All Questions

I am playing with Deep Recurrent Q-Network in Reinforcement learning. The architecture I am currently using is similar to the one presented in "Human-level control through deep reinforcement learning"...

Below graphs are birthrate, deathrate, population and population_growth of all the countries in the world. I don't know how to clearly understand these plots. I don't know what are xaxis and y axis ...

I have created UDF Function in R and I want to apply that function in Outside the function, please help me is it possible to do it ?. please explain me to give some example. Thanks Dev

I'm reading faster RCNN paper now and trying to understand what is the difference between Pyramid of Filters and Pyramid of Anchors methods from the scale point of view. I mean if I use only one ...

When we set a batch-size, after each sample of batch passed we take the gradient but wait until last sample of batch to passed and then propagate the sum of gradient of them through the network? Am I ...

I have used lrm in the RMS package to construct a logistic regression model with several interaction terms for a recent paper. As part of my strategy, I decided to use Wald Chi-squares on factors ...

For June 2009 - June 2018, I have prices for product to be delivered that month if bought on the date on the left most column. This below is an excerpt to show the format. The 1-5 and so on r between ...

I'm reading a paper here that uses a Probit Regression. I'm not entirely familiar with how this works. But, I'm wondering if there's a way to use the coefficients from Table 3 to derive the ...

I would like to know whether there is any condition that using one cluster evaluation methods (Dunn, Silhouette, Davies-Bouldin) is better than others. I didn't find anything online or inside books, ...

Can anyone give me some insight into where this calculation for the KS test statistic is going wrong (see figure 1)? I ran the test in SPSS and SAS as a check. I have used the same process for other ...

To get design values (the strength of something, for example) designing to Australian/ New Zealand loading code you do $n$ tests and estimate the coefficient of variation of your parent population, $...

I will try to write my problem as accurate as possible, sorry if I forgot to say something. I have 5 numeric variables of 2 populations (each of them with 60 individuals) and for each of those 5 ...

I know that KL divergence measures difference between two probability distributions. My doubt is for which of the distributions it could become Infinity, putting it in another way, ...

I am working with a pre/post test structure, measuring dichotomous outcomes. I am using GEE to estimate the coefficient for time (also a binary variable, 0 representing pre and 1 representing post), ...

I am newbie to WLS regression topic. I am being asked to fit a line to a data using WLS. I am working in minitab. My data is as follows: cost (independent variable) (x-axis); production (dependent ...

I have a question whether Granger causality test can be performed if one of the variables is a dummy. I have two variables one continuous variable and then a dummy for an event that is 1 during the ...

I would like to measure by how much the standard deviation decrease when I add funds in a VC fund portfolio. Lets supose I have the returns obtained by 400 VC funds. With that information I can ...

I have physiological time-series data: ~60k observations per channel, ~100 Hz sampling. I will model individual channels with ~20 regressors. Under OLS, given temporal autocorrelation in the data, ...

At the end of the PCA algorithm one gets a matrix $U$ (Dxd) such that $z=U^Tx$ (x - D dim.; z - d dim.), $d\leq D$. In multiple sources on the Web I found that $U$ or $U^T$ is named "projection matrix"...

I'm doing some distribution fitting work and I'm looking at Q-Q plots and how they can be used visually to interpret goodness of fit. My data is heavy-tailed so I am looking at Weibull, log-normal, ...

I am observing emails in our online shopping website email address. Some of the emails are spam because they contain hyperlinks, contain information which are not related to our products and some ...

I am venturing into area of log file analysis and trying to make sense of thousands of log files generated during regression testing. The log files have messages from a global set. Each log file is ...

I am looking to design an experimental framework for assessing the impact of specific marketing interventions (in this case, consumer participation in an event) on downstream consumer behavior (e.g. ...

What is the probability of Stock B having a return less than 6%? Facts: 15% average return for the holding period, standard deviation of 9%.

Extreme measures require principled quantification of the error bars on such measures because of sample size limits. A statement like "90% of scores will fall between X and Y." is of a different ...

