# Tagged Questions

Refers to the normal distribution, the Gaussian continuous probability distribution.

46 views

### Difference between normality of residuals vs normality in each group.

I've been searching on the internet and books for quite a long time now and have come to the conclusion that normality of the residuals (each values minus the mean of each group) is the same as ...
20 views

### Normality assumption neural networks

I am doing regression with neural network and my inputs and target data is not normal even after log transforming and standardizing. I am using MSE as the cost function. Is there a normality ...
12 views

### Which cases will the Mardia Skewness test, while the kurtosis would give us good results? [closed]

I know that for some symetric, unimodal distributions the skewness test do fine. But sometimes, I get really poor results for such distributions. When applying the kurtosis test - I get fine results. ...
19 views

### duplicate qqnorm [duplicate]

I am trying to duplicate the qqnorm plot here ...
79 views

### Heteroskedasticity and Distribution of the Dependent Variable in Linear Models

I am running a multivariate ols model where my dependent variable is Food Consumption Score, an index created by the weighted sum of the consumption occurrences of some given food categories. ...
14 views

### Python Scipy expanded Shapiro Wilks test

Does anyone know for certain if scipy.stats.shapiro uses the expanded Shapiro-Wilks test approach by J.P. Royston? Should I only use this function for sample sizes ...
21 views

### Alternative to linear regression

I need to run hundreds of linear regression models, with the same set of independent variables, but with varying dependent variables. I have checked normality for a few dozens. Some are normally ...
13 views

### How can i check the bivariate normality ? (by using sas)

I am doing part c,i want to ask: 1.)how can i check the bivariate normality? 2.) if one of the variable does not follow normal distribution (by qqplot) is it a strong evidence for saying the ...
24 views

### Non-linear least squares and the distribution of an estimator

I have been trying to find the asymptotic normality of the non-linear least squares estimator. If I start with $0=X_t(\beta)'(y_t-x_t(\beta))$. I know that I have to perform Taylor expansion around ...
20 views

### parametric or non-parametric in comparison of a dependent variable within several groups

I am comparing maths and chemistry scores of students in several schools. I am not comparing the schools with each other. I am just trying to say that students do better in maths than in chemistry in ...
24 views

### Large sample distribution arising from a beta distribution

Let $X_1,X_2,...$ be a sequence of i.i.d. random variables having p.d.f as, $f(x)=\frac{1}{B(6,4)}x^5(1-x)^3,0<x<1.$ Let $Y_i=\frac{X_i}{1-X_i}$ and $U_n=\frac{1}{n}\sum Y_i.$We have to find,...
86 views

### How to report non-normal distribution and Wilcoxon in APA style

I have within-subject design and want to compare the means of two conditions. I first run the test for normal distribution and used Shapiro and p values are ...
78 views

### t-Test residual analysis

I'm reading Experimental Design and Analysis by H.Seltman (http://www.stat.cmu.edu/~hseltman/309/Book/Book.pdf) and working on the provided HCI dataset (SPSS format, can be downloaded from page 143). ...
25 views

### Calculating standard deviations and testing the null hypothesis in a biological sample with n = 6

I am doing experiments on the viability of cells after treatment with different amounts of a certain substance. I have split my original cell line into 6 separate flasks at 3 days after unfreezing. ...