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11-Unit11

# Examples of discrete variables are gender of persons

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Unformatted text preview: h value of a discrete variable is distinct and separate. Examples of discrete variables are gender of persons (male/female) occupation (salaried, business, profession) car size (800cc, 1000cc, 1200cc) In practice, all variables are treated as discrete units, the continuous variables being stated in some discrete unit size according to the needs of a particular situation. For example, length is described in discrete units of millimetres or a tenth of an inch. Class Intervals: Ordinarily, the number of class intervals may not be less than 5 not more than 15, depending on the nature of the data and the number of cases being studied. After noting the highest and lower values and the feature of the data, the number of intervals can be easily determined. For many types of data, it is desirable to have class intervals of uniform size. The intervals should neither be too small nor too large. Whenever possible, the intervals should represent common and convenient numerical divisions such as 5 or 10, rather than odd division such as 3 to 7. Class intervals must be clearly designated in a frequency table in such a way as to obviate any possibility of misinterpretation of confusion. For example, to present the age group of a population, the use of intervals of 1-20, 20-50, and 50 and above would be confusing. This may be presented as 1-20, 21-50, and above 50. Sikkim Manipal University Page No. 164 Research Methodology Unit 11 Every class interval has a mid point. For example, the midpoint of an interval 1-20 is 10.5 and the midpoint of class interval 1-25 would be 13. Once class intervals are determined, it is routine work to count the number of cases that fall in each interval. One-Way Tables: One-way frequency tables present the distribution of cases on only a single dimension or variable. For example, the distribution of respondents of gender, by religion, socio economic status and the like are shown in one way tables (Table 10.1) lustrates one-way tables. One way tables are rarely used since the result of frequency...
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