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To calculate percent change the formula is: $\frac{Amount \,of\,changes}{Original\, amount}100=\frac{New-Old}{Old}100$

because we want to see how it changes compared to where it was before, now if there is no changes the percent changes must be zero. I am a student in neuroscience field, we always measure biophysical signals change (in our field we call it normalized signals), but these signals are always start from 1.

Is normalized value and the percent change are the same, and why start from 1 and not 0?

user137684
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    It may help if you define what "biophysical signals change" is so that one could try to derive a meaning for the value "1" being a minimum value. What would be the max. value? – NoChance Aug 03 '19 at 18:39
  • biophysical signals: like the signal that define the amount of blood in cerebral area. – user137684 Aug 03 '19 at 18:54
  • It makes sense to assume that this can't be zero, however, the "normalization process" probably does not just ad the value "1", it is possible based on a statistical formula. Check this if relevant: https://books.google.com.eg/books?id=U7X6nDAtA-MC&pg=PA346&lpg=PA346&dq=normalized+biophysical+signals+change&source=bl&ots=bXZLho_Sjp&sig=ACfU3U1_itVJGY6tAS2avcYpzOyKfDTq-g&hl=en&sa=X&ved=2ahUKEwjx98vct-jjAhXSzIUKHYPSBe8Q6AEwA3oECAkQAQ#v=onepage&q=normalized%20biophysical%20signals%20change&f=false – NoChance Aug 04 '19 at 05:00

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