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Forum: Applied Statistics

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

  1. Log transformation of means

    Hey! I'm working on a meta-analysis and I want to use the means for moderator analysis. So some journal articles report log transformed values of...

    Started by Feal‎, Today 01:55 PM
    log, log transformation
    • Replies: 1
    • Views: 49
    Today, 04:36 PM Go to last post
  2. Instrumental variables

    Instrumental variables must not be correlated with the error term. How can you test if they are? The only way I can think of is testing their...

    Started by noetsi‎, 07-12-2016 08:25 AM
    • Replies: 6
    • Views: 327
    07-25-2016, 01:14 PM Go to last post
  3. significance of the difference between two values

    Hello all, I'm working on a skew-normal distribution and would like to know if the difference between 2 values of the data set is significant. ...

    Started by nbenic23‎, 07-19-2016 04:17 AM
    • Replies: 0
    • Views: 209
    07-19-2016, 04:17 AM Go to last post
  4. Classification System based on Statistical tests

    Hello and Thanks I am looking at financial data (Revenue for Example) over a 5 year time frame and want to classify the data based on trends...

    Started by Stockcalc‎, 07-17-2016 04:58 PM
    classification, financial data, linear regression
    • Replies: 0
    • Views: 147
    07-17-2016, 04:58 PM Go to last post
  5. SDC Platinum Database

    Hello everyone, Currently I'm doing research on whether implementation of open innovation in high technology industries makes a firm more crisis...

    Started by Benelo‎, 07-12-2016 09:11 AM
    • Replies: 1
    • Views: 79
    07-12-2016, 09:34 AM Go to last post
  6. Aggregate versus individual data

    As context for this we are working on creating models that predict economic factors such as increased income as result of being in our programs....

    Started by noetsi‎, 07-11-2016 11:34 AM
    • Replies: 2
    • Views: 99
    07-11-2016, 05:23 PM Go to last post
  7. What does this regulation mean?

    I would appreciate comments on this new federal regulation. I have no idea what they mean (no other context is provided). The only...

    Started by noetsi‎, 07-11-2016 10:49 AM
    • Replies: 3
    • Views: 87
    07-11-2016, 01:46 PM Go to last post
  8. ANOVA for three different time periods

    I have three different time periods of sales data of 4 weeks apiece: weeks 1-4, 5-8, and 9-12. During weeks, 9-12 we attempted a test that may...

    Started by clovisjim‎, 07-08-2016 07:53 AM
    anova, anova observations, mean difference
    • Replies: 4
    • Views: 238
    07-08-2016, 09:11 AM Go to last post
  9. Statistical test for algorithm performance

    I am developing different algorithms for a class of optimization problems. I have several problem instances in this class (some from real...

    Started by stor‎, 07-08-2016 06:24 AM
    experiment design, hypothesis testing, statistical test
    • Replies: 0
    • Views: 92
    07-08-2016, 06:24 AM Go to last post
  10. eQualityCoin- What type of model is this?

    Hi everyone, I've been working on developing a crypto-currency called eQualityCoin for a while now and hoped someone here might be able to help me...

    Started by MPrestonSparks‎, 06-29-2016 11:40 AM
    • Replies: 1
    • Views: 294
    07-01-2016, 05:12 PM Go to last post
  11. Is a paired two sample for means t- test OK?

    I am performing some method validation and need to compare results but am unsure which t-test to use. I am thinking paired would be OK but would...

    Started by sporotite‎, 07-01-2016 04:54 AM
    • Replies: 1
    • Views: 147
    07-01-2016, 10:44 AM Go to last post
  12. Formula for prioritization

    Hey guys, I hope you are all doing well. I have a quick question related to an applied research I need to make for my job. Basically, we have a...

    Started by celeronhater‎, 07-01-2016 08:16 AM
    average, formula, task, weight, work
    • Replies: 0
    • Views: 87
    07-01-2016, 08:16 AM Go to last post
  13. 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: 141
    06-30-2016, 01:42 PM Go to last post
  14. 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: 278
    06-25-2016, 04:29 PM Go to last post
  15. 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. I’m trying to expand Erik Stafford’s(2015)...

