All Questions
215,813
questions
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Kurtosis of b(n,p) - binomial distribution
So I have this problem that I’m trying to do.
I been at this for hours.
It’s to find the kurtosis of a binomial distribution.
So far, I have that M’’’’(0) = $n[(n-1)(n-2)(n-3)p^4 + 6(n-1)(n-2)p^3 +7(n-...
3
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What is a good, recent (>2015) academic introduction to errors-in-variables models?
I'm aware of this resource https://en.wikipedia.org/wiki/Errors-in-variables_models, but I don't put a lot of faith into wikipedia articles on stats, so I'm looking for some academic references on the ...
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Maximum likelihood estimator when the Fisher information matrix is not invertible?
It is known that maximum likelihood estimator (MLE) is asymptotically efficient, i.e., $\sqrt{n\,}\,\left( \widehat{\theta \,}_{\mathrm{mle}}-\theta _0 \right) $ converges in distribution to a ...
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Bias estimation (after reversing the log transformation) in parameter estimation of fractional Brownian motion
I am learning these two literature,
1 [SIMULATION AND IDENTIFICATION OF THE FRACTIONAL B ROWNIAN MOTION : A BIBLIOGRAPHICAL AND COMPARATIVE STUDY COEURJOLLY Jean-François]
2 [Estimating the Parameters ...
- 103
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5
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Instrumental variables with measurement error in simultaneous equations model
I have a question related to measurement error bias and the use of instrumental variables in the context of simultaneous equations. Suppose I have the following system of structural equations
\begin{...
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13
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Constructing Asymptotic Interval for Mean
My question is as follows:
$X_1, ..., X_n$ are iid. realizations of random variable $X \in (0, \infty)$ with $E(X) = \mu$ and $V(X)=\mu +\theta \mu$. I am trying to construct an asymptotic size $\...
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How to calculate k-means clustering with presence of double-zeroes? [closed]
I've tried to find species assemblages with a data set that has double-zeroes. When I run the tests, the results are inconclusive and no groups seem to be significant.
I used hellinger's ...
capthom_obvious
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5
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Combined reliability for statistically independent tests/measurements
I'm perplexed by this statement in Wikipedia article, 'Consilience':
"Statistically, if three different tests are each 90% reliable when they give a positive result, a positive result from all ...
- 21
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NMDS with Morisita-Horn Index: which data-transformation makes sense?
I have a community matrix of spiders, which I captured during winter in different forest stand-types.
I now want to perform an NMDs. For that I want to use the Morisita-Horn Index from R in the ...
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Calculate gradient with chain rule using additions [closed]
I am taking Karpathy's course, specifically I am on the first video. There is a step in the development of micrograd that I don't fully understand. Specifically in this section, when he talks about ...
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Repeated Measures HLM in R using lme4 [closed]
I have conducted an experiment with within-subjects Design. Each participant interacted with two systems and after each interaction the same constructs were measured with a questionnaire. The order, ...
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9
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Reducing Variance with Regularization in LOOCV for Small Datasets
I have a small dataset and I am considering using Leave-One-Out Cross-Validation (LOOCV) to evaluate my model. I understand that cross-validation, in general, is a method to assess a model's ...
- 1
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1
answer
23
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Would it be possible to use regularization methods as a feature selection method and then use machine learning models to analyses data?
My data is RNA-seq data with more than 14000 features and the problem is binary classification. Then the total sample is 50 and p>>n. When I use Elasticnet method with train and test data, the ...
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How can I find a characteristic curve using multiple 2D point clouds?
I study mechanical engineering and need to find the characteristic of a hydraulic component. I have a 2D point cloud like this.
For one curve, ChatGPT recommends using intervals and calculating the ...
- 1
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How do i solve this problem on conditional probability [closed]
Where x~ u(0,4), what is P(X>Y|X<2Y)
I know that X lies between Y at the lower bound and 2Y at the upper bound but i am having trouble trying to figure out P(X<2Y) as none of the examples i ...
