Hi, I was trying a principal component analysis and I'd like to get some help
First, here is a table that shows measured concentrations of dopamine (DA), 3,4-hydroxyphenylacetic acid (DOPAC), and homovanillic acid (HVA) in mice urine after 2 hours of brain electric stimulus. The stimulus intensity were control in 3 mice, 100 μA in 4 mice, and 200 μA in 4 mice.
Using pca function, How can I interpret that which hormone is the most significant?
Also, I'd like to draw a scatter plot in different colors in each group (control, 100, 200)?