# f-test's questions - English 1answer

217 f-test questions.

### How to choose between F and Chisq tests to compare models?

I have been asked to report p-values for one of my model in R. In which cases should I use the F-test and in which cases should I use the chisq/LRT test? ...

### Deriving the F-test from ${{SSE_R-SSE_F}\over{(n-q)-(n-p)}}/{{SSE_F}\over{n-p}}$

0 answers, 14 views f-test sums-of-squares
Given a Full and Reduced model, the F-test to see if the reduced model is significant is given by $${{SSE_R-SSE_F}\over{(n-q)-(n-p)}}/{{SSE_F}\over{n-p}}$$ I'm trying to understand how this is ...

### 2 Why does it says data should be normally distributed for analysis, when different test follow its own distribution (i.e. t, Z, F)?

Why does it say data should be normally distributed for statistical analysis when different test follow its own distribution (i.e. t, Z, F)? What does normality have to do with this?

### Image Classification Treshold using F2 Score

0 answers, 9 views conv-neural-network f-test
I have studied famous submissions of the Kaggle: Understanding the Amazon from Space. I read the winner's interview. He writes: This is a multi-label classification challenge, and the labels are ...

### 5 Comparing two F-test statistics

1 answers, 1.957 views anova f-test
I have two groups A and B, each of which consists of 5 samples. Each sample is described in a vector of length (>1000) of continuous numeric values (characteristics). I want to test if the sample in ...

### -1 How is it possible for my F-test to show a significant result at 0% and my R2 and R2 Adjusted to be way over 5% (not significant)?

I am trying to study the effect Debt, Size (Market Cap) and Liquidity of my sample of firms have on my calculated Investment value. Thus, looking at impact of firm's characteristics on Ivestment-cash ...

### 1 How does the f-classif in scikit-learn work?

Does it combine different features and calculate the F-value between them or does it does calculate the F-value for one feature? If someone could point me to a source a book that explain this, that ...

### F-test on average within-group variation

0 answers, 5 views repeated-measures f-test
In response to an article by Bland and Altman, the response author suggests running an F-test on the average within-group variation of repeated measures for each patient when device A was used and ...

### F-test: Testing unrestricted model vs. restricted model in Gretl and SPSS

0 answers, 2.130 views multiple-regression f-test gretl
I have a proposed a model for Corporate Social Responsibility determinants (not important). Among my independent variables I obtain two that are statistically not significant. Following Wooldridge ...

### 1 Why does MANOVA report values of F-statistic in addition to Pillai/Wilks/Hotelling/Roy?

I'm conducting some multivariate analyses and I'm wondering why MANOVAs have two test statistics. For example, pasted below is an image of output usually produced by (I think) SPSS software. From what ...

### -1 Is the F test for R² in (multiple) Regression one- or two-tailed?

1 answers, 2.748 views regression r-squared f-test

### 1 Toda-Yamamoto Mutually Causal Relationship between I(0) and I(1) Variables

I want to sanity check some results. I've run a TY causality test following the Toda-Yamamoto (TY) procedure as described by Dave Giles in his blog post "Testing for Granger Causality". One variable ...

### In the MANCOVA, how is a post hoc analysis conducted

0 answers, 95 views f-test type-i-errors mancova
Please help with the following questions. a. In the MANCOVA, how is a post hoc analysis conducted b. In the MANOVA, the dependent variables must be... c. Using the MANOVA, if the sufficient number of ...

### Can you perform an inverse F-test on two datasets with the same degrees of freedom?

1 answers, 32 views distributions chi-squared sample f-test
Stats newbie here. Is there any meaning to the critical F value if the two samples have the same degrees of freedom? For example, I have 2 sets of data, each with the same number of degrees of ...

### 1 How do I interpret the results from the F-test in excel

I have a fairly simple question regarding the interpretation of the F-test in Microsoft Excel. Let't say these are the results of my F-test: I am now wondering how to interpret it in order to choose ...

### 1 How to get F-test p-value

3 answers, 48.840 views hypothesis-testing variance p-value f-test
Suppose we can choose from two different catalysers. 10 observations are taken from the first one and 12 from the other one. If $s_1 = 14$ and $s_2 = 28$, can we reject at $\alpha = 5\%$ the ...

### Which statistical test will be better

0 answers, 33 views t-test chi-squared f-test
I have following type of data: Col1 col2 GroupName n1 m1 Group1 n2 m2 Group1 n11 m11 Group2 n22 m22 Group2 n33 m33 Group2 .....................

### Stats newbie: How do you determine the number of degrees of freedom in an F-test using reduced chi-squared?

This question is kind of three questions wrapped into one. I am no statistician, just trying to figure out how best to treat my data. Please bear with me. I have an $N$-length vector of observed data,...

### 4 Is F test used for feature selection only for features with numerical and continuous domain?

1 answers, 3.845 views anova feature-selection scikit-learn f-test
The F-statistic/test can be used for feature selection, e.g. from http://scikit-learn.org/stable/modules/generated/sklearn.feature_selection.f_classif.html#sklearn.feature_selection.f_classif ANOVA ...

### 2 F test to test equality of variance

2 answers, 1.407 views time-series variance f-test
I have a single time series which will be divided on the date of the change before and after. I want to compare the variances between the two time sections and I am told to do an F test of residual ...

### 1 Symmetric measure of variable contribution to a regression

0 answers, 82 views regression f-test deviance importance
Take a linear regression setup with two "blocks" of predictors. The typical measures for the contribution of each block over the other are asymmetric (say, likelihood change, RSS change etc.). Is ...

### 1 reporting average inferential statistics from bootstrapped dataset

For independent reasons, I'm working on two bootstrapped datasets, A and B, of the same size, each consisting of a 1000 samples. To compare the distributions of A and B, I ran a Fischer F-test on ...

### Generalized additive model: low F-test?

0 answers, 115 views r statistical-significance gam f-test
I am confused about the F-test value in the smoothing terms of a GAM model. ...

### 3 Can I calculate confidence interval for effect size using only F test score and N?

0 answers, 31 views confidence-interval effect-size f-test
I was able to calculate the effect size for a sample for which I only have the total N and F-test score. However, I also would like to calculate the confidence interval or margin of error for that ...

### 1 If the f-test is insignificant but coefficients are significant, can I use it?

If the linear regression's f-test is insignificant but its coefficients are significant in t-test, can I use this regression and its coefficients? In academic journals, I find people use linear ...

### F-test, T-test and R square values

I was conducting PLS-SEM analysis in SmartPLS and came across an interesting scenario For every R square (explained variance in endogenous variable) and F square value (removing and keeping a ...

### Permutation version of Ftest

1 answers, 54 views permutation-test f-test
is there some permutation test version of F-test (comparing equal variances of two data sets)? I know the permutation version of T-test because I can shuffle data assuming to H0 (expected values are ...

### F-test comparing the variances of two in/dependent variables

I have 64 time meausures at morning, and 64 measures at evening. I would like to use F-test, to compare variances of my times (are my times equally "stable" at morning an evening?). All time ...