300 énigmes - download pdf or read online

By Nicolas Conti

ISBN-10: 2754003568

ISBN-13: 9782754003568

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On the other hand with hundreds, or even thousands, of observations, the problems of da ta management become severe. Although model fitting is apparently more precise, it becomes harder to control the quality oflarge data sets, and one must still ask if the data are representative. As already noted in Chapter 4, it is often better to collect an inter mediate size sampie of good quality rather than a large, but messy, data set. Effective supervision of da ta collection is crucial. The number of variables is also important.

Thus an outlier may be caused by an error, but it is important to consider the alternative possibility that the observation is a genuine extreme result from the 'tail' of the distribution. '. 2, including the following: 1. 2. 3. 4. A recording error arises for example when an instrument is misread. A typing error arises when an observation is typed incorrectly. A transcription error arises when an observation is copied incorrectly, and so it is advisable to keep the amount of copying to aminimum.

Give row and column averages where meaningful, and perhaps the overall average. Obviously if different columns, say, relate to different variables then only column averages will be meaningful. Sometimes totals or medians, rather than averages, will be appropriate. 3. Consider re-ordering the rows and the columns so as to make the table dearer. g. order columns by the size of the column averages). 4. Consider transposing the table. It is easier to look down a column than across a row, so that one generally arranges the number of rows to exceed the number of columns.

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300 énigmes by Nicolas Conti


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