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Forum: Applied Statistics

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

  1. 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: 1,695
    01-03-2015, 12:01 PM Go to last post
  2. Performance Improvement

    I apologize if this is the wrong place, or not even applicable (please remove if so). However this was my last attempt to try and figure out this...

    Started by ndsarantis‎, 12-29-2014 04:21 PM
    • Replies: 7
    • Views: 2,513
    01-02-2015, 11:44 PM Go to last post
  3. Cool Calculating End-of-year performance for IRA when base changes during the year.

    Hi Everyone, One the surface, this would seem to be an extremely simple calculation... but it has me stumped. To demonstrate, I'll give you two...

    Started by Dorftrottel‎, 01-01-2015 11:49 PM
    • Replies: 0
    • Views: 1,710
    01-01-2015, 11:49 PM Go to last post
  4. Fit statistics - why is this so

    I was/am reading an econometric book commenting on R squared specifically, but fit statistics more generally. The author makes the following comment...

    Started by noetsi‎, 12-29-2014 05:05 PM
    • Replies: 2
    • Views: 2,372
    12-30-2014, 09:08 AM Go to last post
  5. Combining performance metrics

    Hi All and Merry Christmas to those that are celebrating. I have a querie about how to combine different metrics relating to performace of a...

    Started by extant‎, 12-24-2014 10:24 PM
    • Replies: 5
    • Views: 4,477
    12-28-2014, 04:50 AM Go to last post
  6. Which statistical test? Interobserver variation

    Dear all! I am trying to compare the ability of experienced pathologist and residents in scoring percentage of cancer timor cells in some images of...

    Started by lufthoved‎, 12-27-2014 05:34 PM
    • Replies: 4
    • Views: 3,169
    12-28-2014, 03:07 AM Go to last post
  7. Football Injury Stats

    So I came across this article about English Premier League football clubs and injuries. A data analyst has "clearly demonstrate(d) that Arsenal do...

