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Forum: Applied Statistics

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

  1. Comment on forecasting versus causal interpretation

    I don't think the mean causality in the classical sense, but simply the slope. I found this comment in an econometric text fascinating and since...

    Started by noetsi‎, 06-30-2016 11:35 AM
    • Replies: 1
    • Views: 1,856
    06-30-2016, 01:42 PM Go to last post
  2. Overall impact of a categorical variable.

    I have a categorical (nominal) variable with 7 levels. I created six dummy variables and can show their slopes in linear regression. But the division...

    Started by noetsi‎, 06-25-2016 02:59 PM
    • Replies: 4
    • Views: 1,545
    06-25-2016, 04:29 PM Go to last post
  3. Corporate Finance - Growth, ratios log transformations

    Hello all, Apologies in advance for the long post, and let me know if im violating any forum rule. Iím trying to expand Erik Staffordís(2015)...

    Started by kikolinner‎, 06-25-2016 08:45 AM
    • Replies: 0
    • Views: 777
    06-25-2016, 08:45 AM Go to last post
  4. differencing and the definition of the dv

    When you difference a series in ARIMA you are changing the definition of the series - something I had not thought of before today. So if for example...

    Started by noetsi‎, 06-23-2016 11:45 AM
    • Replies: 3
    • Views: 2,309
    06-23-2016, 02:57 PM Go to last post
  5. order of MA or AR in ARIMA

    When you speak of a AR or MA 2 are you saying that yt is being influenced by something that occurred at t-2 (two lags ago) or at t-1 and t-2...

    Started by noetsi‎, 06-17-2016 12:45 PM
    • Replies: 4
    • Views: 2,249
    06-22-2016, 03:18 PM Go to last post
  6. Choosing lags for ARDL models

    ARDL models have lags of Y and predictors. However, there rarely is enough theory to chose the correct number of each. Given that one author...

    Started by noetsi‎, 06-21-2016 03:26 PM
    • Replies: 0
    • Views: 3,259
    06-21-2016, 03:26 PM Go to last post
  7. Due-To Analysis in a Multiplicative Function

    Hi Everybody, I have built a linear regression model to explain sales based on different variables (sales, temperature, etc). The model is a...

    Started by ncreixent1‎, 06-21-2016 01:39 PM
    • Replies: 0
    • Views: 1,401
    06-21-2016, 01:39 PM Go to last post
  8. Parameter finding - can you give me a basic guide?

    Hey there, I started working with a detector, and I was asked to model the efficiency of this it. I have collected lots of data about the...

    Started by AdamHunyadi‎, 06-21-2016 05:38 AM
    datasets, parameter estimation, simulation
    • Replies: 2
    • Views: 1,428
    06-21-2016, 09:30 AM Go to last post
  9. forecasting sales

    Suppose I have a car insurance sales data broken down by week. In my case, I have 45 weeks of data. Sales range from 22 to 60 per week. I purposely...

    Started by semidevil‎, 05-26-2016 04:32 PM
    • Replies: 10
    • Views: 2,709
    06-20-2016, 05:12 PM Go to last post
  10. Trend analysis - problem with differing sets of years for financial date

    Hi, I am working with financial data from the American Hospital Association that spans 4 years each for hospitals in the list. I want to do a trend...

    Started by Laide‎, 06-19-2016 01:12 AM
    • Replies: 2
    • Views: 1,287
    06-20-2016, 03:03 AM Go to last post
  11. Learning analytics

    Hi all. I am a newbie to data analysis. I am an online learning facilitator for an online seminar-based program for local high school students. Since...

    Started by protonald‎, 05-23-2016 02:55 AM
    data analysis, learning analytics
    • Replies: 2
    • Views: 1,344
    06-17-2016, 01:43 AM Go to last post
  12. Time series bias

    Its noted that autocorrelation does not bias the slopes just effect the results. But spurious regression tied to non-stationarity/trend where the...

