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Prueba De Dunnett Pdf Download
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Prueba De Dunnett Pdf Download
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The quantity which must be added to and/or subtracted from the observed differences between the means to give their confidence limits has been called by Tukey an "allowance" and is given by A = t s 2 N {displaystyle A=ts{sqrt {frac {2}{N}}}} , where t is obtained from Dunnett's Table 1 if one side limits are desired or from Dunnett's Table 2 if two-sided limits are wanted. Contents 1 History 1.1 Multiple Comparisons Problem 1.2 Uses of Dunnetts test 2 Formal description of Dunnett's test 2.1 Assumptions 2.2 Calculation 3 Examples 3.1 Breaking strength of fabric[5] 4 References . The standard deviation is s = 19 = 4.36 {displaystyle s={sqrt {19}}=4.36} and the estimated standard error of a difference between two means is s 2 N = 4.36 2 N = 3.56 {displaystyle s{sqrt {frac {2}{N}}}=4.36{sqrt {frac {2}{N}}}=3.56} . All X i {displaystyle {bar {X{i}}}} of the p + 1 {displaystyle p+1} sets of observations are assumed to be independently and normally distributed with a common variance σ 2 {displaystyle sigma ^{2}} and means μ i {displaystyle mu {i}} . (1964.) "New tables for multiple comparisons with a control", Biometrics, 20:482491. message . Dunnett's test takes into consideration the special structure of comparing treatment against control and results in narrower confidence intervals.[5] It is very common to use Dunnett's test in medical experiments, for example comparing blood count measurements on three groups of animals, one of which served as a control while the other two were treated with two different drugs.
(Due to an approximation made in computing Tables 2a and 2b, the tabulated values of t are somewhat larger than necessary so that the actual p's attained are slightly greater than 95 and 99%.No such approximation was made in computing Tables 1a and 1b). when d i ″ {displaystyle d{i}''} are chosen to satisfy P r o b ( t 1 < d 1 ′ , . controls case we will make only ( k − 1 ) {displaystyle (k-1)} comparisons. The original work on Multiple Comparisons problem was made by Tukey and Scheff. , X p ) {displaystyle ({bar {X{0}}},.,{bar {X{p}}})} , while ( X 1 , . Analogous values of t can be determined from the tables if p=99% confidence is required. (1955.) "A multiple comparison procedure for comparing several treatments with a control", Journal of the American Statistical Association, 50:10961121. The major issue in any discussion of multiple-comparison procedures is the question of the probability of Type I errors. Multiple Comparisons Problem[edit]. & Shrondal A.
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by Lategayno on 2016-08-30 12:28:35
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