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Forum: Applied Statistics

Statistics in finance, economics, engineering. Actuarial science. Econometrics. Operations research.

  1. Bayesian (structural) VAR model problems

    Hello, I will use a bayesian structural vector autoregressive model for a macroeconomic paper. It is very hard to find answers to many questions in...

    Started by schteeke1‎, Yesterday 06:57 AM
    bayesian var lag length
    • Replies: 0
    • Views: 35
    Yesterday, 06:57 AM Go to last post
  2. copula-based VaR calculation in R

    I'm working on a value-at-risk calculation using copulas on different stock market indices. I know how to fit the copula, but I can't figure out how...

    Started by maaarten9‎, 04-23-2017 11:24 AM
    copula, rsoftware, value at risk
    • Replies: 0
    • Views: 79
    04-23-2017, 11:24 AM Go to last post
  3. 2-D scatterplot question...how to assign a single numerical value to each data point

    Greetings, I am building and looking at scatterplots comparing two different sets of data. I would like to be able to compare the data using a...

    Started by SBF12345‎, 04-20-2017 05:46 PM
    • Replies: 0
    • Views: 135
    04-20-2017, 05:46 PM Go to last post
  4. Calculating median category

    I have ordered categories (e.g., 0-3 months, 4-6 months) and the number of customers who were in each category (say 45 in the first 50 in the second,...

    Started by noetsi‎, 04-17-2017 05:51 PM
    • Replies: 0
    • Views: 148
    04-17-2017, 05:51 PM Go to last post
  5. How to segment customers by demographic data to maximize profit?

    I have a data set with profit for each customer (in some cases it is negative) as well as various demographic categorical variables (gender, age...

    Started by tennisfan‎, 04-17-2017 09:36 AM
    customer analytics, demographics, maximization, profit
    • Replies: 2
    • Views: 138
    04-17-2017, 01:17 PM Go to last post
  6. Lightbulb Baseball Stats: Using Multiple Factors With Variable Ranges As Input

    Hello, I am working on creating a statistic to predict players most likely to get a hit on any given day. In this statistic, I am using five...

    Started by Eric Alan‎, 04-12-2017 10:45 PM
    baseball, multiple data sets, normalize dataset, range, weighted
    • Replies: 0
    • Views: 147
    04-12-2017, 10:45 PM Go to last post
  7. Manova

    I have at least 20 recipes each with 8 different chemicals. each of these 20 recipes produces at least 2 outcomes that is dependent varaibles. What...

    Started by madyira‎, 04-10-2017 09:35 AM
    • Replies: 1
    • Views: 171
    04-10-2017, 10:03 AM Go to last post
  8. How to amend one variable in a Full Factorial Design during experimentation

    I have a 2 level, 4 factor DOE set up for 16 runs. These are all continuous factors. I'd like to amend one of the factors to a narrower range. I am...

    Started by redrover123‎, 04-07-2017 04:46 PM
    • Replies: 4
    • Views: 237
    04-10-2017, 06:48 AM Go to last post
  9. Fundraising Evaluation Design

    I work for a nonprofit that is hoping to determine whether or not certain corporate parameters are correlated with joining our organization as a...

    Started by clcrabtr‎, 04-03-2017 08:55 AM
    • Replies: 3
    • Views: 245
    04-03-2017, 10:28 AM Go to last post
  10. Question on forecast combinations

    Hi All, Say I have a variable Z that I believe can modelled/forecasted via two different thematic models in the standard regression form: E1 =...

    Started by nomadzero‎, 04-03-2017 04:07 AM
    • Replies: 0
    • Views: 105
    04-03-2017, 04:07 AM Go to last post
  11. Hodrick-Prescott issue

    Hi, I'm building a Leading Indicator for the economic cycle similar to the OECD's (http://www.oecd.org/std/leading-indicators/), so I use...

    Started by pgrign‎, 04-03-2017 03:01 AM
    • Replies: 0
    • Views: 114
    04-03-2017, 03:01 AM Go to last post
  12. graduating multi-decrement tables

    I need to construct a multi-decrement table and I've had much success withestimation of crude rates, but now I feel that I need to graduate the rates...

