This preview shows page 1. Sign up to view the full content.
A. Chisquared and Nonparametric Tests
B.
C. Nonparametric Measures
I.
Do not depend on estimation of population values and do not follow population
distributions
a. Instead of coming up with clean regression lines, which assumes normality of the
distribution, it comes up with choppy lines that best fit the data at each point in the line
D. Chisquare Distributions
I.
A family of different types of distributions (multiple types of functions as opposed to a
normal distribution) that are chosen depending upon the degrees of freedom (which changes
how the distribution is skewed) where the df ranges from 1 to 4
a. It has only one parameter (degrees of freedom)
b. Mean = degrees of freedom; Variance = degrees of freedom * 2
c. It is a distribution of squared z scores
i.
chisquared(1 df) = χ
2
(1)
= z
2
= (x – X)
2
/s
2
ii. This will create a distribution that has no negative values, so the distribution will be
positively skewed
iii. χ
2
(2)
= z
2
1
+ z
2
2
= (x
1
– X)
2
/s
2
+ (x
2
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 04/17/2008 for the course PSC 204A taught by Professor Emelio during the Fall '07 term at UC Davis.
 Fall '07
 EMELIO

Click to edit the document details