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Introduction to StatsToDo Navigating the Site
This is the home page of the Statistics Toolkit (StatsToDo) website, a mirror site of StatTools from the Department of Obstetrics and Gynaecology, the Chinese University of Hong Kong.

The content provided on StatsToDo is produced by Allan Chang, Professor Emeritus of the Department of Obstetrics and Gynaecology of the Chinese University of Hong Kong. The site has been available since the mid-1990s as a resource for other researcher conducting clinical studies, performing quality control and reviewing data. The statistical content provided is intended as a supplement and not a replacement for formal lectures on statistical theory and data analysis.

Every effort has been made to compare reported results with those reported by standard statistical software such as SPSS, MEDCalc and STATA to ensure that they are accurate and reliable. However, errors and omissions may still exist, and users should assure themselves that the contents and advise provided are correct before accepting them.


The author and his colleagues, as well as any institution associated with the site, reserves the right to amend, update and delete any information of the website without prior notice. They accepts no liability for any loss, change or damage howsoever arising from any use or misuse of or reliance on any information in this website.