    Started by chippy‎, 03-28-2017 10:57 AM
    decrements, estimation
    • Replies: 2
    • Views: 244
    04-01-2017, 11:54 PM Go to last post
  13. What do statistical tests really do

    The background. We generated customer to counselor ratios for our counties (these are population data not a survey. That is we queried all our...

    Started by noetsi‎, 03-02-2017 03:27 PM
    3 Pages
    1 2 3
    • Replies: 43
    • Views: 2,473
    04-01-2017, 11:50 PM Go to last post
  14. Measuring the effect of in-store Promotions

    Hello, I am testing the effect of a new in-store promotion technique (treatment). It is applied during product promotions, as a compliment to...

    Started by KARPOS‎, 03-30-2017 11:58 AM
    applied statistics, confidence interval, probability, regression model
    • Replies: 1
    • Views: 160
    04-01-2017, 11:38 PM Go to last post
  15. log(0) should have a real value!!!

    Dear all, Ive been stuck for quite some time with a problem that relates to use of log-scale with values that equal zero. My data comes from...

    Started by ritmaniac‎, 03-21-2017 07:04 AM
    anova, censoring, linear regression, log scale, log transformation, logarithmic
    • Replies: 4
    • Views: 306
    03-27-2017, 11:27 AM Go to last post
  16. Is R square useful at all?

    I know it can not be used in non-linear regression at all but I found this comment a bit shocking given how commonly R square is in the literature....

    Started by noetsi‎, 03-20-2017 02:47 PM
    r^2
    • Replies: 11
    • Views: 451
    03-26-2017, 11:32 AM Go to last post
  17. When the central limit theorem works...and when it doesn't?

    I had always thought that given say a 100 cases the central limit theorem always worked. But today I read (in a book about multilevel analysis)...

    Started by noetsi‎, 03-20-2017 11:35 AM
    • Replies: 10
    • Views: 349
    03-22-2017, 06:09 PM Go to last post
  18. Multiple hypothesis testing

    I am reading one of those books that make my head hurt, because it raises many issues and disagrees with what to me is established views on a topic...

    Started by noetsi‎, 03-20-2017 12:02 PM
    • Replies: 10
    • Views: 395
    03-22-2017, 02:11 PM Go to last post
  19. Question comparison of multivariate (4 DV and 1 IV) datasets (data matrices)

    I want to compare 06 different Multivariate datasets (data matrices). Each dataset consists of SAME number of columns but different number of rows....

    Started by waqasurrehman‎, 03-20-2017 05:51 AM
    multivariate, pca analysis
    • Replies: 0
    • Views: 179
    03-20-2017, 05:51 AM Go to last post
  20. Good measure of non-linear correlation

    Many of the measures of correlation, notably pearson but I think Spearman rho as well, do not measure non-linear relationships well. Are there any...

    Started by noetsi‎, 03-17-2017 02:22 PM
    • Replies: 5
    • Views: 374
    03-18-2017, 03:50 AM Go to last post
  21. Question Conditional Multi-variate Normal Distribution

    Dear all, I would like to find a computationally quick and sufficiently accurate way (i.e., either analytically or numerical approximation) to...

    Started by sdj‎, 03-17-2017 05:03 PM
    conditional density, multivariate normal
    • Replies: 0
    • Views: 218
    03-17-2017, 05:03 PM Go to last post
  22. Bootstrapping 0.632+ AUC with fixed test sets

    Hi, I want to compare different binary classifiers in terms of their AUC values on test sets. I have data over one year with about 2000...

    Started by Mkkl‎, 03-11-2017 06:00 AM
    auc, bootstrap, efron, fixed, test set
    • Replies: 0
    • Views: 292
    03-11-2017, 06:00 AM Go to last post
  23. Question How to assign new data to an existing clustering

    This is the situation. First, I performed factor analysis on 20 continuous variables, and reduced those to 10 factors using SPSS. Then, I did...

    Started by wmacooper‎, 03-08-2017 11:06 AM
    cluster analysis, factor analysis, prediction model, spss
    • Replies: 0
    • Views: 337
    03-08-2017, 11:06 AM Go to last post
  24. Using the Excel Rand() Function in Sampling

    I have quick question with regards to using the Excel's Rand() function. Please see the below link for the excel spreadsheet example. My...

