# All Questions

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### Calculating PLV (phase locked value) using ifreq function in seewave package in R

I am trying to calculate the PLV (phase locking value) using the seewave package in R. My code for calculating the PLV looks like this: ...
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### Importance of independent variables; continious vs categorical

I have many independent variables which are affecting the outcome of a dependent variable (dependent variable is "return_impression" in figure below). When I measure the importance of these ...
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### Interpretation of some prior distributions in example

Suppose I have 3 variances $W_{j}$ that can be expressed as $W_{j}=q_{j}V$ with $j = 1,2,3$. According to one model, I want $W_{3}$ to be "pronounced" and $W_{1}$, $W_{2}$ should be small to avoid ...
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### How to find the joint distribution in embedded space

Euclidean Embedding of Co-occurr ence Data under Section 2, the problem formulation is given. In the paper link, the Authors find the distribution for lower embedding for the squared distances between ...
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### Linear model decomposition

Is is possible to decompose fitted linear model? What I mean by that: I have parameters of fitted linear model as following: y=2.3a-1.23b+1.65c+1.76d Now I have ...
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### Fisher test of periodicity

I have evenly sampled time series on which I applied Fourier transform. I am trying do determine if the signal contains statistically significant periodic components. I have succeeded with determining ...
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### Predict magnitude from angle in linear regression

I have some data where I want to see if the magnitude of an effect depends on the direction. (Analogous to asking if wind speed depends on wind direction, for example.) In the circular package there ...
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### Model averaging with MuMIn. What's the mean of pvalue?

the summary() of a model.avg made with MuMIn in R, give a lot of interesting results, in particular model averaged coefficients (estimate, standard error, adjusted standard error and a z value with a ...
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### How can I grab specific data points from one spreadsheet based on another spreadsheet? [on hold]

I am a journalist currently trying to crunch some data for a story I'm writing about Maine's craft beer industry. I have been given two spreadsheets related to beer production from the state, and ...
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### variance of the variance for finite population for normal distribution

I am interested in calculating the variance of the sample variance for a finite population...of course in the limit of sampling the entire population, this will be zero. There seems to be one author ...
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### Which statistical test to use with repeated measures & clustered observations?

I am doing experimental study for my research. I have class with 24 students and six groups, where each group includes 4 students. I want to compare the performance of each group in two cases: first, ...
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### When comparing variability between unequal samples, is there a way to correct for sample size?

I am trying to compare test measurements taken at three time points in a training paradigm. The data for each test consists of a number of durations in ms. The variable I'm interested in is the ...
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### PSM, Diff-in-Diff and Neg-logged income variable? How to interpret estimates?

I am estimating a difference-in-difference based on propensity score matching. The "treatment"-variable defines whether a household registered for a public insurance which was only active for two ...
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### Requirements of text-sources for most promising results with Latent Dirichlet Allocation (LDA)

I was wondering if there are any papers about the efficiency of the LDA in terms of human reception in relation to the document-type. Resprectively, are the topics that LDA finds for books, ...
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### Statistical test for repeated measures ANOVA with covariates

We have 10 participants who have undergone a cold pressor test (for pain) in 3 conditions (no drug, drug A, drug B). It is a repeated measure design. The stimulus is continued for 1 minute after they ...
37 views

### How do I handle nonexistent or missing data?

I tried a forecasting method and want to check if my method is correct or not. My study is comparing different kinds of mutual funds. I want to use the GCC index as a benchmark for one of them but ...
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### how could i handle with missing data or non existent data? [duplicate]

i tried a forecasting method and i want to check if it is correct or not and why? my study is about evaluating mutual funds for two kind of them it is a comparative study and i wan to use gcc index ...
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### Regression model for predicting life expectancy

I have average life expectancy at birth data for an 8 year period and I would like to use that 8 year period to predict the trend for average life expectancy for the next 5 years. I would then like to ...
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### Time series with correlated observations: How to start analysis?

We have a time series dataset: Daily arrivals of asylum seekers. Goal is to model this variable. In particular we would like to attempt Arima modeling and/or fitting a distribution. Before we get to ...
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### The GPD part of transforming standardized residuals to uniform variates

I need help (or clarity) with transforming a series of standardized residuals, through their parametric CDF, into uniform variates. I started with the awesome R-package, "rugarch": spec <- ...
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### sequential importance sampling step by step

I'm experiencing some problems when learning particle filtering (without resampling). I've found examples where the bootstrap filter has been used but none using the sequential importance sampling. ...
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### Using t-test for feature selection after z-scoring data?

Suppose I have a high-dimensional dataset, and a binary classification problem. I want to use the two-sample t-test for feature selection. If the data has been normalized by z-scoring (so it has zero ...
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### Best statistical method to show different performance week over week

I am trying to get best statical method to show performance of accumulative revenue by customer compare week over week. Currently I have about over 100 customer charts compare by hour from same day ...
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### The Mean of the number of times until an event occurs

Lets say we have 6 cards in a hat, that are all red. Now each time, we blindly take a card out of the hat: - If the card is red, we take it out of the hat and insert a blue card. - If the card is ...
10 views

### Plot eigenvectors Matlab [on hold]

I had an A table and found the eigenvectors which are ...
18 views

### Two Gaussian Likelihoods with Two Decision Boundaries , 0/1 loss function

we assume that Y := {1, 2}. Then our decision can be re-written as y ∗ = {1 if p(x|y = 1) > p(x|y = 2) , 2 otherwise} with a decision boundary at p(x|y = 1) = p(x|y = 2). How can we construct an ...
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### Possible to code contrasts comparing each level to grand mean with no reference category?

I'm working on a health care outcome regression model using the deviation contrast scheme described on the UCLA SAS help page here for a collection of dichotomous predictor variables measuring medical ...
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### Shortcomings of logistic regression [on hold]

I've recently started exploring logistic regression for modeling purposes and well... it's just performing pretty poorly. Apologies for a very broad question, but I just can't figure out why! Here's ...
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### What is the distribution of the random variablle [on hold]

An aircraft passenger is tested to check if he is infected by H1N1 virus.