# All Questions

4 views

### How can you detect outliers in a group of face images?

I'm trying to filter an image database which contains some irrelevant pictures. All the faces are labeled with points around the face contour, eyes, mouth, eyebrows, have age and gender. The faces are ...
10 views

### Sample size calculation, linear regression

I have just had my viva and my sample size calculation was criticised as it was based on r2. I was told to base the sample size on the minimal magnitude of association. My outcome variable is HbA1c, a ...
14 views

### Getting Expected Value from Monte Carlo Simulation

There are two independent uniform continuous random variables $X$ and $Y$ (such that $0 \leq X \leq 10$, $0 \leq Y \leq 10$). The function $f$ is the difference between the two random variables ...
12 views

### Statistics in Agronomy

I'm looking for good references, textbooks or survey papers on the application of statistical methods in agronomy, farming or food industry. Anything related to these domains in terms of modeling, ...
3 views

### Training and Activating a 2 layer deep network

I've been working with synaptic.js to make neural-networks in the browser for a while and I've decided I want to implemented deep-learning for a project I'm working on ( connecting an lstm to a ...
7 views

### 2SLS causal effect interpretation

I would be very grateful if someone could help me to interpret 2SLS results produces in R. In particular, I am interested in the result on causal effect. I want to know whether it is CC that affects ...
6 views

### Regression imputation of missing data based on OLS effects

Let's say we have a two-way with interaction experiment with missing data. Being the dataset: ...
2 views

### Resouces, tutorials or courses for data/text manipulation [on hold]

Online and free course or complete tutorial for data/text manipulation?
6 views

### multivariate general linear model

If I want to test if losing control over eating during pregnancy (my independent variable) can predict birth weight (dependent variable) and to do that I did general linear regression. Now if I want ...
7 views

### what exactly is projected gradient descent?

I am reading the article with title "metric learning by collapsing classes" http://papers.nips.cc/paper/2947-metric-learning-by-collapsing-classes.pdf.There are some questions which has bothered me ...
3 views

### Choosing a tech stack for data/text manipulation [on hold]

What is the most powerfull technonology stack for huge data/text manipulation, python, R or Bash tools (sed, awk, cut, tr, etc). What are the pros and the cons of which one?
3 views

### Test If Mean Probability > 0 In Binomial GLM

MacOSX 10.9.5, R v.3.1.0 How can you use a binomial GLM to test whether the mean probability of an event is greater than 0? Here are some data: ...
8 views

### time series forecast problem

i have a resaerch in forecasting population size in my country by using exponential smoothing method, my data was for six years, for several states, i used spss program and used time series analysis, ...
14 views

### Interpretation of coefficients in linear regression: first difference of logs

what is the correct interpretation of coefficients in time series regression when using first differencing on logs of the DV and in certain IVs. FD(lnY)=c+beta1*ln(X)+beta2*FD(lnZ) The log ...
3 views

### What is the mathematics behind the GAM prediction intervals?

From the R gam function available in the gam and mgcv package there is the option to obtain ...
34 views

### Why does drawing one card at a time increase the probability of choosing the Ace of Spades?

If you draw 5 cards from a standard deck of 52 cards, then the probability of your hand having the Ace of Spades is: $$\frac{51\choose 4}{52\choose 5} = \frac{51!5!47!}{4!47!52!} = \frac{5}{52}$$ If, ...
32 views

### Is nominal, ordinal, & binary for quantitative data, qualitative data, or both?

I'm getting wrapped around data types and I need some help: If you look at the picture above (taken from here), it has the data types like this: Quantitative (Discrete, Continuous) Qualitative ...
15 views

### How to do an analysis of variance?

I ran an experiment in which probands had to rate (1 = dislike, 2 = like) how much they liked each of five fruits (apple, peach, orange, banana, strawberry). I now have results: ...
17 views

### Strictly Stationary Time Series with Infinite Moments

Can someone give me an example of a strictly stationary time series with infinite moments? I am reading a book on Time Series by Wayne A. Fuller where it is said that a strictly stationary time series ...
10 views

### Clustering Standardized Mortality Ratio

I am bit new to the whole clustering idea. I have a data set that gives information about the SMR in the different states of America from 1995-2000. Hence I want to apply clustering techniques ...
8 views

### Fixed effects regression using sex as the unit of analysis

I have time series data for 10 time points for both males and females. Would it make sense to have sex as the entity in the panel approach?
25 views

### Non parametric analysis

The my dataset is not normal distributed. In order to apply a non parametric analysis, exist only the Kruskal Wallis test or others? I need to find a test similar to ANOVA to apply a dataset not ...
28 views

### What is the best way to test normality for a very large sample size 15000? [duplicate]

Also do I need to test the normality for the categorical data? Thanks
14 views

### Gaussian processes - Covariance matrix is not positive definite with SE kernel [on hold]

I am trying to implement the simplest example of a Gaussian process in Matlab. I want to draw samples from a prior distribution. Also I want to use the Squared Exponential kernel. Unfortunately the ...
10 views

