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# Subtracting z scores

Thu 6 Oct, 2022 10:04 pm
If I have a z score for a data set, and I later add more data to it and get a new z score, how would I figure out the z score of just the new data from the old z score and the expanded one. Can I subtract it out somehow?
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engineer

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Fri 7 Oct, 2022 05:54 am
@Steve-the-conquered,
If by z score, you mean standard deviation, then yes, you can, but you will need to know the number of samples in each population and the mean of each population. If you know the mean of the original population and the mean of the final population, you can get the mean of the new population, but you need the number of samples in each group.
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