A Methodology for the Health Sciences - part 6 potx
A Methodology for the Health Sciences - part 6 potx
... into halves at random. One can estimate the parameters from one-half of the data and then predict the values for the remaining unused half of the data. The evaluation of the fit can be performed ... nonsignificant, we may accept the quadratic equation as appropriate. Figure 11.5 is a scatter diagram of the data as well as the linear and quadratic curves. Note that the...
Ngày tải lên: 10/08/2014, 18:21
A Methodology for the Health Sciences - part 7 potx
... investigations may take a long time and therefore where it is desirable to aim at drawing reasonably firm conclusions from the same data as used in exploratory analysis. What statistical approaches and principles ... with such analyses are data driven and subgroup analysis. Aside from the assignment of appropriate p-values, there is the more important question of the scientific status...
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A Methodology for the Health Sciences - part 1 doc
... distinguish between a variable and the value of a variable in the same way that the label “title of a book in the library” is distinguished from the title Gray’s Anatomy. A variable will usually be represented ... 151–180. Math- ematically, the ERFD and the ECD are equivalent. Ad majorem Dei gloriam viii CONTENTS 15. Rates and Proportions 64 0 16. Analysis of the Tim...
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A Methodology for the Health Sciences - part 2 pptx
... statistically independent random variables, then for any two constants a 1 and a 2 , the random variable W = a 1 Y 1 + a 2 Y 2 has mean and variance E(W ) = a 1 E(Y 1 ) +a 2 E(Y 2 ) Var(W ) = a 2 1 Var(Y 1 ) ... value, the smaller the area (probability) in the tail. This tail probability is usually called the p-value. For example (using Table A. 2), the area to...
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A Methodology for the Health Sciences - part 3 pps
... 5 969 5 864 5 5 966 5 862 6 5358 565 8 7 5152 565 4 Mean 60 . 86 65. 86 64.29 62 . 86 Table 6. 5 Horse-kick Fatality Data Number of Deaths per Corps per Year Frequency 0 109 165 222 33 41 50 60 188 COUNTING DATA α, ... weight, what is the exact two-sided p-value for testing the null hypothesis π = 1/2? 6. 3 Edwards and Fraccaro [1 960 ] present Swedish data about the gen...
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A Methodology for the Health Sciences - part 4 pot
... 9.3. For the data in Table 9.4, r 2 = 36, 464 .2 53 ,63 7.3 = 0 .67 983 That is, approximately 68 % of the variation in mortality can be attributed to variation in latitude. Equivalently, the variation ... before a category with K tied observations, the average rank for the k tied observations is average rank = 2J + K + 1 2 (9) For these data, the average ranks are compu...
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A Methodology for the Health Sciences - part 5 pdf
... Buchanan. ONE-WAY ANALYSIS OF VARIANCE 361 10.2.2 Using the Normal Distribution Model Basic Approach The one-way analysis of variance is a generalization of the t-test. As in the motivating example above, ... transformations are: logarithmic, square root, reciprocal, and arcsin √ . These transformations are nonlinear. Linear transformations do not alter the analysis of variance t...
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A Methodology for the Health Sciences - part 8 ppt
... total), calculate standardized death rates for halothane and cyclopropane. Are the standardized rates significantly different? (c) Calculate the standardized mortality rates for halothane and ... 0.984 563 6 0.09 262 1 1.000000 a The variance explained by each factor is the eigenvalue for that factor. Total variance is defined as the sum of the diagonal elements of the c...
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A Methodology for the Health Sciences - part 9 pps
... standard deviations determine the correlations. These data have a correlation for measurements that are one year apart of 0.734, 0.733, and 0.8 06. For measurements two years apart, the correlation ... “maintain” the favorable status. Statistical inference can be based on standard two-sample methods for binary data (see Chapter 6) . An analysis that summarizes current status at...
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A Methodology for the Health Sciences - part 10 pps
... statistic. The concordance is the product of the accuracy and the precision; it is also bounded by 1. The data in Table 20.2 are ana- lyzed according to the criteria above and displayed in Table ... can be measured by the extent to which a technician’s readings are from a 45 ◦ line. A paper by Lin [1989] nicely provides a framework for analyzing these data. In our case...
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