    Started by noetsi‎, 05-28-2016 04:21 PM
    • Replies: 2
    • Views: 1,329
    06-16-2016, 02:24 PM Go to last post
  13. Design Issue?

    I am working with a sample of ~500 people. There are 11 variables of interest. The first 10 (X1-X10) variables are binary and the eleventh (X11) is...

    Started by hlsmith‎, 06-15-2016 02:39 PM
    • Replies: 0
    • Views: 1,275
    06-15-2016, 02:39 PM Go to last post
  14. Types of Non-stationarity

    the literature says you need to know the type of non-Stationarity you are dealing with. How do you do this, how do you know if its trend or...

    Started by noetsi‎, 06-11-2016 03:21 PM
    • Replies: 1
    • Views: 1,557
    06-13-2016, 04:14 PM Go to last post
  15. How do you know when a violation is "mild" as compared to "severe"

    I know there is no simple answer to this and its context driven. I ask this because of this specific quote by an author I am reading .

    Started by noetsi‎, 06-11-2016 02:05 PM
    • Replies: 4
    • Views: 1,669
    06-13-2016, 04:05 PM Go to last post
  16. Chocolate bonbons, sample size and confidence interval

    Hello! I work in a factory where chocolate bonbons are produced (my name is not Charlie). The production of these chocolates is automated. Sometimes...

    Started by enab‎, 06-09-2016 03:32 AM
    • Replies: 5
    • Views: 1,450
    06-09-2016, 02:15 PM Go to last post
  17. durbin-watson value

    I have a linear regression where I am predicting the length of time someone was in a specific status for customers who were active in April 2016....

    Started by noetsi‎, 06-09-2016 12:47 PM
    • Replies: 0
    • Views: 858
    06-09-2016, 12:47 PM Go to last post
  18. Kernel Density Outlier Threshold

    Hi All, First of all, thanks for showing an interest in this thread, and secondly, if your so kind to give your thoughts, I'd be so grateful. ...

    Started by Kearney‎, 06-09-2016 10:28 AM
    kernel, kernel density, probability density, probability function, probability plot
    • Replies: 0
    • Views: 1,612
    06-09-2016, 10:28 AM Go to last post
  19. Multilevel modeling

    Hello everybody, I have a question regarding multilevel modeling. I am building a 3-level model: 1st level yearly observations (variables which...

    Started by ladybird‎, 06-09-2016 08:39 AM
    • Replies: 0
    • Views: 1,472
    06-09-2016, 08:39 AM Go to last post
  20. Question Figuring out the appropriate model for research

    Hello everyone, I have a question conserning the model in my research and I will be really grateful if someone helps me. (sorry if I make mistakes...

    Started by springsae‎, 05-28-2016 06:03 PM
    • Replies: 1
    • Views: 958
    06-09-2016, 12:29 AM Go to last post
  21. Modeling time series in medicine, which method to do

    Hi all, First of all, I'd like to say that I'm quite basic at statistics, so my apologies if my problem description is initially unclear. I'm...

    Started by Nesco‎, 06-08-2016 09:22 AM
    • Replies: 0
    • Views: 2,314
    06-08-2016, 09:22 AM Go to last post
  22. helps with understanding ARIMA concepts

    I've read a few resources on ARIMA, and I still have a few outstanding questions. Here is what I know, and let me know if I am incorrect: Given...

    Started by semidevil‎, 06-07-2016 08:42 PM
    • Replies: 1
    • Views: 1,446
    06-08-2016, 08:34 AM Go to last post
  23. Stationarity

    I don't get the following. What if none of the predictors are non-stationary? http://www.reed.edu/economics/parker/312/tschapters/S13_Ch_4.pdf

    Started by noetsi‎, 06-06-2016 05:16 PM
    • Replies: 3
    • Views: 1,817
    06-07-2016, 11:44 AM Go to last post
  24. Question Perceptual Map using binary outcomes

    I have 10 classes of drugs and within each there are a series of characteristics, e.g., color, aroma, strength and then for each the respondent notes...

