A measure of the degree of linear association among a pair of variables.

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6 views

Discovered i have modelled an equation - what do i need to be aware of

With a dataset i have it turns out the output is an equation of three inputs. Y = (X1+X2-X3) /(X1+X2) This has presented itself to me where these 3 inputs can ...
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7 views

How to down weight correlations in my microarray analysis?

Background: I have been tasked in one part of my analysis to reproduce a method used in another study as follows in bullet points form: Microarray data from a number of time points Calculate ...
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28 views

Classification using correlation

Given two correlation matrix (each $p \times p$), where each belongs to a different group, is it possible to classify a new sample into one of the group (based on the correlation matrix only)? What ...
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15 views

One independent variable and many dependent variables [on hold]

My independent variable is (CEFFAS) Community Education for Family Formation via Alternating System. My dependent variables are Entrepreneurial Capacity such as Risk Taker; Competitive; Innovative; ...
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10 views

Point Biserial correlation coefficient in Java

I've recently installed Apache Commons Math library to help me with some basic statistics in my project. Basically, what I need is to calculate the correlation coefficient for 2 arrays, which I can ...
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18 views

correlation between factors

I am new to statistics and SPSS. I have a questionerre having 30 likert scaled questions, and 5 factors each having 5 or 6 questions. I made the reliability analysis and no problem is found. all ...
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1answer
36 views

Counter-intuitive correlations vs. observed proportions

I'm confronting something pretty weird. I've got a household-level dataset, and I want to calculate the correlation between a binary variable A (taking values yes (2) or no (1)) and whether the ...
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0answers
12 views

Statistical test to measure correlation between inter-rater mistakes

I'm working on a project that involves collecting crowd-sourced labels for discussion forum posts. The task given to annotators was to look at a forum post and to decide which of six classes the post ...
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17 views

How to get correlation between two categorical variable and a categorical variable and continuous variable?

I am building a regression model and I need to calculate the below to check for correlations Correlation between 2 Multi level categorical variables or 2 binary variables Correlation between a Multi ...
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1answer
18 views

Correlation between predictor variables in an AIC model

I'm using multinomial logistic regression analysis to analyse deer behavioural responses to camera traps based on 7 predictor variables. I have 2 models which are very close together in AIC value ...
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2answers
28 views

Tool for generating correlated data sets

Does anyone know of a tool that I can use to generate a set of data with known correlations (and to put the icing on the cake - output this in json,csv,txt or some common format)? I am working on ...
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17 views

Can I convert my likert scale to numbers and then take an average in order to know if there is a correlation between two variabes?

I need some help about some data. I have an indicator of performance and a likert scale. Would it make sense if I assigned a value to each category on my likert scale (ex.: ...
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1answer
47 views

How can I test if there is a correlation between a score and a likert scale?

I'm having difficulty finding out what I can do with my data set. It comes from a french reading test that have 30 multiple choice questions. For each of these questions: I have the facility value ...
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1answer
62 views

how does the correlation of independent variables affect the correlation of parameters

Suppose $Y$,$X$ and $Z$ are correlated random variables with $N(0,1)$. We have these cross-sectional regression for each time $t$ $Y_{t} = \beta_{t}X_{t}+u_{t} $ $Y_{t} = ...
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6 views

How to analyze this design? Multiple batches of Single group pre-test post-test designs

first of all - thanks for reading this. I have a want to analyze the effect of an intervention, but due to practical circumstances I cannot randomly assign people to it and the interventions differ ...
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0answers
10 views

Power to detect significant correlation given measurement uncertainty

First of all, apologies if some of the technical terminology in here is not accurate - my experience with statistics is fairly limited. To illustrate my problem, let's say I wanted to design a study ...
3
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2answers
71 views

Interplay of Categorical Data

I apologize if my phrasing is un-educated, I don't have much of a stats background. I'm struggling to find info answering my question because I lack the terminology to accurately describe it. Let's ...
2
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0answers
28 views

Co-occurrence statistics for sets

I am looking for help in the following situation: I have a set of numbers $A=\{1, 2, \dots, 100\}$, and I am drawing subsets of 10 of these numbers $\{a_1, a_2, \dots, a_{10}\}$ according to an ...
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0answers
9 views

Correlation coefficient for Boolean data [duplicate]

I have a data set consisting of a number of variables: all are Boolean true/false type. Can I simply count the R correlation coefficient between two variables substituting 0 and 1 to get correlation ...
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0answers
26 views

How to make a distance correlation matrix? [closed]

I'm searching for a method or an existing package to calculate the distance correlation matrix. The package 'energy' seems only able to calculate the distance correlation between two samples. I ...
2
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1answer
59 views

Is it reasonable for a classifier to obtain a high AUC and a low MCC? Or the opposite?

Let's say I have 2 models: 1) High Matthew's correlation coefficient (MCC) score, low area under the curve (AUC) 2) Low MCC, high AUC When I say high and low, I mean relatively to the other model. ...
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52 views

How to develop a prediction model based on correlation in R?

I have two sets of data, say sales and profit, and I have calculated the correlation between these two data over different months using R. So currently I have ...
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1answer
45 views

Statistical methods for analysing correlation between stock price index and natural disasters

Can someone help me identify what statistical method (or any method) that I can use to correlate the effects of natural disasters on Stock Market Index?
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22 views

issue in finding correlation in R [migrated]

I am trying to find correlation between two separate data sets in R. The structure of my first data set is (when used ...
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2answers
44 views

Is it possible for Cramer's V to be negative?

