Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Calculating the Standard Deviation for a column Post 302317316 by jim mcnamara on Monday 18th of May 2009 04:58:21 PM
Old 05-18-2009
try this:
Code:
awk '{ lines=FNR; arr[lines]=$3; sum+=$3}
     END{ avg=sum/lines
     sum=0;
     for(i=1; i<=lines; i++)
      	{ v=arr[i]-avg;
      	  sum+= v*v
      	}
     printf("n=%d avg=%f  stddev=%f\n",
            lines, avg, sqrt( sum/( lines - 1) ) ) } ' filename

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script for finding standard deviation

I have a CSV file that looks like 0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0 10,11,7,0,4,12,2,3,7,0,11,3,12,4,0,5,5,4,5,0,8,6,12,0,9,3,3,0,2,7,8 19,11,7,0,4,14,16,10,8,2,13,7,15,6,0,76,6,4,10,0,18,10,17,1,11,3,3,0,9,9,8... (7 Replies)
Discussion started by: RJ17
7 Replies

2. Shell Programming and Scripting

Mean and Standard deviation

Hi all, I am new to shell scripting and wanna calculate the mean and standard deviation using shell programming. I have a file with letters that are repeating and their corresponding duration a 0.32 a 0.89 aa 0.34 aa 0.23 au 0.012 au 0.26... (4 Replies)
Discussion started by: lakshmikanth.pg
4 Replies

3. Shell Programming and Scripting

using awk to print average and standard deviation into a file

Hi I want to use awk to print avg and st deviation but it does not go into a file for column 1 only. I can do average and # of records but i cannot get st deviation. awk '{sum+=$1} END { print "Average = ",sum/NR}' thanks (1 Reply)
Discussion started by: phil_heath
1 Replies

4. Shell Programming and Scripting

Standard deviation in awk

Hi all, I need to find the standard deviation of each column of a dataset below for each hour. The data is given in 5 second intervals as shown below DATE TIME FRAC_DAYS_SINCE_JAN1 FRAC_HRS_SINCE_JAN1 EPOCH_TIME ... (11 Replies)
Discussion started by: gd9629
11 Replies

5. Shell Programming and Scripting

AWK script for standard deviation / root mean square deviation

I have a file with say 50 columns, each containing a whole lot of data. Each column contains data from a separate simulation, but each simulation is related to the data in the last (REFERENCE) column $50 I need to calculate the RMS deviation for each data line, i.e. column 1 relative to... (12 Replies)
Discussion started by: chrisjorg
12 Replies

6. Shell Programming and Scripting

Finding standard deviation for all columns in a data file

Hi All, I want someone to modify the below script from this forum so that it can be used for all columns in the file( instead of only printing column 3 mean and standard deviation values). I don't know how to loop around all the columns. ... (3 Replies)
Discussion started by: ks_reddy
3 Replies

7. UNIX for Dummies Questions & Answers

Standard deviation of one column when another column has the same value

Hey guys, I am currently learning different bioinformatics applications, but I do not have all that much of a computer science background. Anyway, I have been asked to perform the mean and standard deviation of coverage for different transcript ID numbers. This involves a huge file with about 30... (1 Reply)
Discussion started by: subtlegrace92
1 Replies

8. Shell Programming and Scripting

calculating row-wise standard deviation using awk

Hi, I have a file containing 100,000 rows-by-120 columns and I need to compute for the standard deviation for each row. Any idea on how to calculate row-wise standard deviation using awk? My sample data looks like this: input data: 23 35 12 25 16 17 18 19 29 12 12 26 15 14 15 23 12 12... (2 Replies)
Discussion started by: ida1215
2 Replies

9. Shell Programming and Scripting

Output mean and standard deviation of a row

I have a file that looks that this: 820 890 530 1650 1600 1800 1850 1900 2270 1640 2300 1670 2080 2200 2350 1150 1630 2210 I would like to output the mean and standard deviation of each row so that my final output would look like this 820 890 530 746.667 155.849 1650 1600 1800... (5 Replies)
Discussion started by: kayak
5 Replies

10. Shell Programming and Scripting

SMA (Single Moving Average) and Standard Deviation

Hello Team, I am using the following awk script to calculate the SMA (Single Moving Average) for an specific period but now I would like to include the standard deviation output. Could you please help me to modify this awk shell script awk -F, -v points=5 ' { a = $2; ... (4 Replies)
Discussion started by: csierra
4 Replies
SUM(1)								   User Commands							    SUM(1)

NAME
sum - checksum and count the blocks in a file SYNOPSIS
sum [OPTION]... [FILE]... DESCRIPTION
Print checksum and block counts for each FILE. -r use BSD sum algorithm, use 1K blocks -s, --sysv use System V sum algorithm, use 512 bytes blocks --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. AUTHOR
Written by Kayvan Aghaiepour and David MacKenzie. REPORTING BUGS
Report sum bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for sum is maintained as a Texinfo manual. If the info and sum programs are properly installed at your site, the command info coreutils 'sum invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 SUM(1)
All times are GMT -4. The time now is 10:28 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy