... designs, 627 18 .10 Meta-analysis, 6 41 19 Statistical methods in epidemiology, 648 19 .1 19.2 19 .3 19 .4 19 .5 19 .6 19 .7 19 .8 19 .9 19 .10 19 .11 19 .12 19 .13 Introduction, 648 The planning of surveys, ... Modelling continuous data, 312 11 .1 Analysis of variance applied to regression, 312 11 .2 Errors in both variables, 317 11 .3 Straight lines through the origin, 320 11 .4 Regression in groups, 322 11 .5 ... membranes) Relative frequency (%) 0± 10 ± 20± 30± 40± 50± 60± 70± 80± 90± 10 0± 11 0 11 9 14 14 17 1 18 18 21 10 11 1 Total 80 10 1 Quantitative variables are those for which the individual observations are...