box and percentile question

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Mon, 09/28/2015 - 03:23 pm

Hi everybody, does anyone know if the percentile panel included in Igor take NaNs in waves into consideration when calculating the percentiles? Or the procedure remove the NaNs by itself? i.e. I don't know if waves should be cleaned to include no NaNs for this panel.

Thank you!
Well, I wrote that but couldn't remember... but a look at the code indicates that it looks for NaNs and compensates for them. Should be easy enough to test by experiment...

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

September 28, 2015 at 03:37 pm - Permalink

Thank you johnweeks! I did a test a one wave and manually created some NaNs in the wave, the panel gave me back different results so I suppose there is a difference in here? I have one more question though, how should I find the procedures for this panel? Or what would be the correct way to locate procedures that are integrated in the software and the menus? Plus, what does the suffix _EB stand for in the output from the percentile procedure? Thank you very much!

September 29, 2015 at 06:17 pm - Permalink

Are you comparing a set of waves without NaNs to a set of waves where some data points have been replaced with NaNs? If so, then the result must be different- the NaN points are simply left out; that is, if you have 5 waves and a NaN in a row of one of the waves, then the percentiles for the row with a NaN in it will be based on 4 values, not 5.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

September 30, 2015 at 12:48 pm - Permalink

mwpro wrote:
I have one more question though, how should I find the procedures for this panel? Or what would be the correct way to locate procedures that are integrated in the software and the menus?

Windows->Procedure Windows will give you a menu of the procedures. Some WaveMetrics procedures are implemented a Independent Modules, which are hidden by default, but Percentile and Box Plot.ipf is not one of those.
Quote:
Plus, what does the suffix _EB stand for in the output from the percentile procedure?

When you make a box plot, the boxes are implemented as error bars. Those are the waves that define the error bar boxes.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

September 30, 2015 at 12:56 pm - Permalink

Thank you johnweeks! Creating NaNs does make it a different wave, so they will have different percentiles, and now I understand that I don't need to remove any NaNs from the target wave since the inherent procedure does it for you. Thanks again!

October 2, 2015 at 11:37 am - Permalink