The function calculates median values for SLA, Height, and SeedMass from the input data.
It then determines the LHS strategy for each species based on whether its trait values are
less than or equal to (S) or greater than (L) the median values.
The resulting strategy is a combination of three letters (S or L) representing Leaf (SLA),
Height, and Seed (SeedMass) respectively, separated by hyphens.