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Forum: Applied Statistics

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

  1. missing data/multiple imputations

    They often talk about whether the mechanism that generates missing data is"ignorable." I don't really know what this means in practice. Also how do...

    Started by noetsi‎, 03-12-2015 01:40 PM
    8 Pages
    1 2 3 ... 8
    • Replies: 114
    • Views: 17,603
    09-30-2015, 01:09 PM Go to last post
  2. Logit v. Probit: A fight to the death

    Every now and then I have to work with binary responses with continuous covariates. So of course this screams generalized linear model. The...

    Started by Dason‎, 09-13-2011 09:59 PM
    5 Pages
    1 2 3 ... 5
    logit, probit
    • Replies: 67
    • Views: 38,640
    04-08-2015, 12:47 PM Go to last post
  3. Control chart for spending over time.

    I am running a control chart for spending over time (there are about 80 data points, one per month for the last 80 months). Is there one type of...

    Started by noetsi‎, 05-05-2016 09:19 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 54
    • Views: 11,900
    05-13-2016, 11:12 AM Go to last post
  4. 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: 11,500
    10-05-2014, 09:24 PM Go to last post
  5. Determanistic vs Stochastic trend

    Trends may be either determanistic or stochastic in nature and assuming one is the other causes both forecasting and other errors. The trick is...

    Started by noetsi‎, 10-18-2013 05:38 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 10,451
    12-03-2013, 12:12 PM Go to last post
  6. Binary Logistic Regression: general issue and question about model fit

    Hello Guys, I would appreciate to have some feedback on an issue I am faced with. Thank you in advance for the time you will possibly spend in...

    Started by gianmarco‎, 07-10-2014 07:28 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 9,590
    07-21-2014, 12:33 PM Go to last post
  7. Multilevel analysis

    This is a thread on the wonderful world of multilevel analysis which is called many different things by various authors. This is the type of...

    Started by noetsi‎, 05-01-2017 11:08 AM
    3 Pages
    1 2 3
    • Replies: 44
    • Views: 5,353
    09-05-2017, 01:11 PM Go to last post
  8. What do statistical tests really do

    The background. We generated customer to counselor ratios for our counties (these are population data not a survey. That is we queried all our...

    Started by noetsi‎, 03-02-2017 03:27 PM
    3 Pages
    1 2 3
    • Replies: 43
    • Views: 11,877
    04-01-2017, 11:50 PM Go to last post
  9. Joint outliers - what is this really?

    We analyze the impact of cost and duration (time in service) outliers. I tried to improve the analysis two years ago by looking at outliers on both...

    Started by noetsi‎, 11-02-2015 04:09 PM
    3 Pages
    1 2 3
    • Replies: 41
    • Views: 7,788
    01-12-2016, 02:44 PM Go to last post
  10. First "big data" (not so big) project... lots of missing data!

    Hello! So, as I’ve shared before here in the forum my boss switched me from the project I was working on to my first “big data” problem. I’m adding...

    Started by spunky‎, 01-08-2016 02:01 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 3,313
    02-18-2016, 05:47 PM Go to last post
  11. Simulations

    I mean this to be a general thread on simulation but will start with a specific point. The following I know is a trivial example, CI are well...

    Started by noetsi‎, 01-05-2015 02:10 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 8,816
    01-09-2015, 03:36 PM Go to last post
  12. 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: 5,076
    08-19-2014, 09:14 AM Go to last post
  13. Missing data in regression

    I have an entire population. One of the variable is missing about 12 percent of the data. I believe this is because we have no finished collecting...

    Started by noetsi‎, 09-27-2016 02:55 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 8,871
    10-05-2016, 08:57 AM Go to last post
  14. An average of standard deviations?

    Hello, My apologies if this isn't the correct forum for this, but I'm trying to analyze some data and can't figure out how to obtain an accurate...

    Started by indoze‎, 11-05-2010 08:53 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 211,596
    02-23-2017, 10:18 AM Go to last post
  15. Best Practice Time Series Analysis

    Hello, I have got a general question. Should trend models like y(t)= b(0)+ b(1)*t y(t)= b(0)+ b(1)*t+ b(2)* t^2 y(t)= b(0)* exp in case...

