# All Questions

209 views

### Do we have different assumptions for point estimate and interval estimate?

The procedure for interval estimate and point estimate appears to be based on the central limit theorem. Is it a correct assertion.
48 views

### Validating sign of mean

I have a lot of experiments with the following kind of data. The sample size is $n\geq 1$. For each test $i$ in the sample a cost $c>0$ and a revenue $r_i\geq 0$. The cost $c$ is constant. The ...
111 views

### Multidimensional quantiles

I have 1000 observations with 2 continuous variables : Observation ID | X | Y
2k views

### About linear combinations of independent Brownian motions

Let $B(t)$ and $W(t)$ be two independent Brownian motions. Show that $X(t)=\frac{B(t)+W(t)}{\sqrt2}$ is also a Brownian motion. Find the correlation between $B(t)$ and $X(t)$.
565 views

### High order Markov Chain transition probability

I'm modelling a time series using high order markov chain and estimate the transition probability of the equivalent first order markov chain. The problem is that some of transition in the equivalent ...
72 views

### Kolmogorov-Smirnov test using half the sample to estimate mean and variance and testing against the other half moments for normality

using a monte carlo simulation Im just trying to test the null hypothesis for normality in a sample that splits N values into 2, using the first N/2 values to estimate the sample mean and variance, ...
189 views

340 views

### Model estimation procedure using backward elimination

I have run a multiple linear model using Minitab. The result showed that all variables are not significant. So, I use backward elimination. Lastly, I found that ...
38 views

### Model specification

Actually I want to see the impact of Investors sentiment on Aggregate stock market return, so my major concern is to identify the impact of investors sentiment. But besides investors sentiment I want ...
6k views

### given mean and standard deviation, find value of given percentile

I'm running a DnD campaign and made a Random NPC generator in Excel. It's pretty slick, but the random height/weight calculator is... flat. RAND(X,Y) flat. So I'd like to add some Bell Curve ...
122 views

### Proper splitting of data set for Ensemble methods

I have 10,000 documents. Each document has a label ($Y$) that is either $0$ or $1$ (the 0-1 split is pretty much 50/50 over my 10,000 documents). Each document has 10 fields. Each field can have any ...
2k views

### Difference between arithmetic vs geometric random walk

I have read about arithmetic and geometric random walks. What is the difference between them?
24 views

### Variance Estimation in case of nonrespondents

I saw in the book of Rubin (1987) that an increase in variance of estimation will occur due to nonresponses. But I wonder the reason behind this. Thanks for your shares!
171 views

### categorizing monthly gross income

what is the best way to categorize or even bin monthly gross income? As of now, the variable for income is numeric and continuous. I have seen many examples for annual income. Should I categorize ...
29 views

### Distribution for semi open interval

I have an application where I get back the time to perform an operation, the times are in the interval ]0:inf[ and I have this crazy idea. Lets say I know the mean ...
5k views

777 views

### Measuring intra-observer correlation

We're far from what you'd call expert statisticians, so we'd like to ask some help in an ongoing medical research. We have 60 subjects. A researcher took at least 3 times the measurements of 8 of ...
759 views

### All factors have low proportion variance explained. What could this mean about the data?

I'm running factor analysis on a survey data set. Across any number of factors, the % variance explained for all factors is very low. No factor ever has a % variance explained greater than 9%. In ...
72 views

### Implications of using survival analysis with only observed data

I am doing survival analysis on a dataset where the number of right-censored individuals is much greater than the number of observed individuals. There are about 50,000 individuals and only about 5,...
62 views

396 views

### Confused with this confidence interval statistics [closed]

The formula used to compute a confidence interval for the mean of a normal population when n is small is the following. What is the appropriate t critical value for each of the following ...