By Christopher A. Janicak
Utilized facts in Occupational security and overall healthiness, moment variation, offers occupational safeguard and healthiness pros with an introductory advisor to easy information and knowledge research. This publication is written in an easy-to-understand structure with step by step techniques to investigate info utilizing quite a few statistical options. during this moment variation new and up-to-date examples are supplied in addition to extra statistical exams. themes during this ebook comprise statistical methods for studying potential, descriptive statistical tools, correlations, regression, and non-parametric statistical assessments. on the finish of every bankruptcy, the writer has supplied pattern difficulties and options.
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Additional resources for Applied Statistics in Occupational Safety and Health
Ordinal means order, and ordinal data allows the researcher to order the data in some fashion. Examples of ordinal data include any type of ranking exercise, such as requiring the respondent to rank items from 1 to 10. Likert 39 40 CHAPTER 4 scales are another form of ordinal data. When a person is asked to select a number on a Likert scale, it is possible to arrange the answers into some order from best to worst, highest to lowest, etc. Likert scales are considered a form of continuous data; however, the concept of magnitude does not exist.
On the hypothetical bell-shaped curve, the mean, median, and mode are all the same number and are located at the center of the curve. Measures of Variability There are three measures of variability. These measures indicate the spread of the data and are the range, variance, and standard deviation (Hays 1988, 171–76). RANGE The range of a data set is the difference between the lowest value and the highest value data points. In order to calculate the range, the data must be arranged from lowest to highest.
Once organized, the data can be compared to other data that are similarly organized. These organized data are referred to as distributions. Frequencies Frequency is the number of times an event occurs. For example, if a safety manager collects and counts the back injury claims for a given year and comes up with 120, then the frequency of back injuries for the year is 120. The simplest method for organizing frequencies is with a frequency distribution, which can be developed using either grouped or ungrouped data.