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Forum: Applied Statistics

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

  1. 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, Yesterday 10:24 PM
    margin of error, sample size
    • Replies: 0
    • Views: 91
    Yesterday, 10:24 PM Go to last post
  2. 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: 251
    10-16-2014, 04:24 PM Go to last post
  3. 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: 181
    10-15-2014, 07:04 AM Go to last post
  4. 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: 141
    10-14-2014, 04:01 PM Go to last post
  5. 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: 264
    10-14-2014, 12:47 PM Go to last post
  6. 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: 118
    10-13-2014, 09:14 PM Go to last post
  7. 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: 122
    10-13-2014, 04:52 PM Go to last post
  8. 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: 99
    10-13-2014, 03:36 PM Go to last post
  9. 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: 1
    • Views: 89
    10-13-2014, 03:20 PM Go to last post
  10. 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: 251
    10-13-2014, 01:35 AM Go to last post
  11. 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: 1
    • Views: 134
    10-12-2014, 11:41 PM Go to last post
  12. 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: 127
    10-12-2014, 04:20 PM Go to last post
  13. 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: 109
    10-11-2014, 05:13 AM Go to last post
  14. 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: 143
    10-10-2014, 07:36 AM Go to last post
  15. 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 01:58 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 1,552
    10-10-2014, 01:09 AM Go to last post
  16. 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: 139
    10-08-2014, 10:37 AM Go to last post
  17. 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: 99
    10-08-2014, 10:24 AM Go to last post
  18. 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: 168
    10-07-2014, 04:13 PM 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 07:40 AM
    • Replies: 9
    • Views: 197
    10-07-2014, 03:05 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 12:45 PM
    • Replies: 3
    • Views: 111
    10-07-2014, 02:22 PM Go to last post
  21. 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 11:09 AM
    contingency table, frequen
    • Replies: 1
    • Views: 122
    10-06-2014, 12:06 PM Go to last post
  22. 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 10:57 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 1,090
    10-05-2014, 09:24 PM Go to last post
  23. 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 12:13 PM
    matlab, muon, poisson, statistical computing
    • Replies: 1
    • Views: 145
    10-05-2014, 04:03 PM Go to last post
  24. 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 06:12 AM
    accuracy, maintenance, reliability, repair
    • Replies: 0
    • Views: 115
    10-03-2014, 06:12 AM Go to last post
  25. 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 08:41 PM
    • Replies: 0
    • Views: 132
    10-01-2014, 08:41 PM Go to last post
  26. 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 12:49 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 283
    10-01-2014, 04:41 PM Go to last post
  27. 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 09:17 AM
    • Replies: 0
    • Views: 81
    09-29-2014, 09:17 AM Go to last post
  28. 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 01:46 AM
    collinearity, longitudinal, multivariate data, repeated measures
    • Replies: 1
    • Views: 184
    09-28-2014, 11:34 AM Go to last post
  29. 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 11:23 AM
    interpreting results, panel fixed effects, two stage
    • Replies: 0
    • Views: 136
    09-28-2014, 11:23 AM Go to last post
  30. 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 04:51 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 402
    09-26-2014, 03:41 PM Go to last post
  31. 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 10:10 AM
    • Replies: 2
    • Views: 171
    09-25-2014, 09:08 PM Go to last post
  32. 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 10:28 AM
    sales, statistical tests, time series analysis
    • Replies: 0
    • Views: 112
    09-25-2014, 10:28 AM Go to last post
  33. 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 02:31 PM
    • Replies: 6
    • Views: 254
    09-25-2014, 10:07 AM Go to last post
  34. 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 03:23 PM
    • Replies: 0
    • Views: 108
    09-23-2014, 03:23 PM Go to last post
  35. 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 11:11 AM
    • Replies: 0
    • Views: 137
    09-22-2014, 11:11 AM Go to last post
  36. 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 07:03 PM
    • Replies: 6
    • Views: 387
    09-22-2014, 10:25 AM Go to last post
  37. 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 09:58 AM
    • Replies: 0
    • Views: 171
    09-21-2014, 09:58 AM Go to last post
  38. 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 09:54 PM
    • Replies: 0
    • Views: 151
    09-17-2014, 09:54 PM Go to last post
  39. 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 04:44 PM
    • Replies: 0
    • Views: 129
    09-17-2014, 04:44 PM Go to last post
  40. 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 02:29 AM
    a/b testing, binomial, optimisation, z-test
    • Replies: 0
    • Views: 153
    09-17-2014, 02:29 AM Go to last post
  41. 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 04:15 AM
    • Replies: 4
    • Views: 288
    09-16-2014, 01:00 PM Go to last post
  42. 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 03:45 PM
    • Replies: 0
    • Views: 210
    09-13-2014, 03:45 PM Go to last post
  43. 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 03:48 PM
    autocorrelation, econometrics
    • Replies: 1
    • Views: 207
    09-10-2014, 08:10 PM Go to last post
  44. 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 12:12 PM
    paired comparisons
    • Replies: 6
    • Views: 238
    09-10-2014, 03:09 PM Go to last post
  45. Weekly Event Probability in a time Range

    Hi All, I am a humble student Engineer/Software Developer that has not touched anything other than BAsic statistics. I have been given the task of...

