Questions tagged [computational-statistics]

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

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Time complexity of the EM algorithm

this is Fuzzy Relational Eigenvector Centrality-based Clustering Algorithm (FRECCA). Here, N = total number of data, C is the number of clusters. Link of this algorithm is here For line 1-10, time ...
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1answer
86 views

What is Normalization across samples and Normalization across genes mean?

Can anyone tell me what does normalization across samples and normalization across genes mean statistically. What is the exact difference between the both? Thank you
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15 views

Test multi-regression models and combine both after testing every model separately

I have two regression Models: the first model with one dependent variable (Logarithm of income), one independent variable (Percentage of a proxy), and four control variables with datatype (nominal, ...
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1answer
84 views

Estimate the variance of a model using only the test score

This class on Coursera from Andrew Ng. Class on Learning Curve shows that high variance could be inferred as a high gap between the training and test score. However, I was wondering if we can get a ...
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16 views

Multiple same event samples, noise elimination algorithms?

In the case where I have multiple samples of the same event, but they are very noisy, thus rather obscuring the curve/trend (or at least making it incredibly ugly and confusing), what is my best bet ...
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1answer
69 views

How to obtain the minimum number of individuals needed to estimate a character frequency

I have 150 individuals coming from the same population. I want to know what is the minimum number of individuals I need to estimate the frequency for ~1600 different characters. Each character can ...
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46 views

Quantify an interaction variable in a multiple linear regression?

I have a dataset with the following continous variables (TV views, Email, Online videos, banners, direct mail, search). I have impressions and conversion of impressions to application of all those. ...
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1answer
33 views

Evaluate Difference Between Groups over Time

It's been awhile since I've taken statistics, so forgive the simple question. My company is attempting to evaluate the effectiveness of a training we've developed. We have teams spread throughout ...
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1answer
88 views

System with two Dependent Variables: One binary and one categorical with 4 categories

My data has around 5,000 clients who are admitted to treatment/recovery services. I have two Dependent Variables. The first Dependent Variable is treatment outcome ("was the treatment successful?&...
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1answer
47 views

MLE for model parameters of a bivariate random variable sample with a given density function

so this is a statistical computation question. I have a data sample (X,Y) and a given density function of this sample that depends X and Y given mean of X, mean of Y and theta. I need to run an MLE ...
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97 views

Measuring multi-dimensional array similarity

I have several multiple dimensional (1364x6) arrays which are gathered using a sliding window over a fixed size image (the values are mean of the intensity in each of the channels). ...
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30 views

How to work this sample survey problem out?

Suppose in a country there are $N$ states. You select by simple random sampling without replacement (SRSWOR) $n$ states where $n<N$. Now assume for each $i=1,2,...,N$, state $i$ has in total $K_i$ ...
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43 views

What tests to analyze the following hypotheses with nominal data?

I have a set of questionnaire data to analyze the working culture for respondents. (There are four existing cultures; a,b,c and d) Variables including Gender, Organization, Public/Private Sector, ...
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2answers
685 views

How to interpret SPSS p-value for one tailed tests

Suppose H0 = Mean 1 - Mean 2 > or = 0 and HA = Mean 1 - Mean 2 < 0. We do an unpaired t-test in SPSS to get our p-value. The SPSS p-value is 0,534. This P-value is two tailed, so we have to devide ...
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51 views

Scalability comparison with the help of regression

I created an algorithm and I tested it against a current algorithm. The results are in this form: ...
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21 views

AVERAGES OF SETS

Am not really sure whether its handled in this field;but my question is: Suppose there are different sets of random numbers provided. Each set has exactly 16 digits ranging from 0 to 9,all randomly ...
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1answer
35 views

Confidence Intervals And Probability Mean Is Not Closer To Tails

I'm curious if there's a good way to estimate the probability that the true mean of a population falls closer to the observed sample mean than the tail ends of the margin of error. That is, I believe ...
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24 views

What is the best way to analyse data comparing one by one and stipulate the accuracy?

Follow the example: The first line is the data I got. The second line is the target data. | 154.0 | 784.4 | 854.1 | 789.3 | | 153.5 | 789.7 | 892.3 | 903.2 | I ...
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257 views

How to determine correlation between sets of integers

How would I determine a correlation between sets of integers such as the following: set A: 1, 2, 3, 4 set B: 2, 3, 4 set C: 4, 5 set D: 2, 5 I want to have a ...
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362 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 z-...
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1answer
53 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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32 views

Better calculation of ends of the curve when using R's RandomForest?

I've been using R's randomforest library to predict a series of (2000) products with prices ($10-$2000) and I'm noticing the low and high ends of the continuum are least accurate, especially when I ...
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1answer
58 views

Alternatives to absolute error?

Let me explain my scenario in which I need to calculate absolute error. Lets say the X is the actual value. And X' is the value of X with some error 'e'. So X' = X + e'. Lets say i = 1 to 10000. I ...
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424 views

Fitting multiple logistic functions at once with pymc

I have read a similar post here Fitting logistic function with pymc but it seems there is a rule that I shouldn't ask question in someone else's post. My approach is to fit 10 logistic functions to ...
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312 views

Distance between nominal vectors: a review

I have a seemingly easy question which however is troubling me a bit. I have couples of vectors made up of nominal attributes. They can be of different length and sometimes some of the attributes in ...
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1k views

Mixture model and Pymix (python package for mixture models)

I have a data set that behaves approximately Standard normal. It is an image where each observation is a pixel intensity. I want to cluster this into three different sets by fitting a 3-gaussian ...

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