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Results for "Delta method"
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0 votes
1 answer
179 views

Delta method confusion

I am supposed to use the delta method to find the limiting distribution for $$\sqrt{n}\left(\frac{\overline{X}_n}{1-\overline{X}_n} - \frac{E(X)}{1-E(X)}\right)$$ where $f(x, \theta)=\theta x^{\theta-1 … I'm utterly lost on how to do this, as this doesn't line up with how he briefly explained the Delta method in class. …
Michael Devin Smith's user avatar
6 votes
2 answers
619 views

Delta method vs actual expectation

.$$ I am trying to figure out where the "Delta method" is wrong here: If $(x-\mu) \sim N(0,\sigma^2)$, then $$(f(x)-f(\mu)) \sim N(0,\sigma^2 f'(\mu)^2).$$ The Delta method using $f(x) = e^x$ will imply …
dayum's user avatar
  • 633
5 votes
1 answer
3k views

Delta method and correlated variables

They propose to calculate the standard error using the delta method. … You can also see the estimated standard error using the delta method is much larger than the ones estimated using other methods. …
Ondrej's user avatar
  • 567
1 vote
0 answers
732 views

Understanding the delta method

I'm trying to work on #1 from Chapter 15 of Greene's Econometric Analysis and I'm confused about how to use the Delta method. … /n \end{bmatrix} $$ My question is how to properly apply the Delta method. …
user21359's user avatar
  • 229
3 votes
1 answer
8k views

estimation of population ratio using delta method [closed]

am writing a seminar on estimation of population ratio using delta method and am having problem on the literature review. i have written the introduction but need help on on how to use delta method to …
user avatar
6 votes
2 answers
924 views

Delta method for Poisson ratio

I would like to find the asymptotic distribution of $$\frac{\overline X}{\overline X + \overline Y }$$ using delta method. … I would appreciate thoughts on how delta method can be applied in this scenario. …
Bihu Duo's user avatar
  • 184
9 votes
1 answer
4k views

How to interpret the Delta Method?

I'm reading through https://www.statlect.com/asymptotic-theory/delta-method it defined the Delta Method as: The delta method is a method that allows us to derive, under appropriate conditions, the …
foobar's user avatar
  • 733
3 votes
0 answers
362 views

Standard errors with delta method

Under the table there's a small note that SE were calculated via "delta method". … Ideally both, "on paper" and in R using the "delta method". So far I have tried alr3 package and its deltaMethod() function. I tend get to the right estimate but the SE is 0.00000. …
bajun65537's user avatar
5 votes
1 answer
946 views

Delta method for non-normal variables

Is the delta method valid also for non-normal variables? Claim: Let $\sqrt{n}(\hat{X}_n-\theta) \xrightarrow{d} \hat{f} $. With $\hat f$ having a finite distribution. … Where can I find such generalizations of the delta method? …
Thomas's user avatar
  • 952
1 vote
0 answers
115 views

Using the Delta Method when Data is Missing

The idea of the delta-method is that if you have a "nice" function $f$ and a consistent estimator $B = (B_1, B_2)$ of $\beta$, then: \begin{equation} \sqrt{n} \big( f(B) - f(\beta) \big) \dot{\sim} N\ … This presentation of the delta method assumes you have $n$ observations of both variables in $B$. In real life things are not so pretty... …
Rodrigo Zepeda's user avatar
1 vote
1 answer
1k views

Delta Method Confidence Intervals

From initial research it seems that I can use the delta method for this calculation, but am not sure how to do so. Can anyone help with this? …
m55667's user avatar
  • 51
4 votes
0 answers
169 views

An example of delta method performing poorly

Q: Is there an example of the delta method being used in applied statistics where the sample size needed for a good approximation is practically unfeasible? … I am looking for an example from applied statistics where the delta method works poorly. …
KOE's user avatar
  • 4,601
1 vote
0 answers
871 views

Delta method in a multinomial logistic regression

I use the estimated coefficients to get the estimated odds and then I apply the Delta Method (package "deltamethod") to get robust standard errors. So far, I am following the instructions here. … The problem is that after applying the Delta Method, some variables that have been highly significant before the transformation become insignificant. What is the cause? …
user19980's user avatar
1 vote
0 answers
549 views

Why is delta method only for asymptotic distributions?

I'm wondering why the delta method, , "is only used for asymptotic distributions", as @mpiktas write in this post: Variance of a function of one random variable, or as is written here: "The delta method … is a general method for deriving the variance of a function of asymptotically normal random variables with known variance" I'm wondering what it means that a random variable is asymptotic. …
HeyJane's user avatar
  • 355
1 vote
0 answers
703 views

Delta method for vector valued functions

. $$ I am interested in a quantity $\mathbf{h}(B):\ \mathbb{R}^m\rightarrow\mathbb{R}^p$, and would like to use delta method to approximate the asymptotic distribution. … When $p=1$, multivariate Delta method would provide $$ \sqrt{n}(\mathbf{h}(B)-\mathbf{h}(\beta))\rightarrow\mathcal{N}(0,\nabla\mathbf{h}(\beta)^T\cdot\Sigma\cdot\nabla\mathbf{h}(\beta)). $$ Can we say …
user15988's user avatar

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