All Questions

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0answers
2 views

Conjugate Distribution for Tracy-Widom Distribution?

Does anybody know if there is a distribution conjugate to the Tracy-Widom (in the Bayesian context)?
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0answers
3 views

proving the asymptotic distribution of the mean

Let ${X_t} = \mu + \sum\limits_{j = - \infty }^{ + \infty } {{\psi _j}{\varepsilon _{t - j}}}$ with $\varepsilon$ is a white noise iid with variance $\sigma^2$ , $\sum\limits_{j = - \infty }^{ + ...
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0answers
6 views

What is bootstrapping

The bootstrap is a resampling method to estimate the sampling distribution of a statistic. This is what the tag description says on this website. I am a layman, can someone please help me understand ...
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0answers
6 views

NLP- Sentiment analysis

Most of solutions are based on training classifier to detect the sentiment of text. I am trying to analyze political reviews, I don't wanna divide my data on train/Test. What is the approach that ...
0
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0answers
5 views

Unsupervised learning algorithems to detect anomaly in waves

I have a sample of graphs (more then 10000...). that look like in the image below: I am searching an Unsupervised learning algorithems thet can help me to detect Anomaly observations. Here what i ...
0
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1answer
11 views

Fisher information always 0? What's wrong with this argument?

We exchange derivative and integral while proving that the expected value of the score is 0. Here is the proof which does so: \begin{align*} \int \left( \frac{\partial}{\partial \theta} \log ...
0
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0answers
8 views

How to evaluate this double summation (for a WLS regression) in MATLAB?

I asked this question a few days ago but deleted it as I thought I had solved the issue. I now realise that I had underestimated the problem at hand. The question is based on Ahn and Powell's (1993) ...
1
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0answers
2 views

Sample modification or weighting for partially paired data?

I want to analzye age and gender related differences of serum levels of an antibiotic agent, which was administered to 1200 patients during 1700 infectious episodes (1-12 infectious episodes and thus ...
0
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0answers
5 views

How can one go about recognizing a kind of motion using 3D depth data?

I'm using a Kinect device, and I'm currently extracting Joints, and Depth data unto probably a buffer data of 15 frames. This is done at 30 frames per second. The whole point of it is to try and ...
1
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0answers
9 views

Justifying the use of finite population correction

Given the fact the finite population correction effectively reduces the standard error of the sampling distribution, which (compared with the lack of a finite population correction) will increase the ...
0
votes
1answer
12 views

correlation and constant variable problem

I want to know if word length has an effect of being remembered or not by students. I conducted a test and entered each word as dichotomous variable (0-1, not remembered-remembered). However word ...
0
votes
1answer
10 views

Are VAR and VEC models theoretically neutral?

I have recently been introduced to Vector Autoregression (VAR) and Vector Error Correction (VEC) models in an Econometrics class, where both approaches were presented as a neutral way to test economic ...
0
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0answers
3 views

How to interpret standard errors and t-values in error-correction terms?

When estimating a Vector Error Correction (VEC) model in EViews, the resulting output always shows the error-correction terms together with standard errors and t-values for the included variables, and ...
0
votes
2answers
15 views

number of principal components for classification

I am working on neural networks and I am currently creating a perceptron that will work as a classifier for a data set of images with faces. I am required to perform pca (principal component analysis) ...
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0answers
6 views

Counting how many times some query parameters occur together

My web site logs which criteria was given by each search query. A typical line in this log file looks like x=foo&y=bar&z=baz, which means the user provided ...
0
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0answers
7 views

Minitab need help [on hold]

I need to create a comparison histogram using minitab. Anyone can teach me to the steps in doing that? EG
0
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0answers
16 views

Stochastic measuring of Poisson process

Railroad cars' lengths are distributed by $exp(\lambda)$. The train has n cars. We're standing $t$ length units from the beginning of the train, and we are measuring the car's length. What is the ...
0
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0answers
14 views

ANOVA result with insignificant factors

I'm having difficulty interpreting the result I get from ANOVA. Specifically, if some of the factors I put into the model have an insignificant impact (p-value > 0.05) on the output, does it mean I ...
0
votes
1answer
7 views

How to understand the “arriving rate” in a homogenous Poisson process?