    Started by consuli‎, 03-15-2015 11:05 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 5,686
    05-18-2015, 11:16 AM Go to last post
  16. Monte Carlo simulations

    I am not using this to test the results of violations of statistical assumptions or the like. I am using it to analyze business issues for which no...

    Started by noetsi‎, 02-10-2017 04:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,400
    02-22-2017, 03:15 PM Go to last post
  17. What is Hierarchial Linear Regression used for?

    This is associated with multilvel analysis. I am considering taking a course considered doctoral in this in the spring and I was hoping to get a...

    Started by noetsi‎, 11-14-2011 08:36 PM
    2 Pages
    1 2
    • Replies: 23
    • Views: 6,273
    11-18-2011, 01:48 PM Go to last post
  18. Question Help with decision tree when continuous data

    Hello, I have a dataset (y = true/false, x's = combination of binary and continuous data columns, n = 5000) that I am attempting to create a...

    Started by JRadcliffe‎, 02-18-2014 05:43 PM
    2 Pages
    1 2
    continuous, data, decision, tree
    • Replies: 22
    • Views: 4,844
    02-24-2014, 10:55 PM Go to last post
  19. White standard errors

    Some call these heteroscedastic consistent standard errors. There were some indications that my model was heteroscedastic :( Certainly my data is...

    Started by noetsi‎, 03-09-2016 04:41 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 3,567
    03-10-2016, 06:48 PM Go to last post
  20. 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: 5,063
    07-08-2013, 01:53 PM Go to last post
  21. Bayes?

    Hi All, My question is: Where to go with Bayes?

    Started by asangari‎, 12-05-2011 07:04 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 6,626
    12-05-2011, 06:45 PM Go to last post
  22. Stats Problem

    On average, there are three misprints in every 10 pages of a particular book. If every chappter of the book contains 35 pages, what is the...

    Started by gijin‎, 05-03-2012 12:00 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,634
    05-03-2012, 01:45 AM Go to last post
  23. 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: 5,793
    10-10-2014, 01:09 AM Go to last post
  24. Forecasting bus mileage - what is the best way

    We are trying to figure out when the engines on a specific bus will hit the mileage as designated per engine. I m having the darndest time trying to...

    Started by lehi52‎, 06-26-2014 03:55 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,105
    07-21-2014, 02:29 PM Go to last post
  25. 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: 3,578
    10-01-2014, 04:41 PM Go to last post
  26. Population and P values

    I have been told that if you have the entire population of interest than the P values and test of significance really are meaningless . They say...

    Started by noetsi‎, 03-09-2016 03:52 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,367
    03-14-2016, 05:26 PM Go to last post
  27. [GARCH model] Why do we need a "mean equation" ?

    Hi, :) As i said in my first topic, I'm a beginner in financial statistics. I read a lot of things about GARCH, but I didn't find a precise...

    Started by Latiole‎, 08-12-2012 10:00 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 18,651
    03-03-2016, 09:11 AM Go to last post
  28. 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: 4,918
    08-08-2013, 07:42 AM Go to last post
  29. Arma (2,2) - pacf

    Dear Statisticians, i have a huge request.this week i will have to present a task which i consider as pretty difficult so solve. Hopefully some...

    Started by yooo‎, 05-27-2014 03:17 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 4,858
    05-29-2014, 11:48 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: 5,791
    09-26-2014, 03:41 PM Go to last post
  31. Control Chart - Which one to use - IMR or CUSUM

    Hi, I have a thesis study about statistical quality control. I have data from a chemical factory manufacturing powder paint. They want to use...

    Started by burcu‎, 05-28-2016 05:33 AM
    2 Pages
    1 2
    cusum, imr, quality, statistical control
    • Replies: 17
    • Views: 4,023
    05-31-2016, 08:23 AM Go to last post
  32. Transporting LASSO Model Results to Logistic Reg for Estimates

    I have a dataset which will be entirely made up of binary variables (i.e., ~25 IVs, 1 DV). Variables will likely be correlated. N=~300. -I was...

