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Forum: Applied Statistics

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

  1. How to correlate groups of cases unified by non-numeric variables?

    Hi. I am struggling to correlate "nations" of respondents in a multi-country study, and I can't figure out what the best way is, in SPSS or in any...

    Started by cgrozev‎, 08-20-2013 08:27 AM
    alphanumeric correlation, correlation, spss
    • Replies: 0
    • Views: 1,738
    08-20-2013, 08:27 AM Go to last post
  2. Testing the difference of difference of means

    Hi all, I've spent some time googling this and just can't uncover an answer, so I apologize in advance if it's obvious and was staring me in the...

    Started by learningcurve‎, 08-17-2013 12:43 PM
    • Replies: 6
    • Views: 2,218
    08-17-2013, 05:35 PM Go to last post
  3. Repeated measures ANOVA for an experiment with missing values (unbalaced)

    I have an experiment where several subjects (subjects={S1,S2,..Sm})were asked to perform a set of tasks (tasks={T1, T2, T3, ..Tn}) using both their...

    Started by siva82kb‎, 08-17-2013 03:58 PM
    repeated measure anova, unbalanced data
    • Replies: 0
    • Views: 2,300
    08-17-2013, 03:58 PM Go to last post
  4. Analyses on waiting times

    Dear all, I'm working on a survey conducted among customers of an accounting firm with different branches. Among many others, there was a...

    Started by ian‎, 08-06-2013 08:49 AM
    • Replies: 3
    • Views: 2,043
    08-15-2013, 11:59 AM Go to last post
  5. Correcting Forecast Errors Short Term

    Hello, I am working with a linear exponential smoothing model that utilizes historical seasonality to forecast future demand in our distribution...

    Started by mattkunkle‎, 08-14-2013 08:12 AM
    • Replies: 3
    • Views: 1,947
    08-14-2013, 03:06 PM Go to last post
  6. Pricing Joint Life Insurance under Dependent Assumption

    Hi, I am currently trying to understand a dissertation on Pricing Joint Life Insurance under Dependent...

    Started by ankc‎, 08-08-2013 01:25 PM
    • Replies: 0
    • Views: 2,026
    08-08-2013, 01:25 PM Go to last post
  7. Best Practices for Handling Skewed Data?

    Hi everyone! I'm currently working on cleaning various inputs to perform a multiple linear regression. I have no experience in applied...

    Started by Oberon‎, 08-07-2013 11:50 AM
    • Replies: 3
    • Views: 11,497
    08-08-2013, 09:23 AM Go to last post
  8. Real world measurement at the limits of the measuring device

    Hi everyone. I'm *not* a statisticion by any means, but I want to, if reasonable to do so, apply control chart methods to help solve a real world...

    Started by Ryder‎, 08-05-2013 06:54 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 4,924
    08-08-2013, 07:42 AM Go to last post
  9. Accuracy of a measurement device

    Good afternoon, I am working with a device that measures the internal dimensions of a piece. The device takes 27 different measurements, each one...

    Started by guilhermecruz‎, 08-02-2013 02:43 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,093
    08-07-2013, 07:45 PM Go to last post
  10. Bimodal data, and human behavior

    Hi again everyone... Speaking, again, as a total amature with respect to statistics, I have some concerns about applying statistical methods to...

    Started by Ryder‎, 08-06-2013 12:07 PM
    • Replies: 0
    • Views: 1,933
    08-06-2013, 12:07 PM Go to last post
  11. Breusch-Godfrey test

    I am somewhat unclear on this test of autocorrelation (AC). 1) Does this test for moving averages as well as autoregressive ones? 2) Is there a...

    Started by noetsi‎, 07-30-2013 01:25 PM
    • Replies: 1
    • Views: 7,708
    08-03-2013, 10:29 AM Go to last post
  12. random sampling of unequal size structures

    Hi, I had a student come to me for help on his thesis in materials engineering. He is interested in studying the distribution of pore sizes in a...

