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Forum: Applied Statistics

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

  1. 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, Today 03:20 AM
    • Replies: 0
    • Views: 56
    Today, 03:20 AM Go to last post
  2. 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: 359
    11-21-2014, 01:05 PM Go to last post
  3. 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: 168
    11-19-2014, 08:01 AM Go to last post
  4. 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: 89
    11-19-2014, 07:45 AM Go to last post
  5. 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: 104
    11-18-2014, 05:45 PM Go to last post
  6. 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: 87
    11-18-2014, 09:27 AM Go to last post
  7. 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: 102
    11-17-2014, 09:13 PM Go to last post
  8. 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: 206
    11-17-2014, 04:46 PM Go to last post
  9. 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: 113
    11-17-2014, 11:52 AM Go to last post
  10. 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: 105
    11-17-2014, 03:51 AM Go to last post
  11. 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: 112
    11-16-2014, 01:54 PM Go to last post
  12. 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: 102
    11-16-2014, 12:08 PM Go to last post
  13. 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: 211
    11-15-2014, 09:53 PM Go to last post
  14. 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: 232
    11-05-2014, 05:31 AM Go to last post
  15. 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: 364
    11-03-2014, 05:25 PM Go to last post
  16. 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: 195
    10-28-2014, 01:44 PM Go to last post
  17. 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: 252
    10-23-2014, 09:38 AM Go to last post
  18. 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: 153
    10-23-2014, 09:34 AM Go to last post
  19. Dealing with outliers

    I understand that many say you should not remove outliers not caused by clerical error. But in many cases they badly distort the data. Methods to...

    Started by noetsi‎, 10-07-2014 08:40 AM
    • Replies: 10
    • Views: 302
    10-22-2014, 09:18 PM Go to last post
  20. Retail Sales History

    Hi, I was looking at some charts via Wolfram Alpha and noticed a peculiar pattern. Click here Scroll down to see the Retail Sales History...

    Started by Khrisstian‎, 10-12-2014 10:58 PM
    • Replies: 2
    • Views: 228
    10-22-2014, 09:15 PM Go to last post
  21. Sample size determination (margin of error)

    Hi all, I notice my organization does not follow to NIST standards and I seek for help from the community: All the while, my company has been...

    Started by polaris-gp‎, 10-19-2014 11:24 PM
    margin of error, sample size
    • Replies: 0
    • Views: 193
    10-19-2014, 11:24 PM Go to last post
  22. Can you go from ACS margin of errors to standard deviations?

    To skip reading the whole thing, does anyone know how to find the standard deviations (not standard errors which I have already) for the American...

    Started by noetsi‎, 10-14-2014 07:06 PM
    • Replies: 3
    • Views: 332
    10-16-2014, 05:24 PM Go to last post
  23. T-Test on on excess returns above an index

    I am really struggling with the results of some T-tests which I have been running. I have a few questions which I cannot find answers to on google...

    Started by lukepurdon‎, 10-15-2014 07:56 AM
    • Replies: 1
    • Views: 237
    10-15-2014, 08:04 AM Go to last post
  24. Obtaining standard deviation from margin of error

    I need the standard deviation to do a one sample t test. My understanding was that the standard deviation of a sample was equal to the margin of...

    Started by noetsi‎, 10-14-2014 04:27 PM
    • Replies: 2
    • Views: 191
    10-14-2014, 05:01 PM Go to last post
  25. test of sample proportion against known population value

    We have a known population value of our customers which is a proportion. For example the percent of the population that is white. We have a census...

    Started by noetsi‎, 10-10-2014 01:59 PM
    • Replies: 5
    • Views: 326
    10-14-2014, 01:47 PM Go to last post
  26. Exclamation Linear Programming Help?

    Groovy Juice Mixers, Inc. mixes specialty drinks out of grape, guava, and papaya juices. Currently it has 1000, 400, and 300 gallons of each of these...

