A Methodology for the Health Sciences - part 10 pps
A Methodology for the Health Sciences - part 10 pps
... precision and the accuracy, averaged over the two neuropathologists is com- parable to their concordance. As usual, it is very important to graph the data to confirm these analytical results by a graphical ... seemed strange to me because the panel had not indicated that the drug, tPA, was bad but only that in a number of areas the data needed to be gathered and analyzed more a...
Ngày tải lên: 10/08/2014, 18:21
A Methodology for the Health Sciences - part 3 pps
... weight, what is the exact two-sided p-value for testing the null hypothesis π = 1/2? 6.3 Edwards and Fraccaro [1960] present Swedish data about the gender of a child and the parity. These data are: Order ... Inference for the Poisson Distribution Normal Approximation to the Poisson Distribution The Poisson distribution has the property that the mean and variance are eq...
Ngày tải lên: 10/08/2014, 18:21
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 0.806. For measurements two years apart, the correlation ... observa- tions that are two visits apart have correlation ρ 2 , and in general all pairs of observations that are k visits apart have correlation ρ k . A banded correlation matrix wi...
Ngày tải lên: 10/08/2014, 18:21
A Methodology for the Health Sciences - part 1 doc
... by the examples above, we must specify two aspects of a variable: the scale of measurement and the values the variable can take on. Some quantitative variables have numerical values that are ... 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...
Ngày tải lên: 10/08/2014, 18:21
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...
Ngày tải lên: 10/08/2014, 18:21
A Methodology for the Health Sciences - part 4 pot
... 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 computed as follows: KJAverage ... computation as noted before. These data, ranked by absolute value, with average ranks replacing the given rank when the absolute values are tied, are shown below. The first row (A)...
Ngày tải lên: 10/08/2014, 18:21
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, ... this for these data.) The anova table is presented in Table 10. 14. Table 10. 6 Layout for the One-Way anova Source of Variation d.f. SS a MS F-Ratio d.f. of F -R...
Ngày tải lên: 10/08/2014, 18:21
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 ... 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 quadratic curve is hig...
Ngày tải lên: 10/08/2014, 18:21
A Methodology for the Health Sciences - part 7 potx
... hoc analysis. Such an analysis is not explicitly planned at the start of the study but suggested by the data. Other terms associated with such analyses are data driven and subgroup analysis. Aside ... 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 can be use...
Ngày tải lên: 10/08/2014, 18:21
A Methodology for the Health Sciences - part 8 ppt
... standardization (relative to the total), calculate standardized death rates for halothane and cyclopropane. Are the standardized rates significantly different? (c) Calculate the standardized mortality ... period dropouts O ′ i = L D O ′ i The paper reports rates of 2.7 deaths per 100 person-years for the active participants based on 16 deaths. The mortality rate for drop...
Ngày tải lên: 10/08/2014, 18:21