# Questions tagged [computing]

For on-topic questions involving statistical computing. Please include also some statistical methods tag.

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103 views

### Transfer learning when Dropout in source model

Anyone can you pls help me to understand that. If we have dropout layers in between the convolutional layers of source model. When we do transfer learning from source to target model, the convotional ...
50 views

### Stable and efficient computation of binomial expectations

Suppose we want to compute the expected value of some function $f(X)$ where $X \sim \text{Bin}(n,\theta)$. Taking $\mathbf{f} = (f_0,...,f_n)$ to be the function values over all possible outcomes of ...
67k views

### Does Julia have any hope of sticking in the statistical community?

I recently read a post from R-Bloggers, that linked to this blog post from John Myles White about a new language called Julia. Julia takes advantage of a just-in-time compiler that gives it wicked ...
265 views

### Find true negatives in a confusion matrix

I'm trying to find the True negative in a confusion matrix, I have computed successfully from scratch the precision and recall/sensibility, now i need to compute the accuracy and specificity. This is ...
847 views

### Julia: Taking stock of how it has been doing

I came across a 2012 question that had a very good discussion about Julia as an alternative to R / Python for various types of Statistical Work. Here lies the original Question from 2012 about Julia'...
59k views

### How to sample from a normal distribution with known mean and variance using a conventional programming language?

I've never had a course in statistics, so I hope I'm asking in the right place here. Suppose I have only two data describing a normal distribution: the mean $\mu$ and variance $\sigma^2$. I want to ...
41 views

### Is it methodologically correct to, in some specific situations, merge related binary variables into one continuous?

I have 10 yes/no binary variables regarding different types of economic risks associated with running a startup. I have a database of around 100 different startup companies evaluated on each of those ...
414 views

### Symbolic computer algebra for statistics

What functionality should exist in a CAS that was specifically geared toward Statistics? Symbolic algebra systems like Mathematica and Maple are often used for calculus, logic, and physics problems ...
195 views

### Avoiding matrix inversions with the multivariate Gaussian distribution?

Let $(X, Y)$ be a Gaussian random vector with mean $\mu$, variance $\Sigma$ and both $X$ and $Y$ are vectors. No structure is assumed on $\Sigma$ (aside from being symmetric positive definite). Is ...
381 views

### Evaluating the hazard function when the CDF is close to 1?

I need to evaluate a hazard function $h(t;\theta) = \dfrac{f(t;\theta)}{1-F(t;\theta)}$, where $f$ and $F$ are a pdf and a cdf, respectively, at many values of $t$ (and for several values of the ...
5k views

### What books provide an overview of computational statistics as it applies to computer science?

As a software engineer, I'm interested in topics such as statistical algorithms, data mining, machine learning, Bayesian networks, classification algorithms, neural networks, Markov chains, Monte ...
25 views

### What role(s) does Statistical Computing / Computational Statistics play in Clinical Trials?

I am going to pursue a PhD in Statistics, and the two fields that I am really interested are Statistical Computing / Computational Statistics and Clinical Trials (mainly because I like doing ...
17k views

### Command-line tool to calculate basic statistics for stream of values [closed]

Is there any command-line tool that accepts the flow of numbers (in ascii format) from standard input and gives the basic descriptive statistics for this flow, such as min, max, average, median, RMS, ...
175 views

### In a neural network, how are weights adjusted between the third to last and second to last layer of neurons?

I haven't been able to find much information that explains back propagation in simple terms. I would like to know what is happening (what is the algorithm) to be able to code one in java. I know that ...
1k views

### Difference between pROC and ROCR in compute time and accuracy

I've been calculating receiver operating characteristic (ROC) curves on very large datasets for my thesis. I tried to run these in the pROC R package but the ...
49 views

### Computing new variable of nominal and scale z scores variables

I'm analyzing a set of data where participants' reaction time and number of errors made during the task were measured. As there were two trials (where same data was measured) I was thinking I could ...
11k views

### C++ libraries for statistical computing

I've got a particular MCMC algorithm which I would like to port to C/C++. Much of the expensive computation is in C already via Cython, but I want to have the whole sampler written in a compiled ...
215 views

### Why is a fully marginalized likelihood so much more difficult to computer than a partially marginalized posterior?

I have a question in terms of Bayesian computation. Let's contrast parameter estimation and model selection. When performing a Bayesian hypothesis test, this involves computing fully marginalized ...
122 views

### How to derive this version of variance formula

A probably very easy computational question, but I don't really understand how it's done: I try to compute the point estimates of a normal distribution as $N \sim (\beta, \sigma)$. Using the method ...
23 views

### Expected value of 3-repeated keys for a cuckoo hash table

I'm trying to solve a problem for my data structures class and am having problem computing the expectation for this scenario. I have wrote the question to be as independed from CS as possible I have ...
21 views

### Summarizing results obtained in different scenarios by different methods

I have generated different scenarios which depends on certain parameters $x_1, \dots, x_k$. I have evaluated each scenario with different methods. Summarizing, I have a value $S(m,x_1, \dots, x_k)$ ...