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Forum: Applied Statistics

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

  1. Best Practice Time Series Analysis

    Hello, I have got a general question. Should trend models like y(t)= b(0)+ b(1)*t y(t)= b(0)+ b(1)*t+ b(2)* t^2 y(t)= b(0)* exp in case...

    Started by consuli‎, 03-15-2015 11:05 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 598
    Yesterday, 11:56 AM Go to last post
  2. Statistical model selection for analysis

    Dear Users, I have set of data for analyzing tennis players wins and loss in three different court surfaces like hard, clay and grass. I would like...

    Started by rajarajan‎, Yesterday 12:31 AM
    • Replies: 1
    • Views: 88
    Yesterday, 04:56 AM Go to last post
  3. missing data/multiple imputations

    They often talk about whether the mechanism that generates missing data is"ignorable." I don't really know what this means in practice. Also how do...

    Started by noetsi‎, 03-12-2015 01:40 PM
    • Replies: 12
    • Views: 300
    03-23-2015, 12:18 PM Go to last post
  4. 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: 23
    • Views: 99,914
    03-23-2015, 02:56 AM Go to last post
  5. ranking players based on win loss record

    I can see this is a very knowledgeable group. Sorry if this is simple/stupid. Hope someone won't mind helping. I did try searching first, but...

    Started by mpb1123‎, 03-21-2015 10:20 AM
    • Replies: 0
    • Views: 101
    03-21-2015, 10:20 AM Go to last post
  6. Question What measure of central tendency?

    Hi folks, I am currently working on an analysis of workflow duration (time elapsed between start of process A and start of process B in a...

    Started by Marc_lux‎, 03-12-2015 03:55 AM
    • Replies: 1
    • Views: 161
    03-21-2015, 04:14 AM Go to last post
  7. increasing the statistical significance of outliers

    Can someone give me some assistance on the use case below? Summary To create a Key Performance Indicator (as a percent of server utilization...

    Started by jedatt01‎, 03-19-2015 03:47 PM
    outliers, weighted average
    • Replies: 3
    • Views: 136
    03-20-2015, 02:55 AM Go to last post
  8. Valid AR and MA parameters for arima.sim()

    Hi, I did not do time series analysis for a while. The following code seems not to produce a stationary series. x <-arima.sim(n=n,...

    Started by consuli‎, 03-17-2015 02:32 PM
    • Replies: 2
    • Views: 146
    03-17-2015, 04:58 PM Go to last post
  9. Calculating a heat retention index for thermos bottles

    I have a couple of thermos bottles that I use for hot beverages at my desk. I like my drinks at about 135-145, so that's the range I am most...

    Started by Jennifer Murphy‎, 03-14-2015 01:09 AM
    • Replies: 0
    • Views: 142
    03-14-2015, 01:09 AM Go to last post
  10. Do i need equidistant time intervals for classification task?

    I have a dataset of the following structure and want to use it for a classification task. The first column contains the timestamp when the values...

    Started by JohnMeier‎, 03-10-2015 03:29 PM
    • Replies: 0
    • Views: 176
    03-10-2015, 03:29 PM Go to last post
  11. Can I multiply r quared with relative standard deviation

    Hello, I'm trying to compare results of my crop model against observations on crop production and am especially interested in how well the model...

    Started by Sider003‎, 03-07-2015 05:14 AM
    • Replies: 1
    • Views: 197
    03-09-2015, 10:40 AM Go to last post
  12. Probability highest value is not part of population

    Hi I've got a very simple problem but I don't know what test to use and I've been searching without success so I'd very much appreciate some help. ...

    Started by Haseler‎, 03-05-2015 03:54 PM
    highest, lowest., outlier, probability
    • Replies: 6
    • Views: 245
    03-06-2015, 08:33 AM Go to last post
  13. Time Series Hold out data not used in modeling?

    Hello everyone. It is my understanding that if one wants to built a time series model on data a time series that went from 2000 to today (2015)...

