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Forum: Applied Statistics

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

  1. Modeling parking meter usage with data from just smartphone payments

    How could a municipality extrapolate usage data from the revenues from smartphone users (56% in DC per http://goo.gl/WpGyuc) to accurately model...

    Started by cattledog‎, 04-21-2015 04:02 PM
    • Replies: 1
    • Views: 90
    Yesterday, 05:26 AM Go to last post
  2. Process capability - Negative Binomial

    Dear All, I have attribute that show overdispersion and seem to be distributed according to a negative binomial distribution. I have the...

    Started by ferbg‎, 04-22-2015 02:40 AM
    attribute data, negative binomial, poisson, process capability
    • Replies: 1
    • Views: 69
    Yesterday, 05:21 AM Go to last post
  3. Audit Sample Size

    Attempting to complete an audit of personnel files. The total population is 393. Each personnel file should have 4 documents. A missing document...

    Started by rlmx‎, 04-23-2015 03:29 PM
    • Replies: 0
    • Views: 67
    04-23-2015, 03:29 PM Go to last post
  4. Smile Grouping data segments and applying % modifiers to maximise output

    I'm trying to determine the best way to approach an optimization problem, but have been struggling to determine what statistical methods are...

    Started by samg86‎, 04-22-2015 05:00 AM
    methodology, optimization, permutation
    • Replies: 0
    • Views: 86
    04-22-2015, 05:00 AM Go to last post
  5. Urgent help needed: can I take mean of correlation coeficients?

    Historic market (Cash) prices and future contract prices are available for last 4 years. I have found correlation between Jan'11 market price with...

    Started by TheMonkster‎, 04-21-2015 11:44 PM
    cointegration, correlation analysis, hedging
    • Replies: 1
    • Views: 55
    04-22-2015, 02:23 AM Go to last post
  6. Moved: rollapply with Arima model: testing for stability of coefficients

    Started by nour88‎, 04-18-2015 10:18 AM
    • Replies: -
    • Views: -
    04-20-2015, 12:41 PM Go to last post
  7. Question Time varying Cox regression using SPSS

    Dear all, I need help regarding data set up and the right command for time varying dependent variables. I am using financial data and for that I...

    Started by roslina‎, 04-18-2015 02:20 PM
    • Replies: 0
    • Views: 121
    04-18-2015, 02:20 PM Go to last post
  8. Standard deviatiom of percentage changes

    Hi all, I need to calculate de standard deviation of a percentage changes time series. This time series shows the changes in sales versus the same...

    Started by afabris‎, 04-16-2015 09:20 AM
    • Replies: 0
    • Views: 138
    04-16-2015, 09:20 AM Go to last post
  9. Question Help with Sequential Sampling where H0 is that both samples are same distribution

    Hi, I wonder if anyone could advise? My aim is to compare the results of two randomized algorithms to prove that one does better than the other....

    Started by Geoff‎, 04-16-2015 06:19 AM
    hypotheses testing, sequential sampling, sprt
    • Replies: 0
    • Views: 78
    04-16-2015, 06:19 AM Go to last post
  10. Methods section- can I use the term inferential statistics if I dont have a sample

    I am writing a report and need to write a very brief method section. I basically describe my sample (frequencies), some cross tabulations, and see...

    Started by Marvin85‎, 04-06-2015 04:42 PM
    2 Pages
    1 2
    inferential, methods
    • Replies: 15
    • Views: 586
    04-14-2015, 04:10 PM Go to last post
  11. 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: 203
    04-14-2015, 03:23 PM Go to last post
  12. 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: 87
    04-14-2015, 10:00 AM Go to last post
  13. Problem with output of paired Z test and normal distribution

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

    Started by Steven‎, 04-13-2015 10:03 AM
    • Replies: 0
    • Views: 101
    04-13-2015, 10:03 AM Go to last post
  14. 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: 343
    04-08-2015, 02:48 PM Go to last post
  15. 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: 19,114
    04-08-2015, 12:47 PM Go to last post
  16. 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: 138
    04-06-2015, 07:29 AM Go to last post
  17. 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: 195
    04-05-2015, 09:27 AM Go to last post
  18. 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
    econometrics
    • Replies: 0
    • Views: 105
    04-03-2015, 07:11 PM Go to last post
  19. 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: 121
    04-02-2015, 07:31 PM Go to last post
  20. 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: 14
    • Views: 524
    03-31-2015, 04:01 PM Go to last post
  21. 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: 386
    03-31-2015, 08:11 AM Go to last post
  22. 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: 194
    03-28-2015, 12:10 PM Go to last post
  23. 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: 167
    03-28-2015, 12:08 PM Go to last post
  24. 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: 929
    03-27-2015, 11:56 AM Go to last post
  25. 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: 195
    03-27-2015, 04:56 AM Go to last post
  26. 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: 102,637
    03-23-2015, 02:56 AM Go to last post
  27. 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: 154
    03-21-2015, 10:20 AM Go to last post
  28. 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: 220
    03-21-2015, 04:14 AM Go to last post
  29. 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: 221
    03-20-2015, 02:55 AM Go to last post
  30. 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: 227
    03-17-2015, 04:58 PM Go to last post
  31. 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: 230
    03-14-2015, 01:09 AM Go to last post
  32. 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: 254
    03-10-2015, 03:29 PM Go to last post
  33. 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: 260
    03-09-2015, 10:40 AM Go to last post
  34. 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: 329
    03-06-2015, 08:33 AM Go to last post
  35. 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: 166
    03-05-2015, 02:39 PM Go to last post
  36. 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: 255
    03-05-2015, 11:34 AM Go to last post
  37. 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: 202
    03-03-2015, 05:02 AM Go to last post
  38. 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: 215
    03-02-2015, 04:28 PM Go to last post
  39. 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: 207
    03-02-2015, 04:22 AM Go to last post
  40. 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: 330
    02-28-2015, 05:06 PM Go to last post
  41. 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: 265
    02-27-2015, 06:14 PM Go to last post
  42. 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: 204
    02-26-2015, 01:24 AM Go to last post
  43. 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: 234
    02-25-2015, 01:31 PM Go to last post
  44. 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: 183
    02-24-2015, 09:24 PM Go to last post
  45. Basic question- Predicting "the whole from a part"

    *********x

    Started by gregoryjgold‎, 02-24-2015 07:16 AM
    basic, predict, variance
    • Replies: 0
    • Views: 170
    02-24-2015, 07:16 AM Go to last post
  46. 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: 167
    02-23-2015, 05:07 AM Go to last post
  47. 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: 272
    02-19-2015, 10:45 AM Go to last post
  48. 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: 332
    02-11-2015, 10:35 AM Go to last post
  49. 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: 516
    02-06-2015, 12:30 PM Go to last post
  50. 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: 410
    02-03-2015, 09:45 PM Go to last post
  51. 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: 438
    01-31-2015, 04:55 AM Go to last post
  52. 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: 240
    01-28-2015, 10:38 AM Go to last post
  53. 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: 345
    01-28-2015, 08:45 AM Go to last post
  54. 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: 235
    01-28-2015, 05:38 AM Go to last post
  55. 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: 293
    01-26-2015, 02:08 PM Go to last post
  56. 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: 314
    01-26-2015, 09:59 AM Go to last post
  57. 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: 567
    01-23-2015, 08:26 AM Go to last post
  58. 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: 373
    01-22-2015, 04:52 PM Go to last post
  59. 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: 193
    01-22-2015, 02:24 PM Go to last post
  60. 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: 560
    01-21-2015, 11:27 AM Go to last post

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