    Started by usn32‎, 10-13-2014 10:14 PM
    • Replies: 0
    • Views: 171
    10-13-2014, 10:14 PM Go to last post
  27. Incorporating observation weights into logistic regression using clogit package in R

    I'm working on running conditional logistic regression on some habitat use data using the package clogit in R. The data is composed of GPS fixes...

    Started by RosieRu‎, 10-13-2014 05:52 PM
    • Replies: 0
    • Views: 171
    10-13-2014, 05:52 PM Go to last post
  28. MANCOVA and step-down analysis

    I have a question concerning the use of step-down analysis after MANCOVA. While I understand the steps for MANOVA, when I started using a covariate...

    Started by Chavanne‎, 10-13-2014 04:36 PM
    mancova, step-down analysis
    • Replies: 0
    • Views: 148
    10-13-2014, 04:36 PM Go to last post
  29. Similarity coefficient: assessing significance (permutation,bootstrap, neither?)

    Hello. In my spare time, I was playing with a similarity measure that finds use in archaeology. It is a coefficient devised in the 1950s, whose name...

    Started by gianmarco‎, 10-12-2014 05:29 AM
    • Replies: 4
    • Views: 325
    10-13-2014, 02:35 AM Go to last post
  30. Likelihood survey question

    There is a survey question which like this: How likely are you to return an item? 0=Not likely at all 123456789 10=most likely The...

    Started by Trolle‎, 10-12-2014 05:20 PM
    • Replies: 0
    • Views: 174
    10-12-2014, 05:20 PM Go to last post
  31. Question Prediction of dossier treatment date based on backlog development.

    It has been over 30 years since I encountered statistical problems and did any data analysis, so I do not remember anything about regression and...

    Started by Dan_NL‎, 10-11-2014 06:13 AM
    file prediction backlog
    • Replies: 0
    • Views: 147
    10-11-2014, 06:13 AM Go to last post
  32. Question How to model weighted average ratios in the [0,1] interval

    Maarten Buis on this forum provided great insight on how to model percentages in the interval...

    Started by JohnDoe2014‎, 10-10-2014 08:36 AM
    glm, proportions, ratios
    • Replies: 0
    • Views: 193
    10-10-2014, 08:36 AM Go to last post
  33. testing for autocorrelation in PERMANOVA

    Hi, I am new to this forum and would like to thank everyone in advance for their help now and in the future. I have some data collected as...

    Started by shokee46‎, 11-20-2012 02:58 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 1,654
    10-10-2014, 02:09 AM Go to last post
  34. GSADF Discussion

    I am running a GSADF to replicate a paper on grain price exuberance and am having difficulties replicating the results. I can't find too many places...

    Started by vikingo‎, 10-08-2014 11:37 AM
    bsadf adf, gsadf, psy
    • Replies: 0
    • Views: 186
    10-08-2014, 11:37 AM Go to last post
  35. Weibull Analysis (Weibayes) - No failure

    If I have a system (all electronics) which has accumulated test hours and has had no failures, the Weibayes method is recommended. And eta can then...

    Started by ChootarLaal‎, 10-08-2014 11:24 AM
    • Replies: 0
    • Views: 172
    10-08-2014, 11:24 AM Go to last post
  36. Sphericity assumption

    Sphericity is the assumptionthat "the variances of the differences between all pairs of the repeated measures are the same". Geoff Der in a book of...

    Started by noetsi‎, 10-07-2014 11:41 AM
    • Replies: 4
    • Views: 208
    10-07-2014, 05:13 PM Go to last post
  37. Influence of frequency on contigency table

    If there are binomial observations, and binomial conditions, what is the influence of frequency and how to determine the "correct" frequency. For...

    Started by JVorwald‎, 10-06-2014 12:09 PM
    contingency table, frequen
    • Replies: 1
    • Views: 159
    10-06-2014, 01:06 PM Go to last post
  38. Linearity

    A key issue for me is to determine if my data is non-linear and determine ways to make it linear if possible. An approach that looks promising to me...

