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Forum: Applied Statistics

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

  1. 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, Today 06:41 AM
    • Replies: 3
    • Views: 70
    Today, 11:52 AM Go to last post
  2. 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, Yesterday 06:15 PM
    • Replies: 2
    • Views: 51
    Yesterday, 07:14 PM Go to last post
  3. 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 02:24 AM
    • Replies: 0
    • Views: 78
    02-26-2015, 02:24 AM Go to last post
  4. 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 12:09 PM
    actuarial, aggregate, distribution, loss, science
    • Replies: 1
    • Views: 102
    02-25-2015, 02:31 PM Go to last post
  5. 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 10:24 PM
    • Replies: 0
    • Views: 90
    02-24-2015, 10:24 PM Go to last post
  6. Basic question- Predicting "the whole from a part"

    *********x

    Started by gregoryjgold‎, 02-24-2015 08:16 AM
    basic, predict, variance
    • Replies: 0
    • Views: 78
    02-24-2015, 08:16 AM Go to last post
  7. 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 06:07 AM
    • Replies: 0
    • Views: 65
    02-23-2015, 06:07 AM Go to last post
  8. 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 11:45 AM
    • Replies: 0
    • Views: 149
    02-19-2015, 11:45 AM Go to last post
  9. 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 11:35 AM
    methodology
    • Replies: 0
    • Views: 227
    02-11-2015, 11:35 AM Go to last post
  10. 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 04:27 AM
    • Replies: 5
    • Views: 345
    02-06-2015, 01:30 PM Go to last post
  11. 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 03:55 PM
    • Replies: 2
    • Views: 291
    02-03-2015, 10:45 PM Go to last post
  12. 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 06:25 AM
    ranks
    • Replies: 3
    • Views: 297
    01-31-2015, 05:55 AM Go to last post
  13. 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 11:38 AM
    • Replies: 0
    • Views: 144
    01-28-2015, 11:38 AM Go to last post
  14. 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 02:59 PM
    qq-plot
    • Replies: 3
    • Views: 227
    01-28-2015, 09:45 AM Go to last post
  15. 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 06:38 AM
    errors, monte carlo, normal distribution
    • Replies: 0
    • Views: 141
    01-28-2015, 06:38 AM Go to last post
  16. Predictive Statistical Modeling Guide

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

    Started by consuli‎, 01-26-2015 03:08 PM
    • Replies: 0
    • Views: 178
    01-26-2015, 03:08 PM Go to last post
  17. 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 08:54 AM
    • Replies: 4
    • Views: 185
    01-26-2015, 10:59 AM Go to last post
  18. 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: 429
    01-23-2015, 09:26 AM Go to last post
  19. 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: 277
    01-22-2015, 05:52 PM Go to last post
  20. 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: 122
    01-22-2015, 03:24 PM Go to last post
  21. 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: 430
    01-21-2015, 12:27 PM Go to last post
  22. 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: 178
    01-21-2015, 07:49 AM Go to last post
  23. 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: 148
    01-20-2015, 04:12 PM Go to last post
  24. 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: 229
    01-17-2015, 11:11 AM Go to last post
  25. 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: 104
    01-16-2015, 04:44 PM Go to last post
  26. 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: 2,314
    01-16-2015, 07:43 AM Go to last post
  27. 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: 210
    01-15-2015, 11:52 AM Go to last post
  28. 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: 464
    01-13-2015, 11:01 AM Go to last post
  29. 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: 97,373
    01-12-2015, 10:35 AM Go to last post
  30. 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: 317
    01-11-2015, 06:31 AM Go to last post
  31. 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: 330
    01-10-2015, 05:51 AM Go to last post
  32. 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: 300
    01-09-2015, 07:06 PM Go to last post
  33. 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: 792
    01-09-2015, 03:36 PM Go to last post
  34. 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: 339
    01-06-2015, 10:06 AM Go to last post
  35. 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: 366
    01-05-2015, 06:50 PM Go to last post
  36. 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: 363
    01-03-2015, 12:01 PM Go to last post
  37. 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: 363
    01-02-2015, 11:44 PM Go to last post
  38. 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: 211
    01-01-2015, 11:49 PM Go to last post
  39. 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: 290
    12-30-2014, 09:08 AM Go to last post
  40. 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: 483
    12-28-2014, 04:50 AM Go to last post
  41. 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: 458
    12-28-2014, 03:07 AM Go to last post
  42. 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: 366
    12-26-2014, 04:23 PM Go to last post
  43. 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: 455
    12-22-2014, 11:40 AM Go to last post
  44. 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: 235
    12-19-2014, 09:36 AM Go to last post
  45. 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: 425
    12-17-2014, 12:46 PM Go to last post
  46. 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: 347
    12-11-2014, 03:33 PM Go to last post
  47. 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: 318
    12-11-2014, 10:15 AM Go to last post
  48. 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: 318
    12-11-2014, 08:33 AM Go to last post
  49. 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: 170
    12-11-2014, 02:37 AM Go to last post
  50. 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: 223
    12-10-2014, 11:55 PM Go to last post
  51. 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: 210
    12-10-2014, 11:35 AM Go to last post
  52. 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: 373
    12-09-2014, 10:22 AM Go to last post
  53. 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: 213
    12-08-2014, 04:25 AM Go to last post
  54. 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: 516
    12-05-2014, 01:36 AM Go to last post
  55. 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: 352
    12-04-2014, 04:36 PM Go to last post
  56. 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: 294
    12-04-2014, 04:02 PM Go to last post
  57. 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: 274
    12-03-2014, 11:53 AM Go to last post
  58. 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: 376
    11-25-2014, 01:40 PM Go to last post
  59. 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: 342
    11-24-2014, 05:01 PM Go to last post
  60. 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: 205
    11-24-2014, 03:20 AM Go to last post

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