The Elsmar Cove Business Standards Discussion Forums More Free Files Forum Discussion Thread Post Attachments Listing Elsmar Cove Discussion Forums Main Page
Welcome to what was The Original Cayman Cove Forums!
This thread is carried over and continued in the Current Elsmar Cove Forums

Search the Elsmar Cove!

Wooden Line
This is a "Frozen" Legacy Forum.
Most links on this page do NOT work.
Discussions since 2001 are HERE

Owl Line

The New Elsmar Cove Forums   The New Elsmar Cove ForumsThe Elsmar Cove Forums
  Statistical Techniques and 6 Sigma
  about a test of significance example

Post New Topic  Post A Reply
profile | register | preferences | faq

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   about a test of significance example
Doctor Zaius
unregistered
posted 16 August 2001 10:52 AM           Edit/Delete Message   Reply w/Quote
Two populations, before and after. The response shows statistical significance, Null hypothesis rejected, @ an alpha of 0.05 (t-test). Pretty standard stuff I guess.

The above response is actually calculated by taking two measurements and dividing one by the other.

The same tests of significance applied to the two component measurements shows no difference between populations for ONE of the measurements (significant at alpha = 0.8 or so).

The OTHER component measurement shows significance (rejects the Null hypothesis) at an alpha of 0.15.

Here's the question: How can I have two component measurements, one showing 'no difference' before and after, and the other showing difference at a less-than-spectacular alpha, BUT the test of significance on the CALCULATED response (one divided by the other) shows significance @ a very low alpha?? How can I get "good significance" from two components that offer fair and no significance?

IP: Logged

All times are Eastern Standard Time (USA)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Marc Smith | The Elsmar Cove Home Page

Please Visit the new Elsmar Cove Forums! All these threads are there and much more!

Main Site Search
Y'All Come Back Now, Ya Hear?
Powered by FreeBSD!Made With A Mac!Powered by Apache!