1. 10-14-2010
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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: 41
    • Views: 1,642
    Yesterday, 02:35 PM Go to last post
  2. 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, Yesterday 10:57 AM
    decrements, estimation
    • Replies: 0
    • Views: 49
    Yesterday, 10:57 AM Go to last post
  3. 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: 177
    03-27-2017, 11:27 AM Go to last post
  4. 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
    • Replies: 11
    • Views: 291
    03-26-2017, 11:32 AM Go to last post
  5. 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: 242
    03-22-2017, 06:09 PM Go to last post
  6. 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: 268
    03-22-2017, 02:11 PM Go to last post
  7. 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: 88
    03-20-2017, 05:51 AM Go to last post
  8. 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: 224
    03-18-2017, 03:50 AM Go to last post
  9. 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: 131
    03-17-2017, 05:03 PM Go to last post
  10. 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: 186
    03-11-2017, 05:00 AM Go to last post
  11. 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: 242
    03-08-2017, 10:06 AM Go to last post
  12. 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: 135
    03-07-2017, 09:42 AM Go to last post
  13. 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: 244
    03-04-2017, 01:14 PM Go to last post
  14. 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: 140
    03-03-2017, 08:36 AM Go to last post
  15. 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: 198
    03-02-2017, 12:35 PM Go to last post
  16. 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: 368
    03-01-2017, 10:18 AM Go to last post
  17. 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: 288
    03-01-2017, 08:18 AM Go to last post
  18. 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: 338
    02-26-2017, 09:35 AM Go to last post
  19. 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: 172,986
    02-23-2017, 09:18 AM Go to last post
  20. 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: 1,171
    02-22-2017, 02:15 PM Go to last post
  21. 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: 213
    02-22-2017, 01:46 PM Go to last post
  22. 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: 259
    02-21-2017, 08:02 PM Go to last post
  23. 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: 350
    02-19-2017, 03:10 PM Go to last post
  24. [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: 518
    02-17-2017, 04:07 PM Go to last post
  25. 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: 1,125
    02-02-2017, 10:34 AM Go to last post
  26. 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: 600
    02-01-2017, 02:15 AM Go to last post
  27. 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: 302
    01-30-2017, 04:11 AM Go to last post
  28. 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: 856
    01-27-2017, 02:46 PM Go to last post
  29. 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: 370
    01-27-2017, 06:16 AM Go to last post
  30. 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: 348
    01-24-2017, 05:05 AM Go to last post
  31. 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: 474
    01-21-2017, 06:10 PM Go to last post
  32. 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: 451
    01-19-2017, 04:11 PM Go to last post
  33. 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: 545
    01-18-2017, 09:50 PM Go to last post
  34. 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: 411
    01-18-2017, 10:23 AM Go to last post
  35. 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: 534
    01-18-2017, 02:22 AM Go to last post
  36. 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: 712
    01-16-2017, 02:29 AM Go to last post
  37. 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: 516
    01-15-2017, 11:27 AM Go to last post
  38. 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: 688
    01-10-2017, 12:43 PM Go to last post
  39. 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: 529
    01-09-2017, 04:17 PM Go to last post
  40. 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: 595
    01-08-2017, 05:21 AM Go to last post
  41. 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: 510
    01-08-2017, 04:06 AM Go to last post
  42. 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: 670
    01-06-2017, 03:21 AM Go to last post
  43. 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: 555
    01-05-2017, 11:45 PM Go to last post
  44. 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: 1,431
    01-04-2017, 12:15 AM Go to last post
  45. 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: 540
    01-03-2017, 07:27 PM Go to last post
  46. 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: 604
    12-31-2016, 08:33 AM Go to last post
  47. 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: 864
    12-26-2016, 11:50 PM Go to last post
  48. 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: 595
    12-24-2016, 10:27 PM Go to last post
  49. 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: 987
    12-20-2016, 04:08 PM Go to last post
  50. 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: 641
    12-15-2016, 04:02 PM Go to last post
  51. 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: 799
    12-15-2016, 03:52 PM Go to last post
  52. 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: 892
    12-09-2016, 03:09 PM Go to last post
  53. 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: 888
    12-09-2016, 01:12 PM Go to last post
  54. 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: 607
    12-09-2016, 01:10 PM Go to last post
  55. 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: 557
    12-09-2016, 10:07 AM Go to last post
  56. 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: 561
    12-08-2016, 11:40 AM Go to last post
  57. 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: 669
    12-05-2016, 06:54 AM Go to last post
  58. [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: 576
    12-05-2016, 12:10 AM Go to last post
  59. 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: 828
    12-03-2016, 04:08 PM Go to last post
  60. 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: 585
    11-30-2016, 06:36 AM Go to last post

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