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Forum: Applied Statistics

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

  1. 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 02:27 PM
    3 Pages
    1 2 3
    • Replies: 40
    • Views: 1,320
    Today, 11:07 AM Go to last post
  2. 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: 203
    Yesterday, 06:09 PM Go to last post
  3. 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: 223
    Yesterday, 02:11 PM Go to last post
  4. 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, linear regression, log scale, log transformation, logarithmic
    • Replies: 1
    • Views: 57
    03-21-2017, 03:17 PM Go to last post
  5. 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: 10
    • Views: 202
    03-21-2017, 01:40 AM Go to last post
  6. 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: 61
    03-20-2017, 05:51 AM Go to last post
  7. 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: 189
    03-18-2017, 03:50 AM Go to last post
  8. 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: 102
    03-17-2017, 05:03 PM Go to last post
  9. 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 05:00 AM
    auc, bootstrap, efron, fixed, test set
    • Replies: 0
    • Views: 149
    03-11-2017, 05:00 AM Go to last post
  10. 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 10:06 AM
    cluster analysis, factor analysis, prediction model, spss
    • Replies: 0
    • Views: 209
    03-08-2017, 10:06 AM Go to last post
  11. 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 08:58 AM
    • Replies: 1
    • Views: 110
    03-07-2017, 09:42 AM Go to last post
  12. 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 10:38 AM
    chi-square help, multinomial
    • Replies: 5
    • Views: 213
    03-04-2017, 01:14 PM Go to last post
  13. 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 08:36 AM
    • Replies: 0
    • Views: 109
    03-03-2017, 08:36 AM Go to last post
  14. 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 06:46 AM
    gage r&r, minitab, msa
    • Replies: 2
    • Views: 169
    03-02-2017, 12:35 PM Go to last post
  15. 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 02:59 PM
    • Replies: 6
    • Views: 331
    03-01-2017, 10:18 AM Go to last post
  16. 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 03:25 PM
    • Replies: 3
    • Views: 238
    03-01-2017, 08:18 AM Go to last post
  17. 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 09:35 AM
    gaussian distribution, normal distribution, probability estimate, standarddeviation
    • Replies: 0
    • Views: 290
    02-26-2017, 09:35 AM Go to last post
  18. 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: 172,215
    02-23-2017, 09:18 AM Go to last post
  19. 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 03:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 1,072
    02-22-2017, 02:15 PM Go to last post
  20. 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 01:46 PM
    principal components
    • Replies: 0
    • Views: 184
    02-22-2017, 01:46 PM Go to last post
  21. 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 08:02 PM
    • Replies: 0
    • Views: 212
    02-21-2017, 08:02 PM Go to last post
  22. 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 01:38 PM
    • Replies: 1
    • Views: 320
    02-19-2017, 03:10 PM Go to last post
  23. [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 04:30 PM
    • Replies: 4
    • Views: 478
    02-17-2017, 04:07 PM Go to last post
  24. 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 12:51 PM
    • Replies: 12
    • Views: 1,040
    02-02-2017, 10:34 AM Go to last post
  25. 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 06:28 AM
    • Replies: 12
    • Views: 518
    02-01-2017, 02:15 AM Go to last post
  26. 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 04:11 AM
    power law, proportion, statistical significance
    • Replies: 0
    • Views: 255
    01-30-2017, 04:11 AM Go to last post
  27. 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 08:41 AM
    • Replies: 7
    • Views: 804
    01-27-2017, 02:46 PM Go to last post
  28. 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 06:16 AM
    average, standard deviation
    • Replies: 0
    • Views: 298
    01-27-2017, 06:16 AM Go to last post
  29. 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 05:05 AM
    • Replies: 0
    • Views: 309
    01-24-2017, 05:05 AM Go to last post
  30. 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 06:10 PM
    • Replies: 0
    • Views: 417
    01-21-2017, 06:10 PM Go to last post
  31. 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 02:56 PM
    • Replies: 1
    • Views: 415
    01-19-2017, 04:11 PM Go to last post
  32. 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 11:29 AM
    • Replies: 6
    • Views: 493
    01-18-2017, 09:50 PM Go to last post
  33. 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 10:23 AM
    assembly process, failure rate, feedback loop
    • Replies: 0
    • Views: 332
    01-18-2017, 10:23 AM Go to last post
  34. 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 07:46 AM
    linear model, two effects
    • Replies: 2
    • Views: 491
    01-18-2017, 02:22 AM Go to last post
  35. 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 11:12 AM
    • Replies: 2
    • Views: 635
    01-16-2017, 02:29 AM Go to last post
  36. 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 12:12 PM
    • Replies: 1
    • Views: 471
    01-15-2017, 11:27 AM Go to last post
  37. 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 04:31 PM
    • Replies: 7
    • Views: 615
    01-10-2017, 12:43 PM Go to last post
  38. 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 01:50 PM
    • Replies: 2
    • Views: 459
    01-09-2017, 04:17 PM Go to last post
  39. 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 05:21 AM
    goodness of fit, hypothesis testing, modeling techniques
    • Replies: 0
    • Views: 518
    01-08-2017, 05:21 AM Go to last post
  40. 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 04:06 AM
    applied statistics, estimation, hypothesis testing, inference, model selection
    • Replies: 0
    • Views: 454
    01-08-2017, 04:06 AM Go to last post
  41. 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 01:23 PM
    • Replies: 6
    • Views: 594
    01-06-2017, 03:21 AM Go to last post
  42. 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, 01-05-2017 11:45 PM
    • Replies: 0
    • Views: 467
    01-05-2017, 11:45 PM Go to last post
  43. 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 10:55 AM
    • Replies: 13
    • Views: 1,294
    01-04-2017, 12:15 AM Go to last post
  44. 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 04:58 PM
    • Replies: 1
    • Views: 480
    01-03-2017, 07:27 PM Go to last post
  45. 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 08:33 AM
    arima, forecatin, time series
    • Replies: 0
    • Views: 550
    12-31-2016, 08:33 AM Go to last post
  46. 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 10:13 PM
    error rate, ez-quant
    • Replies: 4
    • Views: 770
    12-26-2016, 11:50 PM Go to last post
  47. 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 10:27 PM
    • Replies: 0
    • Views: 539
    12-24-2016, 10:27 PM Go to last post
  48. Econometric books

