1. 10-14-2010
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Forum: Applied Statistics

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

  1. 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, Yesterday 03:57 AM
    • Replies: 1
    • Views: 65
    Yesterday, 11:58 AM Go to last post
  2. 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, Yesterday 09:36 AM
    • Replies: 0
    • Views: 45
    Yesterday, 09:36 AM Go to last post
  3. 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: 206
    12-17-2014, 12:46 PM Go to last post
  4. 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: 162
    12-11-2014, 03:33 PM Go to last post
  5. 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: 162
    12-11-2014, 10:15 AM Go to last post
  6. 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: 137
    12-11-2014, 08:33 AM Go to last post
  7. 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: 66
    12-11-2014, 02:37 AM Go to last post
  8. 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: 80
    12-10-2014, 11:55 PM Go to last post
  9. 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: 101
    12-10-2014, 11:35 AM Go to last post
  10. 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: 213
    12-09-2014, 10:22 AM Go to last post
  11. 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: 122
    12-08-2014, 04:25 AM Go to last post
  12. 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
    • Replies: 6
    • Views: 352
    12-05-2014, 01:36 AM Go to last post
  13. 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: 222
    12-04-2014, 04:36 PM Go to last post
  14. 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: 141
    12-04-2014, 04:02 PM Go to last post
  15. 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: 162
    12-03-2014, 11:53 AM Go to last post
  16. 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: 237
    11-25-2014, 01:40 PM Go to last post
  17. 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: 197
    11-24-2014, 05:01 PM Go to last post
  18. 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: 113
    11-24-2014, 03:20 AM Go to last post
  19. 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: 498
    11-21-2014, 01:05 PM Go to last post
  20. 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: 278
    11-19-2014, 08:01 AM Go to last post
  21. 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: 140
    11-19-2014, 07:45 AM Go to last post
  22. 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: 152
    11-18-2014, 05:45 PM Go to last post
  23. 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: 160
    11-18-2014, 09:27 AM Go to last post
  24. 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: 135
    11-17-2014, 09:13 PM Go to last post
  25. 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: 261
    11-17-2014, 04:46 PM Go to last post
  26. 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: 167
    11-17-2014, 11:52 AM Go to last post
  27. 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: 170
    11-17-2014, 03:51 AM Go to last post
  28. 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: 158
    11-16-2014, 01:54 PM Go to last post
  29. 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: 152
    11-16-2014, 12:08 PM Go to last post
  30. 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: 288
    11-15-2014, 09:53 PM Go to last post
  31. 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: 272
    11-05-2014, 05:31 AM Go to last post
  32. 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: 410
    11-03-2014, 05:25 PM Go to last post
  33. 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: 251
    10-28-2014, 01:44 PM Go to last post
  34. 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: 298
    10-23-2014, 09:38 AM Go to last post
  35. 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: 192
    10-23-2014, 09:34 AM Go to last post
  36. 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: 341
    10-22-2014, 09:18 PM Go to last post
  37. 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: 253
    10-22-2014, 09:15 PM Go to last post
  38. 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: 225
    10-19-2014, 11:24 PM Go to last post
  39. 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: 379
    10-16-2014, 05:24 PM Go to last post
  40. 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: 266
    10-15-2014, 08:04 AM Go to last post
  41. 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: 232
    10-14-2014, 05:01 PM Go to last post
  42. 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: 381
    10-14-2014, 01:47 PM Go to last post
  43. 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: 203
    10-13-2014, 10:14 PM Go to last post
  44. 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: 201
    10-13-2014, 05:52 PM Go to last post
  45. 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: 195
    10-13-2014, 04:36 PM Go to last post
  46. 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: 370
    10-13-2014, 02:35 AM Go to last post
  47. 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: 206
    10-12-2014, 05:20 PM Go to last post
  48. 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: 186
    10-11-2014, 06:13 AM Go to last post
  49. 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: 226
    10-10-2014, 08:36 AM Go to last post
  50. 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: 1,804
    10-10-2014, 02:09 AM Go to last post
  51. 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: 225
    10-08-2014, 11:37 AM Go to last post
  52. 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: 226
    10-08-2014, 11:24 AM Go to last post
  53. 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: 251
    10-07-2014, 05:13 PM Go to last post
  54. 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: 209
    10-06-2014, 01:06 PM Go to last post
  55. 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: 1,475
    10-05-2014, 10:24 PM Go to last post
  56. 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: 212
    10-05-2014, 05:03 PM Go to last post
  57. 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: 166
    10-03-2014, 07:12 AM Go to last post
  58. 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: 186
    10-01-2014, 09:41 PM Go to last post
  59. 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: 460
    10-01-2014, 05:41 PM Go to last post
  60. 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: 132
    09-29-2014, 10:17 AM Go to last post

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