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Forum: Applied Statistics

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

  1. 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 10:06 AM
    • Replies: 12
    • Views: 239
    01-23-2015, 09:26 AM Go to last post
  2. 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 10:05 AM
    • Replies: 9
    • Views: 167
    01-22-2015, 05:52 PM Go to last post
  3. 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 03:01 PM
    burn-in, confidence, plot
    • Replies: 1
    • Views: 65
    01-22-2015, 03:24 PM Go to last post
  4. 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 03:39 PM
    • Replies: 13
    • Views: 323
    01-21-2015, 12:27 PM Go to last post
  5. 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 05:19 AM
    • Replies: 1
    • Views: 107
    01-21-2015, 07:49 AM Go to last post
  6. 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 04:12 PM
    • Replies: 0
    • Views: 87
    01-20-2015, 04:12 PM Go to last post
  7. 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, 01-16-2015 12:37 AM
    inventory modeling, safety stock
    • Replies: 1
    • Views: 163
    01-17-2015, 11:11 AM Go to last post
  8. 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 03:39 PM
    • Replies: 2
    • Views: 60
    01-16-2015, 04:44 PM Go to last post
  9. 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 11:45 AM
    2 Pages
    1 2
    ess
    • Replies: 15
    • Views: 2,154
    01-16-2015, 07:43 AM Go to last post
  10. 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 11:28 AM
    bayesian, power
    • Replies: 1
    • Views: 117
    01-15-2015, 11:52 AM Go to last post
  11. 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 02:39 PM
    • Replies: 6
    • Views: 209
    01-13-2015, 11:01 AM Go to last post
  12. 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: 22
    • Views: 94,170
    01-12-2015, 10:35 AM Go to last post
  13. 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 06:31 AM
    • Replies: 0
    • Views: 131
    01-11-2015, 06:31 AM Go to last post
  14. 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 02:39 PM
    sensitivity analysis
    • Replies: 5
    • Views: 251
    01-10-2015, 05:51 AM Go to last post
  15. 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 05:35 PM
    • Replies: 8
    • Views: 207
    01-09-2015, 07:06 PM Go to last post
  16. 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 02:10 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 622
    01-09-2015, 03:36 PM Go to last post
  17. 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 08:36 AM
    • Replies: 2
    • Views: 283
    01-06-2015, 10:06 AM Go to last post
  18. 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 05:55 PM
    • Replies: 12
    • Views: 278
    01-05-2015, 06:50 PM Go to last post
  19. 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 05:16 PM
    • Replies: 1
    • Views: 308
    01-03-2015, 12:01 PM Go to last post
  20. 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 04:21 PM
    • Replies: 7
    • Views: 293
    01-02-2015, 11:44 PM Go to last post
  21. 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 11:49 PM
    • Replies: 0
    • Views: 168
    01-01-2015, 11:49 PM Go to last post
  22. 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 05:05 PM
    • Replies: 2
    • Views: 246
    12-30-2014, 09:08 AM Go to last post
  23. 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 10:24 PM
    • Replies: 5
    • Views: 397
    12-28-2014, 04:50 AM Go to last post
  24. 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 05:34 PM
    • Replies: 4
    • Views: 408
    12-28-2014, 03:07 AM Go to last post
  25. 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 07:00 PM
    • Replies: 6
    • Views: 304
    12-26-2014, 04:23 PM Go to last post
  26. 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 03:57 AM
    • Replies: 4
    • Views: 372
    12-22-2014, 11:40 AM Go to last post
  27. 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 09:36 AM
    • Replies: 0
    • Views: 179
    12-19-2014, 09:36 AM Go to last post
  28. Simulation

    I am slowly learning how to do this. In case the sources are useful to others - and that will likely mean only beginners at this, I figured I would...

    Started by noetsi‎, 12-16-2014 04:33 PM
    • Replies: 9
    • Views: 351
    12-17-2014, 12:46 PM Go to last post
  29. Interval censored time-to-event datasets?

    Hi everyone, I'm looking for this particular structure of data for working on my thesis. In particular, I need interval censored with a cure...

    Started by JBrettas‎, 12-11-2014 03:33 PM
    • Replies: 0
    • Views: 306
    12-11-2014, 03:33 PM Go to last post
  30. Best Method for Evaluating Inter-Instrument Agreement

    I am comparing two populations of color measuring instruments. 40 samples are measured on three instruments from both populations. What is the best...

    Started by krbutts65nc‎, 12-10-2014 03:36 PM
    • Replies: 2
    • Views: 272
    12-11-2014, 10:15 AM Go to last post
  31. Two-way ANOVA and subsequent posthoc testing

    Hi all, First of all I'm new to this forum so I hope I'm posting in the right section (please forgive me if it's not the case :)). I'm a PhD...

    Started by quentin.flm‎, 12-10-2014 07:17 AM
    • Replies: 4
    • Views: 245
    12-11-2014, 08:33 AM Go to last post
  32. Correct Procedure for analysis of Drivers

    Hello, I have some survey data which shows an effort score for interacting with a business. I am working in a programme of work tasked to reduce...

