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Forum: Applied Statistics

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

  1. 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 09:53 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 168,594
    Yesterday, 10:18 AM Go to last post
  2. 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: 611
    02-22-2017, 03:15 PM Go to last post
  3. 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: 60
    02-22-2017, 02:46 PM Go to last post
  4. 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: 85
    02-21-2017, 09:02 PM Go to last post
  5. 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: 163
    02-19-2017, 04:10 PM Go to last post
  6. [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: 234
    02-17-2017, 05:07 PM Go to last post
  7. 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: 724
    02-02-2017, 11:34 AM Go to last post
  8. 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: 356
    02-01-2017, 03:15 AM Go to last post
  9. 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: 137
    01-30-2017, 05:11 AM Go to last post
  10. 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: 546
    01-27-2017, 03:46 PM Go to last post
  11. 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: 164
    01-27-2017, 07:16 AM Go to last post
  12. 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: 175
    01-24-2017, 06:05 AM Go to last post
  13. 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: 230
    01-21-2017, 07:10 PM Go to last post
  14. 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: 231
    01-19-2017, 05:11 PM Go to last post
  15. 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: 313
    01-18-2017, 10:50 PM Go to last post
  16. 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: 169
    01-18-2017, 11:23 AM Go to last post
  17. 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: 282
    01-18-2017, 03:22 AM Go to last post
  18. 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: 369
    01-16-2017, 03:29 AM Go to last post
  19. 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: 276
    01-15-2017, 12:27 PM Go to last post
  20. 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: 415
    01-10-2017, 01:43 PM Go to last post
  21. 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: 257
    01-09-2017, 05:17 PM Go to last post
  22. 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: 274
    01-08-2017, 06:21 AM Go to last post
  23. 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: 236
    01-08-2017, 05:06 AM Go to last post
  24. 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: 387
    01-06-2017, 04:21 AM Go to last post
  25. 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: 259
    01-06-2017, 12:45 AM Go to last post
  26. 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: 994
    01-04-2017, 01:15 AM Go to last post
  27. 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: 270
    01-03-2017, 08:27 PM Go to last post
  28. 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: 352
    12-31-2016, 09:33 AM Go to last post
  29. 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: 522
    12-27-2016, 12:50 AM Go to last post
  30. 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: 355
    12-24-2016, 11:27 PM Go to last post
  31. 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: 623
    12-20-2016, 05:08 PM Go to last post
  32. 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: 354
    12-15-2016, 05:02 PM Go to last post
  33. 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: 480
    12-15-2016, 04:52 PM Go to last post
  34. 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: 557
    12-09-2016, 04:09 PM Go to last post
  35. 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: 547
    12-09-2016, 02:12 PM Go to last post
  36. 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: 311
    12-09-2016, 02:10 PM Go to last post
  37. 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: 290
    12-09-2016, 11:07 AM Go to last post
  38. 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: 313
    12-08-2016, 12:40 PM Go to last post
  39. 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: 371
    12-05-2016, 07:54 AM Go to last post
  40. [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: 295
    12-05-2016, 01:10 AM Go to last post
  41. 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: 437
    12-03-2016, 05:08 PM Go to last post
  42. 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: 314
    11-30-2016, 07:36 AM Go to last post
  43. 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: 367
    11-27-2016, 02:46 AM Go to last post
  44. 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: 400
    11-24-2016, 03:14 PM Go to last post
  45. 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: 482
    11-23-2016, 02:01 AM Go to last post
  46. 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: 466
    11-18-2016, 10:58 PM Go to last post
  47. 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: 370
    11-18-2016, 03:17 PM Go to last post
  48. 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: 314
    11-18-2016, 11:42 AM Go to last post
  49. 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: 501
    11-16-2016, 10:14 AM Go to last post
  50. 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: 391
    11-15-2016, 02:12 AM Go to last post
  51. 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: 675
    11-01-2016, 05:48 PM Go to last post
  52. 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: 716
    10-28-2016, 06:47 AM Go to last post
  53. 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: 399
    10-27-2016, 04:13 AM Go to last post
  54. 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: 441
    10-22-2016, 06:38 AM Go to last post
  55. 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: 386
    10-21-2016, 08:57 PM Go to last post
  56. 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: 507
    10-21-2016, 08:55 PM Go to last post
  57. 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: 477
    10-17-2016, 05:08 PM Go to last post
  58. 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: 424
    10-16-2016, 03:43 AM Go to last post
  59. 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: 468
    10-16-2016, 12:26 AM Go to last post
  60. 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: 457
    10-15-2016, 09:38 PM Go to last post

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