SAM-STATS(1)

NAME
sam-stats - ea-utils: produce digested statistics

SYNOPSIS
sam-stats [options] [file1] [file2...filen]

DESCRIPTION
Version: 1.38.681

Produces lots of easily digested statistics for the files listed

Options (default in parens):

-D Keep track of multiple alignments -O PREFIX Output prefix enabling extended output (see below) -R FIL Coverage/RNA output (coverage, 3' bias, etc, implies -A) -A Report all chr sigs, even if there are more than 1000 -b INT Number of reads to sample for per-base stats (1M) -S INT Size of ascii-signature (30) -x FIL File extension for handling multiple files (stats) -M Only overwrite if newer (requires -x, or multiple files) -B Input is bam, don't bother looking at magic -z Don't fail when zero entries in sam

OUTPUT:

If one file is specified, then the output is to standard out. If multiple files are specified, or if the -x option is supplied, the output file is <filename>.<ext>. Default extension is 'stats'.

Complete Stats:

<STATS>
    : mean, max, stdev, median, Q1 (25 percentile), Q3

reads
    : # of entries in the sam file, might not be # reads

phred
    : phred scale used

bsize
    : # reads used for qual stats

mapped reads
    : number of aligned reads (unique probe id sequences)

mapped bases
    : total of the lengths of the aligned reads

forward
    : number of forward-aligned reads

reverse
    : number of reverse-aligned reads

snp rate
    : mismatched bases / total bases (snv rate)

ins rate
    : insert bases / total bases

del rate
    : deleted bases / total bases

pct mismatch
    : percent of reads that have mismatches

pct align
    : percent of reads that aligned

len <STATS>
    : read length stats, ignored if fixed-length

mapq <STATS>
    : stats for mapping qualities

insert <STATS>
    : stats for insert sizes

%<CHR>
    : percentage of mapped bases per chr, followed by a signature

  Subsampled stats (1M reads max):

    base qual <STATS> : stats for base qualities %A,%T,%C,%G : base percentages

  Meaning of the per-chromosome signature:

    A ascii-histogram of mapped reads by chromosome position. It is only output if the original SAM/BAM has a header. The values are the log2 of the # of mapped reads at each position + ascii '0'.

  Extended output mode produces a set of files:

.stats
    : primary output

.fastx
    : fastx-toolkit compatible output

.rcov
    : per-reference counts & coverage

.xdist
    : mismatch distribution

.ldist
    : length distribution (if applicable)

.mqdist
    : mapping quality distribution