# All Questions

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### Finding confidence interval given z-score and null hypothesis

I am working on a homework question and got stumped on this question. Suppose researchers perform a large-sample test of a population proportion where the null hypothesis is that the population ...
1 vote
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### Hazard function and survival analysis

I have a function $\lambda(t)$ which returns the instant probability of dying at a time $t$. I'd like to compute the function $F(t)$ which returns the probability of being dead at a certain time $t$. ...
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11 views

### How to add categorical variable to continuous when doing Linear Regression in Python?

If I have independent cts variables [x1, x2, x3] and categorical variable [x4] which can be categorized into [x4_1, x4_2] for dummy variable 0/1 If I fit linear regression in sklearn it will give me ...
3 views

### Recurrent event analysis: What approach to choose?

I am trying to examine if the interval between recurrent suicide episodes becomes shorter over the course of repeated incidents. My data is in long format with each participant occupying multiple rows ...
25 views

### Interpreting log-log regression with log(1+x) as independent variable

Is interpreting log-log regression with log(1+x) as independent variable the same as having log(x) as independent variable? 1% increase in x results in beta% change in y? What is x has both negative ...
14 views

### Is "vanilla" random forest regression appropriate when dependent variable is a rate (i.e. per 100 people)?

To add a little more context, I am working with a dataset from which I want to predict the population-normalized count of emergency department visits on county level, with 50+ independent variables. ...
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1 vote
5 views

### Can you average ICC values for Intra-rater reliability?

I am using ICCs to test the inter- and intra-rater reliability for a body condition scoring system. I have two different groups of evaluators: specialists and students. I would like to evaluate the ...
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5 views

### Three-levels Meta-Analyses: Within-study moderators and correction for publication bias?

I'm conducting a three-level meta-analysis on correlations using the {metafor} package on R. I'm quite a newbie when it comes to three-level meta-analyses, so I have two doubts. 1) From each study, I ...
12 views

### How to compare two time series with a gam?

I recently got comments back from a review who suggested I use a gam to compare two time series to see what the trends are and if the two time series are different from one another. I'm am trying to ...
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1 vote
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### Why use normality tests if we have goodness-of-fit tests?

What are the reason/s to use a normality test (e.gr., Shapiro-Wilk, Jarque-Bera) instead of a goodness-of-fit test to a normal distribution for some data we want to check for normality?
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1 vote
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### Help with terminology & methodology for a hierarchical (& imbalanced) classification problem

I have a dataset that I am not sure how to analyze, or at least I am not sure of the terms to read up on. I have 25 groups. Each group belongs to one of 3 locations. Each group consists of multiple ...
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1 vote
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### Image classification using Binary Cross Entropy but with only training examples for one of the classes e.g. class 1 VS anything else

I am training a 'specialist network' to reconstruct images of an object using a Variational Autoencoder (VAE). The training set (~15000 images) is of a single object in multiple poses. I also want ...
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### LSTM architecture for forecasting amplitude varying univariate-timeseries

Hi I am wondering if someone knows what a good LSTM architecture for amplitude varying univariate time series. I used a very simple LSTM network (1 lstm layer with 100 neuron's and FCC layer with a ...
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1 vote
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### Normality assumption of structural shocks in Vector Autoregression model

I’m currently working on forecasting yield curve evolution over time using a state space model where the transition dynamics are described using a vector autoregressive model of order 1. This model ...
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### How to determine the number of strata from stratified sampling? Any rule of thumb?

I have a continuous variable (proxy for difficulty) that I would like to discretize for stratified sampling. My sampling approach is equal allocation (I will choose an equal proportion of samples per ...
12 views

### Building model for SEM: the problematic of highly correlated variables (SEM + Covariance)

I have recently come across articles suggesting we should avoid conducting SEM when variables are highly correlated. I have a model in which X1 and X2 predicts Y through M1 and M2. Which gives me the ...
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### Using the Dunn test to get the CLD grouping for the Skillings-Mack test

I have a set of phenotypic data collected from 9 different assays of a set of different plants. Each plant was assayed at least one time, but each individual assay had a different set of plants. So ...
1 vote
40 views

### Chi-Square Difference Test for Nested Models with a Continuous Outcome

Apologies if this is a very basic question - I'm still definitely a beginner when it comes to statistical tests. I understand that chi-square tests are conducted to determine the relationship between ...
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7 views

### Matrix Factorization for Recommendation System vs just calculating Conditional Probabilities

I have a matrix factorization model (using Lightfm, without user-features) to recommend items to users, based on a user-item matrix. Context A particular recommendation stuck out to me as curious, ...
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13 views

### Techniques Used for DeepFake and Its Corresponding Research Field

I'm a beginner in image generative models, I'm trying to do some work similar to DeepFake, therefore I would like to find out first what techniques DeepFake use to generate the fake videos. Do they ...
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### Are gaussian mixture models for clustering robust to data sparsity?

I would like to cluster customers based on their product usage data (20-40 products/dimensions) on the same scale. Overall, the data is reasonably log-normally distributed for all products (the ...
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6 views

### For a CNN Neural Network, why do we need to specify the number of nodes in the Conv2D function in Keras? [closed]

As I understand, in CNN, we are only doing dot product calculation on the image in the convolution layer. Below is an example of convolution code. ...
• 111
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### Why not perform weight decay on layernorm/embedding?

I am learning the code of minGPT. In the function, the author excluded layernorm and embedding layer from experiencing weight decay and I want to know the reasons. Besides, what about batchnorm?
26 views

### How do I handle basic time series prediction? [closed]

I have data like: may 2019 value=74 cost centre=c1 and I want it to predict values for cost centres. The data is monthly and I only have a few years worth (max 48 ...
• 133
10 views

### Average VIF after dummy variables [duplicate]

I have classified (label encoding) independent variables. To calculate VIF, I converted them to dummy variables. When I calculate VIF for dummy variables, there are VIF values for each class of an ...
54 views

### How to get most likely value with confidence interval or expected value from a set of observations

lets say I have a set of values (R-code below for creating a vector) ...
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