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Forum: Applied Statistics

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

  1. What does p really mean.

    In trying to help another poster I realized that I did not understand this for sure myself. I suspect that, like me, many analyst analyze samples...

    Started by noetsi‎, 04-14-2015 10:30 AM
    • Replies: 7
    • Views: 2,110
    04-14-2015, 03:23 PM Go to last post
  2. comparing the performance of 2 securities

    Hi, To have a measure of the performance of a security I want to use the Jensen's Alpha (from the CAPM). I was just thinking, if I want to...

    Started by dstat2‎, 04-14-2015 10:00 AM
    jensen's ajpha, kolmogorov smirnov, stock performance
    • Replies: 0
    • Views: 1,009
    04-14-2015, 10:00 AM Go to last post
  3. Problem with output of paired Z test and normal distribution

    Hello all, Iím Steven and Iím working on a project with spectra. The case is to distinguish objects based on their spectrum. Now Iím trying to...

    Started by Steven‎, 04-13-2015 10:03 AM
    • Replies: 0
    • Views: 966
    04-13-2015, 10:03 AM Go to last post
  4. How should I forecast given the data?

    Hello all, First let me say I am not sure if this is the right section of the forum. Below you will find the data I am working with in graphical...

    Started by bigbob‎, 04-05-2015 07:49 PM
    • Replies: 5
    • Views: 2,352
    04-08-2015, 02:48 PM Go to last post
  5. Logit v. Probit: A fight to the death

    Every now and then I have to work with binary responses with continuous covariates. So of course this screams generalized linear model. The...

    Started by Dason‎, 09-13-2011 09:59 PM
    5 Pages
    1 2 3 ... 5
    logit, probit
    • Replies: 67
    • Views: 38,683
    04-08-2015, 12:47 PM Go to last post
  6. How to speed up your computations in R: a ts inspired paper.

    Hi everyone, quark requested that we highlight this paper on TS. Many of you are already aware of this paper. The article is open access, and...

    Started by TheEcologist‎, 04-06-2015 06:36 AM
    • Replies: 1
    • Views: 1,588
    04-06-2015, 07:29 AM Go to last post
  7. Control Variables

    Hello everyone, New member here. Im currently writing an econometrics paper for my honours thesis. My topic is along the lines of corporate social...

    Started by salata91‎, 04-03-2015 09:15 PM
    • Replies: 2
    • Views: 1,774
    04-05-2015, 09:27 AM Go to last post
  8. individual-level random effects and the idiosyncratic error

    Can anyone explain how some of the explanatory variables could be correlated with individual-level random effects, but that none of the explanatory...

    Started by Alexander8‎, 04-03-2015 07:11 PM
    • Replies: 0
    • Views: 1,038
    04-03-2015, 07:11 PM Go to last post
  9. How to set up manova in MATLAB for multifactor analysis

    I have 4 independent variables: Frequency (within-subjects, continuous, 16 levels) Amplitude (within-subjects, continuous, 3 levels) Time...

    Started by rorytheherb‎, 04-02-2015 07:31 PM
    between-subjects, manova, matlab, repeated measures, within-subjects
    • Replies: 0
    • Views: 3,057
    04-02-2015, 07:31 PM Go to last post
  10. SEM and normality

    Been a while since I worked with SEM. This puzzled me as I thought multivariate normality, the normality of the residuals was what mattered in...

    Started by noetsi‎, 03-30-2015 11:48 AM
    • Replies: 13
    • Views: 3,711
    03-31-2015, 08:11 AM Go to last post
  11. Correlated time series at different aggregation levels

    Hi, In my time series data I discovered the following behaviour. My time series are available in 500ms intervals and are about sensor data like...

    Started by JohnMeier‎, 03-28-2015 12:10 PM
    • Replies: 0
    • Views: 1,676
    03-28-2015, 12:10 PM Go to last post
  12. Multiple Correlation Coefficient for Time Series?

    I am using Pearsons correlation coefficient to calculate the correlation between two time series. Now I would like to calculate the correlation...

