The concept of P Value! - 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 1 Forum

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


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-14-2012
johnvega98's Avatar
USMLE Forums Addict
 
Steps History: Step 1 Only
Posts: 122
Threads: 34
Thanked 25 Times in 16 Posts
Reputation: 35
Stats The concept of P Value!

Can someone explain the P value concept in understandable terms?

Please?


__________________
"The race is long, and, at the end is only with yourself."

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
The above post was thanked by:
Usmle16Forall (01-23-2017)



  #2  
Old 07-14-2012
USMLE Forums Guru
 
Steps History: 1+CK+CS
Posts: 433
Threads: 52
Thanked 388 Times in 148 Posts
Reputation: 398
Default well

as far as i know, or at least use for answering questions. if p value less than .05 then the data is statistically significant and u can reject the null hypothesis but if larger then nope.....till now i am solving questions based on this concept and everything is fine al hamdolellah
__________________
You miss 100% of the shots you don't take
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
The above post was thanked by:
johnvega98 (07-15-2012), Usmle16Forall (01-23-2017)
  #3  
Old 07-15-2012
USMLE Forums Master
 
Steps History: 1 + CS
Posts: 675
Threads: 84
Thanked 427 Times in 206 Posts
Reputation: 437
Default

P value:

-It is a pre-set value (a standard you set before starting the study).

-For a study to be significant, the p value has to be less than 0.05 (this means that 95% of the time the study will be right and 5% due to chance).

-------------------------------------------------------

So in other words, p value is a way of figuring out the chance of an "error" in your study.
Therefore, p= probability of making a type 1 error.

Last edited by Renaissance; 07-15-2012 at 12:31 AM.
Reply With Quote Quick reply to this message
The above post was thanked by:
johnvega98 (07-15-2012), Usmle16Forall (01-23-2017)
 
  #4  
Old 07-15-2012
USMLE Forums Master
 
Steps History: 1 + CS
Posts: 675
Threads: 84
Thanked 427 Times in 206 Posts
Reputation: 437
Default

As a conclusion to all of this:

The association is significant (the study is significant) when:
-Confidence interval lacks the null value of 1.0
-Which means the null hypothesis (Ho) can be rejected (knowing that you could have done a type 1 error)
-p value is less than 0.05

The association is not significant (the study is not significant) when:
-Confidence interval includes the null value of 1.0
-Which means the null hpothesis (Ho) can't be rejected (knowing that you could have done a type 2 error)
-p value is more than 0.05

----------------------------------------------------------------
I wasn't able to fully understand all these terms until i integrated them like this, hope this helps.
If there's anything incorrect or inaccurate, i would love some feedback.
Reply With Quote Quick reply to this message
The above post was thanked by:
johnvega98 (07-15-2012), Usmle16Forall (01-23-2017)



Reply

Tags
Biostatistics-Epidemiology

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
NBME 2 Concept jinni USMLE Step 1 Forum 11 03-05-2012 07:45 PM
Important concept aiminghigh USMLE Step 1 Forum 3 12-11-2011 10:38 PM
NBME 11 concept. donofitaly USMLE Step 1 Forum 3 08-21-2011 12:06 PM
A-a gradient concept kemoo USMLE Step 1 Forum 4 04-30-2011 06:51 PM
Glaucoma Concept. donofitaly USMLE Step 1 Forum 1 02-19-2011 03:59 PM

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)