    Started by R2015‎, 03-07-2017 09:58 AM
    • Replies: 1
    • Views: 218
    03-07-2017, 10:42 AM Go to last post
  25. Looking for feedback on application of chi-square test

    I am a cost engineer working in the building construction field. I am seeking some advice/feedback on the use of a chi-square test for assessing how...

    Started by Pickle57‎, 03-03-2017 11:38 AM
    chi-square help, multinomial
    • Replies: 5
    • Views: 387
    03-04-2017, 02:14 PM Go to last post
  26. Proof of Kalman filter related lema

    Hi... Can you please provide a proof of the formula given on the attached image?

    Started by liqokeli‎, 03-03-2017 09:36 AM
    • Replies: 0
    • Views: 226
    03-03-2017, 09:36 AM Go to last post
  27. Help with measurement system analysis with destructive samples

    Hello everyone, I am an internship student and for my company I have to develop a method to test if their material is brittle or not. They bought...

    Started by biochem95‎, 02-28-2017 07:46 AM
    gage r&r, minitab, msa
    • Replies: 2
    • Views: 349
    03-02-2017, 01:35 PM Go to last post
  28. Deciding what distribution to use in a monte carlo distribution (business)

    I am not working on a specific problem right now - just learning how to do monte carlo for business uses (so I am not testing a specific statistic,...

    Started by noetsi‎, 02-28-2017 03:59 PM
    • Replies: 6
    • Views: 560
    03-01-2017, 11:18 AM Go to last post
  29. What type of analysis is this?

    This is exactly the type of analysis I need to learn to do, but I don't know where to look for it. Is it finance, operations research, planning.... ...

    Started by noetsi‎, 02-28-2017 04:25 PM
    • Replies: 3
    • Views: 474
    03-01-2017, 09:18 AM Go to last post
  30. Exercise on standard distribution

    Hello, Suppose I want to calculate the probability for a user to pass from a basic to a premium account within the end of Q1 (i.e. end of march). ...

    Started by faber1999‎, 02-26-2017 10:35 AM
    gaussian distribution, normal distribution, probability estimate, standarddeviation
    • Replies: 0
    • Views: 581
    02-26-2017, 10:35 AM Go to last post
  31. An average of standard deviations?

    Hello, My apologies if this isn't the correct forum for this, but I'm trying to analyze some data and can't figure out how to obtain an accurate...

    Started by indoze‎, 11-05-2010 08:53 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 178,440
    02-23-2017, 10:18 AM Go to last post
  32. Monte Carlo simulations

    I am not using this to test the results of violations of statistical assumptions or the like. I am using it to analyze business issues for which no...

    Started by noetsi‎, 02-10-2017 04:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 1,717
    02-22-2017, 03:15 PM Go to last post
  33. Lightbulb How to compare two PCA vectors - classification and clustering problem

    Dear all, Assume I have one reference PCA vector and two sample PCA vectors, all of the same length. I want to know which of the two sample PCA's...

    Started by horek‎, 02-22-2017 02:46 PM
    principal components
    • Replies: 0
    • Views: 337
    02-22-2017, 02:46 PM Go to last post
  34. interpreting random effects in a GLMM

    I just want to check with everyone about my interpretation of a model results. I am beginning to second guess myself so I want to make sure I am...

    Started by the42up‎, 02-21-2017 09:02 PM
    • Replies: 0
    • Views: 380
    02-21-2017, 09:02 PM Go to last post
  35. Generalized Linear Models

    Anyone know a good introductory book or books on Generalized Linear Models. I have worked with these before, but need to learn them better. I am...

    Started by noetsi‎, 02-10-2017 02:38 PM
    • Replies: 1
    • Views: 513
    02-19-2017, 04:10 PM Go to last post
  36. [SOLVED] very simple logic question

    This is probably the simplest question ever asked here.....:shakehead I have been asked for the average time customers spent in a given service. ...

