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Forum: Applied Statistics

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

  1. 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: 94
    11-25-2014, 01:40 PM Go to last post
  2. 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: 125
    11-24-2014, 05:01 PM Go to last post
  3. 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: 1
    • Views: 114
    11-24-2014, 01:08 PM Go to last post
  4. 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: 77
    11-24-2014, 03:20 AM Go to last post
  5. 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: 378
    11-21-2014, 01:05 PM Go to last post
  6. 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: 180
    11-19-2014, 08:01 AM Go to last post
  7. 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: 95
    11-19-2014, 07:45 AM Go to last post
  8. 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: 109
    11-18-2014, 05:45 PM Go to last post
  9. 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: 93
    11-18-2014, 09:27 AM Go to last post
  10. 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: 106
    11-17-2014, 09:13 PM Go to last post
  11. 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: 211
    11-17-2014, 04:46 PM Go to last post
  12. 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: 120
    11-17-2014, 11:52 AM Go to last post
  13. 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: 111
    11-17-2014, 03:51 AM Go to last post
  14. 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: 117
    11-16-2014, 01:54 PM Go to last post
  15. 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: 113
    11-16-2014, 12:08 PM Go to last post
  16. 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: 216
    11-15-2014, 09:53 PM Go to last post
  17. 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: 238
    11-05-2014, 05:31 AM Go to last post
  18. 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: 367
    11-03-2014, 05:25 PM Go to last post
  19. 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: 205
    10-28-2014, 01:44 PM Go to last post
  20. 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: 259
    10-23-2014, 09:38 AM Go to last post
  21. 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: 155
    10-23-2014, 09:34 AM Go to last post
  22. 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: 305
    10-22-2014, 09:18 PM Go to last post
  23. 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: 230
    10-22-2014, 09:15 PM Go to last post
  24. 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: 196
    10-19-2014, 11:24 PM Go to last post
  25. 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: 336
    10-16-2014, 05:24 PM Go to last post
  26. 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: 240
    10-15-2014, 08:04 AM Go to last post
  27. 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: 194
    10-14-2014, 05:01 PM Go to last post
  28. 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: 333
    10-14-2014, 01:47 PM Go to last post
  29. 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: 176
    10-13-2014, 10:14 PM Go to last post
  30. 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: 173
    10-13-2014, 05:52 PM Go to last post
  31. 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: 154
    10-13-2014, 04:36 PM Go to last post
  32. 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: 330
    10-13-2014, 02:35 AM Go to last post
  33. 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: 177
    10-12-2014, 05:20 PM Go to last post
  34. 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: 154
    10-11-2014, 06:13 AM Go to last post
  35. 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: 198
    10-10-2014, 08:36 AM Go to last post
  36. 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: 1,667
    10-10-2014, 02:09 AM Go to last post
  37. 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: 189
    10-08-2014, 11:37 AM Go to last post
  38. 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: 181
    10-08-2014, 11:24 AM Go to last post
  39. 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: 210
    10-07-2014, 05:13 PM Go to last post
  40. 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: 164
    10-06-2014, 01:06 PM Go to last post
  41. 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: 1,309
    10-05-2014, 10:24 PM Go to last post
  42. 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: 181
    10-05-2014, 05:03 PM Go to last post
  43. 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: 143
    10-03-2014, 07:12 AM Go to last post
  44. 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: 163
    10-01-2014, 09:41 PM Go to last post
  45. 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: 364
    10-01-2014, 05:41 PM Go to last post
  46. 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: 108
    09-29-2014, 10:17 AM Go to last post
  47. 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: 215
    09-28-2014, 12:34 PM Go to last post
  48. 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: 183
    09-28-2014, 12:23 PM Go to last post
  49. 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: 503
    09-26-2014, 04:41 PM Go to last post
  50. 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: 214
    09-25-2014, 10:08 PM Go to last post
  51. 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: 149
    09-25-2014, 11:28 AM Go to last post
  52. 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: 307
    09-25-2014, 11:07 AM Go to last post
  53. 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: 136
    09-23-2014, 04:23 PM Go to last post
  54. 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: 177
    09-22-2014, 12:11 PM Go to last post
  55. 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: 441
    09-22-2014, 11:25 AM Go to last post
  56. 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: 214
    09-21-2014, 10:58 AM Go to last post
  57. 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: 183
    09-17-2014, 10:54 PM Go to last post
  58. 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: 165
    09-17-2014, 05:44 PM Go to last post
  59. 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: 203
    09-17-2014, 03:29 AM Go to last post
  60. 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: 325
    09-16-2014, 02:00 PM Go to last post

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