Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2018 May 17;71(3):182–191. doi: 10.4097/kja.d.18.00067

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © The Korean Society of Anesthesiologists, 2018

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Fig. 6. — Log-log function curves for the antiemetic comparison experiment. The Y-axis represents the log-log transformed survival function estimated using the Cox proportional hazards regression model. The basic assumption of Cox proportional hazards regression modeling, a constant hazard ratio over the time (the proportional hazards assumption), can be checked using this plot for only one covariate, the antiemetic. The two curves do not cross over in the early period of observation and remain parallel after that. This plot suggests that this model does not violate the proportional hazards assumption (Created with: IBM^® SPSS^® Statistics ver. 23 [IBM Corp., USA]).