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Full Discussion: Median and max of duplicate rows
Top Forums Shell Programming and Scripting Median and max of duplicate rows Post 302838977 by ritakadm on Wednesday 31st of July 2013 03:29:02 AM
Old 07-31-2013
Median and max of duplicate rows
Hi all,

plz help me with this, I want to to extract the duplicate rows (column 1) in a file which at least repeat 4 times. then I want to summarize them by getting the max , mean, median and min. The file is sorted by column 1, all the repeated rows appear together.

If number of elements is odd, median is middle one , eg 4th element among 7 sorted numbers ... element number (n+1)/2
If number of elements is even, it is the average of middle 2, eg. average of 4th and 5th element for set of 8 sorted numbers...average of n/2 + 1 and n/2

Code:
Inp

R1 1
R1 2
R1 3
R2 1
R2 2
R2 3
R2 100
R3 5


output

R2 100 26.25 2.5 1

I figured our uniq -d option will give me the duplicate lines, but how do I work with at least 4?


Also, I tried to find the mean and median, getting errors but trying to get this to work.


Code:
sort -n file | awk ' { a[i++]=$2;  N[$1]++}
    END { for (key in i) {
                        avg = sum[key] / N[key];}
x=int((i+1)/2); 
if (x < (i+1)/2)
 print (a[x-1]+a[x])/2 " " avg; 
else print a[x-1] " " avg; }'

 

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LEARN ABOUT DEBIAN

numaverage

NUMAVERAGE(1)						User Contributed Perl Documentation					     NUMAVERAGE(1)

NAME

       numaverage - Find the average of a set of numbers.

SYNOPSIS

       numaverage [-dhiIlmMV] <FILE>

       | numaverage [-dhiIlmMV]    (Input on STDIN from pipeline.)

       numaverage [-dhiIlmMV]	   (Input on STDIN.  Use Ctrl-D to stop.)

DESCRIPTION

       By default numaverage will determine the average from all numbers on input.  Other options allow you to find the mode and median.

OPTIONS

	   -i  Only return the integer portion of the final sum.
	   -I  Only return the decimal portion of the final sum

	   -m  Find the mode (most occuring) of the list of numbers,
	       or when there's more than one mode, the first completed mode.
	   -M  Find the median (middle number) of the list of numbers.
	   -l  When finding the median and the count of numbers in the set is even,
	       use the lower middle number instead of the upper middle number.

	   -h  Help: You're looking at it.
	   -V  Increase verbosity.
	   -d  Debug mode.  For developers

SEE ALSO

       numbound(1), numinterval(1), numnormalize(1), numgrep(1), numprocess(1), numsum(1), numrandom(1), numrange(1), numround(1)

COPYRIGHT

       numaverage is part of the num-utils package, which is copyrighted by Suso Banderas and released under the GPL license.  Please read the
       COPYING and LICENSE files that came with the num-utils package

	 Developers can read the GOALS file and contact me about providing
       submitions or help for the project.

MORE INFO

       More info on numaverage can be found at:

       http://suso.suso.org/programs/num-utils/

perl v5.10.1							    2009-10-31							     NUMAVERAGE(1)
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