Stack Overflow
Stack Overflow

Questions tagged [multivariate-testing]

Multivariate testing (aka multi-variable testing) is hypothesis testing in the context of multivariate statistics

257 questions
0
votes
1 answer

Tukey HSD for multiple variables and single variable return different results

I have tried to run Tukey HSD for a multi-variable dataset. However, when I run the same test on a single variable, the results are completely opposite. While running for multiple variables, I observed the following error in ANOVA output: 8 out of…
Rohan
  • 54
  • 7
0
votes
0 answers

How to create a 2d polygon that outlines group data points and overlap analysis of such euclidean or hyperspace volumes

I have constructed a PCA plot using the ggbiplot function and added confidence ellipses (stat_ellipse) but I want to create a 2d polygon that outlines the contour of all data points of the different groups (consisting of three lakes), how can I do…
J van Rijn
  • 1
  • 1
0
votes
0 answers

More then three independent contrasts in PERMANOVA

I try to create more then three independent contrasts in PERMANOVA with 4 factors without success. I need to use all possible pairwise combinations of factor levels in my contr2df object. There are any way for make this possible? In my code: #1st…
Leprechault
  • 1,531
  • 12
  • 28
0
votes
0 answers

How to test if differences in variation explained (R^2) are significant

never posted on here before! I am using constrained correspondence analysis to test the ability of environmental variables to explain species occupancy data from 30 sites, separately for different treatment groups; I have five treatments in separate…
Rachel Germain
  • 1
  • 1
0
votes
2 answers

How to write an S3 formula method for a statistical model object in R

I have a function that carries out Box's M test for equality of covariance matrices in a multivariate linear model. I'd like to turn it into an S3 generic function with a formula method, which is the most natural interface. The complete current…
user101089
  • 3,756
  • 1
  • 26
  • 53
0
votes
1 answer

Using for-loop for fitted DCC GARCH model in R

I am new user in R. Please help me! I have 1114 observations with 8 assets. For example, I have fitted a multivariate DCC-GARCH model to the first 1000 data points and I want to do 1-ahead forecast for 3 periods later such as 1) Data[1:1000,]…
NSAA
  • 175
  • 1
  • 3
  • 14
0
votes
0 answers

Matrix is singular. RCOND = NaN warning in EM step of GMM

In the EM step of GMM, I call a function gaussianND as: pdf(:, j) = gaussianND(unseen_data, mu(j, :), sigma{j}); which evaluates gaussian for all data points for each cluster 'j'. I have 150 data points and 10 clusters. I get an error: "Warning:…
Yeshi
  • 11
  • 2
0
votes
0 answers

Multivariate normal distribution

I am trying to use multivariate normal distribution in R by using library MASS and function dmvnorm. I have vectors: Y = c(26.385112, 17.108580, 11.907650, 4.737202) Mu = c(31.19789, 30.33983, 29.48177, 28.62371) And covariance matrix: > Sigma …
R. Saeiti
  • 89
  • 3
  • 11
0
votes
0 answers

Error using the adonis function

I have some data from a toxicity assay. My response variable is Plutei, which is the number of normal-shaped larvae (6 replicates), collected: from 2 different species in 5 different times of the year in 3 different sites. I've treated this larvae…
Andrea
  • 1
0
votes
1 answer

Matlab multivarible regresison with time dependent variables

I'm trying to develop some code to find the significance of using an auxiliary data source to improve the predictability of a final product. I have the data ready in matlab, which is my preferred program for analysis. I'm trying to solve the…
Ben
  • 1
  • 3
0
votes
0 answers

R: combination of multivariate normal and exponential distribution

I have a set of 7 parameters with high correlation and I need to be able to extract randomly generated sets. However, my variables do not all follow a multivariate normal distribution. I've plotted the distribution of the parameters below where you…
Jonas Coussement
  • 382
  • 2
  • 15
0
votes
1 answer

Simulating data from multivariate distribution in R based on Winbugs/JAGS script

I am trying to simulate data, based on part of a JAGS/Winbugs script. The script comes from Eaves & Erkanli (2003, see, http://psych.colorado.edu/~carey/pdffiles/mcmc_eaves.pdf, page 295-296). The (part of) the script I want to base my simulations…
Inga
  • 303
  • 1
  • 4
  • 12
0
votes
1 answer

R survival analysis coxph call multiple column

I am trying to use coxph function under survival package. Normally it will be called as: coxph(Surv(time,event) ~ age+gender+salary, data=THEDATA). However, I have multiple columns in THEDATA. How can I call them easily? E.g, I want to build Cox…
lolibility
  • 2,187
  • 6
  • 25
  • 45
0
votes
1 answer

Prop.Test in R: How to correct for large number of observations

This is not really a coding question but more of a statistical question. I'm doing a proportions test on multiple proportions for many subjects. For example, subject 1 will have multiple proportions (multiple "successes per total trials"), and…
user3799576
  • 183
  • 1
  • 2
  • 10
0
votes
1 answer

google analytics a/b testing with 2 site instances.

I am getting ready to release a new web site in the coming weeks, and would like the ability to run multivariate or a/b tests between two version of the site. The site is hosted on azure, and I am using the Service Gateway to split traffic between…
Mark Jones
  • 1,461
  • 1
  • 14
  • 23
1 2 3
…
17 18