    Started by zstatman‎, 06-03-2016 02:48 PM
    correspondence analysis, dimension reduction, mds, perceptual map
    • Replies: 1
    • Views: 1,538
    06-03-2016, 03:06 PM Go to last post
  25. Chow test and structural breaks

    I read this comment in a discussion of structural breaks. It is difficult me to imagine estimating when a break would occur unless you look at...

    Started by noetsi‎, 06-02-2016 01:23 PM
    chow test
    • Replies: 4
    • Views: 1,000
    06-03-2016, 12:51 PM Go to last post
  26. Design of Experiments alternative saught please

    Hello there, New to statistics and put into a project requiring an ability I do not have, yet. There are many independent x variables, one...

    Started by u27sc8‎, 06-03-2016 08:29 AM
    • Replies: 3
    • Views: 1,080
    06-03-2016, 11:04 AM Go to last post
  27. Justification for multilevel modeling

    I used this last 3 years ago (I had a course in it but never utilized it at work). We have customers nested in units, nested in areas, nested in...

    Started by noetsi‎, 05-31-2016 11:05 AM
    • Replies: 5
    • Views: 1,828
    06-03-2016, 11:02 AM Go to last post
  28. How to rank test scores when number of questions answered is different

    I want to rank people based on their test scores but the number of questions each individual has answered is different. People with "n" answers or...

    Started by Velocedge‎, 05-23-2016 07:35 AM
    ranking, score, varying samples
    • Replies: 6
    • Views: 1,568
    06-03-2016, 05:24 AM Go to last post
  29. Choosing an appropriate model for project in marketing

    Hello everyone, I have a question conserning the model in my research and I will be really grateful if someone helps me. (sorry if I make mistakes...

    Started by springsae‎, 05-28-2016 06:08 PM
    • Replies: 1
    • Views: 842
    05-31-2016, 02:15 PM Go to last post
  30. Use of lags to deal with autocorrelation

    This has confused me since I first worked with time series. One solution to dealing with autocorrelation is to specify a lag of Y (I think it is...

    Started by noetsi‎, 05-31-2016 12:37 PM
    • Replies: 1
    • Views: 1,480
    05-31-2016, 01:14 PM Go to last post
  31. Lucrative skill sets

    According to Money magazine number 1 is a SAS programmer (probably because data mining is so hot and SAS seems to dominate that). Third is a data...

    Started by noetsi‎, 05-31-2016 08:30 AM
    • Replies: 0
    • Views: 935
    05-31-2016, 08:30 AM Go to last post
  32. 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: 3,983
    05-31-2016, 08:23 AM Go to last post
  33. Understanding scatter plots / residuals

    In many case you have to analyze scatter plots or residuals for linearity, heteroskedacity etc. My problem is my data typically has thousands of...

    Started by noetsi‎, 05-28-2016 11:43 AM
    • Replies: 3
    • Views: 1,327
    05-28-2016, 05:50 PM Go to last post
  34. Workforce Analytics

    Hi ..I wanted to know which statistical techniques are used in workforce analytics? Thanks in advance

    Started by HazelElle‎, 05-27-2016 09:40 AM
    human resource, people, workforce
    • Replies: 3
    • Views: 1,399
    05-27-2016, 06:13 PM Go to last post
  35. examining odds ratios

    so I have a large data set with odds ratios for identification for services based on different sub groups. For example, an odds ratio for...

    Started by the42up‎, 05-26-2016 11:41 AM
    • Replies: 3
    • Views: 1,246
    05-27-2016, 01:29 PM Go to last post
  36. Pension calculation: can you help deternine if this is methodologically adequate?

    Hi, Thanks for taking to the time to check my post. Since this is a longish post, here is my question in a nutshell (read on for context and...