    Started by noetsi‎, 09-23-2014 11:57 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 1,301
    10-05-2014, 10:24 PM Go to last post
  39. Poisson distribution and muon decays

    Hello, I have gathered muon decay data and used R's non linear least squares function to find the mean muon lifetime. I did this by taking the...

    Started by cohara‎, 10-05-2014 01:13 PM
    matlab, muon, poisson, statistical computing
    • Replies: 1
    • Views: 177
    10-05-2014, 05:03 PM Go to last post
  40. Statistics of fault indicator and maintenance for repairable fleet

    There is a fleet of repairable units and the units have system health measurements which consist primarily of vibration amplitudes. The health...

    Started by JVorwald‎, 10-03-2014 07:12 AM
    accuracy, maintenance, reliability, repair
    • Replies: 0
    • Views: 141
    10-03-2014, 07:12 AM Go to last post
  41. Comparing estimates from a mixed-effect model and submodels

    Hi, I have a estimated coefficients for mixed-effect logistic regression model with three factors (A, B, C) and three interactions. The estimates ...

    Started by Scarlatti‎, 10-01-2014 09:41 PM
    • Replies: 0
    • Views: 161
    10-01-2014, 09:41 PM Go to last post
  42. beta distribution

    Alpha and beta are two parameters that jointly determine the shape of a beta distribution. So far I have not found a good discussion of what these...

    Started by noetsi‎, 10-01-2014 01:49 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 362
    10-01-2014, 05:41 PM Go to last post
  43. Exponential Smoothing Books

    I have spent a really long time looking for good books on this topic. I found one using SAS (Milhoj), but it only covered a small portion of what I...

    Started by noetsi‎, 09-29-2014 10:17 AM
    • Replies: 0
    • Views: 106
    09-29-2014, 10:17 AM Go to last post
  44. longitudinal multivariate data - multivariate repeated measures

    Hi! Am dealing with a multivariate longitudinal data where we collect data from two group of subjects (cases and controls) at baseline , one month...

    Started by risu‎, 09-26-2014 02:46 AM
    collinearity, longitudinal, multivariate data, repeated measures
    • Replies: 1
    • Views: 213
    09-28-2014, 12:34 PM Go to last post
  45. Two-stage fixed-effects panel model - how should I interpret the coefficients?

    Hello all: I ran a 2-stage fixed-effects panel model in R. The goal is to find the effect of strategic alliance participation on firm performance....

    Started by jayhawk‎, 09-28-2014 12:23 PM
    interpreting results, panel fixed effects, two stage
    • Replies: 0
    • Views: 175
    09-28-2014, 12:23 PM Go to last post
  46. QQ plots

    I have worked on these exclusively in the past in the context of normal distribution. A software generates a diagonal line which represents a normal...

    Started by noetsi‎, 09-25-2014 05:51 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 488
    09-26-2014, 04:41 PM Go to last post
  47. Bonferoni when running multiple models

    Like lots of other people I suspect :p I commonly run many models with the same data. For example I might run five variables, than transform one and...

    Started by noetsi‎, 09-25-2014 11:10 AM
    • Replies: 2
    • Views: 209
    09-25-2014, 10:08 PM Go to last post
  48. Testing when one year's sales volumes vary significantly from this time last year

    Hi all, I have a puzzle regarding sales volumes and how to know whether, 6-months into the year, for example, my current volume is on track for...

    Started by mdc35‎, 09-25-2014 11:28 AM
    sales, statistical tests, time series analysis
    • Replies: 0
    • Views: 147
    09-25-2014, 11:28 AM Go to last post
  49. Assumption Wilcoxon signed rank test

    This is analogous to a one sample t test. I have found what seems like disagreement about the assumptions of this method. Some say that it only...

