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1. ## Cumulative bug rate

I'm curious: how do you figure out the cumulative bug rate? I'm looking at this idea for functional testing. And I want to graph things out better. But I've read how it's best to use a cumulative rate of bugs but I'm not sure how to calculate that.

2. ## Re: Cumulative bug rate

I am not sure if it is the same thing, but the one book I have on software metrics (Software Metrics: Establishing a Company-Wide Program by Grady and Caswell) describes "average defect rates". It has examples where they graph the number of defects discovered each week, and concurrently graph a 3 week average of defects to help show the overall trend.

</font><blockquote><font size="1" face="Verdana, Arial, Helvetica">code:</font><hr /><pre style="font-size:x-small; font-family: monospace;">100 + - : weekly count
| = : 3 week average
80 +
|
60 +
| -
40 + - = -
| - = -= = =
20 + - - = -=
| - -=
0 +--+--+--+--+--+--+--+--+--+--+--+-
week: 1 2 3 4 5 6 7 8 9 10 11</pre><hr /></blockquote><font size="2" face="Verdana, Arial, Helvetica">(In the actual example, the "-" and "=" symbols are vertices of the trend lines which were actually shown.)

3. ## Re: Cumulative bug rate

Interesting Charles. Thank you. I will look at that example more closely. The book I was reading was Software Testing by Ron Patton. It talks about these things but doesn't explain the calculation. Sounds like it is just some distribution of bugs based on some time value, and you can choose whatever time value you want. So I could take each week and take average of bugs per day as one number. Do that for a couple of weeks and use just the averages and I've got a cumulative figure.

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