What is Categorical Data? - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
USMLE Articles
Go Back   USMLE Forums > USMLE Step 1 Forum

USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam

Thread Tools Search this Thread Display Modes
Old 05-24-2011
USMLE Forums Guru
Steps History: Not yet
Posts: 298
Threads: 45
Thanked 718 Times in 210 Posts
Reputation: 728
Stats What is Categorical Data?

Can anyone explain what is meant by categorical data?

I am confused about when to use a t-test versus a chi-squared test. An example would be greatly appreciated!

Reply With Quote Quick reply to this message

Old 05-24-2011
Ex-USMLE Forums Staff
Steps History: 1+CK+CS+3
Posts: 753
Threads: 106
Thanked 2,204 Times in 466 Posts
Reputation: 2252

Categorical data is the data that can be divided into groups and that are not measured in exact numerical data.

For example:
Age groups, educational levels, gender, race, ...etc

Note that the same variable can also be sometimes numerical for example Age, can be categorical if you speak of age groups but it can also be numerical if you speak of the exact age in years for example.

So you need to see what the question is talking about, see if they are grouped data (categorical) or measured data (numerical).
Reply With Quote Quick reply to this message
The above post was thanked by:
apx85 (05-24-2011)
Old 05-24-2011
Claus_CU's Avatar
USMLE Forums Addict
Steps History: 1 + CS
Posts: 113
Threads: 8
Thanked 89 Times in 61 Posts
Reputation: 99

You'll use X2 to test the null hypothesis of no association between the variables.

the type of categorical data most use for this purpose is fractions and proportions.

as a rule of thumb, if you can build a two by two table, you can use X2.
Reply With Quote Quick reply to this message



Quick Reply

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Where you live. Leave blank if you don't want to tell.


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
IM categorical and preliminary in the same hospital! aoba IMG Residency Match Forum 3 10-07-2012 12:58 AM
Data Gathering Step 2 CS juancho USMLE Step 2 CS Forum 29 02-03-2012 11:19 PM
Applying to Prelim versus Categorical? Safari-CNS IMG Residency Match Forum 2 08-07-2010 11:02 AM
Kaplan Qbank "We are still Gathering Data"! Qadri USMLE Step 2 CK Forum 2 07-12-2010 08:32 AM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)