    Started by kikolinner‎, 06-25-2016 08:45 AM
    • Replies: 0
    • Views: 109
    06-25-2016, 08:45 AM Go to last post
  16. 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: 217
    06-23-2016, 02:57 PM Go to last post
  17. 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: 282
    06-22-2016, 03:18 PM Go to last post
  18. 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: 140
    06-21-2016, 03:26 PM Go to last post
  19. 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: 98
    06-21-2016, 01:39 PM Go to last post
  20. 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: 139
    06-21-2016, 09:30 AM Go to last post
  21. 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: 670
    06-20-2016, 05:12 PM Go to last post
  22. 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: 176
    06-20-2016, 03:03 AM Go to last post
  23. 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: 244
    06-17-2016, 01:43 AM Go to last post
  24. 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: 196
    06-16-2016, 02:24 PM Go to last post
  25. 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: 134
    06-15-2016, 02:39 PM Go to last post
  26. 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: 231
    06-13-2016, 04:14 PM Go to last post
  27. 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: 251
    06-13-2016, 04:05 PM Go to last post
  28. 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: 290
    06-09-2016, 02:15 PM Go to last post
  29. 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: 109
    06-09-2016, 12:47 PM Go to last post
  30. 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: 119
    06-09-2016, 10:28 AM Go to last post
  31. 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: 134
    06-09-2016, 08:39 AM Go to last post
  32. 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: 92
    06-09-2016, 12:29 AM Go to last post
  33. 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: 206
    06-08-2016, 09:22 AM Go to last post
  34. 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: 189
    06-08-2016, 08:34 AM Go to last post
  35. 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: 183
    06-07-2016, 11:44 AM Go to last post
  36. 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: 180
    06-03-2016, 03:06 PM Go to last post
  37. 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: 237
    06-03-2016, 12:51 PM Go to last post
  38. 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: 150
    06-03-2016, 11:04 AM Go to last post
  39. 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: 315
    06-03-2016, 11:02 AM Go to last post
  40. 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: 334
    06-03-2016, 05:24 AM Go to last post
  41. 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: 114
    05-31-2016, 02:15 PM Go to last post
  42. 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: 119
    05-31-2016, 01:14 PM Go to last post
  43. 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: 126
    05-31-2016, 08:30 AM Go to last post
  44. 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: 415
    05-31-2016, 08:23 AM Go to last post
  45. 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: 167
    05-28-2016, 05:50 PM Go to last post
  46. 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: 231
    05-27-2016, 06:13 PM Go to last post
  47. 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: 161
    05-27-2016, 01:29 PM Go to last post
  48. 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: 158
    05-21-2016, 11:28 AM Go to last post
  49. 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: 55
    • Views: 1,523
    05-13-2016, 11:12 AM Go to last post
  50. 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: 121
    05-12-2016, 08:58 PM Go to last post
  51. Mills ratio

    How the mills ratio is interpreted??

    Started by Lena‎, 05-12-2016 12:28 PM
    • Replies: 0
    • Views: 108
    05-12-2016, 12:28 PM Go to last post
  52. 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: 817
    05-08-2016, 11:08 AM Go to last post
  53. 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: 142
    05-04-2016, 08:22 AM Go to last post
  54. 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 10:57 AM
    • Replies: 2
    • Views: 796
    05-02-2016, 07:18 PM Go to last post
  55. 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: 196
    05-02-2016, 05:17 AM Go to last post
  56. 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: 571
    05-01-2016, 11:31 AM Go to last post
  57. 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: 155
    04-29-2016, 07:13 AM Go to last post
  58. 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: 273
    04-29-2016, 06:57 AM Go to last post
  59. 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: 206
    04-28-2016, 03:25 AM Go to last post
  60. 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: 171
    04-27-2016, 08:15 AM Go to last post

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