    Started by JPCM‎, 05-21-2016 11:28 AM
    group and subgroup, pension, set deviation, variation coefficient, weighted average
    • Replies: 0
    • Views: 1,101
    05-21-2016, 11:28 AM Go to last post
  37. 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: 11,789
    05-13-2016, 11:12 AM Go to last post
  38. Creating Fischer Chain

    Hello, I have GDP nominal and real data. The real data varies from certain periods in base year. I'm attempting to chain with a Fischer index. I...

    Started by 7e1cbf8b25‎, 05-12-2016 08:58 PM
    • Replies: 0
    • Views: 1,164
    05-12-2016, 08:58 PM Go to last post
  39. Mills ratio

    How the mills ratio is interpreted??

    Started by Lena‎, 05-12-2016 12:28 PM
    • Replies: 0
    • Views: 1,033
    05-12-2016, 12:28 PM Go to last post
  40. Thumbs up Chi-Square Triangle Beer Test with weird answers...

    I am trying to help develop a test for deciding if two different beer recipes taste statistically different under a blind triangle test. I created an...

    Started by IntusCaliga‎, 05-02-2016 03:55 PM
    binomial test, chi-square test, excel
    • Replies: 11
    • Views: 5,208
    05-08-2016, 11:08 AM Go to last post
  41. Lightbulb Which model to use? Need help identifying appropriate statistical analysis

    Hi All, I need some help in identifying what the best statistical model/approach to take in doing an analysis on sales-out data. I essentially...

    Started by danz23‎, 05-04-2016 08:22 AM
    • Replies: 0
    • Views: 835
    05-04-2016, 08:22 AM Go to last post
  42. Casino betting

    Hi, I'm playing "even money baccarat" where if player wins it pays one to one, banker win it also pay one to one except when banker wins on a 6...

    Started by zoombie‎, 02-14-2014 11:57 AM
    • Replies: 2
    • Views: 2,263
    05-02-2016, 07:18 PM Go to last post
  43. Developing expected outcomes - chi squared?

    Hi all. I have a question as follows to answer: "The data covers the type of bean mix supplied to external outlets in January and December of...

    Started by twilliams‎, 05-02-2016 05:17 AM
    • Replies: 0
    • Views: 2,097
    05-02-2016, 05:17 AM Go to last post
  44. 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: 3,068
    05-01-2016, 11:31 AM Go to last post
  45. Weekly Survey Sample impacted by low sample rates

    Dear all, I hope you can help as I am at the limit of what I know regarding this! We survey a sample of our customers each week for customer...

    Started by Engineer1‎, 04-29-2016 07:13 AM
    • Replies: 0
    • Views: 1,312
    04-29-2016, 07:13 AM Go to last post
  46. Confidence in data set

    Hi I am currently looking at some data and I am trying to draw conclusions from it but I am not confident that conclusions can be drawn due to the...

    Started by Winterphoenix‎, 04-28-2016 03:26 AM
    • Replies: 6
    • Views: 1,231
    04-29-2016, 06:57 AM Go to last post
  47. Determining the order of AR

    When you are doing time series regression determining the correct AR error is important. I was wondering if either or both of these work. Run...

    Started by noetsi‎, 04-27-2016 03:52 PM
    • Replies: 1
    • Views: 1,135
    04-28-2016, 03:25 AM Go to last post
  48. Fuzzy logic systems and fuzzy rules definition

    Hello, I'm new in fuzzy logic modeling. I'm using the package "sets" in R. Starting form a database of crisps variables of 8 input varialbes and 1...

    Started by MorMick‎, 04-27-2016 08:15 AM
    • Replies: 0
    • Views: 993
    04-27-2016, 08:15 AM Go to last post
  49. Does this mean what I think it means

    :shakehead Getting old I have data which shows gains in wages. Say getting OJT shows $36 and not getting it shows $27. I have calculated the...

