You’re right. I have spelt ‘rash’ wrongly and yes, there are many very very bad puns which can come from this title.
But you may have seen, occasionally, Rasch analysis as a thing on scientific paper and wondered ‘Why have they spelled rash wrong?’
Rasch analysis is a way of creating a properly scaled measurement from an interval scale (as in Likert scales).
The scale may look like:
But when people fill it in, the difference between 1 & 2 is different than 3&4 (that is, it’s more different to a person to be say ‘I’m feeling 4 not 3’ – the sad side of half-way – than to say ‘I’m feeling 2 not 1’ but still in the happy zone).
The Rasch analysis mathematically corrects the distances between the numbers, like making the ruler rubbery.