# Search results

1. ### Mathematical Stats Book recommedations for noncentral distributions

Hi! i am looking for mathematical stats book recommendations for noncentral distributions. I am currently using "Hand-book on STATISTICAL DISTRIBUTIONS for experimentalists" and "Handbook of Statistical Distributions with Applications" but both the free-ebooks do not provide proofs.
2. ### noncentral t distribution

Please help me prove that the pdf of a noncentral t distribution is a valid pdf. That is, to prove that the integral of the pdf of noncentral t distribution from negative infinity to infinity is 1. The attached document contains my attempt.
3. ### Introduction to Estimation(need help with terms)

Which of the following definitions is incorrect? Estimation It is a process by which sample data is used to estimate or approximate the value of an unknown population parameter. The estimate can be expressed as a single value, known as a point estimate, or a range of values, known as an...
4. ### Introduction to simulation with sas

Does anyone know any tutorial links for introduction to simulation with sas?
5. ### Functions and inverse images

Does anyone know any links to property proofs on functions and inverse images?
6. ### Spearman's Rank Correlation Coefficient

Since Spearman’s rho is a measure of general dependence between two variables, does this mean a correlation of zero means zero relationship between variables?
7. ### The Runs Test

Why do we say that a runs test is used to test whether it is reasonable to conclude that data occur randomly, not whether the data are collected randomly?
8. ### Nonparametric statistics v.s Parametric statistics

Why nonparametric statistics is less preferred compared to parametric statistics even if it requires fewer assumptions?
9. ### Contingency tables

Why do we say expected cell counts would occur by chance if the variables are independent over the long run?
10. ### Residuals v.s errors

What is the difference between a residual and an error? Is it wrong to say an error is the difference between the data points and a fitted line while a residual is the difference between data points and the sample mean.Please help!!
11. ### Assumptions that underlie a regresion model

Are there any statistical tests that i can use to evaluate whether the assumptions for the regression model are being met? The assumptions i want to test are: 1. The model adequately describes the behaviour of the data. 2. The random error term is an independently and normally...