Refers to the interface of statistics and computing; the use of algorithms and software for statistical purposes.

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27 views

Why does the Journal of Statistical Software use The Persistence of Memory as a logo? [on hold]

I find this to be pretty interesting, does anyone know why this is?
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1answer
26 views

Studying complex systems (complexity)

Complex socio-technical systems is one my research interests. Since I plan to further study such systems and related phenomena, I've done a bit of reading and ran across various books, such as Bar-Yam ...
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10 views

What does it mean for a function to be “contained in” a confidence band?

So I have this problem that asks me to generate 100 random samples from a standard normal, and I did. It asked me to find a 95% confidence band and I did, using the Python code ...
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14 views

Standardization (z-score) across the “Samples” or across the “variables”?

I found in literature that one of the most common way of standardization data is to compute z-scores (mean subtraction and division by standard deviation). Can anybody tell me if it is ok to compute ...
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23 views

which test should I apply to find which model is significantly different? [closed]

I have two questions 1- regression I have performed many regression models (10 models) and therefore, I have 10 prediction columns and one column or more for my real data (independent variables) ...
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1answer
39 views

Computational complexity for linear discriminant analysis

The linear discriminant analysis algorithm is as follows: I want to conduct a computational complexity for it. For each step, the complexity is as follows: For each $c$, there are $N_cd$ ...
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18 views

Z-score across the “Samples” or across the “variables”?

I found in literature that one of the most common way of standardization data is to compute z-scores (mean subtraction and division by standard deviation). Can anybody tell me if it is ok to compute ...
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1answer
22 views

Why my code error? find call value in R code [closed]

this is my code whats miss? Im confused why my code error please help me this code like black-scholes but in geske formula Values Call = VT1*N(d1)-K2*exp(-r*(T2-T1))*N(d2) N=distribution normal ...
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1answer
58 views

A Simple Regression Model for Our Experiment? [closed]

We know, In statistics, simple linear regression is the least squares estimator of a linear regression model with a single explanatory variable. In other words, simple linear regression fits a ...
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1answer
69 views

uniform distribution with density function? [closed]

If $0.3,0.2,0.8,0.3,0.4$‌ are found from one random instance with uniform distribution with following density function, We need to find $\theta $ estimate with Method of moments. how should we do ...
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1answer
141 views

Do I need to be a mathematician to be more than an expert in machine learning? [closed]

Machine learning has its roots principally in mathematics so if I wanted to be not only an expert but an innovator in this area would I have to be a computer scientist or would I need to be a ...
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2answers
32 views

Testing if distribution is similar between two groups

I have a variable young that is equal to 1 if a participant is less than 25 years old. I then have a list of of each ...
5
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1answer
35 views

Pitfalls in Fitting Nonlinear Models by Transforming to Linearity

Some nonlinear models can be transform to linear models. My understanding is that there might be one-to-one relationship between the estimates of nonlinear model and its linear model form but their ...
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0answers
6 views

Formula to rate a survey

I conducted a survey. 30 people responded. It had 7 categories, all an individual had to do was rank each category from 1 to 7, using each number only once, 1 being the most important and 7 being the ...
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1answer
28 views

What statistical test to use?

I would like to ask your advice regarding the statistical tools that can be used in analyzing two different kinds of data where I have to determine if there is an association between them. For ...
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0answers
24 views

divide among the use of statistical software package [duplicate]

Most of the application done by professionals, may it be in finance, economics or other industry is done in either R, SAS or Python. From what it looks like, most of the application in industries in ...
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0answers
8 views

Confidence Interval for mean difference with non-mutually exclusive 1 to many matches in R

This is somewhat both a programming question, and a stats question. So sorry for the overlap (although it seems that there is a large overlap between the realm of stats and programming of ...
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0answers
18 views

Model choice for discrete data with R

I'm keen to model the effect (impact) of variable i.e. var1 and its effect (causation inference?) on var2 given the score measure. Sample data (variation of data I have got) ...
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2answers
1k views

Mathematica's random number generator deviating from binomial probability?

So, let's say you flip a coin 10 times, and call that 1 "event". If you run, 1,000,000 of these "events", what is the proportion of events that have heads between 0.4 and 0.6? Binomial probability ...
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0answers
27 views

Scoring model/formula to rank based on accuracy of data sources

Let us say i have 5 different data sources. My aim is arrive a score to arrive the accuracy of this data sources. It is like below 1. Refer the section Data confidence calculation in ...
3
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1answer
97 views

Estimate mean & standard deviation of set S if I know stats of an inner set and outer set

Suppose I have sets $S_1\subset S_2\subset S_3$. I know exactly the size, mean, and standard deviation of both $S_1$ and $S_3$ and want to estimate the mean and standard deviation of $S_2$, where I ...
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0answers
30 views

What is first order asymptotic distribution?

I am stuck with this term in a research paper(Hansen, 1999). Its written (p 351) "Hansen (1996) shows that a bootstrap procedure attains the first-order asymptotic distribution, so p-values ...
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0answers
34 views

What are the quantitative methods alternative to Meta-Analysis?

What are the alternative statistical quantitative synthesis methods for combining studies, if we can't apply meta-analysis because of the heteronegeity or the shape of the data, for the data set of ...
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2answers
63 views

When is calculating probability based on a poisson distribution preferred over a binomial distribution?

I'm trying to understand why a poisson distribution may be preferred over a binomial one when modeling binary cases. Is there a case where you can't use a binomial distribution to solve a problem ...
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1answer
84 views

Find the expectation and covariance of a stochastic process

The problem is: Let $W(t)$, $t ≥ 0$, be a standard Wiener process. Define a new stochastic process $Z(t)$ as $Z(t)=e^{W(t)-(1/2)\cdot t}$, $t≥ 0$. Show that $\mathbb{E}[Z(t)] = 1$ and use this result ...
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2answers
38 views

Hierarchical Gamma-Poisson CDF?

