No, he threw away data from people who put under £100 in a daily rate and didn't explicitly state it was an hourly rate. He threw away ambiguous data, yes it sucks data was lost but it means better "integrity" of the final results.
Don't you find it a bit suspicious that after throwing away all those numbers, he was left with nobody at all billing more than £75/hr?
And realistically, is there anybody here in the UK who is not a builder's apprentice and charges less than £100 per day? Think there are any computer programmers billing out at £12/hr here?
I don't think the data was in any way ambiguous. And since he threw it out, he pretty much invalidated his survey.
Data between $100 to $200 could be ambiguous too. I think there's no way to save the integrity of the final results. It'd still have been nice to see a graph though.