### Non-vector data and SVM?

My research is on antimicrobial peptide classification and prediction. I have gathered peptide sequences of lengths ranging from 10 - 200 and classified them using different machine learning ...
7 views

### Distribution of trace of the covariance matrix

I try to implement a two stage procedure for a multidimensional confidence region with a fixed shape regarding to the handbook of sequential analysis (Ghosh 1991, p. 33ff). To do that, I have one ...
6 views

### Recommended Study Area For Processes

I am looking for a machine learning area that deals in processes for logistics. If anyone can show me some use cases or even point me in the direction of a couple of algorthims. Im currently using R ...
33 views

### Observed Vs Unobserved Variables [duplicate]

Can anyone explain the difference between observed variables and unobserved variables (preferably in plain English ) ?
7 views

### GP regression - Matern kernel gradient issue

I'm trying to use a Matern 5/2 kernel for GP regression, so my kernel function is $K(x,x')\triangleq\theta_0(1+\sqrt{5r(x,x')}+5/3r)\exp(-\sqrt{5r}),$ where \$r(x,x')\triangleq\sum_{d=1}^D ...
19 views

### Complement of statistical significance test

I am applying statistical significance tests like the Kruskal-Wallis, Wilcoxon and ...
17 views

### Data splitting using kennard stone [on hold]

I would like to use kennard stone algorithm for splitting a dataset into training and test set. Does Weka /Rapidminer/any free software with GUI has a feature to do this? If so, would like to know the ...
15 views

### Calculating Cumulative Hazard Function [on hold]

Why are not hazard.km and quantile.km functions working in R ? ...
10 views

### How to check if the data follow a certain Conditional random field model

I have certain data for which I think that there is a relation between neighbouring points given certain features. However, I don't know how to get intuitive plot that shows this relation. I checked ...
9 views

### Is there an algorithm for independent component analysis without whitening

I am looking for ICA algorithms that do not require whitening step during pre-processing. Any papers or algorithms available? Thanks Quant
42 views

### What property of logistic regression is useful for modeling user behavior? [on hold]

I want to know that what property or attributes of logistic regression make it to useful for modeling user behavior.
24 views

### What is similarities and difference between statistical inference and hypothesis testing?

What is similarities and difference between statistical inference and hypothesis testing? I am confused between those
13 views

### Hierarchical Bayesian Regression with an Indicator Variable, one group has all zeros for the IV Variable

I'm attempting to form a Bayesian Hierarchical Regression Model and one of my regressors is for an indicator variable. My hierarchy structure has separate group-level regressors related across-groups ...
40 views

### Recommendation list of books for hypothesis testing?

Recommendation list of books for hypothesis testing? More precisely, i need list of standard theoretical textbooks that focus on hypothesis testing used in US graduate schools and these books are ...
24 views

### What is the name of subject for testing which distribution the set of data follows?

What is the name of subject for testing which distribution the set of data follows? I become frustrated since I am a beginner in this area.
86 views

### Goodness of fit. How to evaluate if polynomial of order n+1 gives statistically better fit than polynomial of order n?

I fit polynomials with increasing order to some data. What is the best way to evaluate if the additional parameter of polynomial of order n+1 provides a statistically significant better fit than the ...
11 views

### Conceptual Question On the application of Radial basis function in a paper

I am struggling with the concepts of using Radial basis function using radial basis neural network function in the application of modeling a PRBS signal sequence generated from a non-linear system. ...
10 views

### Constructing a normal probability plot template in Excel [on hold]

How can I create a blank normal probability plot template in Excel? I need to use a paper version in a very rough atmosphere. There is a blank example at this website which I like. ...
11 views

### ANOVA table help

I need to find values for the starred values. I have been trying for some time but cannot figure out how to find them. I was able to find the Degrees of freedom, F and Significance of F. I have no ...
7 views

### stationary and coefficient of variation [on hold]

I am going to use coefficient of variation to monitor a process, then my problem is that this coefficient is not stationary, so i did log transformation using Sewall Wright (1952) how showed the ...
14 views

### What are some good (and fast) alternatives to dynamic time warping?

I am planning to cluster tens of thousands of time series of different lengths into two groups.
8 views

### How to find if any treatment is statistically better or worse in gene data given one standard method and 3 variations

Sorry I am a biologist and it appears am not quite confident enough for statistical analysis. I have datasets that represent different treatments on a biological system. It records how many genes have ...
7 views

### cross validation for cart

When a dataset is given and it is divided into N parts, training a Cart on N-1 parts and testing it on the remaining part (and doing that N times, i.e. for each possible leave-out), one ends up with N ...
12 views

### Potential setup for Differences-in-Differences and self-reporting data?

Here is the background. I have two datasets of non-profit organisations in an African country in 2005 and 2010. In 2005, there was a small portion of the organisations active in malaria-related ...
According to Hinton's slides (slide 34) the following relationship holds for Boltzmann Machines in thermal equilibrium: $$p(v,h) = \frac{e^{-E(v,h)}}{\sum_{u,g}{e^{-E(u,g)}}}$$ To me this is not ...