Questions tagged [partial-correlation]

Partial correlation is the correlation between two variables when some other variables are controlled for. An example is the partial autocorrelation function in time series.

154 questions
Filter by
Sorted by
Tagged with
23 views

Which test is suitable in below situation?

I want to calculate the correlation of two continuous variables, unfortunately both of them are not normally distributed. (by using Shapiro-Wilk test) There are two categorical confounding variables ...
18 views

Real life use of acf and pacf

I understood ACF usefulness, with a temperature example... If we have a temperature time series, it is useful to know (for example) how correlated the temperature of past month is with this month. ...
20 views

57 views

Why to use ARMA model as a time series is either over-differenced or under-differenced?

Knowing that a time series is over-differenced or under-differenced, and adding an AR term to the model means that we are partially differencing the time series if it's underdifferenced till a white ...
48 views

A question about sample partial correlation coefficient and multiple correlation coefficient

Question: My problem: All possible formulae of Multiple and Partial Correlation Coefficient I know :- But I am not sure, which one to use to know about the situation or condition mentioned in the ...
178 views

A problem about Partial Correlation Coefficient

Question: Prove that for a set of p variables, if all the simple correlation coefficients are negative, then all the partial correlation coefficients of all orders are also negative. My problem: I ...
39 views

How can I mitigate influence of other factors on correlation

Let's say we found strong correlation between meat consumption and life expectancy. We also know there's correlation between GNI and meet consumption and between GNI and life expectancy. Is there a ...
251 views

partial correlation from lm model

I'm trying to calculate partial correlations from lm ...
9 views

How to measure correlations in psudo-random datasets?

I have two datasets with millions of y-values. (They are in chronological order so the X values have been omitted as they become merely an index.) ...
47 views

How to calculate correlation of bit list

I have 5 data streams of seemingly random bits, only 0's and 1's that I need to calculate the correlation between. The datastreams are seemingly random because I should have the same number of 0's ...
129 views

Partial Correlation from Simple Correlation

Given variables $X, Y, Z_i, i\in{1,...,n}$. I want to calculate the partial correlation $Cor(X,Y|Z_1, ..., Z_n)$ from the simple correlations $Cor(X,Y), Cor(X,Z_1),$ etc. I have found a formula ...
95 views

What is the meaning of having the autocorelation function a cut of at a specific lag and at the same time the partial autocorrelation tails off

having the case that the ACF have only, for example on spike at lag 1 , and the PACF decays exponentially this is a MA model signature. but what is the meaning of having the a value at a the lag K on ...
27 views

meta-analysis with correlation and se without sample size

I'm doing a meta-analysis on the regression slope. The comprehensive meta-analysis allows me to input either correlation and standard error, or correlation and sample size. But when I tried these two ...
44 views

$R^2$ value and associated significance for each predictor in regression

I would like to measure the $R^2$ value for each of the predictors in my regression analysis. I understand that I can either use the $R^2$ change in a hierarchical regression, or I can square the ...
90 views

When to use partial vs semi-partial correlation?

I understand the concepts of partial and semi-partial correlation, but I am still not clear on when to use one over the other. Are there specific research questions that would determine that we need ...
69 views

Control for variables: multiple regression vs residuals

I'm trying to understand how to control for variables in linear regression. Say I want to predict $\mathrm{outcome}$ using $x_1$ and control for $x_2$ and $x_3$. The common approach I see is just ...
98 views

Do “splits” in scatterplots indicate anything?

Background I'm exploring how 7 system parameters spanning mechanical, electrical, and physical (size) properties are related. I gathered the 7 specs of 36 different systems, and I plotted every ...
34 views

Definition of PACF - Is the projection of a past variable $z_t$ on future variables $z_{t+1},…z_{t+k-1}$ zero?

According to the Wikipedia, the partial autocorrelation function of lag k is defined as: $\alpha(k) = \operatorname{Cor}(z_{t+k} - P_{t,k}(z_{t+k}),\, z_t - P_{t,k}(z_t)),\text{ for }k\geq 2,$ where ...
143 views

Can we use Correlation coeffiecients in non linear case

So I am having a data of several variables (one is a dependent variable and the others are independent variables). I am not sure if the relation between each of these independent variables and the ...
147 views

Problem of extremly increasing Partial Autocorrelations in time series data

I'm currently trying to make a forecast of the use of prepaid payment instruments using ARIMA modelling in Stata. I have a time series data set, containing monthly oberservations from April 2011 to ...
160 views

Partial Correlation vs. Interaction

Analysis type: linear mixed-effects model DV: cortisol (4 time points per participant - morning, noon, 5pm, 9pm) IV 1: time-since-waking (continuous, repeated measure, variably spaced/unstructured ...
624 views

Partial correlation with continuous and categorical variables (SPSS)

I have results of 7 neuropsychological tests, and I am studying the convergent/divergent validity of one of these tests. These are the continuous variables. I also have background variables: gender ...
94 views

Cause and effect Relationship

I understand that correlation can tell us the association (strength, direction) between two continuous variables. I also understand that Regression analysis can predict the behavior of the dependent ...
617 views

How to interpret zero order correlation and higher order partial correlation?

I have performed correlation analysis between y and seven different variables (x1,x2,x3,x4,x5,x6,x7). In some cases, result shows zero order correlation is positive and partial correlation is negative ...
1k views

How to determine order of sarima?

hey, I have a dataset that contains hourly wind speeds. When I plotted my original acf, it showed seasonality at every 24 lags so I applied a difference of 24 to remove seasonality and another ...
40 views

Deduction of a correlation [duplicate]

Theoretically if one variable (Black and White Imagery) does not significantly correlate with another variable (Perceived Usability), in practice (real world situation) does this mean that there is no ...