    Started by Eugenie‎, 08-01-2013 04:20 AM
    sampling design
    • Replies: 5
    • Views: 2,429
    08-02-2013, 01:54 PM Go to last post
  13. Estimating returns per year by scaling them using the returns of an index

    Dear geniuses, I'm doing research on some return series covering different periods. My data consists of transactions and I can thus calculate the...

    Started by thuurvdop‎, 08-01-2013 03:57 AM
    finance, index, return data, return period
    • Replies: 1
    • Views: 1,460
    08-01-2013, 07:57 AM Go to last post
  14. Time Series Problem

    Hello all, I need your advice regarding time series. I have received a couple of time series. One series includes some land measures, the...

    Started by NN_STAT‎, 08-01-2013 05:46 AM
    • Replies: 0
    • Views: 1,628
    08-01-2013, 05:46 AM Go to last post
  15. Exponetial smoothing

    Holt Winters deals with seasonality and a trend. But what if you have seasonality, but no trend? I can't find any exponential smoothing model that...

    Started by noetsi‎, 07-31-2013 01:05 PM
    • Replies: 4
    • Views: 2,384
    07-31-2013, 06:31 PM Go to last post
  16. Testing if pre- and post-treatment time series are not significantly different

    Hello, I have 3 time series corresponding to independent pretreatment experiments and 3 time series corresponding to independent post treatment...

    Started by genesup‎, 07-27-2013 07:36 AM
    • Replies: 0
    • Views: 2,011
    07-27-2013, 07:36 AM Go to last post
  17. Prediction interval of generalized linear model

    I am trying to do predictions using a generalized linear model, and my model has a gamma distribution for the response variable and a reciprocal link...

    Started by Rekize‎, 07-26-2013 01:10 PM
    generalized linear model, prediction interval
    • Replies: 0
    • Views: 1,722
    07-26-2013, 01:10 PM Go to last post
  18. Probability that a load may exceed capacity

    In engineering, typically we design structures to withstand a certain load. Given that there are uncertainties in both, we apply a factor of safety...

    Started by ElaB‎, 07-25-2013 05:45 PM
    load vs. capacity, overlapping distribution, probability overlap
    • Replies: 2
    • Views: 2,006
    07-26-2013, 05:31 AM Go to last post
  19. Help determining appropriate test for research project

    Hello everyone, I am seeking advice on which statistical test would be appropriate for my research project. Despite taking several graduate...

    Started by jennamarie128‎, 07-25-2013 10:40 AM
    • Replies: 0
    • Views: 1,843
    07-25-2013, 10:40 AM Go to last post
  20. Excel and regression

    Another reason to question the use of excel to run regression. http://otexts.com/fpp/5/7/

    Started by noetsi‎, 07-25-2013 10:40 AM
    • Replies: 0
    • Views: 1,614
    07-25-2013, 10:40 AM Go to last post
  21. Basic time series question

    If you want to predict one time series with another what is the simplest way to do this?

    Started by noetsi‎, 07-24-2013 10:03 AM
    • Replies: 6
    • Views: 1,710
    07-24-2013, 03:12 PM Go to last post
  22. What kind of T-test for this example

    Hello, I have 3 algorithms (A,B,C) which predict "author name" of each text article. I have tested all the algorithms on 3 different corpora...

    Started by rahat‎, 07-24-2013 10:14 AM
    • Replies: 1
    • Views: 1,645
    07-24-2013, 12:22 PM Go to last post
  23. Comparing Correlation Coefficients

    I currently work in the field of imaging. My question is in regards to comparing correlation coefficients. I have two image sets (which have an...

    Started by jdin‎, 07-22-2013 10:45 AM
    correlation, correlation analysis, correlation coefficients, imaging, steiger
    • Replies: 0
    • Views: 1,421
    07-22-2013, 10:45 AM Go to last post
  24. Design-based variance estimators and autocorrelation

    I am analyzing a national survey using a difference-in-differences design with one age group as the treatment group and an older age group as the...

    Started by subharimc‎, 07-22-2013 07:22 AM
    • Replies: 0
    • Views: 1,887
    07-22-2013, 07:22 AM Go to last post
  25. Small distance variability

    Hello everyone. I'm doing research on small distance variability between exploration wells. I have all databases, f.e. gamma-ray in every 10 cm...

