Thread: How to state an improvement in errors (2000)

1. How to state an improvement in errors (2000)

Although this isn't actually an Access question, it's one that I have while using Access. I realized that I'm not sure how to state an improvement in an error rate. For example:

First, I produce 100 units, with 25 errors for an Error Rate of 25%.

Later, I produce 100 units, with 10 errors, for an Error Rate of 10%.

Did I improve my errors by 15%, or by 60%?

Units 100 100
Errors 25 10
Error Rate 25% 10%

Begin Error Rate 25%
End Error Rate 10%
Improvement 15%

Begin errors 25
Ending errors 10
Improvement in errors 15
Improvement 60%

Thanks for any perspective on this.

Howard

2. Re: How to state an improvement in errors (2000)

Thanks for your input Cecilia. I guess that's why they say that statistics can be misleading if the one providing them wants them to be.

Howard

3. Re: How to state an improvement in errors (2000)

I think that if your errors had gone from 10 to 20 the management would insist that they had doubled (100%) not just had a 10% increase! so you are only using the same maths as them!! <img src=/S/smile.gif border=0 alt=smile width=15 height=15>

peter

4. Re: How to state an improvement in errors (2000)

Hee hee, Peter!

That's exactly how my management sees it!

(Call me poor gov't employee)

5. Re: How to state an improvement in errors (2000)

Isn't the accepted formula: Last - First / Last = rate of change?

That would mean, in your example, 25-10/25 is a 60% improvement in error rate.

But you did improve your errors/performance (rather than your rate of errors) by 15%.

I'm not an expert in statistics, but this is how I'd interpret it.

For 2