Is “Total Inertia” in RDA/CCA a valid way to compare the total variance in...
In vegan’s RDA and CCA functions, the total variance of an ordination is given as inertia. My question is very simple: Is there a way to compare the variability in different (species composition)...
View ArticleWhat should be the ratio between number of cases and attributes in...
Is there any way to determine if it is feasible to perform a multivariate regression based on a given number of samples and attributes? For example I have a data set with 6 cases , 30 attributes and 5...
View ArticleShow that the distribution of...
Show that the distribution of $(n-1)overline{X}’(S^{-1}-dfrac{S^{-1}mu_0mu_0′S^{-1}}{mu_0′S^{-1}mu_0})overline{X}$ is $T^2(p-1,n-1)$ where $X_isim N_p(mu,Sigma)$, where $Sigma$ is pd but unknown, and...
View ArticleTrend break down using statistical models
I have a time series data with revenue for each week. Following are the independent variable information available for each week- margin,number of customers,units sold per customer. There is a downward...
View ArticleMulti-response Multivariate Coefficient of Determinations
For the linear model, $$ bf{Y} = mu_{Y} + bf{B}^t left(bf{X}-bf{mu_X}right) + boldsymbol{epsilon} $$ Where, $bf{Y}$ is a $n times q$ matrix of $q$ responses, and $bf{X}$ is a $n times p$ matrix of $p$...
View ArticleShow that the distribution of...
Show that the distribution of $(n-1)overline{X}’(S^{-1}-dfrac{S^{-1}mu_0mu_0′S^{-1}}{mu_0′S^{-1}mu_0})overline{X}$ is $T^2(p-1,n-1)$ where $X_isim N_p(mu,Sigma)$, where $Sigma$ is pd but unknown, and...
View ArticleLooking for proper method to analyse a data sample (n=200) with a huge amount...
I have a data sample (approx 200) from a population of about 60 000 people. There are around 800 columns/variables in my data (the reason being that I had a few questions for which I applied a multiple...
View ArticleTransformations possible when performing a single multivariate ANOVA on a...
I want to study the impact of aquaculture on a hard rocky seafloor community which is naturally low in diversity. 4 replicate images (0.25 m2 each) were taken at fixed distances (0, 20, 40, 80, 120,...
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Help needed quickly to understand terminology in R! [closed]
I need explanations on the terms intercept, estimate, std.error, df, t-value and pr(>|t|)? I tried to find answers on the Internet, but the explanations are difficult to understand. Anyone who can...
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Predicting multivariate uneven time series of discrete/categorical data
I have a basic background in stats, DSP, ML etc. but by no means an expert so some of my terminology is going to be rusty. It probably makes the most sense if I simply show you what i wanted to do and...
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