Download ActivEpi Companion Textbook: A supplement for use with the by David G. Kleinbaum, Kevin M. Sullivan, Nancy D. Barker PDF
By David G. Kleinbaum, Kevin M. Sullivan, Nancy D. Barker
This better half Textbook supplementations the ActivEpi CD-ROM, bought individually. The ActivEpi CD-ROM presents a multimedia presentation of ideas, more often than not taught in an introductory epidemiology direction. ActivEpi mixes a whole array of media to encourage, clarify, visualize and practice epidemiological techniques. nearly the entire fabric at the ActivEpi CD-ROM is integrated within the better half Textbook. simply because participants fluctuate of their studying abilities, the ActivEpi CD-ROM and the ActivEpi better half Textbook provide readers diverse yet comparable suggestions on the right way to study epidemiology. The Textbook can be utilized as a hardcopy reference of the textual fabrics contained at the CD-ROM, as a source for the perform workouts, as a normal reference, or perhaps a self-contained textbook. ActivEpi comprises 15 classes and over 50 hours of content material through greater than 250 launchable actions and homework routines. it may be utilized in numerous instructing codecs: distance studying, self-paced studying, on-campus classes, and brief classes. For the newest additions to ActivEpi, stopover at David Kleinbaum's website.
Read or Download ActivEpi Companion Textbook: A supplement for use with the ActivEpi CD-ROM PDF
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Additional info for ActivEpi Companion Textbook: A supplement for use with the ActivEpi CD-ROM
1007/978-1-4614-5428-1_3, © Springer Science+Business Media New York 2013 37 38 Lesson 3. Epidemiologic Study Designs Randomization Randomization is an allocation procedure that assigns subjects into (one of the) the exposure groups being compared so that each subject has the same probability of being in one group as in any other. Randomization tends to make demographic, behavioral, genetic, and other characteristics of the comparison groups similar except for their exposure status. As a result, if the study finds any difference in health outcome between the comparison groups, that difference can only be attributable to their difference in exposure status.
This is important for evaluating causality. Also, the directionality chosen affects the way subjects can be selected into the study. Designs that are backwards or non-directional have more potential for selection bias than forward designs. Selection bias will be addressed in more detail in a later lesson of this program. Summary Directionality answers the question: when did you observe the exposure variable relative in time to when you observed health outcome? Directionality can be forward, backward, or non-directional.
This investigation led to the hypothesis that a misting machine for vegetables in a grocery store was the source of the outbreak. This misting machine was removed from the grocery store and sent to CDC where laboratory staff was able to isolate Legionella organisms from aerosols produced by the machine. This source was a previously unrecognized vehicle for the transmission of Legionella bacteria. Note: The Bogalusa study provides an example in which there are several exposure variables that are candidates as the primary source of the health outcome being studied.