    Started by Anotherdream‎, 03-05-2015 02:09 PM
    • Replies: 2
    • Views: 113
    03-05-2015, 02:39 PM Go to last post
  14. Hey dason - unit root test

    Dason this is what I meant although I got the test wrong. "Stationarity tests have stationarity under the null hypothesis, thus reversing the null...

    Started by noetsi‎, 03-03-2015 10:39 AM
    • Replies: 3
    • Views: 202
    03-05-2015, 11:34 AM Go to last post
  15. Comparing two samples of volatility data: Some complications

    Hi guys, I'm having some problems establishing the best possible test for a comparison of two samples. Background: I'm investigating the...

    Started by AcuteApathy‎, 03-03-2015 05:02 AM
    comparisons, finance, volatility
    • Replies: 0
    • Views: 152
    03-03-2015, 05:02 AM Go to last post
  16. What does this author mean [time series]

    This comes from page 43 of "Practical Time Series Analysis Using SAS' It occurs in a section about confidence intervals. Part of my question is that...

    Started by noetsi‎, 03-02-2015 04:03 PM
    • Replies: 1
    • Views: 167
    03-02-2015, 04:28 PM Go to last post
  17. Response surface models using quantitative variables

    This relates to the mineral industry so a little context first. We are trying to estimate the uncertainty in the amount of ore that can be recovered...

    Started by pet_griffin‎, 03-02-2015 04:22 AM
    • Replies: 0
    • Views: 155
    03-02-2015, 04:22 AM Go to last post
  18. Density function of a skewed normal distribution

    Hello, for simulation purposes I want to construct a skewed normal distribution. How must I alter the density function d(z) of the (unskewed)...

    Started by consuli‎, 02-28-2015 05:41 AM
    • Replies: 4
    • Views: 274
    02-28-2015, 05:06 PM Go to last post
  19. Holt Winters assumptions (aka exponential smoothing).

    I have not found assumptions of the methods for this raised very often except for outliers. And I have seen that it is very robust to violations of...

    Started by noetsi‎, 02-27-2015 05:15 PM
    • Replies: 2
    • Views: 193
    02-27-2015, 06:14 PM Go to last post
  20. Applying Credible Intervals vs Confidence Intervals

    Hi all, Struggling through a problem at work, and we are slogging through an internal debate. We are not statisticians and rapidly finding the...

    Started by abgtr‎, 02-26-2015 01:24 AM
    • Replies: 0
    • Views: 142
    02-26-2015, 01:24 AM Go to last post
  21. Exclamation Aggregate Loss Model (Actuarial Science)

    Question: Let S be the random sum of N independent frequencies {{M_i}} where N is negative binomial distributed with r = 5 and \beta= 3 and {M_i}...

    Started by Asano‎, 02-25-2015 11:09 AM
    actuarial, aggregate, distribution, loss, science
    • Replies: 1
    • Views: 182
    02-25-2015, 01:31 PM Go to last post
  22. Basic Question: Time series at lower level forecasting?

    Hello everyone. I have what I think is a very basic question but I am greatly struggling with knowing what model to use and where to start, and all...

    Started by Anotherdream‎, 02-24-2015 09:24 PM
    • Replies: 0
    • Views: 146
    02-24-2015, 09:24 PM Go to last post
  23. Basic question- Predicting "the whole from a part"

    *********x

    Started by gregoryjgold‎, 02-24-2015 07:16 AM
    basic, predict, variance
    • Replies: 0
    • Views: 131
    02-24-2015, 07:16 AM Go to last post
  24. Statistical test for unbalance panel data

    I want to analyse the importance of an independent variable which is a dummy variable. The whole data is divided into two groups making both groups...

    Started by nidhibansal111‎, 02-23-2015 05:07 AM
    • Replies: 0
    • Views: 121
    02-23-2015, 05:07 AM Go to last post
  25. Help with Factor Analysis.

    Hello, I am trying to understand how to interpret The Rotation sum squared loading in the promax factor analysis. I am getting these 3 numbers on...