    Started by noetsi‎, 09-24-2014 03:31 PM
    • Replies: 6
    • Views: 295
    09-25-2014, 11:07 AM Go to last post
  50. Variance decomposition

    I am trying to compute a variance decomposition, based on a variance components model. Specifically, price variability explained by variability...

    Started by jsaldain‎, 09-23-2014 04:23 PM
    • Replies: 0
    • Views: 134
    09-23-2014, 04:23 PM Go to last post
  51. New Member Assistance: RPI Calculation for Sports Application

    I am a volunteer with the Ontario minor hockey system and we are investigating ranking systems for our youth teams. Is anyone aware where I could...

    Started by holmesy‎, 09-22-2014 12:11 PM
    • Replies: 0
    • Views: 169
    09-22-2014, 12:11 PM Go to last post
  52. do we need to test for stationarity if not using autocorrelation?

    hi everyone, just a quick question. i know for time series, we need to test for stationarity before we can run ARIMA type models. what if i am just...

    Started by jimjohn‎, 09-07-2014 08:03 PM
    • Replies: 6
    • Views: 434
    09-22-2014, 11:25 AM Go to last post
  53. autocorrelation tests

    Hi everybody, I have a question about residual autocorrelation tests on eviews 8 student version. I estimated a var model, and I'd like to test...

    Started by matteo.bianchi11‎, 09-21-2014 10:58 AM
    • Replies: 0
    • Views: 210
    09-21-2014, 10:58 AM Go to last post
  54. would like ffedback on right Machine Learning Method to apply

    Hi I am new to big data and I am trying to decide on a learning project to do. I have a imaginary "new" widget design out in the field being...

    Started by jscriptor09‎, 09-17-2014 10:54 PM
    • Replies: 0
    • Views: 179
    09-17-2014, 10:54 PM Go to last post
  55. Customer segmentation effectiveness

    Hi, I have a question. I have a dataset of a few customer segments, their customers, the products they bought and the margin at the moment of...

    Started by stats_starter‎, 09-17-2014 05:44 PM
    • Replies: 0
    • Views: 162
    09-17-2014, 05:44 PM Go to last post
  56. A/B/C Conversion Optimisation

    Hi All, I'm trying to understand the process behind testing both A/B site changes for statistically significant increases in conversion rate, and...

    Started by samg86‎, 09-17-2014 03:29 AM
    a/b testing, binomial, optimisation, z-test
    • Replies: 0
    • Views: 196
    09-17-2014, 03:29 AM Go to last post
  57. experiment results between workers in a laboratory - which test

    Hi all, (this is my first post) I need to compare the performances of technicians in the lab for a specific experiment. There is no defined or...

    Started by glacierst‎, 09-12-2014 05:15 AM
    • Replies: 4
    • Views: 322
    09-16-2014, 02:00 PM Go to last post
  58. Statistical procedure problem

    Hello. I recently entered the world of corporate data mining, and I'm a bit stumped with a request from my boss. I'm pretty well versed on a variety...

    Started by J.J.‎, 09-13-2014 04:45 PM
    • Replies: 0
    • Views: 242
    09-13-2014, 04:45 PM Go to last post
  59. Question Urgent Help needed regarding r1 Autocorrelation

    I'm searching from past 2 hours on the internet and I'm unable to find a solved example of calculating r1 first coefficient of correlation from the...

    Started by Dawood‎, 09-10-2014 04:48 PM
    autocorrelation, econometrics
    • Replies: 1
    • Views: 250
    09-10-2014, 09:10 PM Go to last post
  60. How to compare pre-post outcome when each subject react differently?

    I have 11 subjects with pre and post outcome (two repeated measures). I'd like to test the difference between both conditions. The problem is...

    Started by Themistocle‎, 09-07-2014 01:12 PM
    paired comparisons
    • Replies: 6
    • Views: 271
    09-10-2014, 04:09 PM Go to last post

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