Read e-book online A dictionary of statistical terms PDF

By Maurice G. Kendall, William R. Buckland

ISBN-10: 0050022806

ISBN-13: 9780050022801

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505 provides a chance of >5% that the null hypothesis of no effect can be rejected. The null-hypothesis cannot be rejected. , if one is twice the other, then a more adequate calculation of the pooled standard error is as follows. 101 -3 -2 -1 0 1 2 3 4 5 SEMs Figure 2. Two t-distributions with n = 20: lower curve H1 or actual SEMdistribution of the data, upper curve H0 or null hypothesis of the study. The lower graph of Figure 2 is the probability distribution of this t-distribution. H0 (the upper graph) is an identical distribution with mean = 0 instead of mean = mean1 – mean2 and with SEM identical to the SEM of H1, and is taken as the nullhypothesis in this particular approach.

6 9 10. 5 for both of them. THE ANALYSIS OF EFFICACY DATA OF DRUG TRIALS 37 The Wilcoxon signed rank test uses the signs and the relative magnitudes of the data instead of the actual data (Table 10). We have 3 steps: 1. 5); 2. 5 3. The null hypothesis is that there is no difference between + = andranknumbers. We assess the smaller of the two ranknumbers. The test is significant if the value is smaller than could be expected by chance. We consult the Wilcoxon signed rank table showing us the upper values for 5%, and 1% significance, for the number of differences constituting our rank.

For cell a this is α = [(a+b+c)/(a+b+c+d+e+f )] x (a+d). Do the same for each cell and add-up α = [(a+b+c)/(a+b+c+d+e+f)] x (a+d) β ..... γ δ = [(d+e+f))/(a+b+c+d+e+f)] x (a+d) ε .... ξ .... 175 (b- ... 903 (c- ... 663 (d- ... 282 (e- ... 305 (f- ... 001 according to the chisquare table (see APPENDIX). Another example is given, a 2x3 table: Hypertension hypertens-yes / hypertens-no / don´t know Group 1 (a) n = 60 (c) n = 40 (e) n = 60 Group 2 (b) n = 50 (d) n = 60 (f) n = 50 Give best estimate population.

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A dictionary of statistical terms by Maurice G. Kendall, William R. Buckland


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