    Started by noetsi‎, 04-23-2016 02:30 PM
    • Replies: 8
    • Views: 1,343
    04-25-2016, 09:50 AM Go to last post
  50. Help with errors in a research

    Hi all, I am new to this forum and I am really glad that I found it. Hope I'll be able to offer some help as well. My problem is fairly simple,...

    Started by Nirg‎, 04-25-2016 05:00 AM
    research for thesis, sample, standarddeviation
    • Replies: 0
    • Views: 1,414
    04-25-2016, 05:00 AM Go to last post
  51. Geometric Mean and SD Problem: Modelling future growth

    Hello I am trying to model future growth of an investment using only past performance data. I have historical investment values (actually a...

    Started by superfro123‎, 04-24-2016 05:12 PM
    • Replies: 0
    • Views: 1,327
    04-24-2016, 05:12 PM Go to last post
  52. Finance Event Study - Event Induced Volatility

    Normally, in an stock price event study, we assume that the daily variance in the estimation period is the same as that during the event window. ...

    Started by ctm‎, 04-20-2016 06:56 PM
    event study
    • Replies: 0
    • Views: 1,420
    04-20-2016, 06:56 PM Go to last post
  53. What is the best way to determine the convergence of data?

    I'm doing some research with Matlab (materials science related), and a lot of my work involves statistical analysis, of which I'm not super familiar...

    Started by trcritchfield‎, 04-16-2016 05:26 PM
    • Replies: 3
    • Views: 1,537
    04-20-2016, 05:01 PM Go to last post
  54. Net income variability in relation to profit margin

    I've been working with a data set of company financial information over the past decade. I am particularly interested in how and if the profit margin...

    Started by Exorcist‎, 04-20-2016 04:14 PM
    net income variation, profit
    • Replies: 0
    • Views: 1,001
    04-20-2016, 04:14 PM Go to last post
  55. Analysis of nonnormal distributions for mobile gaming.

    Hello, all! I'm a newly minted UX Researcher at a mobile gaming company. I say "newly minted" because I've been in academia until very recently....

    Started by SamuraiUX‎, 04-18-2016 07:02 PM
    • Replies: 3
    • Views: 1,391
    04-19-2016, 03:35 PM Go to last post
  56. Looking for causes of a factor, statistical control

    I ran a regression with a series of statistical controls. Say education and time in service are the controls and what I really want to know is...

    Started by noetsi‎, 04-19-2016 08:08 AM
    • Replies: 0
    • Views: 1,216
    04-19-2016, 08:08 AM Go to last post
  57. To bootstrap or to not bootstrap

    I am thinking about whether or not I should derive bootstrap estimates from an analysis I am working on. A bit of background- I am examining...

    Started by the42up‎, 04-17-2016 08:16 PM
    • Replies: 0
    • Views: 1,522
    04-17-2016, 08:16 PM Go to last post
  58. American equivalent of Natrional Centre for Research Methods

    That is an excellent site, but where I work all foreign sites are blocked and I was hoping to find a US equivalent of it. It does a lot of work on...

    Started by noetsi‎, 04-15-2016 01:01 PM
    • Replies: 0
    • Views: 1,172
    04-15-2016, 01:01 PM Go to last post
  59. Standard Deviation Help for 5-year Investing term

    Hi, I'm trying to build a detailed expectation profile for a compounded five-year investment. It averages a 40% return per year with a 60% standard...

    Started by sports‎, 04-14-2016 03:51 AM
    • Replies: 0
    • Views: 1,485
    04-14-2016, 03:51 AM Go to last post
  60. Physical interpretation of an AR(n) series

    Hi, I am learning TS analysis but my angle is probably diffent from the usual. Being in six sigma I need to reduce the variability of a process that...

    Started by rogojel‎, 04-06-2016 12:08 PM
    autoregressive, interpretation, time series
    • Replies: 11
    • Views: 1,628
    04-13-2016, 07:24 AM Go to last post

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