PQ Systems Knowledge Base

Category » Chi-Squared

There were 3 articles found in this category:

1. ST: Chi Square and Confidence
   Revision Date: 2005-09-06 Problem: At the 99.5% Confidence level, we say that the data fits the (bell) curve. But, at the 99% level, we say that it does not. Are we actually saying the wrong (or confusing) words? Solution: The confusion is semantical. In the 99.5% confidence case, we would ...
2. ST: Which is better, a Chi-Square of .44 with 1 degree of freedom or a Chi-Square of 4.01 with 2 degrees of freedom
   Revision Date: 2005-09-06 Neither one is very good. In general, the number of degrees of freedom is based on how much data you have. The more data, the more degrees of freedom you tend to have, and the more confident you feel that the result reflects accurately the information about the dat ...
3. ST: Chi-Square and Confidence (more)
   Revision Date: 2005-09-06 Problem: With the standard Confidence of 95%, it tells me that the data fails the confidence test. But if I put it up at 99.5% (which says to me that I want to be really confident), then it tells me that if fits the data. This seems to be backwards. It would seem t ...