[BiO BB] Mean and Standard deviation

Tue Feb 21 11:57:39 EST 2006

SD calculations involve the sample size as one of the variables.  This is likely what is causing the change in SD, since you are reducing the the sample size when you remove the two sets of endpoints.


-----Original Message-----
From: bio_bulletin_board-bounces+christopher_frenz=nymc.edu at bioinformatics.org on behalf of Subhash Agarwal
Sent: Tue 2/21/2006 12:03 AM
To: bioinformatics.org
Subject: [BiO BB] Mean and Standard deviation
Dear Forum Memebers
  I have a dataset with 394 data points. The frequecy distribution of which is as follows:
                0-0.02  85    0.02-0.04  63    0.04-0.06  51    0.06-0.08  39    0.08-0.1  36    0.10-0.12  24    -0.12-0.14  21    0.14-0.16  19    0.16-0.18  13    0.18-0.2  10            >0.20            33
  The mean and SD of the data is 0.0842 and 0.0853. But when the data points from 0-0.02 and > 0.2 are removed and the mean and SD is calculated it is found that mean doesnt change much (0.0819) but SD does (0.0472). My query is what can I interpret from this regarding the data.
  If any of the forum members feels that this question should be addressed to some other place do let me know.

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