    Started by JayCain‎, 09-05-2014 02:18 AM
    • Replies: 0
    • Views: 120
    09-05-2014, 02:18 AM Go to last post
  46. Smile MATLAB: Reshape nested structure and export it to Excel - Panel Data - Financial Time

    I am working with a nested structure with multiple fields, each field is a Nx1 vector (cell and double). {Ticker Date Open High Low Close Volume...

    Started by amazon‎, 08-25-2014 07:30 AM
    • Replies: 1
    • Views: 235
    09-04-2014, 11:43 AM Go to last post
  47. chow test in foreign direct investment analysis

    Hi fellows! I'm beginner in statistics so please forgive me in asking stupid questions :) What I'm trying to do is Chow test for Foreign Direct...

    Started by mysje_hood‎, 09-02-2014 03:36 PM
    • Replies: 0
    • Views: 205
    09-02-2014, 03:36 PM Go to last post
  48. Question Which test? - Significance of Sample Size

    Hi all, (First-time poster) I'm working with tagging data for 35 tracked fish. Each fish was tracked of 3 seasons, with detections (3873 overall)...

    Started by MMMCPC‎, 08-29-2014 04:08 PM
    biology, relevance, sample size, significance, test
    • Replies: 5
    • Views: 320
    09-02-2014, 11:21 AM Go to last post
  49. Compare a trial and control

    I want to be able to work out if the results of trials are significant. Assume I have the data for a control and a Trial. The number of samples in...

    Started by Mikezzz‎, 08-13-2014 06:09 AM
    • Replies: 1
    • Views: 223
    09-01-2014, 07:47 AM Go to last post
  50. cox proportional hazard question

    Usually if you have a categorical variable with more than two levels one level is not coded as a dummy (this is the reference level). In regression...

    Started by noetsi‎, 08-28-2014 10:55 AM
    • Replies: 6
    • Views: 247
    08-30-2014, 02:40 AM Go to last post
  51. Pasimonious Model for Neural Networks forecasting, I am really confusing.

    Hello People I recently studied Neural Networks forecasting and some interesting question arose while I am reading various articles on the net. ...

    Started by auto9817‎, 08-27-2014 06:53 AM
    • Replies: 0
    • Views: 190
    08-27-2014, 06:53 AM Go to last post
  52. B2B Sales revenue data and Time Series analysis

    Hello, I am a new member. I have a data set at work that includes quarterly revenue data over 3 consecutive years. Depending upon the product...

    Started by RWORR1‎, 08-25-2014 12:31 PM
    • Replies: 1
    • Views: 196
    08-26-2014, 04:54 AM Go to last post
  53. Sample Size For Marketing

    Lets say I put an ad up on a website and pay some amount every time someone views it. In order to make a profit I need 1/x (x varies so it can be...

    Started by xero007‎, 08-26-2014 12:01 AM
    • Replies: 0
    • Views: 140
    08-26-2014, 12:01 AM Go to last post
  54. Network Probability on a givien server

    There are 100 Clients. A Client will download a file for 30 seconds every 7 minutes (1/14th of the time they are downloading... conversely 13/14th of...

    Started by techsmarty‎, 08-25-2014 06:19 PM
    • Replies: 0
    • Views: 123
    08-25-2014, 06:19 PM Go to last post
  55. Passing from daily pds probability to annual probability

    Hello, I'm stuck on the next conversion or adjustment. I have the following problem, I'm using Weibull observational probability (order/(N+1) on my...

    Started by Jpalbae‎, 08-24-2014 04:56 PM
    annual period, daily, partial_duration_series
    • Replies: 0
    • Views: 122
    08-24-2014, 04:56 PM Go to last post
  56. Which analysis? Measured versus modeled

    Hello, I'm having trouble deciding which type of statistical analysis I should use to compare my modeled data to my measured data and was...

    Started by ddalluge‎, 08-20-2014 10:20 PM
    • Replies: 1
    • Views: 204
    08-23-2014, 04:32 AM Go to last post
  57. Cointegration in Non-linear time series

    I have the following problem: In*non-linear time series regression yt = g(xt)+et, if xt is non-stationary (i.e. I(1)) and yt is stationary (i.e....

    Started by nasazonova‎, 08-20-2014 03:45 PM
    non-linear, time series
    • Replies: 0
    • Views: 186
    08-20-2014, 03:45 PM Go to last post
  58. Treating multiple observations per object

    My data consists of thousands of machine elements, their price, as well as technical and non-technical attributes. Most of the data is categorical ...

    Started by John Dow‎, 08-20-2014 12:25 PM
    correlation, data mining, rattle, regression
    • Replies: 0
    • Views: 122
    08-20-2014, 12:25 PM Go to last post
  59. Non-parametric methods

    A book I am reading now on non-parametrics argues that t test may be still accurate in large sample sizes even if the distribution assumptions are...

    Started by noetsi‎, 07-28-2014 03:10 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 939
    08-19-2014, 09:14 AM Go to last post
  60. Overall Effect of CRM/Marketing programme

    I currently have ...

    Started by MB30‎, 08-18-2014 01:33 PM
    • Replies: 0
    • Views: 145
    08-18-2014, 01:33 PM Go to last post

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