# All Questions

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### How the expectation-maximization algorithm could be used for finding missing values in the data? [on hold]

How does the EM algorithm deal with missing data values? Is it the best method for this purpose?
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### Existence of limit of upcrossings of a sequence of random variables

From Williams' Probability with Martingales: Is the corollary asserting existence of $\lim_N U_N[a,b]$? If so, how do we know it exists? Is it necessarily finite? If not, it is the ...
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### Difference between volatitlity of Annualized return and Annualized volatility of returns

I have a series of monthly returns on financial data. My goal is to estimate the volatility of 10 year rolling returns. I am a bit confused on two options. a) Calculate 10 year rolling returns, ...
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### How to return output values from MLP? [on hold]

I developed my MLP with two outputs. I used Neuroph Studio. I then imported it in NetBeans using the follwoing code ...
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### Test for actual realisations

I'm performing binomial test to check whether the number of occurrences within buckets are not greater than 95%. I'm using R for that. ...
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### Which model to use for panel data?

For my masters thesis in corporate finance I'm doing a research about debt concentration (i.e. companies using several debt types or only 1, measured by HHI index) I've got several determinants and ...
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### How to specify exact rise-to-peak and decay-to-baseline times in an exponential function, generating a waveform?

I am attempting to model the fluorescent signal emitted by a fluorescent calcium indicator (lights up when there is calcium influx into a cell). According to [1], the following formula works as a ...
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### taking log of sales when many observations are 0 or close?

I am currently attempting to replicate an Econ paper in R, which claims that they take the natural log of net sales. Many of the observations however are either 0 or very close to 0. What is the ...
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### Statistical optimization Model for which person should be assigned a lead within each state

I am working on creating an optimization model based on sales on a particular website. The system assigns the leads to different sales people. I want to generate a model doesn't randomly assign leads ...
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### Multiple subgroups Linear Correlation

I would like to test the correlation between two devices. I have a set of measurements of both devices of a certain subject under different physiological conditions. And I have that over a batch of ...
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### Does Bonferroni apply to inference from parametric and non-parametric models?

I have run 6 independent-samples t-tests, and 4 Mann Whitney U tests. When applying Bonferroni correction, does it apply across all 10 tests? My hypotheses are that there will be 4 significant ...
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### Statistical test between pairs of values recorded by human and machine inorder to find the agreement between them

I have a set of independent values (which are subjective) recorded based on both human observation and machine recorded ones. At this point I want to ask serval questions like what is the agreement ...
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### odds ratio for constant as reference group

Data: ‎ X1 is a categorical predictor with 2 levels: more than median (X1=1), less ‎than median (X1=0)‎ X2 is another categorical predictor with 2 levels: more than median (X2=1), ‎less than median ...
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### sjPlot: probabilities. How to interpret?

I am running the following model in R: model = lmer(Tau ~ ageS*days+YrsOfEds*days+sex*days+tract*days + (1|SubjectID), data=long) With this model I am ...
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### ELO in multiplayer games [on hold]

In a multiplayer pvp game is it possible to calculate a weighted Elo and an unweighted Elo concurrently when the weighted Elo is used to determine matches?
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### How to use LSUV initialization in tensorflow?

How to use LSUV initialization in tensorflow? Tensorflow variable seems only have those few initializer.