With these, we estimate models with a latent variable that describes perceived safety and latent classes.
Tip-to-apex distance (TAD) is a scale variable that describes cumulative distance on AP and lateral radiographs, corrected for magnification, of the screw from the apex of the head.
Many liquid-phase chemical reactions involve the electron-transfer steps, and a key thermodynamic variable that describes the tendency of chemical species in solution to gain or lose electrons is the redox potential.
Among women with all three serum cotinine and meconium measurements, we further quantified cumulative exposure to prenatal tobacco smoke by creating a summary variable that described the number of prenatal serum measurements that a woman was exposed to secondhand or active tobacco smoke.
(3) SD: this variable was a structured variable that described the configuration of the probe (source-detector) geometry.
Cumulative exposure was treated as a time-varying explanatory variable that described the benzene exposures accrued prior to a person's entry into a risk set in the Cox regression analysis.
If the model lacks variables describing the existing selection process estimates of the parameters will be biased (or alternatively speaking, affected by omitted variables that describes selection process).
The advantage of the present study is the prospective follow-up of an age-homogeneous group of both patients and healthy control individuals of both sexes and the testing of a range of variables that describe the quantity, remodelling and regulation of bone mass.
The derived new uncorrelated variables that are linear combinations of the original one result in finding of a smaller group of underlying variables that describe the data.
