# class interval

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Related to class interval: Class mark

## class interval

[¦klas ′int·ər·vəl]
(statistics)
One of several convenient intervals into which the values of the variate of a frequency distribution may be grouped.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Class intervals were determined using the Spiegel equation: CI = A/NC, where A = amplitude, NC (number of classes) = 1 + 3.3 log (n) and n = number of individuals (Felfili, 1995).
Majority of the CIMT<0.9 mm group patients belonged to the male gender class interval (n=5, 50%).
Using the 'narrow' interval, the probability of success (observed value falling within the class interval) fell to 36%.
The data illustrated that frequency of access across the various class intervals, of podcasts was not equitably distributed during both years.
The reduced data set with n = 289 was divided to k = 9 intervals according to the (5) formula and as the outliers testing gave us a data set whose values vary in the range of <0; 0.19>, we will get the h = 0.02 width of the class interval by fractioning the highest value by the k parameter and by rounding the result to centimetres.
Unlike the Poisson distribution which is discrete distribution considering the counts of vehicles, a negative exponential model is a continuous curve taking into account frequency class interval. It describes times between events in the Poisson process and can be derived from the equation of probability mass function for Poisson.
Studies were divided into three class intervals (ie, three groups of studies of different levels of 'quality,' low, medium and high).
Use a class interval of size \$2,500 to form a frequency distribution for the data.
Efficiency improvements to the estimator, by Bakker (1997), demonstrated that to use equation (6) in a frequency context it is necessary to divide the density's domain into K class intervals, such that the probability associated with the kth class interval is:
Majority of the hypothyroid Group patients belonged to the 31-40 years age class interval (n=13, 35.14%) with a mean age of 35.37 years.
The tables in this publication include data on the number of staff employed in Title IV postsecondary institutions in fall 2006 by primary occupational activity, length of contract/teaching period, employment status, salary class interval, faculty and tenure status, academic rank, race/ethnicity, and gender.

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