We know that when the arriving rate of a Poisson process $X(t)$ becomes constant, then the process becomes a homogenous Poisson process. I have trouble understanding what "a constant arriving rate" ...
0
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0answers
18 views

A better fit for sinusoidal data

I have been struggling to fit my data to a sine curve. My data looks like: frame = data.frame(hour = c(0, 1, 2, ... 24), value = (numbers between 0 and 500)) I ...
0
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0answers
11 views

Area of Opportunity in C chart and U chart

In the article whether to use C chart of U chart is determined by area of opportunity.But I don't understand what is meant by area of opportunity and how it relates to C chart and U chart.Can ...
0
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0answers
8 views

R- Cost function in glm

I need to introduce a cost function in a logistic model (I'm using R). As I saw from this question, we can introduce costs in cv.glm. But I don't know how to introduce it in glm. My cost function ...
0
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0answers
12 views

[SOLVED]Is there a name for this simple discrete distribution? [duplicate]

I'm just wondering if there's a name for the distribution described by the following p.m.f $$p(n) = n(1-s)^{n-1}s^2$$ where $n$ is an integer from $1$ to $\infty$ and $0\lt s\lt1$. Thanks.
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0answers
6 views

Estimating mortality using Cox model with baseline

I have been reading online notes and papers on how to build survival models using CPH, and I think I've a good idea how things work. However, there are two questions I still have in mind: 1) let's ...
0
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0answers
9 views

Finding n and c in single sampling plan

I am learning a quality control course and in Single sampling scheme for attribute type inspection I don't understand the method used for calculating the values of $n$ and $c$. The method is as ...
0
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0answers
7 views

Error: could not find function “rxGetOption” in Revolution R Open [on hold]

I downloaded and installed Revolution R Open. Current Version of R is 3.1.1 (2014-07-10) -- "Sock it to Me" and version of Revolution R Open is 8.0 beta. I have started basic tutorial from converting ...
0
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0answers
6 views

In R, using glm to model call counts in treated/not treated forests

Ok, so I'm new to using R and trying to learn this on my own because my uni doesn't have a prof who uses R. I've tried googling for answers, and I feel like I'm sort of getting answers, but I'm still ...
0
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0answers
12 views

Bimodality after Box-Cox Transform [on hold]

I have a data set that I need to transform to make it look more normal. This data will not be modeled using linear regression since it is not possible to measure response data. Instead, we are using ...
-1
votes
0answers
12 views

how do we compare two lognormal distribution for p value in R? [on hold]

In taguchi experiments i have single value of S/N ratio considering both mean and standard deviation. Similarly i am looking for lognormal / weibull distribution to comparing two data sets.
0
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0answers
7 views

Matlab: How to implement inverse of determinant of covariance-variance matrix

I have asked this Question http://stackoverflow.com/questions/27068927/matlab-variancecovariance-matrix and repeating it here because I am unsure where it will probably get an answer. When solving ...
1
vote
1answer
19 views

What is the value of “X” in a regression equation when dealing with a time series?

I am using excel to add a polynomial trend line to a chart. The chart and the formula of the trend line are shown below. I want to add lines indicating different confidence intervals so I need to find ...
0
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0answers
3 views

error message while doing surv_test [migrated]

I am trying to fit surv_test to a Surv object Surv(time, event==1) inorder to do an exact ...
0
votes
0answers
29 views

Matlab: Unable to understand expectation operator in the context of a vector

I have a time series model y(t)= h^T y(t-1) + n(t) where n(t) is a white Gaussian noise that excites and drives the process. There is a relation given by: ...
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0answers
6 views

Multiple comparisons of proportions using complex survey data using SAS

I am interested in doing multiple comparisons of proportions using complex survey data in SAS. I can get estimates using proc surveyfreq or proc crosstab (using SAS-callable SUDAAN), but am not aware ...
4
votes
2answers
92 views

How do residuals relate to the underlying disturbances?

