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#!/usr/bin/perl

...
2014-04-05 60      22
2014-04-06 63      25
2014-04-07 52      24

#!/usr/bin/gnuplot

...
plot 'test.dat' using 1:2 title 'Promises not kept' with boxes lc rgb 
+"orange", \
p(x) title 'Promise Trend' with lines linestyle 1, \
h(x) title 'Host Trend' with lines linestyle 2

# date     notkept hosts
2014-04-01 50      10
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2014-04-05 60      22
2014-04-06 63      25
2014-04-07 52      24

$VAR1 = [
          1399003199,
...
          'y2' => 120,
          'x1' => 0
        };

Final set of parameters            Asymptotic Standard Error
=======================            ==========================
...
               m1     b1
m1              1.000
b1             -1.000  1.000