| PDM | point distribution model |
|---|---|
| PRECEDE | predisposing, reinforcing, and enabling causes in educational diagnosis and evaluation [model] |
| PROC | GLM general linear model procedure |
| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
| RCM | radial contour model; radiographic contrast medium; red cell mass; reinforced clostridial medium; re... |