    Started by Albek‎, 07-22-2013 03:27 AM
    correlating, statistical research, t-test, variability
    • Replies: 0
    • Views: 1,261
    07-22-2013, 03:27 AM Go to last post
  26. Should I use ANOVA or a different test?

    Hello, I have grade data from 9 courses in 3 different faculties, and each student is classified as someone with minimal tutoring experience,...

    Started by S-C-3-1-3‎, 04-27-2013 10:51 AM
    • Replies: 12
    • Views: 2,488
    07-20-2013, 07:00 AM Go to last post
  27. Simple description of what alpha means

    I am trying to generate a simple explanation for an audience with essentially zero statistical background, what a alpha level in a statistical test...

    Started by noetsi‎, 07-18-2013 09:37 AM
    • Replies: 7
    • Views: 1,840
    07-18-2013, 03:25 PM Go to last post
  28. one-way repeated measurements ANOVA

    Dear all, I am new to this forum and fairly unexperienced when it comes to statistics. Maybe you could help me with a problem that I have...

    Started by Henri‎, 07-18-2013 08:25 AM
    anova, repeated measurements
    • Replies: 0
    • Views: 1,461
    07-18-2013, 08:25 AM Go to last post
  29. behavioural economics experiment - non parametric repeated measures manova

    hi there, I wonder if sbdy could help me with my dissertation project. I am stuck with the analysis n tried to consult a few people but unfortunately...

    Started by Kuba‎, 07-16-2013 06:18 PM
    economics, environment, non-normal distribution, non-parametric, repeated measures manova
    • Replies: 1
    • Views: 2,827
    07-16-2013, 06:44 PM Go to last post
  30. Simple time series methods

    I have played around with time series for a long time. Now I have to actually use them quickly. I would deeply appreciate suggestions for the...

    Started by noetsi‎, 07-11-2013 12:59 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,624
    07-15-2013, 12:11 PM Go to last post
  31. ANOVA for Deterministic Response!

    Hello everyone, This might be an easy/trivial question, but it is confusing me a bit. I did a factorial experiment, in which I had two factors,...

    Started by amegahed3‎, 06-27-2013 08:30 AM
    • Replies: 7
    • Views: 2,820
    07-15-2013, 03:30 AM Go to last post
  32. Dynamic common factor residual zero error

    Hi, I run the dynamic factor modelling and try to predict the unobserved factors under Postestimation>prediction,residuals... however, the values...

    Started by nazmul.hossain‎, 07-15-2013 02:04 AM
    • Replies: 0
    • Views: 985
    07-15-2013, 02:04 AM Go to last post
  33. Throwing out zeros from a faulty sensor

    I'm fairly new at stats. I have time-series data from a sensor. There are a lot of zeros in the data -- 70% of readings -- and those seem...

    Started by pteehan‎, 04-23-2013 10:11 PM
    outliers, zeros
    • Replies: 4
    • Views: 2,693
    07-12-2013, 06:38 PM Go to last post
  34. Statistics for economics

    Hi guys, Is there anyone who is willing to help me with the questions below? I'd really appreciate any help you can give me. The graphs are...

    Started by very_stuck‎, 07-01-2013 08:28 AM
    • Replies: 5
    • Views: 2,560
    07-12-2013, 06:21 PM Go to last post
  35. A criterion for rejecting errors in air monitoring data

    Hello everybody, I have a set of air monitoring data from some dozens of monitoring stations. The measurements were for 7 air pollutants, every 5...

    Started by David2012‎, 11-15-2012 09:35 AM
    • Replies: 2
    • Views: 1,965
    07-12-2013, 09:00 AM Go to last post
  36. Uncertainty analysis of wind data

    Hello I want to determine the uncertainty of wind data time series via excel. It was recorded with ten minutes intervals as average and...

    Started by dby082‎, 02-05-2013 11:32 AM
    • Replies: 5
    • Views: 2,519
    07-12-2013, 08:41 AM Go to last post
  37. Determine how big of a sample size you need

    Hi, I'm trying to work out a problem about poker but i think i can just as well explain it using a coin. If you would flip a coin and want to...

