I still have a number of question about how to best measure typing speed and accuracy, but I have settled on one thing:
In the digital environment, where you don’t have to take LOTS of time to go back and make corrections on a hard copy, I think speed should not be adjusted with errors you make, but you correct on the fly. For example, I just did a test on a site where they only count your final result. So if you make an error and correct it, it doesn’t count as an error and doesn’t subtract from your speed.
I completely agree it shouldn’t count against your speed. Obviously, you lose some speed with the time it takes to make the corrections. That is appropriate. Why, if I correct 3 errors and come out with 70 wpm, should I be considered worse than a person who types 65 wpm and never had to correct a mistake? The net result still makes me overall faster. In a typewriter world, this would be different, but this isn’t a typewriter world!
Now, if calculating error rate, it gets more complicated. Should corrected errors count? Or not. I’m not so sure about this one. And any errors, do you count every wrong character as a percentage of all characters? Or just every wrong word, no matter how many errors are in in, as a percentage of all words? Those are things I am unsure about.