Normality - reasons for screening data, Advanced Statistics

Normality - Reasons for Screening Data

Prior to analyzing multivariate normality, one should consider univariate normality

  • Histogram, Normal Q-Qplot (values on x axis with expected normal values on the y axis)
  • Skewness and Kurtosis (null hypothesis: values around zero with alpha levels of .01 or .001
  • Kolmogorov-Smirnov Test

 

Multivariate normality refers to a normal distribution of combination of variables (two-by-two, plus all linear combination of the variables) Univariate normality is a necessary but not sufficient condition for multivariate normality.

For bivariate normality one should check all the two-by-two scatter plots (they should have elliptical shape)

Sometimes data transformation is necessary for normality.

 

Posted Date: 3/4/2013 6:25:28 AM | Location : United States







Related Discussions:- Normality - reasons for screening data, Assignment Help, Ask Question on Normality - reasons for screening data, Get Answer, Expert's Help, Normality - reasons for screening data Discussions

Write discussion on Normality - reasons for screening data
Your posts are moderated
Related Questions
Individual differences scaling is a form of multidimensional scaling applicable to the data comprising of a number of proximity matrices from the different sources that is differe

The Null Hypothesis - H0: β 1 = 0 i.e. there is homoscedasticity errors and no heteroscedasticity exists The Alternative Hypothesis - H1: β 1 ≠ 0 i.e. there is no homoscedasti

The measure of the degree to which the particular model differs from the saturated model for the data set. Explicitly in terms of the likelihoods of the two models can be defined a

The theory of measurement which recognizes that in any measurement situation there are multiple (actually infinite) sources of variation (known as facets in the theory), and that a

National lotteries : Games of chance held to heave money for particular causes. The first held in the UK took place in the year 1569 principally to raise money for repair of the Ci

Bootstrap : The data-based simulation method/technique for the statistical inference which can be used to study the variability of the estimated characteristics of the probability


This term sometimes used to describe the extra factor in variance of the sample mean when n sample values are drawn without the replacement from the finite population of size N. Th

The method or technique for displaying the relationships between categorical variables in a type of the scatter plot diagram. For two this type of variables displayed in the form o

Duck Lovers Unlimited (DLU) Inc. assembles specially configured light jet aircrafts for airborne duck hunting. The quarterly demand forecasts for the upcoming fiscal year are: