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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. …
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).$$
The Delta method using $f(x) = e^x$ will imply …
5
votes
1
answer
3k
views
Delta method and correlated variables
They propose to calculate the standard error using the delta method. … You can also see the estimated standard error using the delta method is much larger than the ones estimated using other methods. …
1
vote
0
answers
732
views
Understanding the delta method
I'm trying to work on #1 from Chapter 15 of Greene's Econometric Analysis and I'm confused about how to use the Delta method. … /n
\end{bmatrix}
$$
My question is how to properly apply the Delta method. …
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 …
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. …
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 …
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. …
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? …
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... …
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? …
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. …
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? …
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. …
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 …