    Started by Angel‎, 02-19-2015 10:45 AM
    • Replies: 0
    • Views: 211
    02-19-2015, 10:45 AM Go to last post
  26. Decision tree to identify best strategy to model data

    I would like to have a decision tree to choose best way to model data, similar to this example for choosing best statistical test: Thanks ...

    Started by BernardoBello‎, 02-11-2015 10:35 AM
    methodology
    • Replies: 0
    • Views: 279
    02-11-2015, 10:35 AM Go to last post
  27. Which model to use for binomial target variable?

    Hello! which model is the best predictive statistical model for a binomial scaled target variable, when I want a binomial {0; 1} prediction (not...

    Started by consuli‎, 02-05-2015 03:27 AM
    • Replies: 5
    • Views: 434
    02-06-2015, 12:30 PM Go to last post
  28. Impact of change of units on test of statistical signficance.

    I think I understand the theory here, changing units does not matter for test of significance, but changing the concentration of effect does, but...

    Started by noetsi‎, 01-25-2015 02:55 PM
    • Replies: 2
    • Views: 347
    02-03-2015, 09:45 PM Go to last post
  29. Post Wilcoxon Signed- Rank Test vs Kruskal Wallis vs One Way Anova? Which one to use.

    Dear forum Professors, I am conducting a research to rank the importance of certain elements within a property management framework. Would like to...

    Started by LittleWar‎, 01-30-2015 05:25 AM
    ranks
    • Replies: 3
    • Views: 377
    01-31-2015, 04:55 AM Go to last post
  30. Cool Choosing a good descriptor: criteria and common practice

    Hello and thanks for reading this post. Here's my question, using an example: Let's say i have a lot of measurement data for a lot of people, and I...

    Started by JuliusT2‎, 01-28-2015 10:38 AM
    • Replies: 0
    • Views: 189
    01-28-2015, 10:38 AM Go to last post
  31. Test of discrete distributions

    There are test such as Anderson Darling if a distribution is normally distributed. At least in SAS these do not cover discrete distributions such as...

    Started by noetsi‎, 01-27-2015 01:59 PM
    qq-plot
    • Replies: 3
    • Views: 284
    01-28-2015, 08:45 AM Go to last post
  32. Compensating errors; normal distribution; subset; monte carlo simulation

    Hi all, Please forgive the slightly long winded explanation, I could really do with some help here. I have a computer simulation which contains...

    Started by kinsetsu‎, 01-28-2015 05:38 AM
    errors, monte carlo, normal distribution
    • Replies: 0
    • Views: 185
    01-28-2015, 05:38 AM Go to last post
  33. Predictive Statistical Modeling Guide

    Hi, what do you think about my little predictive statistical modeling guide?

    Started by consuli‎, 01-26-2015 02:08 PM
    • Replies: 0
    • Views: 221
    01-26-2015, 02:08 PM Go to last post
  34. Comparing two datasets - more sophisticated methods than just descriptive statistics?

    I have a question about methods used to compare variables in two datasets. I've been looking into publications on data quality, but I haven't been...

    Started by Kabouterke‎, 01-26-2015 07:54 AM
    • Replies: 4
    • Views: 262
    01-26-2015, 09:59 AM Go to last post
  35. Comparing between Likert scales (non parametric)

    Hi, We ran a small survey study (n=50) with questions on perceived value of een tool we've developed. The data is not normally distributed, and...

    Started by RDW‎, 01-22-2015 09:06 AM
    • Replies: 12
    • Views: 515
    01-23-2015, 08:26 AM Go to last post
  36. Multiple imputation

    I am trying to learn this with limited success so far. In the following I don't understand what observed and unobserved data is. Does anyone have any...

    Started by noetsi‎, 01-22-2015 09:05 AM
    • Replies: 9
    • Views: 319
    01-22-2015, 04:52 PM Go to last post
  37. Optimizing Burn-in Testing

    I'm new to the field and have a problem that I'm currently stuck on. For burn-in testing of a machine, we cycle test it 500 times. Sometimes it'll...

