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Frequency distribution.

Manikandan S - J Pharmacol Pharmacother (2011)

View Article: PubMed Central - PubMed

Affiliation: Assistant Editor, JPP.

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On the other hand, if they are very few, then the shape of the distribution itself cannot be determined... Generally, 6–14 intervals are adequate... All the bars need not be of equal width in a histogram (depends on the class interval), whereas they are equal in a bar diagram... The area of each bar corresponds to the frequency in a histogram whereas in a bar diagram, it is the height [Figure 1]... A frequency polygon is constructed by connecting all midpoints of the top of the bars in a histogram by a straight line without displaying the bars... A frequency polygon aids in the easy comparison of two frequency distributions... When the total frequency is large and the class intervals are narrow, the frequency polygon becomes a smooth curve known as the frequency curve... The line inside the box denotes the median (sometimes marked as a plus sign)... The position of the median indicates whether the data are skewed or not... These whiskers are 1.5 times the length of the box, i.e., the interquartile range (IQR)... The end of whiskers is called the inner fence and any value outside it is an outlier... If the distribution is symmetrical, then the whiskers are of equal length... If the data are sparse on one side, the corresponding side whisker will be short... The outer fence (usually not marked) is at a distance of three times the IQR on either side of the box.

No MeSH data available.


Schematic diagram of a “box and whisker plot”
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Figure 0003: Schematic diagram of a “box and whisker plot”

Mentions: The lines outside the box on either side are known as whiskers [Figure 3]. These whiskers are 1.5 times the length of the box, i.e., the interquartile range (IQR). The end of whiskers is called the inner fence and any value outside it is an outlier. If the distribution is symmetrical, then the whiskers are of equal length. If the data are sparse on one side, the corresponding side whisker will be short. The outer fence (usually not marked) is at a distance of three times the IQR on either side of the box. The reason behind having the inner and outer fence at 1.5 and 3 times the IQR, respectively, is the fact that 95% of observations fall within 1.5 times the IQR, and it is 99% for 3 times the IQR.[5]


Frequency distribution.

Manikandan S - J Pharmacol Pharmacother (2011)

Schematic diagram of a “box and whisker plot”
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3117575&req=5

Figure 0003: Schematic diagram of a “box and whisker plot”
Mentions: The lines outside the box on either side are known as whiskers [Figure 3]. These whiskers are 1.5 times the length of the box, i.e., the interquartile range (IQR). The end of whiskers is called the inner fence and any value outside it is an outlier. If the distribution is symmetrical, then the whiskers are of equal length. If the data are sparse on one side, the corresponding side whisker will be short. The outer fence (usually not marked) is at a distance of three times the IQR on either side of the box. The reason behind having the inner and outer fence at 1.5 and 3 times the IQR, respectively, is the fact that 95% of observations fall within 1.5 times the IQR, and it is 99% for 3 times the IQR.[5]

View Article: PubMed Central - PubMed

Affiliation: Assistant Editor, JPP.

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

On the other hand, if they are very few, then the shape of the distribution itself cannot be determined... Generally, 6–14 intervals are adequate... All the bars need not be of equal width in a histogram (depends on the class interval), whereas they are equal in a bar diagram... The area of each bar corresponds to the frequency in a histogram whereas in a bar diagram, it is the height [Figure 1]... A frequency polygon is constructed by connecting all midpoints of the top of the bars in a histogram by a straight line without displaying the bars... A frequency polygon aids in the easy comparison of two frequency distributions... When the total frequency is large and the class intervals are narrow, the frequency polygon becomes a smooth curve known as the frequency curve... The line inside the box denotes the median (sometimes marked as a plus sign)... The position of the median indicates whether the data are skewed or not... These whiskers are 1.5 times the length of the box, i.e., the interquartile range (IQR)... The end of whiskers is called the inner fence and any value outside it is an outlier... If the distribution is symmetrical, then the whiskers are of equal length... If the data are sparse on one side, the corresponding side whisker will be short... The outer fence (usually not marked) is at a distance of three times the IQR on either side of the box.

No MeSH data available.