    Started by noetsi‎, 02-16-2017 05:30 PM
    • Replies: 4
    • Views: 731
    02-17-2017, 05:07 PM Go to last post
  37. Time series thread

    These don't get much attention now that vinux is rarely here.... In ARIMA models you sometimes have to test for seasonal non-Stationarity. One way...

    Started by noetsi‎, 01-14-2017 01:51 PM
    • Replies: 12
    • Views: 1,800
    02-02-2017, 11:34 AM Go to last post
  38. Mixing populations

    I'm not al that familiar with statistics, so I hope I use the correct terminology. In most materials you get some normal distribution of the values...

    Started by Descobar‎, 01-30-2017 07:28 AM
    • Replies: 12
    • Views: 894
    02-01-2017, 03:15 AM Go to last post
  39. Smile Comparing subsets of a population with a very different size (power law case)?

    My population (12000 data) is characterized by events that are either of type A or of type B. My goal is to figure out whether the relative...

    Started by angy‎, 01-30-2017 05:11 AM
    power law, proportion, statistical significance
    • Replies: 0
    • Views: 536
    01-30-2017, 05:11 AM Go to last post
  40. Calculating Optimal Level of Maintenance Spend

    New to this forum and my stat skills have gotten quite rusty since earning my six sigma bb 8 years ago. Coming here to Basically I want to figure...

    Started by TollemG‎, 01-19-2017 09:41 AM
    • Replies: 7
    • Views: 1,305
    01-27-2017, 03:46 PM Go to last post
  41. Standard deviation for final results

    Hi, I have several groups of samples which each group has own average and SD. I use the average of each group to calculate the difference between...

    Started by Neos‎, 01-27-2017 07:16 AM
    average, standard deviation
    • Replies: 0
    • Views: 549
    01-27-2017, 07:16 AM Go to last post
  42. Question Applying Principal Coponent Analysis to Exchange Profit of a company

    Hi, I have monthly exchange profit of a company for last 10 years period and daily exchange rates for 10 year period. I want to identify what...

    Started by John267‎, 01-24-2017 06:05 AM
    • Replies: 0
    • Views: 588
    01-24-2017, 06:05 AM Go to last post
  43. Comparing different optimisation agorithms on multiple test functions

    Hi, I'm trying to compare the performance of 4 optimisation algorithms on over 30 fitness functions. Due to the nature of the algorithm variations I...

    Started by JoeWright‎, 01-21-2017 07:10 PM
    • Replies: 0
    • Views: 681
    01-21-2017, 07:10 PM Go to last post
  44. Re: Permanova design for BACI study (using Primer)

    Hello everyone I am a beginner with PRIMER, could anyone help me in designing my PERMANOVA please... I have unbalanced BACI design as following: 2...

    Started by Ahmed Faraj‎, 01-19-2017 03:56 PM
    • Replies: 1
    • Views: 731
    01-19-2017, 05:11 PM Go to last post
  45. Empirical method for % training test

    When I am determining a percentage training test sets is there an emprical way to determine this?

    Started by trinker‎, 01-18-2017 12:29 PM
    • Replies: 6
    • Views: 920
    01-18-2017, 10:50 PM Go to last post
  46. Forcast changes in th failure rate while considering feedback loop of failed "entity"

    Hi there How would you forecast changes in the failure rate of an assembly line if failed modules are fed back into the assembly line? If a...

    Started by Alex2605‎, 01-18-2017 11:23 AM
    assembly process, failure rate, feedback loop
    • Replies: 0
    • Views: 678
    01-18-2017, 11:23 AM Go to last post
  47. Two effects, but not enough samples - what statistics can I do?

    Dear all, I made measurements of oxygen consumption (VO2) during steady state running with 3 different shoes. The runs were performed in 5 series...

    Started by Jurij‎, 01-17-2017 08:46 AM
    linear model, two effects
    • Replies: 2
    • Views: 820
    01-18-2017, 03:22 AM Go to last post
  48. Accuracy calculation

    Hi all, This is probably basic stuff for some of them but it's the first time I come across this type of problem. I need to demonstrate that the...

