# Questions tagged [degrees-of-freedom]

The term "degrees of freedom" is used to describe the number of values in the final calculation of a statistic that are free to vary. Use also for "effective degrees of freedom".

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### CFA: chi-square value is 0 but with degrees of freedom

I want to do a SEM analysis with an actor-partner interdependence model in Mplus. I managed to calculate it and everything seems right if I look at the means, SD's, effects, etc. But I have a problem ...
57 views

### What are the degrees of freedom to consider for a G-test when some cells have expected values of 0?

Let's say I conduct a survey where people can mention their favorite color among four options (red, green, blue, yellow). After collecting the data, I create a contingency table crossing gender with ...
114 views

### Pooled Kurtosis Estimator Using Pooled Cumulant Estimators

I am trying to come up with a statistically sensible pooled kurtosis estimator that is based on pooled cumulant estimators. Specifically, I have unbiased estimators of the second and fourth cumulant ...
1 vote
28 views

### Very small degrees of freedom when using yuen function in WRS2 package of R

I'm trying to run a number of independent samples t-tests. I'm using the yuen function in the WRS2 package because my data are non-normal and ordinal. My sample ...
48 views

### p-value of pearson correlation of correlated samples

I'm not completely sure if this question has been asked before, but I couldn't find one that suit my problem so far. So basically I am doing single cell analysis, and I have roughly > 100000 cells ...
17 views

### Understanding degrees of freedom of F-statistic in Linear Regression

I was reviewing linear regression and I wanted to dig deeper into the F test that many software suites provide. I am aware that many sources comment on the degrees of freedom, but I haven't really ...
60 views

### Splines, logistic regression and sample size considerations

I have around 500 observations with a binary outcome at 25% prevalence and will be building an internally validated prediction model. I want to use splines to model non linearity in my continuous ...
20 views

### Sample covariance of t distribution and degree of freedom

If $X$ is a P by N size matrix, $X_{ij} \sim N(0,\sigma_i^2)$ if I standardize this X matrix with sample mean and sample variance (assuming I don't have access to the population mean and variance) I ...
11 views

### Problem with dfs in multilevel analysis after converting data to long format

I have a bit of an odd problem and would love to get some suggestions of what the cause could be as I am currently at a loss: Some while ago, I had converted a dataset to long format in R using melt ...
1 vote
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### How do I understand the calculation of degrees of freedom in the context of a 2 x 3 contingency table?

I am currently reading an article, Analysis of sensory ratings data with cumulative link models. In section 2.4 - example 1, the authors describe an experiment from Bi, 2002*: ... 25 subjects each ...
199 views

### Degree of freedom (df) in maximum likelihood estimate (MLE) for linear regression

I am reading Bain/Engelhardt's "Introduction to Probability and Math Statistics" about maximum likelihood estimate (MLE) for linear regression (p. 519 - 522). I first summarize 3 key points ...
1 vote
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### Using one linear model to test multiple hypotheses

Let’s assume the following: I have data of 100 subjects each performing 100 trials of a reaction time task At each trial, I measured the reaction time (RT) and a specific brain signal (BS) The RT and ...
60 views

### How to interpret zero degrees of freedom on residual deviance

I'm wondering how to interpret residual deviance from a Poisson regression on 0 degrees of freedom? I have a dataframe with count data on events and number of people at risk for the disease, with ten ...
65 views

1 vote