# All Questions

2 views

### Statistical test for comparing two response options in the same survey item

Is there a way to determine whether the proportion of respondents that endorse one response option of a question is different than the proportion of respondents that endorse another response option of ...
2 views

### Adapting clustering to partial clutering

This is a question primarily about re-appropriating existing clustering methods to work when only a fraction of datapoints are likely to originate from a cluster (as opposed to a global background ...
10 views

### Practical exercise to solve SVM and logistic regression

I have a simple task regarding SVM and logistic regression, even though I know the theory behind SVM and logistic regression I still have a problem to solve them. Exercise. We want to learn a ...
6 views

### What are the differences between filters learned in autoencoder and convolutional neural network?

In CNN, we will learn filters to produce feature map in convolutional layer. In Autoencoder, each layer's single hidden unit can be considered as filter. What the difference between the filters ...
49 views

### Machine learning classifiers

I have been trying to find a good summary for the usage of popular classifiers, kind of like rules of thumb for when to use which classifier. For example, if there are lots of features, if there are ...
10 views

### How to perform a regression with orthogonal polynomials (such as laguerre) in R? [on hold]

Using R software, I'm trying to perform a polynomial regression on E(Y|X1, X2, X3). In fact, E(Y|X1, X2, X3)must ne equal to a linear combination of polynomial with orthogonal basis (such as Laguerre ...
6 views

### Sample size and power calculations for a randomized controlled trial

I need help with the power calculations to determine the sample size of a randomized clinical trial. This is a relatively simple trial with two arms: an intervention arm and a control arm. Patients in ...
17 views

### One-way repeated measures ANOVA vs. two-way ANOVA

In a balanced repeated measures one-way ANOVA, we compare the true averages of a response variable across time points. Are the results about the time effects equivalent to those from a classic two-way ...
9 views

### Within-group sum of squares of cluster

I have a multivariate dataset for which I have only a table including the cross-wise Euclidean distances between all points and a list giving the assignment of each point to one of several clusters. ...
18 views

18 views

### Simulated chi-square distribution doesn't match theoretical

Can someone explain why the distribution of Chi-square values I'm getting (using Pearson goodness-of-fit test) doesn't match the expected Chi-sqaure distribution? The test seems in this case to be ...
7 views

### Implementation of Loopy Bayesian Networks in R or python? [on hold]

Is someone aware of some coded examples of Loopy Bayesian Networks (preferably in R, python or Matlab)?
6 views

### What makes a good test set in an unbalanced corpus?

So, I have a machine learning classification problem, where the classes are quite unbalanced in the initial annotated dataset. My idea is to use Bootstrap method to help the classifier get new ...
4 views

### What is an intuitive explanation of Echo State Networks?

A reference can be found here: http://www.scholarpedia.org/article/Echo_state_network I am new to Recurrent Neural Networks(RNN) and still learning the concepts. I understand at an abstract level ...
6 views

### Correlation between balance of binary division and modularity in a social network

I'm working with social network data where the full network can be divided up into a ~30 subgroups of nodes based on existing organizational divisions. I'm interested in how integrated each of these ...
12 views

### Fitting a model while adjusting for some variable

I plan to figure out the effect of variable X on variable Y. I have time series data for both X and Y and a simple regression model should do the job. Unfortunately the variable Y is also affected by ...
13 views

### Searching for signal in a somewhat noisy landscape

I'm trying to implement a system to identify regions of high signal content in the presence of a noisy landscape. By high signal content, I simply mean intensity values significantly above background ...
9 views

### Multicollinearity as interaction terms added: Separate or common analysis?

Using OLS, the starting aim of my analysis is to study how different types of credit card contracts affect the dependent variable (y: use of credit cards). I have generated three dummies (v1, v2, v3) ...
6 views

### What is the sampling distribution of alpha parameter of Lomax distribution?

I have found MLE estimate for . Now I need to find sampling distribution of , does anybody know?
4 views

### Output's probabilities of ANFIS in MATLAB

Is anyway to have output probabilities of binary classification using MATLAB ANFIS toolbox (or other related toolboxes)? Outputs are 1 and 0. So if we have 0.7 for ...
5 views

### Is dunn.test a suitable alternative to kruskalmc in pgirmess package?

I'm trying to run the krushkalmc method after running kruskal.test as part of my analysis with the Kruskal-Wallis rank sum test. I have data with a small sample size that also does not have a normal ...
17 views

### Is the model consider as panel data equation [on hold]

i have 4 model as below and dependent variable i use t for model 1,3,4: Model 1- CR t = PROFITit + ASSET it + GDP t Model 2- PROFIT it = CR t +ASSET it + GDP t Model 3- CR t = PROFITit + ASSET it + ...
23 views

### Distribution of estimator

Some help would be appreciated on this one. There is something I can't get around my head. Let's suppose we havfe $ln x$ that is following a Normal distribution of parameter \$lnx\rightarrow ...
8 views

### analysis after Gregory-Hansen cointegration test

I have two time series which fail E-G cointegration test over the whole sample, but G-H cointegration test indicates the presence of cointegration when regime shift is allowed. Can I set up a dummy ...
8 views

### Estimate total number of errors from a sample of independent error probabilities

I have a dataset in which I have linked clients by their name and date of birth. I want to estimate the number of errors this will create, i.e. the number of times I will incorrectly assign as 1 ...
15 views

### clustering discrete data - how to get “autocorrelative distance” matrix?

I'm trying to cluster discrete (histogram) data with unequal bins. I came across the post: Clustering distributions and calculated the cumulative sums of each data set and interpolated between ...
16 views

### How to draw a representative sample from a biased portion of a sampling frame?

I have a question concerning sampling. We are planning a study in which we aim to draw conclusions about the relationship between different sources of research funding and academic impact (measured ...
3 views

### contrasts between two grouped levels and the other six levels in a mixed 3x3 ANOVA in SPSS

I have a mixed ANOVA with 3 between subjects groups (control, m, s) , and 3 within subjects factors of stimulus type (3 levels), orientation (4), eccentricity (8 levels). i would like to investigate ...
4 views

### Contribution of a sample to cross validation error

I was wondering how to asses which sample in the data, during K fold cross-validation drives the bias that may be observed in the results. My training data consists of 40 samples. And I try to ...
14 views

### map pca eigenvalues to original matrix' columns

I am unsure if this questions is valid mathematically speaking, but I am wondering if it is possible to map the eigenvalues that prcomp returns with the original columns... meaning... if my matrix if ...
9 views

### How to compensate for a small dataset in analysing social media performance?

I work on an online news site, and we're doing some analysis on our articles' potential for success on social media. We hope to get a better idea which of our articles will go viral. As well as data ...
15 views

### How do you assess data validity when sample size varies over time

Imagine that you have a customer feedback system where after a process people can press one of 4 buttons: (very happy, happy, sad, very sad) and an aggregation system reports how many people per hour ...