In the population regression function, the regression coefficients Bs are random variables. On the other hand, the regression coefficients, b 1 and b 2 in the SRF are papameters.

Motivated by quantifying the monotonic relationship between gray matter (GM) volume and age in the older population, this study proposes a constrained nonparametric estimation and statistical ...

NCF, assessed by tests of memory, executive function, and fine motor coordination, was correlated to magnetic resonance imaging–measured BM volume. NCF and survival were compared in 135 patients ...