These private schools may be religious or sectarian in nature. The overwhelming majority of public schools are not eligible for pricing because they do not charge students specific tuition or fixed fees. In many cases, families send all of their children to the same school. To accommodate this, multiple students of the same family are eligible for pricing in this index. Charges for room and board, textbooks, lunch and uniform rental are covered elsewhere in the CPI sample.
Institutions being priced for the E-HS tuition index are eligible to be priced on a monthly basis.
However, almost all elementary and high schools make any adjustments to their tuition and fixed fees before the start of each new academic year. To reduce the burden on the schools' respondents, as well as the cost of the CPI program, the pricing frequency is reduced. Most institutions are required to be priced 2 months per year. The first selected pricing month is normally the month where price changes are most likely to occur. The second selected pricing month is 2 months after the first pricing month, and is normally used to check the accuracy of the data already collected.