0
votes
0answers
10 views

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?
0
votes
0answers
12 views

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 ...
2
votes
0answers
12 views

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, ...
0
votes
0answers
4 views

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 ...
0
votes
0answers
6 views

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. ...
1
vote
0answers
12 views

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 ...
0
votes
1answer
8 views

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 ...
0
votes
1answer
37 views

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 ...
0
votes
0answers
27 views

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 ...
0
votes
0answers
4 views

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 ...
5
votes
3answers
174 views

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 ...
0
votes
0answers
7 views

Observed information matrix in Cox model with constant baseline hazard

I am trying to explore properties of Cox model with (parametric) constant baseline hazard function. So the hazard function for the model is $\lambda(t|Z_i) = \lambda_0(t) ...
1
vote
0answers
16 views

Statistical test to determine which system more accurately describes a trend

I have a known variable, for example a trend of heart rate, and two systems (A, & B) who sample this variable the same number of times but at different, unequal intervals. For example, system A ...
0
votes
0answers
4 views

Expectation of precision, recall, f1

Let $X^n$ be a sample of size $n$ drawn from a Bernoulli distribution with mean $\rho$. Let $Y^n$ be a sample of predictions drawn from another Bernoulli distribution with mean $\gamma$. It's easy to ...
0
votes
0answers
7 views

How to use metfor and meta packages for forest parts of pooled proportions [on hold]

Has anyone used these packages to create a forest plot of proportions- where the proportion and 95%CI displayed for each study is a simple proportion with an exact binomial 95%CI, and the package ...
0
votes
0answers
4 views

Figuring out distribution parameters for specified modes

I'm trying to find out, which parameters $\alpha_i$ should Dirichlet distribution have in order to have as modes some specified $x_i$. The formula for mode for Dirichlet distribution is this (from ...
1
vote
0answers
12 views

Statistical test for relationships when many samples are unknown

I'm fairly new to statistics - I'm sure this is a basic question but my google searching is failing me. Happy to just be pointed to other reading. I have 3 datasets of varying sizes (N1 ~ 200,000, N2 ...
0
votes
0answers
7 views

python: how to use cholesky decomposition for whiting the feature matrix before k-means

I would like to use scipy.linalg.cholesky before scipy.cluster.vq.kmeans2 so the clustering will be on the "Mahalanobis" ...
2
votes
1answer
24 views

Is AIC a valid criterion for the selection of variance structures in GLS?

In generalized least squares, I’ve specified a weights function that accounts for heterogeneity in residual variance that exist along the range of a covariate. The validation graphs (residuals ...
0
votes
0answers
8 views

How can I analyze family structure with this data set? [on hold]

I have a data set in which household is as a unit One of the variable is about relationship between household members: Relationship to household master: 0=household master 1=spouse 2=son/daughter ...
2
votes
0answers
54 views

Should the correlation PCA projection be computed on original or normalized samples?

Suppose we compute the correlation PCA of a dataset $X$ (with $m$ variables and $n$ observations) by first normalizing the input variables. That is: mean -> 0 and standard deviation -> 1. Let us ...
0
votes
1answer
15 views

8 variables for 12 months. Sigmaplot

I have measeured 8 variables for 12 months. n = 5-20. So, now I have mean, STDEV, SEM and n for those variables. I have trying to show relationship within those variables and among months. So, I ...
0
votes
0answers
11 views

Segmentation analysis: Correct test to use?

As part of a larger study, we have collected a wealth of data on the interactions customers engage in when buying and using a service. We have tried to look at this relatively close to reality. ...
1
vote
0answers
14 views

Calculating p-value based on Chi-Square vs Z-Test incl Standard Error

I have been testing the significance levels for my various a/b tests. Degree of freedom is 1 so there's not a lot of complications here. So far I've been calculating my results using Chi-Squared ...
0
votes
0answers
21 views

a question on time series [on hold]

I'm studying with time series. Please tell me whether there exist trend for each plot. I think that there exist. But I want to check it. ,thank you
0
votes
2answers
24 views

How to get Cox & Snell, Nagelkerke R-Square in R logistic regression output?

I'm new to R (used to work with SPSS), and looking for a function that will output the Cox & Snell and Nagelkerke R-Square measures of logistic regression. In SPSS they are displayed as part of ...
0
votes
1answer
20 views

RJAGS bayesian approach of mixed effects model

Why my posterior result always shows that the sigma and sigma.c estimates to be around 50? It should not be that large as I know from another approach of analysis and also summary of the data. Is it ...
0
votes
0answers
10 views

Correct Feature Selection Methodology?

