# Questions tagged [estimation]

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### SEM: can GLS estimation be used under severe nonnormality?

In Randall E. Schumacher's and Richard E. Lomax's book "Beginer guide to SEM", the writers keep saying that if non-normality is sensed, where you can't use ML, you can go for GLS/ADF/WLS. ...
80 views

### In SEM, what is the difference between ADF and WLS estimation methods?

In some books both WLS and ADF are considered different methods. In other books, they acknowledge that ADF = WLS, so they are used interchangeably throughout the book. How solve this confusion?
28 views

### How to estimate population statistics for each category?

I have data from a simple random sample having n elements which I’m using as an unbiased estimate for my population statistics (mean). My population can be divided into k categories, and I know the ...
47 views

### How can i find bias of estimator for specific value?

I have $X_1,...,X_n~ Ber(p)$ with MLE estimator $\hat p$ which is equal to sample mean. I need to find bias of estimator $\hat p(1 - \hat p)$ for $p(1-p)$. I presume $p(1-p)$ is variance of my RVs, so ...
41 views

### What test to use for threshold

I've got a problem where, with my basic knowlegde of statistical tests, I'm not sure how to solve it. I have a dataset with data on the execution of a process. This includes: Time the process lasted ...
48 views

### How to calculate confirmatory factor analysis by hand?

I am trying to learn how confirmatory factor analysis works and the way I learn is best by understanding how the calculations work by hand using a pen, paper, and a calculator, and then replicate this ...
36 views

### Empirical estimation of conditional distribution $Y|X$ at the boundaries of X

I want to estimate conditional distributions of Y | X. Where X contains several continuous covariates. I'm coding in R. I tried several methods so far, but none gives me entirely satisfactory results ...
From this https://content.wolfram.com/uploads/sites/19/2013/04/Zwilling.pdf : But I don't know how to solve it . I know let the derivative of the function L with respect to $\alpha$ and $\beta$ equal ...