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

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21 views

Why the Capital requirement (K) in BASEL has + sign in between? [on hold]

Why does the capital requirement ($K$) in BASEL have a $+$ sign in between? From Asymptotic Single Risk Factor (ASRF) models (Gordy, 2003) we have, the capital requirement: $$ (K)=\bigg[LGD\! ...
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1answer
32 views

Negative Weak Correlations

I've performed correlation tests and received negative weak correlations using ordinal and interval data. I've tired a log transformation, and still the correlations were the same. I'm looking for a ...
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0answers
12 views

Significance testing between two sets of Pearson's correlation coefficients

I have been reading through questions here to find an answer to my question but didn't find a satisfactory one. Here is my scenario: I have a system computing an algorithm on each of 100 units (so ...
2
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1answer
37 views

Drop highly correlated items?

I have two IVs that are highly correlated with each other at 0.979 (Pearson) & 0.919 (Kendall's). IV1: Quality of response IV2: Quality of Technical Advice Sample Size: 252 Considering the ...
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1answer
100 views

Why do we need r squared?

In linear regression, the r squared value is the square of the correlation between predicted values and observed values. But why do we need the r squared value? Why not just use the correlation ...
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1answer
29 views

Probability of observing a false correlation and confidence limits

In oil and gas exploration/development it is common to use acustic impedance derived from reflection seismic surveys to predict the porosity measured in wells drilled in the reservoir. I often use ...
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0answers
14 views

Excel correlate nominal and quantitative

I have the following test data: How do I correlate the "believes" with "before" to determinate if it affects the "after"? When believes is set to 1 the "after" will be (randomly) higher than when ...
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0answers
22 views

which test should be used to detect the effect of one variable on another?

I have conducted a research on four independent groups of students; one experimental and one control group at two levels. The design of the study was like a pre-test and post-test. I want to detect ...
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21 views

Suggest a statistical method for analysis [on hold]

I have to analyse the data for my dissertation work. Title of my dissertation work is "Estimation of influence of temperature and humidity on milk yield of dairy cattle and its quality parameters". ...
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8 views

Using Mantel to explore relationship between geographic distance and a multivariate character

I'm working with bird songs. A song is composed of many vocal parameters [highest frequency (Hz), lower frequency(Hz), bandwidth(Hz), duration (s), number of notes, and son on....] I'm interested in ...
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1answer
14 views

Correlations for nominal data

I have a gender variable in my questionnaire, I have done it where 1= Male and 2= Female. I would like to correlate this variable with their answers to compare the difference between male opinions ...
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0answers
14 views

Reporting Fixed Effects as (partial) correlations?

I'm doing a linear mixed effects analysis in which I'm really only interested in one of the fixed effects. I have several other fixed effects and a random intercept term, but none of them are ...
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2answers
447 views

Does non-zero correlation imply dependence?

We know of the fact that zero correlation does not imply independence. I am interested in whether a non-zero correlation implies dependence - i.e. if $\text{Corr}(X,Y)\ne0$ for some random variables ...
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3answers
73 views

I do not have hypotheses for my research and I have got only categorical data. what kind of data analysis can i conduct? also

I do not have hypotheses for my research and I have got only categorical data. what kind of data analysis can i conduct for correlation between variables? also is chi-square used only for hypotheses ...
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0answers
33 views

Choosing a test based on by data and how to test when I have several groups?