    Started by hlsmith‎, 06-15-2017 12:30 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 1,105
    06-28-2017, 02:31 PM Go to last post
  33. Time series questions

    Eventually a ecometrician will wonder by:yup: Ostrom suggests a measure of model value. You divide the RMSE of your forcast, by the RMSE of...

    Started by noetsi‎, 08-06-2013 01:00 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,819
    10-11-2013, 03:01 PM Go to last post
  34. Two many outliers for Tukey boxplot?

    I calculated Tukey extreme outliers (in this case only for outliers at the top of the distribution). The calculation is upper quartile +(3*IQR). I...

    Started by noetsi‎, 11-10-2015 12:13 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,586
    11-19-2015, 05:22 PM Go to last post
  35. Time Series and the CLT

    Unfortunately I no longer have the book this is based on. I was wondering why exactly this is the case . Personally I don't think most analyst...

    Started by noetsi‎, 04-26-2016 04:01 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,087
    05-01-2016, 11:31 AM Go to last post
  36. Comparing nonsignificant means

    It seems like I see the following pattern occasionally in research papers. The author will report results for statistical tests and not be able to...

    Started by suobs‎, 08-10-2011 08:14 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,579
    08-24-2011, 04:14 PM Go to last post
  37. 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: 3,436
    06-10-2013, 10:25 AM Go to last post
  38. European Social Survey -- income variable

    If you have worked with the ESS and are familiar with the vagaries of the income variable, perhaps you can help me identify a solution to a specific...

    Started by dbartram‎, 06-20-2013 10:45 AM
    2 Pages
    1 2
    ess
    • Replies: 15
    • Views: 10,861
    01-16-2015, 07:43 AM Go to last post
  39. 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: 4,618
    07-15-2013, 12:11 PM Go to last post
  40. 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: 5,080
    08-07-2013, 07:45 PM Go to last post
  41. [help] cobb douglas function

    The following is an estimate of a Cobb Douglas production function. Output=34.87 +0.98 Labour +0.87Capital + 2.76 month R-sq=0.86 F=79.98 ...

    Started by numerospy‎, 11-09-2013 09:51 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,939
    11-17-2013, 11:51 PM Go to last post
  42. Assumptions of time series

    I believe, but am not certain, that time series methods which employ regression assume normality and equal error variance. Would you test for these...

    Started by noetsi‎, 10-31-2013 10:27 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 9,223
    12-03-2013, 12:25 PM Go to last post
  43. Getting same value (.000) of Sig. (or 'p') in Shapiro-Wilk Normality test

    Greetings to fellow talk stat members, I'm facing an issue with significance (or 'p') value in Shapiro-Wilk Normality test. Even after performing...

    Started by pankaj12‎, 02-20-2014 07:25 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 16,145
    02-25-2014, 08:32 AM Go to last post
  44. Methods section- can I use the term inferential statistics if I dont have a sample

    I am writing a report and need to write a very brief method section. I basically describe my sample (frequencies), some cross tabulations, and see...

    Started by Marvin85‎, 04-06-2015 04:42 PM
    2 Pages
    1 2
    inferential, methods
    • Replies: 15
    • Views: 3,194
    04-14-2015, 04:10 PM Go to last post
  45. What method is this?

    This comes from a slide, it is all the information I have. They say they ran this: Traditional Ordinary Least Squares (OLS) methods. Fixed...

    Started by noetsi‎, 02-02-2016 03:31 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,985
    02-04-2016, 04:55 PM Go to last post
  46. comment on research design.

    I have been asked to create a research design. The goal is to evaluate a new way of serving customers, an intervention to do so, with a series of...

    Started by noetsi‎, 10-31-2017 05:34 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 347
    11-04-2017, 11:26 PM Go to last post
  47. 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: 2,908
    11-21-2014, 01:05 PM Go to last post
  48. Outlier Analysis

    Since I circled back to this topic I thought I would start a thread on it :) I tend to think of statistics as some form of pure math where things...

