Giving Feedback to VAS-Rating (correct number stored in excel-file)

[Michelle_S]

Hi everyone!
I’m trying to create an experiment where participants see a fraction and need to locate it on a visual analogue scale from 0 to 1.

I defined my conditions (my fractions) in an excel-file. I also want to give participants feedback on their rating. So far i tried this code and stored the possible numbers in the excel-file. It works but not ideal !

My Code:
in Stim - each Frame
if rating.getRating() == CorrectAns or rating.getRating() == CorrectAns1 or rating.getRating() == CorrectAns2:
rating.corr = 1
else:
rating.corr = 0

In feedback select begin experiment:
nRespCorr = 0
nRespIncorr = 0

Begin Routine
if rating.corr == 1:
nRepsCorr = 1
nRepsIncorr = 0
else:
nRepsCorr = 0
nRepsIncorr = 1

Is it possible to give a range rather than a specific number? Since it’s hard to get the exact possible ratings from the VAS this would be a much more precise way to tell the participant how exact their rating was.

Thank You so much for any suggestions!

[TParsons]

You could try using the builtin Python function range in your if statements, something like:

if rating.getRating() in range(CorrectAns-5, CorrectAns+5):

meaning it would check whether the rating was within 5 of the correct answer in either direction

[Michelle_S]

Thank You so much for your help. This is exactly what i needed, however i keep getting this error message:

if rating.getRating() in range(CorrectAns-0.1, CorrectAns+0.1):
TypeError: ‘numpy.float64’ object cannot be interpreted as an integer

Experiment ended.

Do you know a way to fix this? Thank you!

[TParsons]

Ah, that’ll be because either CorrectAns or rating.getRating() is a numpy.float64 object and not a number. To get the value itself, just add .item() to the end, e.g. CorrectAns.item(), as this is the command for numpy objects which extracts their numeric value.

[Michelle_S]

@TParsons

numpy.float64

I’ve added the .item() to it but it still won’t work? CorrectAns in my Excel sheet is 0.1

[TParsons]

Ah okay, it looks like range doesn’t work with non-integer values…

In that case your best option is probably:

if (rating.getRating()  >= CorrectAns-0.1) and (rating.getRating() <= CorrectAns+0.1):