    Started by RelEng‎, 01-22-2015 02:01 PM
    burn-in, confidence, plot
    • Replies: 1
    • Views: 155
    01-22-2015, 02:24 PM Go to last post
  38. Multivariate test suggestions

    Hi, thanks for taking the time to read this. I hope I am posting this in the correct forum. I have soil chemistry data from 5 different areas,...

    Started by hgold‎, 01-15-2015 02:39 PM
    • Replies: 13
    • Views: 483
    01-21-2015, 11:27 AM Go to last post
  39. Does this test require a correction for the multiple comparisons problem

    Hi I am interested in testing the effect of changing contact methodology on customer churn rate. I have 4 product groups and am very interested in...

    Started by dasc‎, 01-21-2015 04:19 AM
    • Replies: 1
    • Views: 218
    01-21-2015, 06:49 AM Go to last post
  40. Using statistical methods with different sample sizes (software systems) - pls help!

    Hi, although I once upon a time did all the usual college courses in stats & probability I would consider myself fairly new to using statistical...

    Started by m23‎, 01-20-2015 03:12 PM
    • Replies: 0
    • Views: 188
    01-20-2015, 03:12 PM Go to last post
  41. Inventory modeling and safety stock calculation

    I'm trying to build a statistical model that will determine my company's safety stock level and reorder points for its various products. My...

    Started by jrobrien4‎, 01-15-2015 11:37 PM
    inventory modeling, safety stock
    • Replies: 1
    • Views: 268
    01-17-2015, 10:11 AM Go to last post
  42. Correlation and direction of effect

    I ran into an interesting research example today. Tranplats were assumed to be the predictor variable and death the dependent variable. High...

    Started by noetsi‎, 01-16-2015 02:39 PM
    • Replies: 2
    • Views: 145
    01-16-2015, 03:44 PM Go to last post
  43. European Social Survey -- income variable

    If you have worked with the ESS and are familiar with the vagaries of the income variable, perhaps you can help me identify a solution to a specific...

    Started by dbartram‎, 06-20-2013 10:45 AM
    2 Pages
    1 2
    ess
    • Replies: 15
    • Views: 2,446
    01-16-2015, 06:43 AM Go to last post
  44. Bayesian AB Testing - Minimum Sample Size

    I've used python to analyse data from AB tests using Bayesian analysis, and for all tests I assume no prior knowledge and so set alpha = beta = 1. ...

    Started by samg86‎, 01-15-2015 10:28 AM
    bayesian, power
    • Replies: 1
    • Views: 258
    01-15-2015, 10:52 AM Go to last post
  45. suggested reading

    Anyone know a good introductory work for Survival Analysis, Cox regression? As a silly aside I recently got a book recommended as introductory....

    Started by noetsi‎, 01-12-2015 01:39 PM
    • Replies: 6
    • Views: 561
    01-13-2015, 10:01 AM Go to last post
  46. Sequential pattern analysis

    Hi, For my research, I need to learn and use this kind of analysis. I'm looking for web sites, books, articles or other resources for...

    Started by Sam31‎, 01-11-2015 05:31 AM
    • Replies: 0
    • Views: 377
    01-11-2015, 05:31 AM Go to last post
  47. Sensitivity Analysis Resources

    I was wondering if any one had a good reference for Sensitivity Analysis. Some thing fairly simple. I typically use SAS, but any general reference...

    Started by hlsmith‎, 12-30-2014 01:39 PM
    sensitivity analysis
    • Replies: 5
    • Views: 387
    01-10-2015, 04:51 AM Go to last post
  48. mean and variance of lognormal distributed random variable.

    This is really basic, but the wording confuses me badly obviously. That sounds like they are saying, and I have found similar wording in many...