    Started by badeend‎, 05-31-2013 10:36 AM
    • Replies: 2
    • Views: 2,582
    07-10-2013, 08:22 AM Go to last post
  38. Estimating failure rate

    Hi all, I need some assistance in guiding folks on a sampling problem. We have an application that performs transactions and we're in the process...

    Started by schwartzaw‎, 07-09-2013 02:31 PM
    failure rate, negative binomial
    • Replies: 0
    • Views: 2,090
    07-09-2013, 02:31 PM Go to last post
  39. one million new (mac) jobs!

    Is there an analysis of the new jobs we hear about by hourly pay? That's so we have an idea of the quality and so we don't get fooled by the govt.

    Started by deric‎, 07-05-2013 08:50 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 5,074
    07-08-2013, 01:53 PM Go to last post
  40. Stata 11.0 - Type mismatch r(109) byte to strin variable

    Hello there, I just started working with Stata (Version 11.0). The search in the FAQ and on other pages showed no results so I am trying it here. ...

    Started by CaptainMcRocket‎, 07-08-2013 08:10 AM
    byte, help me!, r(109), stata, string
    • Replies: 0
    • Views: 5,723
    07-08-2013, 08:10 AM Go to last post
  41. Good Resources for understanding Time Series Analysis

    Hi All, I am new to time series analyst community. Basically I am an IT capacity planner and need to understand the concepts of Time series...

    Started by Nrjbhatia‎, 02-15-2011 03:49 AM
    forecasting, time series
    • Replies: 2
    • Views: 7,165
    07-08-2013, 07:41 AM Go to last post
  42. Plackett-Burman designs

    Hi, I plan to run several designed experiments in a chemical industrial setting, where they have relatively large numbers of parameters (between 20...

    Started by rogojel‎, 07-05-2013 03:22 AM
    • Replies: 4
    • Views: 3,182
    07-05-2013, 01:53 PM Go to last post
  43. Comparing three datasets and two variables at the same time?

    I am puzzling lately with a statistics problem... I know a little bit of statistics, but definitely not an expert... :-) So the thing is...

    Started by spoilerman‎, 07-05-2013 10:21 AM
    • Replies: 0
    • Views: 1,594
    07-05-2013, 10:21 AM Go to last post
  44. Poll Poll: Forecasting Methodology Check

    Question I was wondering if a few people might be able to review a proposed forecasting methodology and provide commentary. Background We have...

    Started by nreithma‎, 07-02-2013 11:28 AM
    • Replies: 0
    • Views: 1,238
    07-02-2013, 11:28 AM Go to last post
  45. Confirmation that thesis survey is statistically sound.

    Hey all. I been reading a bit on this forum, and people seem very helpful. I therefore also ask your help. I'm currently writing my thesis in...

    Started by ecopa‎, 06-28-2013 03:55 AM
    • Replies: 4
    • Views: 4,441
    07-01-2013, 10:47 AM Go to last post
  46. Time Series Analysis: Variable # of Observations

    Greetings! This is my first post to the forum. Thank you all in advance for considering my question. When performing a time series analysis,...

    Started by havik23‎, 06-17-2013 09:15 PM
    • Replies: 1
    • Views: 2,381
    06-28-2013, 09:52 PM Go to last post
  47. statistical approach for the analysis of measurements taken from deformed metal pipe

    New member here. I have attempted to search for previous threads applicable to my situation, by my ignorance of statistics is such that I am having...

    Started by Ricyteach‎, 06-21-2013 11:42 PM
    • Replies: 11
    • Views: 2,631
    06-23-2013, 01:57 PM Go to last post
  48. Calculating for Future Currency (AUD/USD)

    Hi all, Can anyone help me with the following question using the attached images from cme? (a) the future prices of purchasing an Australian...

    Started by CLMY92‎, 06-22-2013 07:03 AM
    • Replies: 0
    • Views: 2,092
    06-22-2013, 07:03 AM Go to last post
  49. Alpha and confidence intervals in business and other applied statistics

    As we all know, alpha is often set at 0.05 in science. This is mostly convention, but it's rather conservative since we'd rather slowly accumulate...