    Does anyone know some good introductory books on econometrics. Much of the methods I am working with seem to be involved with econometrics and I...

    Started by noetsi‎, 12-16-2016 10:44 AM
    • Replies: 10
    • Views: 883
    12-20-2016, 04:08 PM Go to last post
  49. Granger casuality: which kind of variables can you compared?

    Good morning and thanks in advice for your time. Can I use Granger casuality for studying if a financial variable (stock price of a company) can be...

    Started by Giacomo pera‎, 12-14-2016 06:16 PM
    granger casuality, time series analysis
    • Replies: 1
    • Views: 562
    12-15-2016, 04:02 PM Go to last post
  50. Granger Causality test in context of VARMA time series

    This author is generally good, but his comments really confuse me in this case. He is discussing a Granger Causality test - here P=.203. He has two...

    Started by noetsi‎, 12-13-2016 11:56 AM
    • Replies: 6
    • Views: 733
    12-15-2016, 03:52 PM Go to last post
  51. Predicting the level of one variable over another over time.

    After five years of trying to learn a time series approach I can actually run that is not univariate (that is I want to predicts how one variable...

    Started by noetsi‎, 12-06-2016 04:58 PM
    • Replies: 2
    • Views: 819
    12-09-2016, 03:09 PM Go to last post
  52. Extreme values

    I have been tasked for finding extreme values - by calculating outliers in the Tukey boxplot. Our data is not remotely normally distributed (it...

    Started by noetsi‎, 12-08-2016 03:54 PM
    • Replies: 8
    • Views: 807
    12-09-2016, 01:12 PM Go to last post
  53. Comment on ARIMA I do not understand.

    Although I have read a lot on ARIMA very little of it talks about the forecasting part of the process... I found this comment confusing. I thought...

    Started by noetsi‎, 12-09-2016 11:09 AM
    • Replies: 2
    • Views: 534
    12-09-2016, 01:10 PM Go to last post
  54. Smile Domestic and Crossborder M&A output Method

    Hi all, Currently I am struggling with getting the right method for the following research question: Do cross-border acquisitions lead to...

    Started by Wanttoknowit‎, 12-09-2016 07:53 AM
    m&a, methodology, panel data
    • Replies: 1
    • Views: 494
    12-09-2016, 10:07 AM Go to last post
  55. Calculating Standard Deviation for variable that has multiple distributions

    My organization is a certification agency. We ask a wide range of questions on a company's performance, which include Yes/No, multiple choice,...

    Started by santiagopm88‎, 12-08-2016 11:22 AM
    • Replies: 1
    • Views: 502
    12-08-2016, 11:40 AM Go to last post
  56. Can I use ANOV for testing how correlation coefficient varies in condition??

    Hi everyone, I have a problem with the statistical analysis of my data namely I want to look into how anatomical values correlate with some...

    Started by cecilia‎, 12-05-2016 06:54 AM
    anova, correlation, multiple comparison
    • Replies: 0
    • Views: 619
    12-05-2016, 06:54 AM Go to last post
  57. [SOLVED] Classification problem

    Hi, I just need a couple of pointers in the right direction. I have a water quality network of about 15 sites, of which we have three defined...

    Started by bugman‎, 12-05-2016 12:10 AM
    • Replies: 0
    • Views: 503
    12-05-2016, 12:10 AM Go to last post
  58. Regression with different subsamples of countries

    I am trying to run a firm-level regression and am a bit confused with the results so I'd appreciate any comments. So the data is at the firm-year...

    Started by siaaia88‎, 11-30-2016 04:47 PM
    • Replies: 2
    • Views: 708
    12-03-2016, 04:08 PM Go to last post
  59. Cluster with unknown number of sampling units?

    I work on survey data which are usually collected through muti-stage cluster sampling. I am used to seeing clusters as geographically defined groups...

    Started by alexirani‎, 11-30-2016 06:36 AM
    • Replies: 0
    • Views: 515
    11-30-2016, 06:36 AM Go to last post
  60. How to quantify accuracy of responses to a question by multiple participants?

    I am a medical doctor working on a small project and needed statistical advice. My statistical background is very basic. The project purpose is to...

    Started by randomuser‎, 11-27-2016 01:46 AM
    • Replies: 0
    • Views: 592
    11-27-2016, 01:46 AM Go to last post

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