    Started by mgubellini‎, 12-19-2016 12:12 PM
    • Replies: 2
    • Views: 1,126
    01-16-2017, 03:29 AM Go to last post
  49. Modern approaches to identifying ARIMA models.

    I have read there are new, somewhat automated, approaches to identifying the correct ARIMA (p,d,q) model. The only one I know of is the use of the...

    Started by noetsi‎, 01-14-2017 01:12 PM
    • Replies: 1
    • Views: 862
    01-15-2017, 12:27 PM Go to last post
  50. Books articles on simulation

    I want to learn how to simulate data . Anyone know any good introductions to this?

    Started by noetsi‎, 01-09-2017 05:31 PM
    • Replies: 7
    • Views: 1,138
    01-10-2017, 01:43 PM Go to last post
  51. Explaining outliers statistically

    Something which draws attention a lot here is how to explain outliers we discover . I was wondering if anyone here had been involved in analyzing...

    Started by noetsi‎, 01-09-2017 02:50 PM
    • Replies: 2
    • Views: 939
    01-09-2017, 05:17 PM Go to last post
  52. Goodness of fit tests

    Hi there, Adding to my previous questions: 1. Why do I need goodness of fit test? I mean when I get a set of data should I always suggest a...

    Started by Abubaker‎, 01-08-2017 06:21 AM
    goodness of fit, hypothesis testing, modeling techniques
    • Replies: 0
    • Views: 959
    01-08-2017, 06:21 AM Go to last post
  53. Statistical inference

    Hi there, I would like to ask a couple of basic questions: 1. What is the difference between estimation and hypothesis testing? I mean are they...

    Started by Abubaker‎, 01-08-2017 05:06 AM
    applied statistics, estimation, hypothesis testing, inference, model selection
    • Replies: 0
    • Views: 795
    01-08-2017, 05:06 AM Go to last post
  54. Which is the better prediction model?

    The aim is to predict the breakdown time of a machine as a percentage of scheduled hours for the next day. So my time series looks like this, ...

    Started by Mukund‎, 01-05-2017 02:23 PM
    • Replies: 6
    • Views: 1,224
    01-06-2017, 04:21 AM Go to last post
  55. Need help with statistics to evaluate a proposed design model

    Hallo guys. I'm a structural engineer and I'm doing a study for my bachelors or maybe masters degree (haven't decided yet for which of them I'll...

    Started by RadekSkylark‎, 01-06-2017 12:45 AM
    • Replies: 0
    • Views: 903
    01-06-2017, 12:45 AM Go to last post
  56. Time Series thread

    Many multivariate time series require variables to be integrated of the same order . My question is what do you do if variables are not integrated of...

    Started by noetsi‎, 12-16-2016 11:55 AM
    • Replies: 13
    • Views: 2,147
    01-04-2017, 01:15 AM Go to last post
  57. Improved MAPE

    It has been suggested that MAPE as a way of evaluating time series forecast has problems and that something called an "Improved MAPE" is better....

    Started by noetsi‎, 01-03-2017 05:58 PM
    • Replies: 1
    • Views: 823
    01-03-2017, 08:27 PM Go to last post
  58. updating ARIMA model

    When should one use the different types of ARIMA model as mentioned below: Estimate the model order in the training data set and use the same...

    Started by Mukund‎, 12-31-2016 09:33 AM
    arima, forecatin, time series
    • Replies: 0
    • Views: 990
    12-31-2016, 09:33 AM Go to last post
  59. Sample Size Estimation Problem

    I am trying to use a program called EZ-Quant to determine a sample size. The program first asks you to choose one of the following options: 1....

    Started by Lakshmee‎, 12-24-2016 11:13 PM
    error rate, ez-quant
    • Replies: 4
    • Views: 1,381
    12-27-2016, 12:50 AM Go to last post
  60. EZ-Quant Sample Size Estimation (question #2)

    I am required to use EZ-Quant Statistical Sampling Tool (program) ver. 1.1.3. It was developed by the Defense Contract Audit Agency but I am not...

    Started by Lakshmee‎, 12-24-2016 11:27 PM
    • Replies: 0
    • Views: 901
    12-24-2016, 11:27 PM Go to last post

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