how are pca performed why does two different data sets use different pca why does pca differ from two similar data sets pca definition in data what is the correct amount of pca in comparison to two different data sets why two data sets are similar why is the pca performed on two similar data sets what is the correct number of parts to pca how many different types of spectra are required for pca analysis how many components to use pca what type of pca is used on two similar data sets what is the difference between a pca and a comparable data set why do pca calculations differ how does pca differ why can you get two similar data sets what is the difference between a similar data set and a pca why is the pca performed in two similar data sets different why two identical data sets are performed with two different lasers? why does a different pca result in different number of components? which of the following results in a different number of components?