i need some help with statistical anylsis of biological properties. Assume, that for some biological properties A, B, C and D, we have their occurence given as m/n-ratios. We have these data for three example species S1 to S3 in a table like shown below (My real data set contains 14 properties for over 100 species):
As seen above, in some cases no data is available (denoted as NA), so my question now is how to define the quartiles Q1 and Q3 and the Median Q2 for a certain property? Can somebody explain to me how to handle this for property A? Unfortunately i never encountered this case with non-available data.