I am facing a problem. It's a multiclass classification problem I have 5 categories A has 107 instances B has 101 instances C has 882 instances, D has 229 instances and E has 129 instances. I used Knn,...

I have a question about error propagation. The figure below shows HDD as a function of temperature. I have determined a minimum in HDD (approximately 1 at approximately 11 degrees) with corresponding ...

I encountered several regression problems in the field of engineering that are formulated similar to the following form (I will ommit the error terms): $$ y=a_0+a_1(x_1-c_{ref})+a_2\ln(x_2/d_{ref})\,,...

I have a graph of the Cosine distance between the question and the sentence most similar to it when there is an answer and when there is none. I want to establish a threshold on the abscissa axis ...

I am considering a model where I have repeated/longitudinal measures over a number of timepoints from baseline (probably evenly spaced - perhaps with 2 groups) and I assume a random intercepts and ...

I was trying to run a study with 100 people per condition for 4 conditions. When I looked at the results, the group sizes were skewed - some had 80, some had 120. If I'm planning on running a series ...

I have two physiological data sets coming from two different populations entering the same experiment which includes two IV; Drug vs Placebo (2 level; between-subj) Stimulus type (3 levels; within ...

I am having trouble understanding what the Wald Chi Squared test is used for intuitively. SPSS uses the Wald Test (type III) in the "Tests of Model Effects" box when I run my GEE models, but I don't ...

Suppose you are building random forest model, which split a node on the attribute, that has highest information gain. In the below image, select the attribute which has the highest information gain? ...

I have a case where I'm doing text mining over a list of product titles. In particular I want to run a clustering algorithm. But I also have some information about those products that I think can add ...

Over a time period of 1 year, half hourly wind speed data is collected. Is it false to state that the collected data is not-iid? I know that wind is seen as a non-stationary process, but does it also ...

I'm trying to use quantile regression to solve an areal interpolation problem as described in this paper: https://www.tandfonline.com/doi/abs/10.1080/00045608.2011.627054 Basically I have a set of ...

My target has 5 classes. My testing dataset has an accuracy of about 34%. Can I assume this is a reasonable model purely based on classification accuracy, since random guessing is 20%.

I would like to classify a mail (spam = 1/ham = 0), using logistic regression. My implementation is similar to this implementation and using tensorflow. A mail is represented as a bag-of-words ...

I am quite new to this kind of topic, but for my master thesis i built an multiple linear regression with OLS. Now I want to control for non-linear relationships using a semi-parametric GAM. My ...

I used 2 methods to predict the Survival time of patients. I used the Concordance index (C-index) to evaluate the performance of prediction. I wanted to test if the prediction performance for the ...

Can a Probability Mass Function can have value greater than 1 like we have in Continuous functions(pdf) and why? Please give 1 example if the answer is yes. And If the answer is no then why PDF can ...

I'm currently in the process of analyzing experimental data and would like to hear your opinion on the method I would like to use to test my hypothesis. I had an experimental setup where I recorded ...

I have multiclass classification dataset and I am using Deep nets for the classification task. To explain the problem, let's assume that I have 5 classes to classify. No matter what I try, be it ...

we'd like to conduct a study about the perceived valuation between two persons (let's say A and B that have different characteristics). Therefore, for our dependent variable, we'd like to ask ...

I'm investigating survival in a cancer patients cohort. The Cox model I'm using is stratified by stage and adjusted for several variables. I would like to add one variable RT (Radiotherapy) which is ...

let I be a set of random input values, with I = N . Then h meets this quality criterion if (∀1 ≤ i ≤ n)(|h(I) ∩ Pi| ≈ N/n ) if N >> n. Suppose you want to use Employee numbers to calculate a hash, ...

Something I've allways wanted to see is a concise run-through of different machine learning algorithms, all on one page: With their pros and cons, what situations they work in best and when they don'...

How to test reliability in nominal data? MY dependent and independent variables are both in ordinal data. I have to find out the contribution of independent variables in dependent variables. is it ...

I'm new to ML stuff and one of the thing that I don't understand about CNN, is that why CNN have to find the values of filter at convolution layer, why don' they use existing filters and only find the ...