Percent Change from Baseline

[ceperras]

Good Morning,
Let's say I am looking at number of sneezes over a course of a month and I want to calculate the Percent Change from Baseline in Sneezes per Week.

My first idea would be to do so using the following formula:
1-(Change in Sneezes per Week/Number of Sneezes per Week at Baseline)*100

However, is someone had 0 sneezes at their baseline week, then this formula does not work.

What should I do?

Thank You!!
:wave:

[mp83]

However, is someone had 0 sneezes at their baseline week, then this formula does not work.

Hi! You can always add a constant to all your observations (say .5) and then you can have a proportion differ than 0