    Started by Junes‎, 06-20-2013 09:32 PM
    • Replies: 0
    • Views: 1,683
    06-20-2013, 09:32 PM Go to last post
  50. When are standard errors reasonable?

    Obviously you want your model to be as efficient as possible and thus SE as small as possible. But at what point are standard errors acceptable (as...

    Started by noetsi‎, 06-04-2013 08:24 AM
    standard errors
    • Replies: 8
    • Views: 4,348
    06-18-2013, 11:14 AM Go to last post
  51. Is a signed-rank test appropriate here? [econ/finance]

    Hi, Suppose I have a very large set of stocks. I select 100 of them, calculate a return. This calculation is very complex (not just buy and hold)...

    Started by badmax‎, 06-15-2013 02:44 PM
    • Replies: 1
    • Views: 1,778
    06-15-2013, 07:35 PM Go to last post
  52. Fixed effects versus standard errors

    I have experimental data from a correspondence test in the rental housing market. On which ground should I choose between: 1) F.E. for the region...

    Started by lukeskywalker84‎, 06-13-2013 12:57 PM
    clustering, experiment, fixed-effects
    • Replies: 0
    • Views: 1,450
    06-13-2013, 12:57 PM Go to last post
  53. Sampling a hemisphere using an arbitary distribtuion

    I am writing a ray tracer and I wish to fire rays from a point **p** into a hemisphere above that point according to some distribution. 1) I have...

    Started by Bodes‎, 06-13-2013 03:11 AM
    monte carlo, monte-carlo, random numbers, sampling
    • Replies: 0
    • Views: 2,619
    06-13-2013, 03:11 AM Go to last post
  54. Two sets of time-series data. What type of test?

    As the title suggests, my goal is to compare two sets of time-series data. This is the scenario: -Two air samplers are measuring for...

    Started by raycock‎, 06-12-2013 11:28 AM
    • Replies: 3
    • Views: 10,329
    06-12-2013, 11:13 PM Go to last post
  55. AIC in time series

    I consider these comments in a well known text very confusing given what I thought was true with AIC. They are comparing two time series models. ...

    Started by noetsi‎, 06-12-2013 02:17 PM
    • Replies: 0
    • Views: 3,626
    06-12-2013, 02:17 PM Go to last post
  56. Independence test for multidimensional data sets

    Hi I had a 6 dimensional (non parametric independent variables) data set, each case representing day of my study period. I performed clustering...

    Started by mzalikhan‎, 05-26-2013 04:24 AM
    independence test, multidimensional data, non-parameteric
    • Replies: 1
    • Views: 1,603
    06-12-2013, 12:11 AM Go to last post
  57. Question Rating and Votes for hotels - how to connect?

    Hello everyone, I have collected data on hotels, and I want to run some regressions on it. One problem appeared: I have average rating for each...

    Started by Artem‎, 06-06-2013 07:14 AM
    regression, regression assumption
    • Replies: 1
    • Views: 1,865
    06-11-2013, 08:48 AM Go to last post
  58. Physical Sub-Sampling in the Oil Industry

    Greetings All. Newbie here with absolutely no experience with Applied Statistics and a real-world question. I have a 6 inch oil/water pipeline that...

    Started by MarkHill‎, 05-24-2013 01:02 PM
    2 Pages
    1 2
    calibration, sub-sampling
    • Replies: 15
    • Views: 3,441
    06-10-2013, 10:25 AM Go to last post
  59. AMMI algorythm

    Hi, Does anyone has experience using AMMI (additive main effects and multiplicative interactions)? If yes, could you please provide practical...

    Started by szm‎, 06-09-2013 01:12 PM
    additive, interaction effects, multivariate analysis
    • Replies: 0
    • Views: 1,654
    06-09-2013, 01:12 PM Go to last post
  60. Question Statistical Condensing

    I am a beginner when it comes to statistical data processing. When generating statistics from several application produces unrelated data points...

    Started by Buglish‎, 06-05-2013 04:30 PM
    • Replies: 4
    • Views: 1,653
    06-05-2013, 05:18 PM Go to last post

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