    Started by noetsi‎, 01-09-2015 04:35 PM
    • Replies: 8
    • Views: 357
    01-09-2015, 06:06 PM Go to last post
  49. Simulations

    I mean this to be a general thread on simulation but will start with a specific point. The following I know is a trivial example, CI are well...

    Started by noetsi‎, 01-05-2015 01:10 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 903
    01-09-2015, 02:36 PM Go to last post
  50. Helping a statistics newbie for phonetics research

    Hello, For a phonetics course we are doing some research and despite my limited knowledge of statistics, I have been burdened with the task of...

    Started by Pedaalemmerzak‎, 12-26-2014 07:36 AM
    • Replies: 2
    • Views: 397
    01-06-2015, 09:06 AM Go to last post
  51. What statistical method to use?

    I would like to test some hypotheses using the following model Y(j,t) = α+ β1X1(j,t)+ β2X2(j,t) +β3X3(j,t)+ β4X4(j,t)+ β5X5(j,t)+ β6X6(j,t)+...

    Started by zina‎, 01-05-2015 04:55 PM
    • Replies: 12
    • Views: 448
    01-05-2015, 05:50 PM Go to last post
  52. Reasoning behind comparing variance between and within for Anova?

    I looking for some logic reasoning behind why ANOVA test uses σ2 given by these to variables. Why??

    Started by 216‎, 01-02-2015 04:16 PM
    • Replies: 1
    • Views: 422
    01-03-2015, 11:01 AM Go to last post
  53. Performance Improvement

    I apologize if this is the wrong place, or not even applicable (please remove if so). However this was my last attempt to try and figure out this...

    Started by ndsarantis‎, 12-29-2014 03:21 PM
    • Replies: 7
    • Views: 446
    01-02-2015, 10:44 PM Go to last post
  54. Cool Calculating End-of-year performance for IRA when base changes during the year.

    Hi Everyone, One the surface, this would seem to be an extremely simple calculation... but it has me stumped. To demonstrate, I'll give you two...

    Started by Dorftrottel‎, 01-01-2015 10:49 PM
    • Replies: 0
    • Views: 264
    01-01-2015, 10:49 PM Go to last post
  55. Fit statistics - why is this so

    I was/am reading an econometric book commenting on R squared specifically, but fit statistics more generally. The author makes the following comment...

    Started by noetsi‎, 12-29-2014 04:05 PM
    • Replies: 2
    • Views: 343
    12-30-2014, 08:08 AM Go to last post
  56. Combining performance metrics

    Hi All and Merry Christmas to those that are celebrating. I have a querie about how to combine different metrics relating to performace of a...

    Started by extant‎, 12-24-2014 09:24 PM
    • Replies: 5
    • Views: 571
    12-28-2014, 03:50 AM Go to last post
  57. Which statistical test? Interobserver variation

    Dear all! I am trying to compare the ability of experienced pathologist and residents in scoring percentage of cancer timor cells in some images of...

    Started by lufthoved‎, 12-27-2014 04:34 PM
    • Replies: 4
    • Views: 508
    12-28-2014, 02:07 AM Go to last post
  58. Football Injury Stats

    So I came across this article about English Premier League football clubs and injuries. A data analyst has "clearly demonstrate(d) that Arsenal do...

    Started by Prometheus‎, 12-23-2014 06:00 PM
    • Replies: 6
    • Views: 428
    12-26-2014, 03:23 PM Go to last post
  59. Missort Letter Sorting Machine (Statistical Approach)

    Hi all, I'm doing some test in a LETTER SORTING MACHINE and I have to prove that with the new modifications to the machine we get a MISSORT...

    Started by ico‎, 12-19-2014 02:57 AM
    • Replies: 4
    • Views: 515
    12-22-2014, 10:40 AM Go to last post
  60. stdev hourly average --> stdev individual measurements

    For a process variable that's measured every 2 minutes, there's a requirement that the hourly averages of this variable should lie within a normal...

    Started by damionka‎, 12-19-2014 08:36 AM
    • Replies: 0
    • Views: 278
    12-19-2014, 08:36 AM Go to last post

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