Looking for a way to measure the efficiency of software testing I came upon the following formula
Testing Efficiency = (No. of defects Resolved / Total No. of Defects Submitted)* 100
from e.g. here.
But this does not look like a measure for testing efficiency, but more for resolving the found defects. Finding the defects is one thing, to fix them is not a testers responsibility. So how can it be a 'Testing efficiency', in what sense?
Also, what does the actual number say? 0% means none of the defects have been resolved, 100% means all of the defects have been resolved. What does a number of '80%' signify? Is it just a number reflecting the current state of a software release to see that 80% of the defects have been fixed? Can I see more from that number? Does the time-distribution tell me something with more insights?