I'm trying to analyze the effect of the laying order on a certain concentration of immune factor. I have a large set of data (1000+ eggs). I want to know if egg 1 (first-laid egg) will have higher ...
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1answer
31 views

Using correlations to re-label data from Google Analytics

In my Google Analytics data a lot of traffic gets mis-labelled as "Direct" because Google doesn't know the original traffic source. I've taken 6 months worth of our "Direct" traffic data and ...
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1answer
49 views

Correlation between two normally distributed variables

Let a~$\mathcal{N}(\mu_a,{\sigma_a}^2)$,b~$\mathcal{N}(\mu_b,{\sigma_b}^2)$ and c~$\mathcal{N}(\mu_c,{\sigma_c}^2)$. We construct two normal variables x~$a-b$ and y~$a-c$. Can we find the ...
0
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1answer
18 views

Determining if time has influence on correlation between x and y

Is there a sort of statistics model I could use to determine if time has an influence on the correlation between two sets of data? For example say I have a column $X$ and a column $Y$, both just ...
0
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1answer
27 views

Adjust standard errors for within correlation

I am trying to replicate a table and in one of the notes it's written that 'standard errors are adjusted to account for the within-analyst correlation of the observations' I am running my regressions ...
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0answers
37 views

Statistical Analysis help for thesis - Correlation, Probit, Tobit and Moderation

Hello CrossValidated users! I am writing here cause I need some guidance on my statistical analysis which has turned out far too complex for my basically begineer stats skills and my self research. ...
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2answers
43 views

Correlation and collinearity in regression

I did a correlation analysis for my variables. All of them are associated (the coefficient is above 0). However, there is no collinearity problem in my regression analysis. I do not know how to ...
0
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0answers
7 views

Can I examine the confounding effect of variables on non-normal data using Pearson?

I have used Kendall's tau to examine whether there is a correlation between a number categorical variables, as I have a small sample. However, I also want to test whether some variables might have an ...
2
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2answers
108 views

Is there a result showing a relation between the size of the residuals and the correlation coefficient?

Consider an OLS regression between two variables. Is there any result which relates the size of the residuals (measured, perhaps, by the sum of the squares) to the Pearson correlation coefficient of ...
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1answer
15 views

Correlation or clustering of continuous score and discrete variable states

I have an experiment that produces a decimal score representing quality, and a bunch (5-30) of variables that each take on one of a set of discrete states. - The states are not meaningfully ...
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1answer
21 views

Is it possible to measure the independent variable with part of the dependent variable

I have Beta as my independent variable and Economic value added (EVA) as my dependent variable. To calculate EVA I need to use Cost of capital and to calculate that I have to use Beta, so is it ...
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1answer
12 views

Which test do I use; need to compare tests with one another pre and post intervention

I am writing a thesis on the validity of balance training tests. I need to compare the tests and see if they correlate with one another in testing balance in the elderly. There's a control and ...
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0answers
8 views

Detecting pattern in panel Data R

I am struggling on panel data in R. I detected some serial correlation within my data, and now I would like to detect some pattern within it. There are 166 observations and 34 variables and the data ...
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0answers
18 views

Filtering Samples of Unequal Size and Correlating Categorical with Non-Categorical Data

Suppose I have a large number of samples, some of which only contain one observation, and some of which contain up to 12. Each observation can fall into one of four categories per sample. This ...
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9 views

Growth rate vs. Absolute correlations

Conceptually, what is the reason why the correlation between growth rates of A and B would be different from correlation between actual A and B? Under what circumstances would the growth rate ...
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1answer
21 views

Comparing polynomials

I've got a bunch of data on pop singers' performance on the Hot 100 charts over time, and I'm trying to compare the early part of different artists' careers. For example, I might look compare Miley ...
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1answer
29 views

Correlation of likert scales for different questions

Can you correlate 2 Likert scales when the question for each one was different? I have 1 question which asks how concerned someone is about pollution. They rank this on a Likert Scale of 1-5 where 1 ...
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1answer
30 views

Treating multiple observations per object

I am working on a project whose aim is to analyze the relationship between machine elements and their price. My data consists of thousands of machine elements, their price, as well as technical and ...
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0answers
40 views

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

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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14 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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1answer
53 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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0answers
11 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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1answer
28 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
40 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
14 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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0answers
23 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
22 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
29 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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0answers
22 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.: ...
0
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1answer
56 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 ...
0
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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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8 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
76 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 ...