    Started by Silvertreetops‎, 12-11-2014 02:37 AM
    drivers, factor analysis, principal component, principal components, survey
    • Replies: 0
    • Views: 135
    12-11-2014, 02:37 AM Go to last post
  33. Monte Carlo simulation of Mixed Logit

    Hello I have estimated a random coefficient logit with heteroscedasticity modelling respondents choice of mobile phones. The heteroscedasticity...

    Started by JesperHP‎, 12-10-2014 11:55 PM
    • Replies: 0
    • Views: 161
    12-10-2014, 11:55 PM Go to last post
  34. Calculating sample size required for a certain confidence interval

    If I have two different independent variables x1 and x2 for which I have a model that predicts these two quantities have means mu1 and mu2, how can I...

    Started by s0medave‎, 12-10-2014 10:55 AM
    students t-test
    • Replies: 1
    • Views: 173
    12-10-2014, 11:35 AM Go to last post
  35. Optimal statistical method to optimize a model based on 35 variables

    Good day, I try to build a model behind a dating website which gives an optimal match between two people, based on 35 variables such as: age...

    Started by Marcel502‎, 12-08-2014 09:43 AM
    • Replies: 4
    • Views: 289
    12-09-2014, 10:22 AM Go to last post
  36. Theoretical Question Operational Data What is Sample and what is population.

    Hi all. I'm working on operational data of clinical operations, attendance, performance and employee performance. I'm trying to use...

    Started by Dan TheMan‎, 12-08-2014 04:25 AM
    population, sample, sample mean and variance
    • Replies: 0
    • Views: 178
    12-08-2014, 04:25 AM Go to last post
  37. Analysis for determining change in temperature

    Hi, I've got a process where a temperature reaches its final (unknown) value in about 120 min. What statistical analysis should I carry out on my...

    Started by Brettan‎, 12-01-2014 09:01 AM
    bio-equivalence
    • Replies: 6
    • Views: 434
    12-05-2014, 01:36 AM Go to last post
  38. Using ANOVA for fingerprint comparison data

    Hi, I'm a fingerprint examiner by trade and got an idea after reading some papers on various quantitative methods of determining consensus and...

    Started by boyd_lpe‎, 11-24-2014 11:46 AM
    • Replies: 2
    • Views: 295
    12-04-2014, 04:36 PM Go to last post
  39. Coefficient of Variation with Log Transformed Data

    I know that when working with log transformed data, coefficient of variation (CV) on original scale is equal to sqrt(exp(sigma^2) - 1), where sigma...

    Started by George Firmstone‎, 12-04-2014 02:15 PM
    • Replies: 1
    • Views: 193
    12-04-2014, 04:02 PM Go to last post
  40. Regress Var1POST controlling for var1PRE- Valid approach?

    Hello guys, I have a variable that assesses medication adherence among participants with HIV. This variable has ordinal values (likert scale 1 to...

    Started by Marvin85‎, 12-02-2014 04:36 PM
    pre vs post, regress
    • Replies: 2
    • Views: 229
    12-03-2014, 11:53 AM Go to last post
  41. Arithmetic/Log returns of positive/negative/0 values

    I'm trying to work out the correlation between movements in prices of 2 products i'm tracking. I will extend this to around 20 products but just want...

    Started by awright‎, 11-25-2014 01:40 PM
    arithmetic return, correlation, log return, negative number, zero number
    • Replies: 0
    • Views: 293
    11-25-2014, 01:40 PM Go to last post
  42. Family wise error regression models

    I commonly run multiple regressions from the same data set (which seems to occur elsewhere as well given articles I have seen). Formally I think this...

    Started by noetsi‎, 11-24-2014 12:43 PM
    • Replies: 5
    • Views: 282
    11-24-2014, 05:01 PM Go to last post
  43. Clustering in a game simulation

    Im looking at computer-assisted opening leads in the card game of bridge. I think this needs some kind of statistical clustering, and this is what...

    Started by shein‎, 11-24-2014 03:20 AM
    • Replies: 0
    • Views: 161
    11-24-2014, 03:20 AM Go to last post
  44. test of proportion

    Even for me this is a basic question, but I am having a crisis of confidence about my knowledge of stats these days.... I am testing if there is a...

    Started by noetsi‎, 11-14-2014 05:02 PM
    • Replies: 14
    • Views: 630
    11-21-2014, 01:05 PM Go to last post
  45. Predicting the near-future values using an unevenly sampled time-series data

    Hi there, I need help with predicting the near-future values using an unevenly sampled time-series data. Data is collected as events, and is...

    Started by kirty‎, 11-18-2014 06:11 PM
    neural networks, prediction, svm, time series
    • Replies: 1
    • Views: 410
    11-19-2014, 08:01 AM Go to last post
  46. Forecasting with a known limit

    Hi all, I've been asked to forecast usage of a system where the quantity of usage per average user gradually increases, and the number of users...

