# All Questions

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### How to impute missing values not at random?

My data consists of 202 cases, each stand for a single interview. The variables reflect the interviewers' and interviewees' behaviours during four different parts of the interview: p1, g1, pA, gA. in ...
11 views

### Is a predictive model the best way to generalize about my current data?

Suppose I have a customer dataset. My independent variables are various types of customer attributes (age, where they live, gender, price of the item they are potentially buying) and my dependent ...
3 views

### What is the difference between the average class accuracy and average instance accuracy?

In some papers, I find some strange evaluation metrics that did not give a clear explanation, like average class accuracy and average instance accuracy! What is the difference between both? I can not ...
8 views

### How to analyze two variable from one sample

Data was collected from 150 patients with lower limb infections. There are 34 patients were newly diagnosed. For diagnosis purposss we used two tools A. HBA1C B. FBS Results 1. HBA1c High with ...
6 views

### TensorFlow: What is wrong with my (generalized) dice loss implementation?

I use TensorFlow 1.12 for semantic (image) segmentation based on materials. With a multinomial cross-entropy loss function, this yields okay-ish results, especially considering the sparse amount of ...
8 views

### A comparison of the global optimal binwidth and local optimal binwidth of the histogram estimator

Suppose we have $X_1, \dots, X_n$ to be an i.i.d sample with unknown pdf $f(x)$ and cdf $F(x)$, and define $\hat{f} (x)$ to be the histogram estimator. We also define its Mean Integrated Square Error ...
5 views

### EM Imputation and missing age data

I've completed an EM imputation to replace a small amount of missing data. One of the missing data was within my age variable (age range of 20 - 54). My question is... the new score that has been ...
11 views

### Can Kruskal-Wallis test be used in groups of different size?

I am trying to compare Likert-scale answers to a survey applied in 3 different cities: A, B and C. I arbitrarily chose twice as many respondents from A, for a total of 500 answered questionnaires in ...
8 views

### Comparing predictability of outcomes across leagues

From time to time I encounter newspaper articles with titles like “Unpredictable English Premier League Keeps Us Guessing”, which make claims about the difference in predictability of outcomes across ...
6 views

### Minimum population size for a comparison of treatments

Is there a rule for minimum population size for horticultural experiments and trials? For example, growing a plant variety in 5 different soil types in 5 different locations. My apologies if my ...
23 views

### Kolmogorov-Smirnov (ks_2samp) p-value not as expected - Wrong test or understanding?

Context I am using scipy's ks_samp in order to apply the Kolmogorov-Smirnov-test. The data I use is twofold: I have a dataset ...
22 views

### How can you measure probability with a regression model? [on hold]

Classifier-based machine learning models have a corresponding "confidence" associated with each prediction. How can you get a confidence measure for a regression model?
### When rolling a dice N times, what is the probability of an $X$ appearing before the last $Y$? [on hold]
So a valid state is when the lowest index of an $X$ is smaller than the biggest index of a $Y$. For example $N = 5$, $X = 1$, $Y = 2$ (Roll dice 5 times, 1 appearing before 2) 1 4 2 3 1 2 1 3 4 2 ...