Biostatistics: A Foundation for Analysis in the Health - download pdf or read online

By Wayne W. Daniel

ISBN-10: 0471163864

ISBN-13: 9780471163862

Like its predecessors, this variation stresses intuitive realizing of ideas instead of studying through mathematical evidence. offers vast assurance of statistical strategies utilized in all of the overall healthiness technology disciplines. This model incorporates a better emphasis on desktop functions, and many of the statistical innovations contain the MINITAB instructions in which they are often utilized.

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Extra info for Biostatistics: A Foundation for Analysis in the Health Sciences 6th Edition

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It may be that class intervals have been determined by precedent, as in the case of annual tabulations, when the class intervals of previous years are maintained for comparative purposes. A commonly followed rule of thumb states that there should be no fewer than six intervals and no more than 15. If there are fewer than six intervals the data have been summarized too much and the information they contain has been lost. If there are more than 15 intervals the data have not been summarized enough.

Frequently an investigator does not have access to the raw data in which he or she is interested, but does have a frequency distribution. Data frequently are published in the form of a frequency distribution without an accompanying list of individual values or descriptive measures. Readers interested in a measure of central tendency or a measure of dispersion for these data must compute their own. When data are grouped the individual observations lose their identity. By looking at a frequency distribution we are able to determine the number of observations falling into the various class intervals, but the actual values cannot be determined.

4 Descriptive Statistics — Measures of Central Tendency 35 the number of values is odd, the median will be the middle value when all values have been arranged in order of magnitude. When the number of values is even, there is no single middle value. Instead there are two middle values. In this case the median is taken to be the mean of these two middle values, when all values have been arranged in the order of their magnitude. In other words, the median observation of a data set is the (n + 1)/2th one when the observations have been ordered.

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Biostatistics: A Foundation for Analysis in the Health Sciences 6th Edition by Wayne W. Daniel


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