    Started by L4stat‎, 11-19-2014 05:02 AM
    • Replies: 1
    • Views: 216
    11-19-2014, 07:45 AM Go to last post
  47. Comparing samples to populatins

    This might actually wonder into the theory GretaGarbo loves and I dread... For the past month I have, with great pain, been comparing our...

    Started by noetsi‎, 11-18-2014 05:08 PM
    • Replies: 2
    • Views: 204
    11-18-2014, 05:45 PM Go to last post
  48. Customer Segmentation based on Annual Spend for the purpose of B2B Pricing

    Hi, I am new to statistics and this forum so please bear with me on this first post. I am grouping my customers into 4 groups based on their...

    Started by TheNewMarketer‎, 11-18-2014 09:27 AM
    • Replies: 0
    • Views: 251
    11-18-2014, 09:27 AM Go to last post
  49. Queuing problem

    Hey guys, I am new here and after solid hours of research on the internet, I hope you can get me started on solving my problem. It is the...

    Started by timsad‎, 11-17-2014 09:13 PM
    • Replies: 0
    • Views: 181
    11-17-2014, 09:13 PM Go to last post
  50. One-sided t-test (ANOVA) - choice of method. Thanks!

    Hey everyone, I'm about to do my first statistical study and have a question regarding what method to use. The study is rather simple in...

    Started by HonoluluViking‎, 11-16-2014 04:30 PM
    • Replies: 6
    • Views: 341
    11-17-2014, 04:46 PM Go to last post
  51. One sample t test standard error

    I am doing a one sample t test to compare a sample proportion to a known population proportion. I have two questions. First, would the standard...

    Started by noetsi‎, 11-17-2014 10:30 AM
    • Replies: 1
    • Views: 253
    11-17-2014, 11:52 AM Go to last post
  52. negative chi2 for hausman test on random vs fixed AR(1) model

    Dear all, I'm performing a Hausman test on panel data to determine whether to choose Random Effects or Fixed Effects for my analysis with AR(1)....

    Started by camino‎, 11-14-2014 10:18 AM
    • Replies: 1
    • Views: 245
    11-17-2014, 03:51 AM Go to last post
  53. test to compare an ordinal variable with a nominal variable

    In my survey I have an independent variable at nominal level with only two categories: Gender, and a Likert style question with 5 options ranging...

    Started by blubblub‎, 11-16-2014 01:54 PM
    • Replies: 0
    • Views: 200
    11-16-2014, 01:54 PM Go to last post
  54. Exclamation Endowment Insurance with Complete Life Expectancy

    Hello! I am new to actuary science and I need help for this question. Any feedback would be appreciated! Question: A five-year endowment...

    Started by Murakami‎, 11-16-2014 05:25 AM
    actuary, endowment, statistics homework
    • Replies: 1
    • Views: 209
    11-16-2014, 12:08 PM Go to last post
  55. Help me with this engineering equation

    Hi. I want to write a mathematical equation which compare if the latest notification message (a numerical number) is less than all the previous...

    Started by mianjan‎, 11-08-2014 11:24 PM
    • Replies: 1
    • Views: 380
    11-15-2014, 09:53 PM Go to last post
  56. Red face Newbie needs help: my research sample is one end of the bell curve only

    Hello forum members I did the wonderful Princeton Statistics 1 Coursera MOOC which I really enjoyed. But I have hit a problem with a project which...

    Started by imogenbertin‎, 11-05-2014 05:31 AM
    non-parametric, validity
    • Replies: 0
    • Views: 315
    11-05-2014, 05:31 AM Go to last post
  57. Two-Step Conditional Logit Model In Horse-Racing

    I'm reading "Comparing the effectiveness of one- and two-step conditional logit models for predicting outcomes in a speculative market" by Johnson...

    Started by jschatt‎, 10-24-2014 04:44 PM
    2 stage, applied, logit, regression, two stage
    • Replies: 3
    • Views: 478
    11-03-2014, 05:25 PM Go to last post
  58. Time series outliers

    In some forms of time series there are sources who argue that outliers are a major issue and should be adjusted (one suggestion is to move it just...

    Started by noetsi‎, 10-28-2014 01:44 PM
    • Replies: 0
    • Views: 295
    10-28-2014, 01:44 PM Go to last post
  59. Exponential smoothing (Holt Winston) books

    I do this every couple of months in the hope that someone out there knows a good book on this topic. I have yet to find one (well I found part of one...

    Started by noetsi‎, 10-07-2014 01:45 PM
    • Replies: 4
    • Views: 367
    10-23-2014, 09:38 AM Go to last post
  60. removing autocorrelation

    Hi everybody, I need help for my thesis please. I have a three variables var, with inflation, unemployment rate and interest rate. I have estimeted...

    Started by matteo.bianchi11‎, 10-13-2014 03:25 PM
    • Replies: 2
    • Views: 263
    10-23-2014, 09:34 AM Go to last post

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