Figure 3.
(a–b) Cocaine prediction curves for two sample field days. (c–d) Histogram features that represent cocaine use for the same two sample field days.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.