    Started by Prometheus‎, 12-23-2014 07:00 PM
    • Replies: 6
    • Views: 2,717
    12-26-2014, 04:23 PM Go to last post
  8. 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, 12-19-2014 03:57 AM
    • Replies: 4
    • Views: 2,536
    12-22-2014, 11:40 AM Go to last post
  9. 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, 12-19-2014 09:36 AM
    • Replies: 0
    • Views: 1,769
    12-19-2014, 09:36 AM Go to last post
  10. 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: 3,467
    12-17-2014, 12:46 PM Go to last post
  11. 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: 1,798
    12-11-2014, 03:33 PM Go to last post
  12. 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: 1,976
    12-11-2014, 10:15 AM Go to last post
  13. 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: 2,905
    12-11-2014, 08:33 AM Go to last post
  14. 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: 1,222
    12-11-2014, 02:37 AM Go to last post
  15. 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: 1,305
    12-10-2014, 11:55 PM Go to last post
  16. 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: 1,216
    12-10-2014, 11:35 AM Go to last post
  17. 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: 2,569
    12-09-2014, 10:22 AM Go to last post
  18. 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: 1,562
    12-08-2014, 04:25 AM Go to last post
  19. 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
    bio-equivalence
    • Replies: 6
    • Views: 2,262
    12-05-2014, 01:36 AM Go to last post
  20. 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: 2,595
    12-04-2014, 04:36 PM Go to last post
  21. 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: 6,169
    12-04-2014, 04:02 PM Go to last post
  22. 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: 1,610
    12-03-2014, 11:53 AM Go to last post
  23. 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: 2,804
    11-25-2014, 01:40 PM Go to last post
  24. 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: 1,997
    11-24-2014, 05:01 PM Go to last post
  25. 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: 1,150
    11-24-2014, 03:20 AM Go to last post
  26. 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: 2,916
    11-21-2014, 01:05 PM Go to last post
  27. 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: 1,298
    11-19-2014, 08:01 AM Go to last post
  28. 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: 1,208
    11-19-2014, 07:45 AM Go to last post
  29. 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: 1,481
    11-18-2014, 05:45 PM Go to last post
  30. 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: 1,115
    11-18-2014, 09:27 AM Go to last post
  31. 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: 1,206
    11-17-2014, 09:13 PM Go to last post
  32. 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: 1,705
    11-17-2014, 04:46 PM Go to last post
  33. 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: 1,118
    11-17-2014, 11:52 AM Go to last post
  34. 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: 4,209
    11-17-2014, 03:51 AM Go to last post
  35. 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: 1,177
    11-16-2014, 01:54 PM Go to last post
  36. 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: 1,497
    11-16-2014, 12:08 PM Go to last post
  37. 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: 1,681
    11-15-2014, 09:53 PM Go to last post
  38. 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: 1,867
    11-05-2014, 05:31 AM Go to last post
  39. 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 03:44 PM
    2 stage, applied, logit, regression, two stage
    • Replies: 3
    • Views: 3,108
    11-03-2014, 05:25 PM Go to last post
  40. 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 12:44 PM
    • Replies: 0
    • Views: 1,427
    10-28-2014, 12:44 PM Go to last post
  41. 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 12:45 PM
    • Replies: 4
    • Views: 2,135
    10-23-2014, 08:38 AM Go to last post
  42. 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 02:25 PM
    • Replies: 2
    • Views: 4,639
    10-23-2014, 08:34 AM Go to last post
  43. 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 07:40 AM
    • Replies: 10
    • Views: 2,674
    10-22-2014, 08:18 PM Go to last post
  44. 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 09:58 PM
    • Replies: 2
    • Views: 1,618
    10-22-2014, 08:15 PM Go to last post
  45. 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 10:24 PM
    margin of error, sample size
    • Replies: 0
    • Views: 1,139
    10-19-2014, 10:24 PM Go to last post
  46. 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 06:06 PM
    • Replies: 3
    • Views: 2,171
    10-16-2014, 04:24 PM Go to last post
  47. 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 06:56 AM
    • Replies: 1
    • Views: 2,128
    10-15-2014, 07:04 AM Go to last post
  48. 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 03:27 PM
    • Replies: 2
    • Views: 1,614
    10-14-2014, 04:01 PM Go to last post
  49. 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 12:59 PM
    • Replies: 5
    • Views: 3,063
    10-14-2014, 12:47 PM Go to last post
  50. 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 09:14 PM
    • Replies: 0
    • Views: 3,403
    10-13-2014, 09:14 PM Go to last post
  51. 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 04:52 PM
    • Replies: 0
    • Views: 1,489
    10-13-2014, 04:52 PM Go to last post
  52. 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 03:36 PM
    mancova, step-down analysis
    • Replies: 0
    • Views: 3,261
    10-13-2014, 03:36 PM Go to last post
  53. 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 04:29 AM
    • Replies: 4
    • Views: 3,325
    10-13-2014, 01:35 AM Go to last post
  54. 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 04:20 PM
    • Replies: 0
    • Views: 3,827
    10-12-2014, 04:20 PM Go to last post
  55. 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 05:13 AM
    file prediction backlog
    • Replies: 0
    • Views: 1,250
    10-11-2014, 05:13 AM Go to last post
  56. 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 07:36 AM
    glm, proportions, ratios
    • Replies: 0
    • Views: 1,545
    10-10-2014, 07:36 AM Go to last post
  57. 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: 5,800
    10-10-2014, 01:09 AM Go to last post
  58. 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 10:37 AM
    bsadf adf, gsadf, psy
    • Replies: 0
    • Views: 3,766
    10-08-2014, 10:37 AM Go to last post
  59. 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 10:24 AM
    • Replies: 0
    • Views: 3,381
    10-08-2014, 10:24 AM Go to last post
  60. 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 10:41 AM
    • Replies: 4
    • Views: 2,667
    10-07-2014, 04:13 PM Go to last post

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