Tagged Questions

2
votes
0answers
41 views

Categorical vs Continuous Variable

I have two variables, one continuous and one categorical which I currently both use as predictor variables in a logistic regression model. Their relationship is shown in the following plot with the ...
0
votes
0answers
27 views

Joint PDF change of variables

I now understand how to conduct a change of variables for a marginal PDF. Now, given two functions that define parameter's spatially: $C_A(x)$ and $C_B(x)$, is it possible to construct the Joint PDF, ...
1
vote
2answers
68 views

Pre-truncation moments for truncated multivariate normal

Suppose the random variable $Y$ has a multivariate normal (MVN) distribution, and consider truncating $Y$ in some way to create $T$. Given $T$'s mean and covariance matrix, I'd like to obtain $Y$'s ...
2
votes
0answers
91 views

test for correlation of a multivariate non-normal distribution

Assume I want to generate a sample of n-dimensional vector $z$ with a given correlation matrix $Corr(z)=R$. Some of the margins of its distribution are not normal (if you're interested here's the ...
1
vote
0answers
92 views

Multidimensional similarity analysis - graph similarity?

I study several chemicals that their effects on different reference surfaces is measured and plotted individually (on a semi-log plot of effect vs concentration of chemical). Is there a way to find ...
1
vote
2answers
71 views

Statistical test to find variable causing failure

I have a database with tests that are either a pass or fail and around 25 description fields. Each description field is either a boolean or has between 3 and 10 options. I'd like to hook into my ...
11
votes
0answers
298 views

SVD of correlated matrix should be additive but doesn't appear to be

I'm just trying to replicate a claim made in the following paper, Finding Correlated Biclusters from Gene Expression Data, which is: Proposition 4. If $X_{IJ}=R_{I}C^{T}_{J}$. then we have: ...
2
votes
2answers
175 views

How do I evaluate relationships between 500 binary attributes and corresponding continuous score?

I'm going to preface this all by saying that I'm pretty pedestrian when it comes to large statistical analysis. I have approximately 11K discrete events and a corresponding score. I also have ...
1
vote
1answer
45 views

Determining which variables affect which measurements

What software (or method) can I use to determine correlations between any sets of variables and results? Background: I would like to analyze sets of our archived data over several years. Knowledge ...
4
votes
2answers
170 views

Two DV's in a 2x2 factorial experiment

I'm trying to investigate the effect on (a) tear resistance and (b) gloss of a piece of film due to additive and extrusion method. I can see that the best results for tear resistance is low additive ...
2
votes
2answers
114 views

Getting sense of and testing multiple correlations in two-block structure

I am exploring a multidimensional data set. The variables can be mainly divided into two groups: A and B. I have calculated the correlation (Spearman's rho) matrix of this data set, and found that ...
1
vote
3answers
609 views

Issues on computing Pearson correlation coefficient for two vectors

When computing the Pearson correlation coefficient between a vector $X = \{x_1,...,x_n\}$ and a vector $Y = \{y_1,...,y_n\}$, we need to compute it as ...
2
votes
3answers
338 views

How to perform factor and canonical correlation analysis on correlation matrices in R?

I know how to do factor and canonical correlation analysis on raw data in R. But sometimes we only having correlation matrices for the data. I'd like to know any R functions which can take correlation ...
2
votes
1answer
137 views

Statistics for multi-test replicated correlation analysis

I'm analyzing pairwise correlations of time series between two different types of microarrays done for several samples as biological replicates. So, I have M1 number of variables on type 1 array, M2 ...
6
votes
1answer
337 views

Canonical correlation analysis and time series analysis

Is there a way to utilize Canonical Correlation Analysis when your data are time series and repeated measures (i.e. your experimental units are not independent)? How might one approach the analysis ...
2
votes
3answers
596 views

These two variables are almost uncorrelated. What else can I say?

I have two variables for some districts in the UK: Number of crimes per habitant Median yearly income Here's what it looks like: I would like to determine if there is a dependence between the ...
2
votes
2answers
453 views

How to get a redundancy index when performing canonical correlation analysis in SPSS?

I am trying to perform a canonical correlation analysis to investigate the relationship between attitudes (14 variables), perceived consumer effectiveness (6 variables) AND Intention to dine (DV) 14 ...
3
votes
1answer
266 views

What kind of statistical analysis should I do to aggregate these values?

I'm trying to make sense of some data and get statistical results on them. What I have is the following: ...
9
votes
2answers
471 views

How to find relationships between different types of events (defined by their 2D location)?

I have a dataset of events that happened during the same period of time. Each event has a type (there are few different types, less then ten) and a location, represented as a 2D point. I would like ...
9
votes
3answers
3k views

MANOVA and correlations between dependent variables: how strong is too strong?

The dependent variables in a MANOVA should not be "too strongly correlated." But how strong a correlation is too strong? It would be interesting to get people's opinions on this issue. For instance, ...