منابع مشابه
Statistics review 2: Samples and populations
The previous review in this series introduced the notion of data description and outlined some of the more common summary measures used to describe a dataset. However, a dataset is typically only of interest for the information it provides regarding the population from which it was drawn. The present review focuses on estimation of population values from a sample.
متن کاملComparing Two Numerical Response Populations: Independent Samples
Chapter 19 is very much like Chapter 15. The major—and obvious—difference is that in the earlier chapter the response was a dichotomy, but in this chapter the response is a number. If you revisit the material on the four types of studies in Section 15.2, you can see that the fact that the response was a dichotomy is irrelevant. In other words, everything you learned earlier about how the interp...
متن کاملFrom samples to populations in retinex models
Some spatial color algorithms, such as Brownian Milano retinex (MI-retinex) and random spray retinex (RSR), are based on sampling. In Brownian MI-retinex, memoryless random walks (MRWs) explore the neighborhood of a pixel and are then used to compute its output. Considering the relative redundancy and inefficiency of MRW exploration, the algorithm RSR replaced the walks by samples of points (th...
متن کاملComparing Two Numerical Response Populations: Independent Samples
Chapter 19 is very much like Chapter 15. The major—and obvious—difference is that in the earlier chapter the response was a dichotomy, but in this chapter the response is a number. If you revisit the material on the four types of studies in Section 15.2, you can see that the fact that the response was a dichotomy is irrelevant. In other words, everything you learned earlier about how the interp...
متن کاملFrom samples to populations: estimation and hypothesis testing.
We previously described how data from family planning research can be presented and summarised.1 In this paper we will describe how to use data obtained from a sample to answer questions about the population. For example, we might use data from a survey to estimate how many women purchase hormonal emergency contraception over-thecounter from pharmacies. Or we might seek to answer the question, ...
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ژورنال
عنوان ژورنال: Archives of Disease in Childhood
سال: 1991
ISSN: 0003-9888,1468-2044
DOI: 10.1136/adc.66.11.1355