    Started by noetsi‎, 01-19-2016 11:08 AM
    • Replies: 14
    • Views: 2,144
    01-25-2016, 12:54 PM Go to last post
  49. Question Normal distribution of sample or population?

    Hello, for using parametric tests, is it required that the sample data are normally distributed or is it sufficient to know from other similar...

    Started by Biochemist‎, 11-09-2017 01:03 PM
    • Replies: 14
    • Views: 342
    11-11-2017, 09:44 AM Go to last post
  50. ANOVA and post-hoc analysis

    Hello there!!!! I'm struggling once again with statistics. This time I wonder if someone can advise me. I run a taste panel panel with (14...

    Started by ARI‎, 02-24-2011 11:30 AM
    • Replies: 13
    • Views: 17,784
    03-16-2011, 07:26 PM Go to last post
  51. Decomposing total variance of profits into variance from loss and variance from gain

    Hello, Consider the profit stream of a firm. This profit stream consists of losses and gains. Suppose that I am interested in investigating the...

    Started by BigBugBuzzz‎, 11-09-2011 04:56 PM
    decomposing, variance, variance decomposition
    • Replies: 13
    • Views: 4,963
    11-11-2011, 03:39 PM Go to last post
  52. VAR model

    Hi , i need a help :) i conducted a VAR model using e-view program after choosing the suitable lag length i re estimate the VAR ,so i got ...

    Started by Elie‎, 06-11-2012 03:31 PM
    • Replies: 13
    • Views: 3,477
    06-13-2012, 02:28 PM Go to last post
  53. Time series

    Hello! Can someone help me with this: Y=X^2+Z, X,Z~N(0,1), independent equally distributed. How can I find projection od Y on span{1,X,Z}?

    Started by mboricgs‎, 11-18-2013 12:42 PM
    • Replies: 13
    • Views: 2,535
    11-19-2013, 09:43 AM Go to last post
  54. Outlier identification scatter plot

    I am looking for points who's combination of values for the two variables in the scatterplot are extreme. I know you can find points graphically...

    Started by noetsi‎, 02-18-2014 11:55 AM
    • Replies: 13
    • Views: 2,507
    02-19-2014, 08:33 AM Go to last post
  55. After model selection: Estimated parameters are not reliable

    Hello, I have conducted an experiment which manipulated three factors (Factor 1: 3 levels, Factor 2: 2 levels, Factor 3: 2 levels). The response...

    Started by Scarlatti‎, 07-20-2014 06:27 PM
    • Replies: 13
    • Views: 2,407
    07-28-2014, 03:06 AM Go to last post
  56. Multivariate test suggestions

    Hi, thanks for taking the time to read this. I hope I am posting this in the correct forum. I have soil chemistry data from 5 different areas,...

    Started by hgold‎, 01-15-2015 03:39 PM
    • Replies: 13
    • Views: 2,505
    01-21-2015, 12:27 PM Go to last post
  57. SEM and normality

    Been a while since I worked with SEM. This puzzled me as I thought multivariate normality, the normality of the residuals was what mattered in...

    Started by noetsi‎, 03-30-2015 11:48 AM
    • Replies: 13
    • Views: 3,706
    03-31-2015, 08:11 AM Go to last post
  58. I need Help from Statisticians

    Hi everyone, I have problem and need a solution from statisticians, I'm from Iraq, working in the water municipality, I have 150 water tank to...

    Started by lionking‎, 02-20-2016 04:08 AM
    • Replies: 13
    • Views: 2,174
    02-21-2016, 07:44 AM Go to last post
  59. Question examine whether data sets come from the same ditribution

    hi, i want to check whether the two data sets can be drawn from the same distribution. can i do it with chi-square test? what are the assumptions i...

    Started by hagit‎, 08-23-2016 05:47 AM
    • Replies: 13
    • Views: 2,564
    08-27-2016, 02:03 PM Go to last post
  60. Time Series thread

    Many multivariate time series require variables to be integrated of the same order . My question is what do you do if variables are not integrated of...

    Started by noetsi‎, 12-16-2016 11:55 AM
    • Replies: 13
    • Views: 5,919
    01-04-2017, 01:15 AM Go to last post

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