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Forum: Applied Statistics

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

  1. 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: 2
    • Views: 142
    Today, 04:01 PM Go to last post
  2. 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: 90
    01-21-2017, 07:10 PM Go to last post
  3. 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: 107
    01-19-2017, 05:11 PM Go to last post
  4. 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: 180
    01-18-2017, 10:50 PM Go to last post
  5. 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: 9
    • Views: 254
    01-18-2017, 12:13 PM Go to last post
  6. 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: 60
    01-18-2017, 11:23 AM Go to last post
  7. 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: 143
    01-18-2017, 03:22 AM Go to last post
  8. 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: 242
    01-16-2017, 03:29 AM Go to last post
  9. 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: 160
    01-15-2017, 12:27 PM Go to last post
  10. 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: 291
    01-10-2017, 01:43 PM Go to last post
  11. 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: 151
    01-09-2017, 05:17 PM Go to last post
  12. 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: 161
    01-08-2017, 06:21 AM Go to last post
  13. 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: 120
    01-08-2017, 05:06 AM Go to last post
  14. 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: 273
    01-06-2017, 04:21 AM Go to last post
  15. 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: 140
    01-06-2017, 12:45 AM Go to last post
  16. 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: 775
    01-04-2017, 01:15 AM Go to last post
  17. 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: 164
    01-03-2017, 08:27 PM Go to last post
  18. 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: 215
    12-31-2016, 09:33 AM Go to last post
  19. 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: 367
    12-27-2016, 12:50 AM Go to last post
  20. 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: 200
    12-24-2016, 11:27 PM Go to last post
  21. 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 11:44 AM
    • Replies: 10
    • Views: 443
    12-20-2016, 05:08 PM Go to last post
  22. 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 07:16 PM
    granger casuality, time series analysis
    • Replies: 1
    • Views: 221
    12-15-2016, 05:02 PM Go to last post
  23. 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 12:56 PM
    • Replies: 6
    • Views: 338
    12-15-2016, 04:52 PM Go to last post
  24. 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 05:58 PM
    • Replies: 2
    • Views: 394
    12-09-2016, 04:09 PM Go to last post
  25. 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 04:54 PM
    • Replies: 8
    • Views: 377
    12-09-2016, 02:12 PM Go to last post
  26. 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 12:09 PM
    • Replies: 2
    • Views: 187
    12-09-2016, 02:10 PM Go to last post
  27. 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 08:53 AM
    m&a, methodology, panel data
    • Replies: 1
    • Views: 160
    12-09-2016, 11:07 AM Go to last post
  28. 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 12:22 PM
    • Replies: 1
    • Views: 192
    12-08-2016, 12:40 PM Go to last post
  29. 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 07:54 AM
    anova, correlation, multiple comparison
    • Replies: 0
    • Views: 233
    12-05-2016, 07:54 AM Go to last post
  30. [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 01:10 AM
    • Replies: 0
    • Views: 173
    12-05-2016, 01:10 AM Go to last post
  31. 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 05:47 PM
    • Replies: 2
    • Views: 302
    12-03-2016, 05:08 PM Go to last post
  32. 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 07:36 AM
    • Replies: 0
    • Views: 195
    11-30-2016, 07:36 AM Go to last post
  33. 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 02:46 AM
    • Replies: 0
    • Views: 251
    11-27-2016, 02:46 AM Go to last post
  34. Post [Financial Statistics] Having prob to answering question for forward price with bonds

    Consider a long forward contract on a 5 year bond which is currently traded at a price RM900.00. The delivery price is RM910.00, the time to...

    Started by Michael95‎, 11-24-2016 03:14 PM
    • Replies: 0
    • Views: 267
    11-24-2016, 03:14 PM Go to last post
  35. Interpreting interaction terms

    Hi, I did an experiment with three different treatment groups. In addition to finding out whether the treatments were statistically significant, I...

    Started by Wendero‎, 11-20-2016 03:21 PM
    • Replies: 3
    • Views: 348
    11-23-2016, 02:01 AM Go to last post
  36. Time series thread

    Once more I try to understand things that I have failed to understand for nearly a decade... :p I am trying to analyze data where an X occurs now...

