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Introduction to biostatistics: Part 2, Descriptive statistics.

Abstract：

:Descriptive statistics include measures of central tendency and variability. Measures of central tendency include mean, median, and mode. The mean is the arithmetic average of data from interval or ratio scales. The median reflects the 50th percentile score. The mode is the most frequently occurring value of a data distribution. Measures of variability include range, interquartile range, standard deviation, and standard error of the mean. The range describes the spread between the extreme values of data. Interquartile range is data included between the 25th and 75th percentile of a distribution. Standard deviation describes variability of data about the sample mean, while standard error of the mean helps describe the distribution of several sample means about a true population mean. Finally, confidence intervals, which are derived from the standard error of the mean, define an interval likely to include a true population value, based on sample statistical values and probability charceristics of data distributions.

journal_name

Ann Emerg Med

journal_title

Annals of emergency medicine

authors

Gaddis GM,Gaddis ML

doi

10.1016/s0196-0644(05)82052-9

subject

Has Abstract

pub_date

1990-03-01 00:00:00

pages

309-15

issue

3

eissn

0196-0644

issn

1097-6760

pii

S0196-0644(05)82052-9

journal_volume

19

pub_type

杂志文章

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