median calculation - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 2 CK Forum

USMLE Step 2 CK Forum USMLE Step 2 CK Discussion Forum: Let's talk about anything related to USMLE Step 2 CK exam


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 04-11-2014
USMLE Forums Addict
 
Steps History: 1+CK+CS
Posts: 171
Threads: 67
Thanked 20 Times in 18 Posts
Reputation: 30
Default median calculation

may be this is silly for alot of you , but if there is repeated readings how we calculate the median , do we use it once or more ??as i know from step 1 we use it once but here in uworld it is different
if you have (18,20,21,22,22) what is the median ??? and why ?
Reply With Quote Quick reply to this message



  #2  
Old 04-11-2014
mdsoon's Avatar
USMLE Forums Veteran
 
Steps History: 1+CK+CS
Posts: 259
Threads: 8
Thanked 115 Times in 78 Posts
Reputation: 125
Default

Quote:
Originally Posted by hydrocephalus View Post
may be this is silly for alot of you , but if there is repeated readings how we calculate the median , do we use it once or more ??as i know from step 1 we use it once but here in uworld it is different
if you have (18,20,21,22,22) what is the median ??? and why ?
Median is the MIDDLE number. You have 5 numbers total. Spiting the numbers in half. 18, 20 on one side and 22, 22 on the other side. the middle is 21.



Mode is the most common reoccurring number. so that would be 22.

Mean is average. 103/5 = 20.6
__________________
2015 grad , Step 1-[X], Step 2CK [X], Step 2 CS [X] , Step 3 [X], MATCHED IM 2015. PGY-1 to Infinity.
Reply With Quote Quick reply to this message
The above post was thanked by:
hydrocephalus (04-12-2014)
  #3  
Old 04-11-2014
mdsoon's Avatar
USMLE Forums Veteran
 
Steps History: 1+CK+CS
Posts: 259
Threads: 8
Thanked 115 Times in 78 Posts
Reputation: 125
Default

Also.


Dr. wikipedia provides a good explanation.

In statistics and probability theory, the median is the numerical value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. The median of a finite list of numbers can be found by arranging all the observations from lowest value to highest value and picking the middle one (e.g., the median of {3, 3, 5, 9, 11} is 5). If there is an even number of observations, then there is no single middle value; the median is then usually defined to be the mean of the two middle values [1] [2] (the median of {3, 5, 7, 9} is (5 + 7) / 2 = 6), which corresponds to interpreting the median as the fully trimmed mid-range. The median is of central importance in robust statistics, as it is the most resistant statistic, having a breakdown point of 50%: so long as no more than half the data is contaminated, the median will not give an arbitrarily large result. A median is only defined on ordered one-dimensional data, and is independent of any distance metric. A geometric median, on the other hand, is defined in any number of dimensions.
__________________
2015 grad , Step 1-[X], Step 2CK [X], Step 2 CS [X] , Step 3 [X], MATCHED IM 2015. PGY-1 to Infinity.
Reply With Quote Quick reply to this message
The above post was thanked by:
hydrocephalus (04-12-2014)
  #4  
Old 04-12-2014
USMLE Forums Addict
 
Steps History: 1+CK+CS
Posts: 171
Threads: 67
Thanked 20 Times in 18 Posts
Reputation: 30
Default

Quote:
Originally Posted by mdsoon View Post
Also.


Dr. wikipedia provides a good explanation.

In statistics and probability theory, the median is the numerical value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. The median of a finite list of numbers can be found by arranging all the observations from lowest value to highest value and picking the middle one (e.g., the median of {3, 3, 5, 9, 11} is 5). If there is an even number of observations, then there is no single middle value; the median is then usually defined to be the mean of the two middle values [1] [2] (the median of {3, 5, 7, 9} is (5 + 7) / 2 = 6), which corresponds to interpreting the median as the fully trimmed mid-range. The median is of central importance in robust statistics, as it is the most resistant statistic, having a breakdown point of 50%: so long as no more than half the data is contaminated, the median will not give an arbitrarily large result. A median is only defined on ordered one-dimensional data, and is independent of any distance metric. A geometric median, on the other hand, is defined in any number of dimensions.

thank you so much , i had this doubt about repeated values if we use it or not
Reply With Quote Quick reply to this message
  #5  
Old 04-12-2014
mdsoon's Avatar
USMLE Forums Veteran
 
Steps History: 1+CK+CS
Posts: 259
Threads: 8
Thanked 115 Times in 78 Posts
Reputation: 125
Default

Quote:
Originally Posted by hydrocephalus View Post
thank you so much , i had this doubt about repeated values if we use it or not
a repeated value is just another data point. think of it as 5 different people who provide 5 different scores for the same single test.
__________________
2015 grad , Step 1-[X], Step 2CK [X], Step 2 CS [X] , Step 3 [X], MATCHED IM 2015. PGY-1 to Infinity.
Reply With Quote Quick reply to this message
  #6  
Old 04-19-2014
Marikella's Avatar
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 18
Threads: 4
Thanked 11 Times in 8 Posts
Reputation: 21
Default

Quote:
Originally Posted by hydrocephalus View Post
may be this is silly for alot of you , but if there is repeated readings how we calculate the median , do we use it once or more ??as i know from step 1 we use it once but here in uworld it is different
if you have (18,20,21,22,22) what is the median ??? and why ?
More difficult will be if there was 18, 20, 22, 22

In that case median will be middle two divided by two 20+22=42 /2 = 21 .
Reply With Quote Quick reply to this message



Reply

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
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.
Location
Where you live. Leave blank if you don't want to tell.

Log-in

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
Mean, Median, Mode Evergreen USMLE Step 1 Forum 15 03-14-2013 09:25 AM
median nerve damage MedicalExaminer USMLE Step 1 Forum 0 03-08-2013 12:24 PM
Biostat question mean,median and mode vnagubandi USMLE Step 1 Forum 5 01-03-2013 11:55 AM
Calculating The Sample Median Novobiocin USMLE Step 2 CK Forum 1 07-15-2012 06:52 PM
Mean, Median, Mode rasheed USMLE Step 1 Mnemonics 0 10-22-2009 11:56 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)