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- W2102904443 abstract "In covering these objectives we will deal with the following terms:In the first article of this series, we discussed graphical and tabular summaries of single datasets. This is a useful end point in its own right but often in clinical practice we also wish to compare datasets. Carrying this out by simply visually identifying the differences between two graphs or data columns lacks precision. Often therefore the central tendency and variability is also calculated so that more accurate comparisons can be made.It is usually possible to add to the tabular or graphical summary, additional information showing where most of the values are and their spread. The former is known as the central tendency and the latter the variability of the distribution. Generally these summary statistics should not be given to more than one extra decimal place over the raw data.Key point Central tendency and variability are common methods of summarising ordinal and quantitative data ### CENTRAL TENDENCYThere are a variety of methods for describing where most of the data are collecting. The choice depends upon the type of data being analysed (table 1).View this table: Table 1 Applicability of measure of central tendency #### MeanThis commonly used term refers to the sum of all the values divided by the number of data points. To demonstrate this consider the following example. Dr Egbert Everard received much praise for his study on paediatric admissions on one day to the A&E Department of Deathstar General (article 1). Suitably encouraged, he reviews the waiting time for the 48 paediatric cases involved in the study (table 2).View this table: Table 2 Waiting time for paediatric A&E admissions in one day to Deathstar General Considering cases 1 to 12, the …" @default.
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- W2102904443 title "An introduction to everyday statistics--2" @default.
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- W2102904443 doi "https://doi.org/10.1136/emj.17.4.274" @default.
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