Medical statistics. A textbook for the health sciences by Machin D., Campbell M., Walters S.
By Machin D., Campbell M., Walters S.
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Extra resources for Medical statistics. A textbook for the health sciences
Example text
Three-dimensional charts feature in many spreadsheet packages, but are not recommended since they distort the information presented. 2b the segments which appear nearer the reader are over emphasised. If the sample is further classified into whether or not the baby is a boy or a girl then it becomes impossible to present the data as a single pie or bar chart. We could present the data as two separate pie charts or bar charts side by side but it is preferably to present the data in one graph with the same scales and axes to make the visual comparisons easier.
34, which is unchanged from the previous value. A similar result is obtained for specificity. Sensitivity and specificity are useful statistics because they will yield consistent results for the diagnostic test in a variety of patient groups with different disease prevalences. This is an important point; sensitivity and specificity are characteristics of the test, not the population to which the test is applied. Although indeed they are independent of disease prevalence, in practice if the disease is very rare, the accuracy with which one can estimate the sensitivity will be limited.
On a very simple level and where the probability of an event is known in advance, consider tossing one coin 100 times. Each toss of the coin is a ‘trial’ and the event might be ‘heads’. 5. 48 PROBABILITY AND DECISION MAKING The probability of an event is the proportion of times it occurs in a long sequence of trials. 51, we base our expectation on large numbers of previous births. Similarly, when it is stated that patients with a certain disease have a 50% chance of surviving 5 years, this is based on past experience of other patients with the same disease.