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package Text::NumericData::Stat; |
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# TODO: Integrate into Text::NumericData::File already. |
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# Also, return something for single data sets; just set non-computable measures to soemthing invalid. |
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use Text::NumericData::File; |
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use strict; |
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# This is just a placeholder because of a past build system bug. |
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# The one and only version for Text::NumericData is kept in |
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# the Text::NumericData module itself. |
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our $VERSION = '1'; |
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$VERSION = eval $VERSION; |
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# Generate a statistics file out of given input file. |
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# Gives and takes Text::NumericData::File objects. |
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# This could be a method of Text::NumericData::File, but it doesn't have to. |
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sub generate |
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{ |
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my $in = shift; |
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my $out = Text::NumericData::File->new($in->{config}); |
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my @mean; # arithmetic mean |
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my @error; # standard error, sqrt(mean sq. error / N-1) |
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my $N = @{$in->{data}}; |
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return $out if $N < 2; |
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my $S = @{$in->{data}[0]}; |
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for my $d (@{$in->{data}}) |
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{ |
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for my $i (0 .. $S-1) |
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{ |
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$mean[$i] += $d->[$i]; |
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} |
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} |
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for my $i (0 .. $S-1) |
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{ |
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$mean[$i] /= $N; |
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} |
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for my $d (@{$in->{data}}) |
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{ |
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for my $i (0 .. $S-1) |
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{ |
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$error[$i] += ($d->[$i]-$mean[$i])**2; |
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} |
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} |
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for my $i (0 .. $S-1) |
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{ |
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$error[$i] = sqrt($error[$i]/($N-1)); |
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} |
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$out->{title} = 'Statistics'; |
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$out->{title} .= ' of '.$in->{title} if defined $in->{title}; |
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$out->{titles} = ['column', 'name', 'mean', 'stderr']; |
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for my $s (1 .. $S) |
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{ |
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my $name = $in->{titles}[$s-1]; |
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if(defined $name) |
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{ |
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$out->filter_text($name); # play safe since there is no quoting in data (yet?) |
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} |
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else |
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{ |
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$name = "col$s"; |
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} |
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$out->{data}[$s-1] = [ $s, $name, $mean[$s-1], $error[$s-1] ]; |
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} |
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return $out; |
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} |
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1; |
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__END__ |