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25 views

### How can I generate a completely balanced combination

Attaching a code that generates unique combinations of 8 letters but, it still lacks a condition wherein all letters should have equal counts per column. For my code, basically, letter a to h should ...
35 views

### Validation Set Accuracy Significantly Higher than Hold out Test Set

I'm building a binary classifier, where each record is a task, and the response variable is whether it was completed on time. I'm using random forest My data set spans from 2000-2015 My hold out ...
29 views

3k views

### NbClust with large data sets. Sampling?

I have a data set which is 3 columns and about 50,000 rows. I am trying to do some cluster analysis and would like to speed it up. Most examples online use data sets like ...
72 views

### Is there a more efficient method for creating a probability distribution?

I have written a short function in R to estimate the expected number of mutations that will be observed in a set of DNA sequences. The parameters are the mutation rate (x), the length of the DNA ...
506 views

### Tests for quality of permutation (Y-randomization)

Can you please suggest the metrics/tests for accessing the quality of Y-randomization (permutation)? I have some doubts in quality of Y-randomization that I am using with sample.int from R. For 100 Y-...
295 views

### Subsample to follow a normal distribution

I have a problem, that sounds very simple in theory but I fail to implement a good solution. Let my data be a sample of a continuous variable that that follows a normal distribution (m1,v1), ...
4k views

### Importance Sampling to evaluate integral in R

I have asked the question here also. However, there might be something wrong with my theoretical understanding hence I'm asking here as it is more relevant. Kindly do not diss without looking first. ...
30 views

### Age-correcting survey sub-samples

I have a survey of N = 338 responses. If I analize the Age column, I can see that it is more or less normally distributed (mean =...