I am running a weighted multiple linear regression where my independent variables take binary values, 0 and 1. The dependent variable y, takes numeric values (positive as well as negative). The ...
0
votes
0answers
22 views

Help for mediation [on hold]

my research question is: "Can we say that the number of hours of Internet use increases with Internet purchase? This influence of Internet purchase on the number of use can it be explained by an ...
0
votes
0answers
15 views
+50

aggregating constructs by Group

This is probably a very basic question; I have a data-frame with a fake questionnaire with three sets of questions measuring three constructs. I'm currently reading some research papers which in ...
0
votes
0answers
6 views

Why is a fractional factorial design $2^{9-5}$ of resolution 3?

I was sort of self-studying a poorly-elaborated lecture note of factorial design. It mentioned that a $2^{9-5}$ design has resolution 3. This is checked with the table below. It has $2^4=16$ runs, ...
0
votes
0answers
14 views

University students' research with Panel Data [on hold]

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 ...
-3
votes
0answers
92 views

I am learning advanced machine learning and would to build a machine learning library in python.Please help(For learning purposes only) [on hold]

Need some resources like books,blogs etc. Like something on the lines of scikit learn.I just want build an ml lib to dig deeper into ml.Not trying "reinvent the wheel" Background about me:Have read ...
0
votes
0answers
14 views

Multinomial logit / time-series fixed effects / multivariate regression: Which one to use in this case?

Friends, As part of a larger study, we have collected a wealth of data on the interactions customers engage in when buying and using a service. Particularly, we have distinguished this process into ...
0
votes
0answers
9 views

Distribution of same parameter estimated for many data sets

I'm using an MCMC method (http://arxiv.org/abs/1601.05388) to estimate several parameters for around 16,000 different data sets. For each data set, there is a posterior distribution on my parameters. ...
0
votes
0answers
9 views

When do I add elevation and time dimensions to my point process analysis [duplicate]

I have points I want to analyze their patterns. The points are of a real world data, let's say crime or settlements in the suburban or anything. I can apply elevation to it and I there is a time for ...
0
votes
0answers
12 views

Difference between 2D and 3D point process

I have points that have elevation attached to them (they were 2D but then someone from the department of geography helped us applying elevation so now they are 3D). I'm about to explore options for ...
0
votes
0answers
8 views

Does anyone have real world example for random point pattern

I have been writing a paper and need to give examples for the different patterns that are result of point process. It has to be real world examples. For clustered I give the example of settlements and ...
0
votes
0answers
11 views

Corelation of 2 variables [on hold]

I have 5 point likert scale questionnaire as dependant variable..and yes /no quectionnaire as independant variable.how i analyze this with spss..want to find correlation of these 2 variables and find ...
0
votes
1answer
13 views

Can random point process generator generate pattern that is not random?

I am using esri arc to generate random points. I then analyze the pattern from this process using Average Nearest Neighbor which is also in esri gis but lets say it can be in any other software. Is ...
0
votes
0answers
7 views

Generating random point process in Excel [on hold]

I need to generate random point process manually to learn in the same way they do in other software like arc esri. I can use RAND() but I know what I produce then ...
0
votes
0answers
7 views

Is Moran 1 Point process analysis? [on hold]

I use arc software to do Moran 1 analysis and it only takes polygons for input. Why is it called point process of only takes polygons?
0
votes
0answers
12 views

Joint PDF of ordered statistics [on hold]

Let $Y_1 < Y_2 < … < Y_n$ be the order statistics of $n$ independent observations from a continuous distribution with cumulative distribution function $F(x)$ and probability density ...
0
votes
0answers
8 views

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 ...
1
vote
1answer
24 views

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 ...
0
votes
1answer
37 views

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 ...
0
votes
0answers
17 views

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?
0
votes
0answers
3 views

How to use LSUV initialization in tensorflow?

How to use LSUV initialization in tensorflow? Tensorflow variable seems only have those few initializer.
2
votes
1answer
20 views

How to deduct the coefficient of the Dirichlet distribution?

I am studying the textbook Introduction to Probability Models by Sheldon Ross. In Section 3.6 page 151 (10th edition), the author uses the Dirichlet distribution to deduct the coefficient of a ...
0
votes
0answers
9 views

Analyzing groups across time points in GraphPad

I have a dataset consisting of measurements of the level of 28 biomarkers for each of 25 people at 7 time points (4900 measurements in all, minus a few blanks). Each person is in a certain group ...

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