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Re: Box-Whisker plots in IDL [message #55388 is a reply to message #55387]

Mon, 20 August 2007 17:37

Marshall Perrin
Messages: 44
Registered: December 2005

Member

teich@atmsci.msrc.sunysb.edu <teich@atmsci.msrc.sunysb.edu> wrote:
> lower_ind=where(sorted_data lt median(sorted_data,/even))
> upper_ind=where(sorted_data gt median(sorted_data,/even))
> qtr_25th=median(sorted_data[lower_ind(0):lower_ind(n_element s(lower_ind)-1)],/
> even)
> qtr_75th=median(sorted_data[upper_ind(0):upper_ind(n_element s(upper_ind)-1)],/
> even)

Pardon me, but I think your calculation for the 25th and 75th percentiles here
is in deep trouble. lower_ind is a set of discrete and discontinuous indices,
so it's not correct to subscript sorted_data using the range construct
like that! You really want just

qtr_25th=median(sorted_data[lower_ind])
qtr_75th=median(sorted_data[upper_ind])

Cheers,

- Marshall

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[Message index]

		Re: Box-Whisker plots in IDL By: David Fanning on Mon, 20 August 2007 21:01
		Re: Box-Whisker plots in IDL By: Marshall Perrin on Mon, 20 August 2007 17:37
		Re: Box-Whisker plots in IDL By: jschwab@gmail.com on Mon, 20 August 2007 17:06
		Re: Box-Whisker plots in IDL By: David Fanning on Mon, 20 August 2007 16:47
		Re: Box-Whisker plots in IDL By: jschwab@gmail.com on Mon, 20 August 2007 16:04
		Re: Box-Whisker plots in IDL By: teich on Mon, 20 August 2007 14:03
		Re: Box-Whisker plots in IDL By: David Fanning on Mon, 20 August 2007 13:56
		Re: Box-Whisker plots in IDL By: teich on Mon, 20 August 2007 13:22
		Re: Box-Whisker plots in IDL By: David Fanning on Mon, 20 August 2007 12:40
		Re: Box-Whisker plots in IDL By: teich on Mon, 20 August 2007 12:18
		Re: Box-Whisker plots in IDL By: Brian Larsen on Mon, 20 August 2007 12:01
		Re: Box-Whisker plots in IDL By: teich on Mon, 20 August 2007 10:27
		Re: Box-Whisker plots in IDL By: David Fanning on Mon, 20 August 2007 10:10
		Re: Box-Whisker plots in IDL By: mankoff on Mon, 20 August 2007 10:04
		Re: Box-Whisker plots in IDL By: JD Smith on Sun, 26 August 2007 18:50
		Re: Box-Whisker plots in IDL By: jschwab@gmail.com on Mon, 20 August 2007 21:46

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