Journal of Probability and Statistics / 2012 / Article / Fig 1

Research Article

Mixed-Effects Tobit Joint Models for Longitudinal Data with Skewness, Detection Limits, and Measurement Errors

Figure 1

The histograms (a,b) of viral load measured from RNA levels (in natural l n scale) and standardized CD4 cell count in plasma for 44 patients in an AIDS clinical trial study. Profiles (c,d) of viral load (response) in l n scale and CD4 cell count (covariate) for three randomly selected patients. The vertical and horizontal lines in (a) and (c) are below the detectable level of viral load ( 3 . 9 1 = l n ( 5 0 ) ).
614102.fig.001a
(a) Histogram of viral load in ln scale
614102.fig.001b
(b) Profiles of viral load in ln scale
614102.fig.001c
(c) Profiles of CD4 cell count
614102.fig.001d
(d) Histogram of CD4 cell count

We are committed to sharing findings related to COVID-19 as quickly and safely as possible. Any author submitting a COVID-19 paper should notify us at help@hindawi.com to ensure their research is fast-tracked and made available on a preprint server as soon as possible. We will be providing unlimited waivers of publication charges for accepted articles related to COVID-19. Sign up here as a reviewer to help fast-track new submissions.