Analysis of 2x2 Tables
Oct 25, 2017 10:00 AM
End: Oct 25, 2017 04:30 PM
25th Oct, 2017: This workshop aims to demystify the range of statistics that can be used to summarise the associations between two binary variables. We move on from the standard chi-square test to investigate other options that may yield more useful information.
When data is collected from 2 binary variables on the same individuals or items, the data may be displayed as a 2 by 2 table. It is often of interest to determine whether there is some form of association between the two variables in the table, for example, comparing the % who test positive between two treatment groups, or between 2 subgroups such as males and females. The chi-square test is most commonly used by researchers to compare the percentage of individuals in two groups who share a trait.
However, there are many other statistics that may be applied to a 2x2 table to provide more useful information and this course aims to help guide the researcher through alternative analyses to decide on the most appropriate investigation of their data.
The following tests and concepts are covered in the course:
- Fishers exact testing
- Absolute Risk Reduction (ARR)
- Proportions tests
- Number needed to treat (NNT)
- Relative risk (RR)
- Attributable risk (AR)
- Odds ratio (OR)
- Sensitivity and specificity
- Positive and negative predictive values
- Likelihood ratios
For each statistic we consider the interpretation and appropriate usages.
All CASC courses take place in central London, in or close to the Institute of Child Health. Specific details of the course venue will be supplied after registration.
External Delegates (Non-UCL) £125.00
UCL Staff, Students, Alumni £62.50 *
ICH/GOSH Staff and Doctoral Students FREE †
* Valid UCL email address and/or UCL alumni number required upon registration. Please note, this category does not include hospital staff unless you hold an official contract with the university.
† Limited free spaces available. If there are no free places remaining, ICH/GOSH Staff and Doctoral Students can still register at the UCL rate.
Prices include printed course materials, refreshments (and lunch for non-ICH/GOSH participants 12.45pm - 1.45pm).
Please note that no refunds will be given for cancellations made within five working days of the course start date or for non-attendance, and for individuals attending the course on a funded place, a fee will be charged for late cancellation/non-attendance according to the same time frame. This fee is needed to cover printing, catering, etc. costs that are ordered no later than 5 days before the course and are based on the number of people registered at that point in time.
- Future Dates
Dates Time Cost Apply 25th Oct, 2017
10.00am – 4.30pm
Click to Register
1st Feb, 2018 10.00am – 4.30pm £125*† TBC 6th June, 2018 10.00am – 4.30pm £125*† TBC
*Cost for external participants.
†Price includes printed course materials, refreshments (and lunch for non-ICH/GOSH participants 12.45pm - 1.45pm).
“A really useful day. Just the right level for me and addressed some knowledge deficits. Lots to think about” “Thank you very much, the course was indeed helpful!” "I found this course extremely interesting and useful. It clarified many points of definitions and limitations of the different tests. I thought the practicals were essential and useful to consolidate the points learnt.” "A great course, it brought together a lot of things, I didn't realise were connected.” "The presenter was very good. It was good doing all the practicals to help understand the concepts.” "The lecturer was great and very engaging.”