What is the most computationally efficient way to evaluate the CDF $$P(X \leq x | r,v)$$ where $$ X \sim Poisson(\lambda)$$ and $$ \lambda \sim Gamma(r,v)$$ I can't see the next obvious step after ...
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1answer
61 views

Which statistical melhods could I use to determine if a price is good, based on a history of prices?

I have the following scenario: A history of prices of a specific product; The current price of the same product. The history of prices should contain prices with a certain amount of discount, very ...
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2answers
72 views

How to validate if a sample is independent and identically distributed

How can I check if the data is drawn i.i.d. from an unknown multivariate distribution?
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1answer
50 views

Similarity scoring to compare multi-dimensional datasets

I am trying to come up with a mechanism of scoring a set of multidimensional datasets based on a similarity with an ideal dataset. Each dataset will all have the same dimensions along with the ideal. ...
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75 views

R - system is computationally singular - dealing with small numbers

I'm working with a ~200x200 Markovian transition matrix of non-zero probabilities. Forcibly, these probabilities are, for the large part, going to be very small. I am trying to find the inverse of my ...
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12 views

Can one fuse graphical and quantitative techniques?

The NIST Engineering Statistics Handbook provides a great compendium of graphical and quantitative techniques. Every technique (graphical or quantitative) is usually explained with a set a questions. ...
3
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1answer
24 views

Data rescaling for a more informative heatmap?

I have a 2000$\times$2000 matrix of values. Over half of the values are 0, and for those non-zeros, most of them are less than 10, but the maximum value is 140. So when I do a heatmap, it looks like ...
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32 views

propagation of the error in the summation

I have a question regarding the propagation of the error during the summation. Please see the equation below. In this equation only quantity R has an error. How it will propagate to the final value ...
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1answer
44 views

What is the distribution of $X$ since $X|Y \sim \mathrm{Bi}(Y, p)$ and $Y \sim \mathrm{NB}(r, q)$?

I have done the usual steps to calculate the marginal distribution of $X$, i.e. using the following formula: $$p(X) = \int p(X,Y) dY = \int p(X|Y) p(Y) dY$$ Therefore, it holds: \begin{align} P(X=k) ...
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5 views

For an ANOVA comparing here treatment condition

a) None of these choices is correct. b) All three of the population means are different from each other. c) At least one of the three population means is different from another mean. d) There are no ...
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29 views

Convergence Time of the EM Algorithm Depending on the Inital Parameter Values

I try to get an intuitive understanding of the convergence properties of the EM-Algorithm. I wrote a code that does the following experiment. We are given three coins: $H$, $A$ and $B$; with ...
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1answer
41 views

measure for jobs/complaints ratio

I have a number of jobs in a database which can receive complaints. A job can receive several complaints and a job has an associated supplier. I would like to identify the worst performing suppliers. ...
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23 views

selection of features with Weka

I have a question and I hope that you can help me: I have a bilingual text(source language and target language). I extract from this text the best source phrase and the target phrase related to this ...
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165 views

Is it correct or not I applied PERMANOVA-test and interpreted results?

I want to associate nutrients with microbiota bacteria composition. My data consist of two tables: nutrient table (row - patients, column - some of nutrients, e.g. protein, calorage); bacterial ...
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28 views

Sampling Size for a large Dataset

I am having a dataset of size upwards of 200 million rows. I have no knowledge of the distribution of this dataset. Would like to perform some analysis on this - like look at the ...
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25 views

What statistical analysis to use?

What statistical analysis should I use if I have 2 groups of subjects (high and low comprehenders) which are divided into 3 subgroups according to text genre (poetry, short story, drama) and subjected ...
2
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1answer
211 views

Area within a given number of standard deviations from given mean

I have a variable with mean value of 18.85 and standard deviation of 1.45. I want to define the area that is covered by 1.45 standard deviations left and 1.45 standard deviations on the right side ...
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30 views

Fast way to compute central moments of a Poisson random variable?

I am looking for a way to quickly compute the central moments of a Poisson random variable. I've found a couple of resources on how to compute the central moments, but I'm still trying to figure out ...
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7 views

how do i differentiate between alternative specific and alternative invariants using sas?

Okay so my level of expertise in statistics is fresher/rookie. I am trying to predict the the outcome of categorical choices for a product category y (3 choices or 3 flavors of cereal for example). ...
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1answer
53 views

What statistical analysis should I use for my study?

In my psych class we were testing to see if groups of men or groups of women would be more helpful in an emergency situation (we are testing for the bystander effect), and we are testing to see if ...
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0answers
24 views

Matching sets of 3d position data

Imagine a cube filled with air and ~5000 levitating potatoes. The distance between two poatatoes are usually at least an order of magnitude larger than their volume and their distribution is pretty ...
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0answers
24 views

When is appropriate to combine two treatment groups from one study into a composite whole for a meta-analysis?

The treatment groups I would like to combine appear to be virtually the same, at least by generic label for each group, e.g., groups with the same treatment but implemented at different sites or ...
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16 views

Need Insight on Measuring Variable Effect

I apoligize in advance for the wall of text. I'm working on a project in which I have been asked to determine what factors influence employees leaving our company. Also, it would be useful to be able ...
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0answers
33 views

Aggregate variance for ordinary least squares?

I am writing some MapReduce code to calculate ordinary least squares from a sample of data. I'd like to include standard error, but I am running into a problem in calculating the variance of the ...
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1answer
64 views

Outliers In Predicted Intervals

In my stats class today, the professor was showing us some output from MINITAB on a prediction interval that was calculated (from time series data). For one of the prediction intervals, MINITAB had an ...