    Started by noetsi‎, 11-18-2016 01:20 PM
    • Replies: 4
    • Views: 315
    11-18-2016, 10:58 PM Go to last post
  37. What do you do when you are not sure...

    I often get asked to run things where some assumption is violated . Or a Y variable has 9 distinct levels, so neither linear nor logistic regression...

    Started by noetsi‎, 11-18-2016 01:48 PM
    • Replies: 2
    • Views: 220
    11-18-2016, 03:17 PM Go to last post
  38. ARDL and Multilevel books

    I need a good book on autoregressive distributed lag (ARDL) and separately on multilevel regression. Ideally ones with some comments on how to run it...

    Started by noetsi‎, 11-18-2016 11:42 AM
    • Replies: 0
    • Views: 187
    11-18-2016, 11:42 AM Go to last post
  39. ADL-model with 0 lags

    Hello. We are doing a study with the Autoregressive Distrubuted Lag Model in Stata. Is it possible to get a model with 0 lags(ADL(0,0))? That is,...

    Started by DeltaY‎, 11-16-2016 04:48 AM
    • Replies: 1
    • Views: 355
    11-16-2016, 10:14 AM Go to last post
  40. Unhappy Simulating random samples that follow a particular distribution

    Hi, I am making a software that simulates evolution in a large population of fish and need help adding randomness to the process. Basically, in...

    Started by sosryet‎, 11-14-2016 07:04 PM
    • Replies: 1
    • Views: 269
    11-15-2016, 02:12 AM Go to last post
  41. Deciding by RMSE how many simulation results to use for a representative sample

    So, I'm doing a brute force Monte Carlo simulation to vary certain parameters and running a model through a thermal computational test bed. At the...

    Started by pythonprogrammer‎, 11-01-2016 05:48 PM
    representative, rms, rmse
    • Replies: 0
    • Views: 514
    11-01-2016, 05:48 PM Go to last post
  42. Question t test and data transformation

    Hi all, I hope this is the right place to post this question. We have two sets of data and we want to compare them. Both sets fail for normality...

    Started by mgubellini‎, 10-26-2016 04:20 AM
    • Replies: 9
    • Views: 565
    10-28-2016, 06:47 AM Go to last post
  43. Sampling Plan

    Hi everybody, this is Gias and this is my first post, I really hope you can help. Here's my question. In the company I work for, people carry...

    Started by Gias‎, 10-27-2016 04:13 AM
    sampling plan
    • Replies: 0
    • Views: 284
    10-27-2016, 04:13 AM Go to last post
  44. URL traffic

    Hi! I'm doing an piece of work which I need a bit of perspective on. I have been given two datasets; one containing 33,000'ish URLs and their...

    Started by alphonse2016‎, 10-22-2016 06:38 AM
    • Replies: 0
    • Views: 326
    10-22-2016, 06:38 AM Go to last post
  45. Loan equivalent to betting loses.

    A bet has a large probability p of winning small amounts of money M, and a low probability (1-p) of losing a large amount L>M .p/(p-1) So, the...

    Started by nuwopagog‎, 10-19-2016 08:39 PM
    • Replies: 1
    • Views: 262
    10-21-2016, 08:57 PM Go to last post
  46. Maximizing the probability of a user subsgribing given a price

    So, I was assigned the task outlined below and I have no idea on how to start. I'm a beginner so bear with me. We have a distribution that...

    Started by tophtop‎, 10-20-2016 08:57 AM
    • Replies: 1
    • Views: 393
    10-21-2016, 08:55 PM Go to last post
  47. Survey Assistance - how many top choices to pick

    In a survey of a closed, small and defined population (i.e. small business company), each is asked to choose the top x number from a list of 12...

    Started by Jane M‎, 10-17-2016 03:00 PM
    • Replies: 3
    • Views: 361
    10-17-2016, 05:08 PM Go to last post
  48. Measuring change over time- How to make measures from two datasets comparable?

    Greetings!!! I'm interested in learning how students' academic skills change overtime, to what extent, and how college contributes to this. ...

