By comparison, the gain for low-income Tennessee students after one year of small classes was 7 percentile points.

In the second administration, they found differences ranging from 11 to 55 percentile points.

Scholarship and awareness fell by 55 and 43 percentile points.

It is a straightforward way to derive estimates of standard errors and confidence intervals for complex estimators of complex parameters of the distribution, such as percentile points, proportions, odds ratio, and correlation coefficients.

For example, if the baby's weight is in the 50th percentile but his height is only in the 20th percentile, or his weight suddenly drops two or more percentile points, there could be a growth problem.

For each completed week of gestation, we divided the total number of births into 100 equally sized groups, each representing an increment of 1 percentile point.

The scores went up an average of 3 percentile points for white students, 11 points for Hispanic students and 19 points for black students.

For some perspective, the black-white achievement gap nationally is roughly 34 percentile points.

Fractional percentile points become crucial.

There is no single accepted name for this number; it is also commonly referred to as the "standard normal deviate", "normal score" or "Z score" for the 97.5 percentile point, or .975 point.