# All Questions

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### How to calculate required sample size for desired false negative rate

I'm trying to design a system that does some binary classification. The cost of a false negative is high, so I want to ensure that I've tested thoroughly enough to minimize this chance. I would like ...
16 views

### Filter one-sided tests before FDR

In this blog post, the author shows one example of "weird" p-value histogram ("Scenario C"): One provided explanation is that a one-sided test was run, and the tests where the ...
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1 vote
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+50

### Model has higher (and closer to 1) $\beta$, but similar $R^2$ and correlation

I have model one which produces prediction $\hat{y_1}$, later I came up with a new model which produces prediction $\hat{y_2}$. I have ground truth $y$. The models are not regression based but they ...
• 31
474 views

### Examples of distributions with easily solvable quantile functions but hard to solve CDFs

I'm interested in examples of probability distributions where the quantile function $F^{-1}(p)$ exists in closed form or is easy to calculate but where the cumulative distribution function (CDF) $F(x)$...
23 views

### Help for a probability test comparing presence/absence of expected number between two entities

I have a probability problem I don't know how to solve. In that problem I have a genome of a VirusA with 100 genes for which I know 20/100 are unique to this virus. In the other end, I have another ...
• 125
59 views

### Confused on Bayesian Decision Theory

I am trying to understand what is the right way to pick up an "action", as it is called in Murphy, Machine Learning a Probabilistic Perspective, in the 'chatper 'Bayesian decision theory'. I'...
51 views

### lmer - How to interpret correlation between Random Factors?

My model: DV ~ 1 + Time * IV + (1 + Time | Subject_ID) Where IV is the between-subjects independent variable, and ...
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22 views

### Checking model after convergence issues with glmer logistic regression

I'm running a logistic regression model where subject ID is nested within litter ID, using glmer. The equation is as follows: glmer(outcome ~ group * time + previousStatus + (1|litter/pup), data, ...
• 493
11 views

### Averaging classification metrics vs Direct infer

Suppose I have tensor X_test with this shape: (10,2,512) Where: 10 is num of ID 2 is num of Channel of every ID, let's say ...
26 views

### In X-learner uplift modeling, predictions from the 1st-stage models help train the 2nd-stage models. What data splits should these predictions be on?

In uplift modeling with an X-learner metalearner (Künzel et al. 2019), predictions from the two first-stage models are used in training the two second-stage models. Question: What datasets/splits ...
33 views

### Is a logistic regression appropriate for my question and correctly interpreted?

I need help knowing if my statistical approach is correct for what I want to achieve. I want to know whether a trial that follows an error (i.e., has a post.error value of 1) makes it more likely that ...
1 vote
72 views

### Does my observational study present as being a nested or crossed design?

I need some help deciding whether my sample collection design qualifies as nested or crossed. The design is: I collect data once per site (at the same 47 sites), once per season (wet and dry; May-Nov ...
• 1,653
14 views

### Simulate Gaussian copula with negative pair-wise correlations

I am now trying to simulate a multidimensional (let's say 4 dimensions) Gaussian copula. Given software restrictions, I can only use Excel for this simulation. That is why I am trying to implement the ...
116 views

• 941
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### Ascertaining sub-probabilities using re-sampling of the data. Multivariate convergence?

I am trying to compute a payout for an online game that has the following information: 40% chance of a loss with value -2 10% chance of a loss with value -1 remaining 50% chance with four potential ...
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1 vote
22 views

### Gaussian Process Literature suggestion

I'm quite new to Gaussian Process and hope to get some help regarding the materials to read up on here. Suppose I have the following 2d time series data table: \begin{bmatrix}s_{t_1}^{v_1} & s_{...
1 vote
14 views

### Hausman Test Reults Report

I've been working on a research project using a multi-level regression model, and I'm currently figuring out how to present the Hausman test results. I've seen some papers where authors mention doing ...
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24 views

### How is summation by parts technique used in this derivation?

In this answer, whuber comments that the technique used in the answer is summation by parts: The discrete case, assume that $X \ge 0$ takes non-negative integer values. Then we can write the ...
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54 views

### Why is my pvalue for chisquared test so high?

I am sampling from values = [0, 1] with prob = [.25, .75]. I obtain 25019 zeros and 74981 ones. Yet, by chisquared test results in the following: statistic=0.0196, pvalue=0.889 This doesn't seem to ...
• 372
42 views

### Why is the amount of Eigenvalue of the first Principal component much higher than the rest of the PCs?

I have the time series of 16 water quality parameters, and after standardizing them using the zscore method, I performed principal component analysis. These are my eigenvalues [7.62675203795075 2....
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1 vote
54 views

### Customized distribution fitting

I have a sample of continuous surgery durations and want to fit a distribution to this sample to generate random numbers accordingly. Using the scipy library in ...
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### I have a dataset with 18 biomarker features and a target variable. I want to find the features which are having the biggest impact on the target

I Have some disease biomarker datasets that contain 18 biomarker readings from different samples and a target variable which shows presence or absence of disease (features are both categorical and ...
14 views

### How to determine correct correlation structure for GEE model?

I want to use Generalized Estimating Equations (GEE) to model longitudinal survey data. Participants' responses were recorded at two separate treatment sites at three timepoints, but the exact days ...
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1 vote
18 views

### Dimensions in ICA

I'm going through Andrew Ng's notes on ICA and the blind source separation example mostly makes sense. In essence, we have $d$ microphone recordings $x \in R^d$ and also $d$ independent speakers in \$s ...
10 views

### Difference in Difference or HLM/Mixed Effects Model?

I am working on evaluating a high school intervention. A group of 14-16 9th grade students are recruited each year to do attend a local college part time. I would like to understand how this impacts ...
10 views

### How to get sphericity results with Anova() function from Car package [closed]

I have an unbalanced dataset. I want to run a mixed ANOVA (type III) with the Car package. My dataset has 3 factors: Day (10 levels, within-subject factor), Sex (2 levels, between-subject factor) and ...
1 vote
18 views

### MLE for a minimum of Ornstein–Uhlenbeck process

Using MLE for parameter estimation of a one-dimensional Ornstein–Uhlenbeck process is widely known. However, has a similar work been done of a process on the form X_t = \min \left( \...
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20 views

### Monte Carlo method for likelihoods ratio density estimation

I recently started reading Stephen Kay's Fundamentals of Statistical Signal Processing - Detection Theory (Volume II) and there is something I do not fully understand about likelihoods and hypothesis ...
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170 views

### I have count data, but it does not follow a Poisson distribution, what to do?

My data consists of 3 variables, one is a numerical variable of the number of flower visits that I have counted on certain locations and on certain shrub species. My other 2 variables are categorical ...
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1 vote
59 views

### Does artificially balancing outcomes in regression lead to poor calibration? If so, how to show the poor calibration?

In "classification" problems, it is common for there to be unbalanced-classes. To combat what appears to be a problem (though I would argue that it usually is not a problem), it is common ...
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