Math Forum / Mathematics / Statistics / July 2009

I have two cumulative distributions function H and G over R^2. H is
absolutely continuous with respect to G, so the Radon-Nikodym
derivative exists and is unique G-almost everywhere.
My problem: Among the Radon-Nikodym derivatives, I need a selection

I'm trying to do multivariate nonlinear regression analysis with R.
Is this possible?
I'm also trying to do analysis for lagging effects.   For example,
given some unknown delta of time, I need to time shift my multivariate

Are the critical values modified?
This is a long-lasting problem concerning Hypotheses Tests I am not able to find out a solution.
___Suppose that test B (e.g. mean greater than 0) needs that the Population has a feature A (e.g. be Normal). I get a sample S and perform the test ...

I am running a regression of 5 independent variables:
y=intercept + beta1*X1+ beta2*X2 + beta3*X3+ beta4*X4 +beta5*X5
My teacher is questioning whether X1 truly captures what is supposed to capture since it is an index about how well a firm is managed but this index doesn't take ...

Hi, I have a big problem answering this question. Could anyone please
help me?
Consider the function known as logit function
g(q) = log(q/(1-q))                for any 0 < q < 1

i am studying principal component analysis (PCA). i need to know how
to compute to which eigenvector (or principal component) a variable is
most correlated with. any help or pointers is appreciated. thanks.

The problem: If 100 novices are asked to aim at a target, they will
hit all around the target (some above, some below, left or right). As
per the statistics their average would the actual target. But as per
the Normal Distribution they would be hitting more towards the

Hi guys, I need help with this question
Signals are transmitted over a cascaded series of channels that are
not reliable
The i-th channel in the series is fully operational with probability 1-

its been 16 years since Stats 101 and I need some help.  I am not
sure
if i can use stats for the below scenario, and if so how to use it.
Scenario:

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Let me start by giving some context.  A colleague has a data set in
which some physiological variables (e.g., heart rate) were measured at
baseline, and again during an activity.  Let X represent the baseline
measure, and Y the activity measure.  This was done for two different

I am learning Hypothesis Testing with Binomial Distribution, and I
have questions regarding an exercise from a text book. The exercise is
to test if a die is fair and there is suspection that it's biased
towards 3.  The die is tossed 10 times and 4 tosses are 3.

Hi all! I'd like to ask this question
Let X~U[-1,2] and Y~exp(1)
(a) Find P[X<=Y]
(b) Let V = min {X,Y}. Find the CDF and PDF of V

This is a somewhat poorly formed question but the problem it
represents has troubled me several times in my career. Essentially
many theories may state that a particular phenomenon exists either as
a dimension or as a set of discrete categories. For example Reversal