Internal helper that computes EZ diffusion model parameters for each
condition in a drift_dm_obj. The computation is based on the equations
from Wagenmakers et al. (2007) and estimates drift rate (muc), boundary
separation (b), and non-decision time (non_dec).
get_ez_diffusion(drift_dm_obj)a matrix with rows muc, b, and non_dec
a drift diffusion model object containing observed data
in obs_data, including upper (rts_u) and lower (rts_l) response times
per condition
If Pc equals 0, 0.5, or 1, small adjustments are applied to prevent
numerical issues in the logit transformation.