understanding the meaning boxplot
1
0
Entering edit mode
@farahqureshi5-12184
Last seen 7.1 years ago

Greetings!!

can anyone tell me how to understand the contents of boxplot. what does it indicate

boxplot • 1.1k views
ADD COMMENT
0
Entering edit mode

Bioconductor isn't the right place to ask questions about elementary statistical methods. However Google is your friend and it will surely tell you all you need to know.

ADD REPLY
0
Entering edit mode
@peter-langfelder-4469
Last seen 12 days ago
United States

From help(boxplot.stats):

 

    The two ‘hinges’ are versions of the first and third quartile,
     i.e., close to ‘quantile(x, c(1,3)/4)’.  The hinges equal the
     quartiles for odd n (where ‘n <- length(x)’) and differ for even
     n.  Whereas the quartiles only equal observations for ‘n %% 4 ==
     1’ (n = 1 mod 4), the hinges do so _additionally_ for ‘n %% 4 ==
     2’ (n = 2 mod 4), and are in the middle of two observations
     otherwise.

     The notches (if requested) extend to ‘+/-1.58 IQR/sqrt(n)’.  This
     seems to be based on the same calculations as the formula with
     1.57 in Chambers _et al_ (1983, p. 62), given in McGill _et al_
     (1978, p. 16).  They are based on asymptotic normality of the
     median and roughly equal sample sizes for the two medians being
     compared, and are said to be rather insensitive to the underlying
     distributions of the samples.  The idea appears to be to give
     roughly a 95% confidence interval for the difference in two
     medians.

 

ADD COMMENT

Login before adding your answer.

Traffic: 539 users visited in the last hour
Help About
FAQ
Access RSS
API
Stats

Use of this site constitutes acceptance of our User Agreement and Privacy Policy.

Powered by the version 2.3.6