlled study groups, show that flatulence is correlated to fibre intake. (nutritionfacts.org)
The problem was not in the actual frequency of intercourse (as the unhappy couples might have described it to a marriage counselor) but in their inability to communicate. (religion-online.org)
By comparing the actual frequency of groups of digits to their expected frequency, Pincus and Singer come up with the «approximate entropy» (ApEn) of the sequence — a measure of its randomness. (sciencemag.org)