To my understanding, Cramer's V cannot be negative because of the way we define it. But here's what I got from SAS:
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16 views

Strange: Partial Correlation changed correlations values to be negative?

I am trying to investigate the correlation values. A big problem happens. The method I used is in corpcor package in R. I have a column as missing data. I firstly calculate the correlation matrix. ...
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8 views

Matthews Correlation Coefficient yielding values outside of [-1,1] [migrated]

I'm using the formula found on Wikipedia for calculating Matthew's Correlation Coefficient. It works fairly well, most of the time, but I'm running into problems in my tool's implementation, and I'm ...
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16 views

Multidimensional Scaling: Interpreting output of different distance matrices (Euclidean or correlation)

I would like to understand the difference between using a Euclidean distance matrix or correlation matrix as input to a nMDS algorithm. I have completed MDS plots of both, and while similar, the ...
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11 views

Correlation with multiple x values for the same Y values

I had a quick question. I am trying to test the correlation between the % coral cover at each of my study sites, and the % of coral in sediment collected from those sites. The problem is that the ...
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3 views

Test for correlation of continuous with discrete and categorial variable

I have a matrix containing distances between species' habiat choices (extracted from a NMDS ordination plot). I used a Mantel test to test for correlation of habitat distance with continuous trait ...
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23 views

Understanding the Canonical Correlation Analysis

In canonical correlation analysis where max { a'COV(X,Y)b / sqrt[a'COV(X,X)a * b'COV(Y,Y)b] } where U = a'X, and V = b'Y the standard tools to solve the canonical correlation analysis (MATLAB, R, ...
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14 views

Asymmetric Dynamic Conditional Correlation in Matlab

I need to interpret the results of the estimation of the A-DCC model by Cappiello, Engle and Sheppard, 2006, Journal of Financial Econometrics. I used the Matlab routines of the MFE Toolboox ...
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14 views

Find relations without confounding variables? [duplicate]

I have multiple numerical and categorical variables which I'd like to data-mine for simple relations. I'd create simple plots of two variables which are supposed to have a meaningful statement. Can ...
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1answer
27 views

How to combine 2 variables each be strongly correlated with a 3rd variable?

I have 2 sets of variables that are weakly correlated to each other but highly correlated with third variable. Is there any method to combine these 2 variables to achieve a much more stronger ...
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31 views

Significance of average correlation coefficients

I am using fMRI data (n=25) to predict performance on a behavioral task. At each of 12 time points, I train a linear model on data from n-1 subjects and use this model to predict the left-out ...
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12 views

How to model occurrence counts in groups with latent membership?

I have a dataset that describes the daily history of occurrences of a certain phenomenon P among a certain population. (These are subdivided into certain classes or forms that the phenomenon can take: ...
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9 views

How to calculate the correlation between a variable and a matrix of variables

I'm trying to improve a factory quality control. I have some variables from the melting process (something like ten control variables) that changes trough time (a matrix of the values of those ...
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6 views

Correlating two Likert type items

I have done a survey using a questionnaire that involves Likert type questions. The answers range from 1 - Strongly agree to 5 - Strongly disagree. In this questionnaire I have included some control ...
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22 views

Comparing correlations with regards to being average at something

Say I have two correlations: Sorry about prior ambiguity: A and B are actually groups of people who responded differently to a single survey (multiple choice) question which had to do with X. The ...
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19 views

Determine concrete important factors in pca

after using the R function pcromp () I get how many factors might be important. How to determine what are these factors? Which statistical tool could I use? I appreciate your reply!
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1answer
28 views

How to quantify intraindividual variability between paired measurements?

I've collected data measuring several different parameters in several subjects at two time-points (t1 and t2). X and Y are meausurements of two anatomical structures; X is an area measured in mm2, Y ...
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0answers
10 views

results for neural network model - r or r2?

I am wondering what is the best way to report the model performance for artifical neural networks (regression). At the moment, I have a table with r value and the sum of squares error for the ...
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28 views

Web Videos that can provide me with a better understanding of statistical concepts

I have an exam coming up and I would like to know are there youtube videos/playlist or any videos online that can explain the following concepts below in a simple manner. The concepts are: ...
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32 views

Interaction between continuous variable and categorical variable (2+ categories)

I'm about to do my analysis of my Master's thesis, but I have a question. I want to check whether media effects on political trust are different between natives and immigrants. These are my variables: ...
2
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1answer
68 views

Least correlated subset of random variables from a correlation matrix

I have a correlation matrix $A$, which I obtained using the Pearson's linear correlation coefficient through Matlab's corrcoef(). The correlation matrix of dimension 100x100, i.e. I computed the ...
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30 views

Count data correlation

My dataset is basically a time series - each case is a one day and several events are being observed for each case. I am not experienced in time series analysis but I still would like to get at least ...
4
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1answer
74 views

Quantifying how much “more correlation” a correlation matrix A contains compared to a correlation matrix B

I have 2 correlation matrices $A$ and $B$ (using the Pearson's linear correlation coefficient through Matlab's corrcoef()). I would like to quantify how much "more correlation" $A$ contains compared ...
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45 views

Calculate Similarities between two arrays with different scales

In creating a content-based recommender, I have several binary measurements, combined with integer measurement values and I wish to compare the two vectors. For example, consider the following two ...
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16 views

How to specify binomial glmm with random and correlation in R?

I am working on developing a model with a binomial response variable. My data consist of GPS points from tracked animals. The data set is large and contains 15,000 observations from 40 individuals. I ...
2
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2answers
58 views

Significant difference and correlations

Is it true that when there's no significant difference between groups then there will be correlations between groups? My situation is as follows: I have a sample that was measured using two ...