    Started by ricardo.l‎, 10-15-2016 09:44 PM
    data manipulation, longitudinal analysis, measuring time
    • Replies: 1
    • Views: 308
    10-16-2016, 03:43 AM Go to last post
  49. Test if a Trend is statistically Significant

    Hello, I am working with hospital data arranged in panel format over 4 years, something like this: ...

    Started by Laide‎, 10-11-2016 10:31 AM
    • Replies: 1
    • Views: 314
    10-16-2016, 12:26 AM Go to last post
  50. Unhappy Z Test with unknown sample size

    How would I conduct a z test when I don't have "n"? The instructor never went over what to do without an "n". It has always been provided. Please...

    Started by Psycmajor17‎, 10-12-2016 10:34 PM
    hypothesis testing, z-score, z-test
    • Replies: 2
    • Views: 338
    10-15-2016, 09:38 PM Go to last post
  51. F test for different Weigthed Least Squares adjustemnts

    Hello, I'like to check if variances from to differentes WLS adjustments arise from same population. Or maybe taken as equivalent. I use the F test...

    Started by tictac‎, 10-12-2016 01:29 PM
    • Replies: 1
    • Views: 271
    10-12-2016, 02:11 PM Go to last post
  52. Variance / Anova Questions

    I have readings taken at 20 different positions for 3 different treatments ( x 3 reps). The mean for each treatment is different. I am not interested...

    Started by confused slug‎, 10-12-2016 01:47 PM
    anova, variance
    • Replies: 0
    • Views: 243
    10-12-2016, 01:47 PM Go to last post
  53. Non-Linear programming :)

    Hi everyone So I am currently working on a non-linear model for my third year stats course & I need some help. I want to create a linking...

    Started by Juliana‎, 10-11-2016 06:16 AM
    constraints, non-linear program
    • Replies: 0
    • Views: 249
    10-11-2016, 06:16 AM Go to last post
  54. Missing data in regression

    I have an entire population. One of the variable is missing about 12 percent of the data. I believe this is because we have no finished collecting...

    Started by noetsi‎, 09-27-2016 03:55 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 1,128
    10-05-2016, 09:57 AM Go to last post
  55. mathematical model to build a ranking/ scoring system

    I want to rank a set of sellers. Each seller is defined by parameters var1,var2,var3,var4...var20. I want to score each of the sellers. Currently...

    Started by vij‎, 01-06-2016 04:36 AM
    applied statistics, machine learning, mathematical statistics, ranking
    • Replies: 1
    • Views: 613
    10-04-2016, 03:43 PM Go to last post
  56. Catastrohpe modeling and GLM

    Has anyone used Catastrophe (CAT) modeling results as a response variable in the GLM ? (1) Is this theoretically correct ? In the layman's terms,...

    Started by Choon‎, 10-03-2016 11:36 AM
    • Replies: 0
    • Views: 275
    10-03-2016, 11:36 AM Go to last post
  57. Question Concordance per juror in listening tests

    Hello, For the purpose of a university project I performed listening tests on a group of 10 jurors. They were evaluating the sounds with an A-B...

    Started by Amro‎, 09-29-2016 05:12 AM
    concordance
    • Replies: 0
    • Views: 241
    09-29-2016, 05:12 AM Go to last post
  58. Exclamation Causality test

    Do you know what is the "Hafner and Herwartz" causality-in-variance test, or else called LM-GARCH? And how you run it on eviews (or gretl)? If...

    Started by jamesb‎, 09-23-2016 03:32 PM
    causality, garch, granger, variance testing
    • Replies: 0
    • Views: 434
    09-23-2016, 03:32 PM Go to last post
  59. Question Engineering research tests: comparing post hoc data and paring

    Hello - I have several tests to do but my stats is a bit rusty... They are all based on the deflection of different beam designs: Test 1 Beam...

    Started by jarvis‎, 09-21-2016 12:18 PM
    anova, engineering, post-hoc, practical, research
    • Replies: 0
    • Views: 302
    09-21-2016, 12:18 PM Go to last post
  60. Help with non parametric analysis

    Hi, I'm about to write my master thesis and have some issues with analyzing my data. I have plants with different treatments and their...

    Started by dummy22‎, 09-10-2016 09:36 AM
    • Replies: 1
    • Views: 522
    09-10-2016, 11:58 AM Go to last post

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