In the least squares method we want to estimate the unknown parameters in the model: $$Y_j = \alpha + \beta x_j + \varepsilon_j \enspace (j=1...n)$$ Once we have done that (for some observed ...
2
votes
2answers
18 views

Best algorithm for association rule mining

I am working on an application where I have to extract or identify association / correlation between different sets of items. An example would be say if a person buys shoes at a store, would he/she ...
0
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0answers
22 views

Coefficient of determination contradicts the normalized RMSE

I have a model that allows me to estimate the values of a signal and I’m testing it under different environmental conditions. To compare my estimated signal to the real (reference) signal I’m using ...
1
vote
0answers
18 views

Two-Step estimation

I am currently trying to fit a model that has the following properties: (1) data for several years (2) two decisions/equations (probably involved): (a) one that explains an initial choice of product ...
0
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0answers
27 views

Linear regression with log dependent variable

I have the following regression: $log(Y) = \alpha + \beta X + \epsilon$ with $E[\epsilon] = 0$ and $var(\epsilon) = \sigma^2$. There is no assumption on the distribution of the errors $\epsilon$. In ...
0
votes
0answers
15 views

Formula the conditional probability of marbles [on hold]

I have a interesting question that need your help. I have two sets A and B. Set A have 10 marbles that numbered from 1 to 10. Set B have 6 marbles that numbered from 1 to 6. Randomly choose $g$ ...
0
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0answers
25 views

How to interpret redundancy?

I have trouble making sense (i.e. real-world sense…) out of some of my results. I have Y and X1 and X2 for different geographic areas. Meaning they are the same variables, but their actual values are ...
1
vote
0answers
19 views

Y vs X with spatial variation

I am trying to learn a relationship between two variables Y and X, X is the independent variable. The nature of the relationship is quadratic, from some domain experience, but the relationship itself ...
0
votes
2answers
23 views

Choosing samples of different sizes - considerations?

Let's say I have four populations with the sizes 2451, 2117, 7577, and 1545. Each of these are sets of activity sequences on which I do sequence analysis. Based on this I want to do clustering based ...
1
vote
1answer
28 views

Improving a regression model based on diagnostics

I have two continuous predictors ($x_1, x_2$) in my data set and a continuous response variable $y$. The data set is by date for 6 quarters. Since I observed a clear pattern of surge during weekday ...
1
vote
1answer
25 views

How do I interpret the p value returned in scipy's Mann Whitney U test?

I have a program in which I need to perform an action based on what results of a Mann Whitney U test are. I know the criteria that need to be met, but I would still like to understand what the results ...
0
votes
1answer
21 views

Salary Range Determination When Given Percentiles

Can one determine an accurate salary range (minimum, mid and maximum) if only provided the 25th, 50th and 75th percentiles?
1
vote
0answers
22 views

Multiple, multiple regressions?

I have done a study on whether personality and demographics predict interaction on Facebook brand pages. I have used a Big five personality scale and the demographics include, sex, age, marital ...
2
votes
0answers
10 views

Baseline for Precision-Related Metrics

When working with ROC-AUC as a metric for binary classification, one often considers a value of 0.5 as a baseline from a random classifier (i.e. a data-blind classifier that randomly classifies test ...
0
votes
0answers
17 views

what is the best method of smoothing time series for product share data?

I am having a share data for products presribed over period of time.The share is calculated like for 3 products each one 1/3 share and like that,where products may vary and hence their share. What is ...
1
vote
1answer
12 views

Marginal Likelihoods for Bayes Factors with Multiple Discrete Hypothesis

If I have some data that I believe is Normally distributed and I just want to test the hypotheses that the mean is equal to 1 of 3 values, my understanding is that the Bayes Factor is the ratio of ...

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