    Started by JohnMeier‎, 03-28-2015 12:08 PM
    • Replies: 0
    • Views: 1,322
    03-28-2015, 12:08 PM Go to last post
  13. 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, 03-27-2015 12:31 AM
    • Replies: 1
    • Views: 1,122
    03-27-2015, 04:56 AM Go to last post
  14. 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: 1,334
    03-21-2015, 10:20 AM Go to last post
  15. 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: 2,325
    03-21-2015, 04:14 AM Go to last post
  16. 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: 2,032
    03-20-2015, 02:55 AM Go to last post
  17. 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: 2,493
    03-17-2015, 04:58 PM Go to last post
  18. 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: 1,380
    03-10-2015, 03:29 PM Go to last post
  19. 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 06:14 AM
    • Replies: 1
    • Views: 1,820
    03-09-2015, 10:40 AM Go to last post
  20. 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 04:54 PM
    highest, lowest., outlier, probability
    • Replies: 6
    • Views: 2,138
    03-06-2015, 09:33 AM Go to last post
  21. 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 03:09 PM
    • Replies: 2
    • Views: 1,864
    03-05-2015, 03:39 PM Go to last post
  22. 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 11:39 AM
    • Replies: 3
    • Views: 2,310
    03-05-2015, 12:34 PM Go to last post
  23. 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 06:02 AM
    comparisons, finance, volatility
    • Replies: 0
    • Views: 1,874
    03-03-2015, 06:02 AM Go to last post
  24. 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 05:03 PM
    • Replies: 1
    • Views: 1,649
    03-02-2015, 05:28 PM Go to last post
  25. 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 05:22 AM
    • Replies: 0
    • Views: 1,459
    03-02-2015, 05:22 AM Go to last post
  26. 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 06:41 AM
    • Replies: 4
    • Views: 1,880
    02-28-2015, 06:06 PM Go to last post
  27. 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 06:15 PM
    • Replies: 2
    • Views: 3,875
    02-27-2015, 07:14 PM Go to last post
  28. 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: 1,323
    02-26-2015, 02:24 AM Go to last post
  29. 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: 2,578
    02-25-2015, 02:31 PM Go to last post
  30. 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: 1,645
    02-24-2015, 10:24 PM Go to last post
  31. Basic question- Predicting "the whole from a part"


    Started by gregoryjgold‎, 02-24-2015 08:16 AM
    basic, predict, variance
    • Replies: 0
    • Views: 1,640
    02-24-2015, 08:16 AM Go to last post
  32. 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: 1,545
    02-23-2015, 06:07 AM Go to last post
  33. 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: 1,656
    02-19-2015, 11:45 AM Go to last post
  34. 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
    • Replies: 0
    • Views: 2,460
    02-11-2015, 11:35 AM Go to last post
  35. 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: 2,602
    02-06-2015, 01:30 PM Go to last post
  36. 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: 2,237
    02-03-2015, 10:45 PM Go to last post
  37. 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
    • Replies: 3
    • Views: 4,461
    01-31-2015, 05:55 AM Go to last post
  38. 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: 2,071
    01-28-2015, 11:38 AM Go to last post
  39. 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
    • Replies: 3
    • Views: 2,013
    01-28-2015, 09:45 AM Go to last post
  40. 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: 1,781
    01-28-2015, 06:38 AM Go to last post
  41. 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: 2,290
    01-26-2015, 03:08 PM Go to last post
  42. 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: 2,151
    01-26-2015, 10:59 AM Go to last post
  43. 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: 3,710
    01-23-2015, 09:26 AM Go to last post
  44. 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: 1,872
    01-22-2015, 05:52 PM Go to last post
  45. 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: 1,520
    01-22-2015, 03:24 PM Go to last post
  46. 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: 2,507
    01-21-2015, 12:27 PM Go to last post
  47. 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: 2,125
    01-21-2015, 07:49 AM Go to last post
  48. 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: 1,431
    01-20-2015, 04:12 PM Go to last post
  49. 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: 2,094
    01-17-2015, 11:11 AM Go to last post
  50. 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: 2,089
    01-16-2015, 04:44 PM Go to last post
  51. 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
    • Replies: 15
    • Views: 10,871
    01-16-2015, 07:43 AM Go to last post
  52. 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: 2,431
    01-15-2015, 11:52 AM Go to last post
  53. 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: 2,488
    01-13-2015, 11:01 AM Go to last post
  54. 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: 1,520
    01-11-2015, 06:31 AM Go to last post
  55. 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: 1,974
    01-10-2015, 05:51 AM Go to last post
  56. 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: 2,825
    01-09-2015, 07:06 PM Go to last post
  57. 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: 8,847
    01-09-2015, 03:36 PM Go to last post
  58. 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: 3,276
    01-06-2015, 10:06 AM Go to last post
  59. 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: 3,093
    01-05-2015, 06:50 PM Go to last post
  60. 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: 1,693
    01-03-2015, 12:01 PM Go to last post

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