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the extent of arithmetic is saved to a minimal to make the fabric simply available to the beginner, and a mess of illustrative instances are integrated in each bankruptcy, drawn from the present examine literature. The re-creation has been thoroughly revised and up to date and comprises new chapters on uncomplicated quantitative equipment, measuring survival, dimension scales, diagnostic trying out, bayesian tools, meta-analysis and systematic experiences.
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Additional resources for Medical statistics from scratch: an introduction for health professionals
12 as contingency tables rather than frequency tables (although they are the same thing). A contingency table represents the frequency values for one group of individuals, but separated into sub-groups, as here for the smoking and non-smoking mothers. 11 A cross-tabulation of the variables ‘Mother smoked during pregnancy? (Y/N)’ and ‘Apgar score <7? 5) Apgar < 7 Mother smoked? 11, but with values expressed as percentages of the column totals Apgar < 7 (%) Mother smoked? 5 mothers (3). 3 per cent with mothers who hadn’t.
11 A cross-tabulation of the variables ‘Mother smoked during pregnancy? (Y/N)’ and ‘Apgar score <7? 5) Apgar < 7 Mother smoked? 11, but with values expressed as percentages of the column totals Apgar < 7 (%) Mother smoked? 5 mothers (3). 3 per cent with mothers who hadn’t. These results might provoke you into thinking that maybe there’s a link of some sort between these two variables. Note that when appropriate you can also express the cross-tabulation with values as percentages of the row totals.
You can of course ask such questions in reverse, for example, what birthweight marks the lowest 50 per cent of birthweights? This time you would start with a value of 50 per cent 4 5 The ‘g’ in ogive is pronounced as the j in ‘jive’. Unfortunately, I couldn’t find a program that would allow me to join the points with a smooth curve. 3 on the vertical axis, move right to the ogive, then down to the value of about 3700 g on the horizontal axis. 12 Percentage cumulative frequency curves for total cholesterol concentration in two groups.