From: Diabetes screening intervals based on risk stratification
Random effect model: | Y ij = U ij + ε ij |
Observed HbA1c: | Y ij |
Noise: | ε ij |
Signal: | U ij = α ij + β ij * T |
α i ~ N(α,σ a 2) , β i ~ N(β,σ b 2), with covariance (αi ,β i ) = σ ab ε ij ~ N(0,σ w 2) |