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hello this is dr. grande welcome to my video and calculating percentage change using Microsoft Excel occasionally in counseling research who want to calculate the percentage change between two sets of scores so I have here in an Excel worksheet fictitious data I have a pretest variable it has 17 scores and a post-test variable that contains 17 scores letamp;#39;s assume these it came from a substance use treatment facility and that these data points represent the number of times a participant used alcohol in a month so this would be a pretest so this would be the number of times alcohol was consumed in one month and then to be a treatment and then the other post-test it had a number of times the alcohol was consumed in the next month now clearly you would have to operationalize that variable meaning what counts as consuming alcohol but however itamp;#39;s operationalized we know that the value has to be either zero or greater than zero there cannot be a negative number of times that