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Thank you for your post! I want to clarify the interval and ratio level of measurements.

Feedback and Question: In statistics, measurements having starting points are classified as ratio levels of measurement.

Do you know if blood pressure readings are measured starting from zero and cannot go below zero, with zero being the baseline? I recommend watching this YouTube video to learn about the types of data and levels of measurement. I'd love to hear your thoughts after watching it. Thank you.

https://www.youtube.com/watch?v=LPHYPXBK_ks