![]() So even if we used the same units, it is recommended to also standardize the variables. Of course in this case one can argue that the variables should have the same unit but not be standardized, which may be a valid argument, were it not that we are measuring two different things (the height and the diameter). Both will lead to a more balanced picture of the variability. We could use the same units, or we could standardize the variables by dividing by their standard deviations. We see that the variance of the girth variable is several orders of magnitude larger than that of the height (again, because of the different units) and this is reflected in the PCA. ![]()
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March 2023
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