what is the r code that identifies a vector with only two ordered levels can you use pearson correlation on two vectors? what is the r code for a vector with only a two ordered level what method should be used to find correlations is spearman normal for two vectors what is normal correlation for vectors what is the pearson correlation what is the standard method to use as an example in r? what is the standard correlation what is the correlation between vectors if there is only 2 or 3 levels how to use spearman correlation in r can you use spearman can you use regular and pearson correlation what type of correlation can you use how many levels are needed for spearman correlation to be correct? what type of normal correlation how to find normal correlation what is the normal correlation what does spearman mean in math can you use spearman