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Forum: Applied Statistics

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

  1. Exclamation Causality test

    Do you know what is the "Hafner and Herwartz" causality-in-variance test, or else called LM-GARCH? And how you run it on eviews (or gretl)? If...

    Started by jamesb‎, 09-23-2016 02:32 PM
    causality, garch, granger, variance testing
    • Replies: 0
    • Views: 102
    09-23-2016, 02:32 PM Go to last post
  2. Question Engineering research tests: comparing post hoc data and paring

    Hello - I have several tests to do but my stats is a bit rusty... They are all based on the deflection of different beam designs: Test 1 Beam...

    Started by jarvis‎, 09-21-2016 11:18 AM
    anova, engineering, post-hoc, practical, research
    • Replies: 0
    • Views: 108
    09-21-2016, 11:18 AM Go to last post
  3. Help with non parametric analysis

    Hi, I'm about to write my master thesis and have some issues with analyzing my data. I have plants with different treatments and their...

    Started by dummy22‎, 09-10-2016 08:36 AM
    • Replies: 1
    • Views: 259
    09-10-2016, 10:58 AM Go to last post
  4. What statistical analysis (ordinal/nominal data)?

    Hi. I'm seriously super frightened by statistics but as a PhD student, I guess it's time to learn... I have data from a survey comparing three...

    Started by xfie‎, 09-07-2016 08:56 AM
    • Replies: 2
    • Views: 201
    09-08-2016, 07:21 PM Go to last post
  5. Please help! :)

    This is the same scenario as the monte carlo simulation question. Wind speed and temperature determine the number of seats sold for a flight. I'm...

    Started by Juliana‎, 09-07-2016 04:26 PM
    • Replies: 0
    • Views: 114
    09-07-2016, 04:26 PM Go to last post
  6. Simple average question

    This might be the most basic math question ever asked here :( I want to calculate a year to date (not monthly) average of cases per counselor. I...

    Started by noetsi‎, 09-06-2016 01:29 PM
    • Replies: 1
    • Views: 107
    09-06-2016, 04:01 PM Go to last post
  7. Red face Monte Carlo simulation

    Hi :) I'm currently doing a third year university stats course. I need help with some questions. The question gives Wind speed and Temperature...

    Started by Juliana‎, 09-03-2016 11:54 AM
    correlated simulation, monte carlo
    • Replies: 4
    • Views: 298
    09-04-2016, 12:03 PM Go to last post
  8. 2+ measures for one outcome possible?

    Hey guys, I am currently designing a study which aims to investigate the effect of a treatment on several outcomes. Since some of the outcomes are...

    Started by floriisco‎, 09-02-2016 03:09 AM
    • Replies: 0
    • Views: 125
    09-02-2016, 03:09 AM Go to last post
  9. Statistical Analysis of Student Test Scores before and after an Intervention

    Hello, Please help me ensure that I am conducting the proper statistical analysis. I am trying to determine if my student test score results are...

    Started by billturner3‎, 08-19-2016 04:03 PM
    education, statistics, t-test
    • Replies: 3
    • Views: 326
    08-31-2016, 08:58 PM Go to last post
  10. looking at how income fluctuations and instability affect spending in certain areas

    Hi, I am trying to figure out how to examine how the magnitude of a spike in funding affects spending in certain sectors. For example, an...

    Started by the42up‎, 08-31-2016 09:36 AM
    • Replies: 0
    • Views: 96
    08-31-2016, 09:36 AM Go to last post
  11. 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: 444
    08-27-2016, 02:03 PM Go to last post
  12. Seek for Statistical Test of Variability Contribution Percentage of Multiple Factors

    Hi, I need statistical test which would tell me which percent of variability in dependent variable is from given independent set of variables and...

    Started by Alexei Nomazov‎, 08-14-2016 10:07 AM
    anova, factor analysis, statistical methods, statistical test, variability
    • Replies: 3
    • Views: 237
    08-15-2016, 07:36 AM Go to last post
  13. Can you help me use statistics to understand inventory at my company??

    Hey everyone, I work for an industrial materials warehouse that stocks and sells probably 10,000 discreet items. Iím trying to figure out a way to...

    Started by skiermike‎, 08-10-2016 10:12 AM
    • Replies: 1
    • Views: 244
    08-10-2016, 06:33 PM Go to last post
  14. Regression and seasonality

    I am running a multiple linear regression analysis to show how different demand factors affect demand of juice. My independent variables are price,...

    Started by statsgirl123‎, 08-08-2016 12:11 PM
    demand, forecasting, regression, seasonality
    • Replies: 4
    • Views: 276
    08-08-2016, 09:20 PM Go to last post
  15. Weighted moving averages

    I would like to learn about what I think are called weighted moving averages for some software I am working on. I need a way to estimate the...

    Started by Jennifer Murphy‎, 08-05-2016 03:10 PM
    • Replies: 2
    • Views: 253
    08-07-2016, 02:08 AM Go to last post
  16. Comparing Mean and Median

    Hi, This is my first post here so I am sorry if this question seems a little basic or I have put it in the wrong section of the forum. I was...

    Started by mc123‎, 08-06-2016 10:38 AM
    • Replies: 3
    • Views: 223
    08-06-2016, 04:50 PM Go to last post
  17. Time Series Problems

    Hello all, I need your advice regarding analysis I wish to perform. I have time series data, of a rate of some virtual stock. The time interval is...

    Started by Yankel‎, 08-04-2016 01:12 AM
    • Replies: 0
    • Views: 146
    08-04-2016, 01:12 AM Go to last post
  18. What ANOVA fits best?

    Dear all, can anyone please advice me which ANOVA is the most suitable: An athlete has perfromed multiple runs at constant speed with three...

    Started by Jurij‎, 08-02-2016 10:49 AM
    matlab, repeated measures anova, unbalanced data
    • Replies: 6
    • Views: 282
    08-03-2016, 06:11 AM Go to last post
  19. Breusch-Godfrey

    I am using the Breusch-Godfrey for autocorrelation, but I dont know how many lags should I use? I am testing seasonality of funds returns with...

    Started by DuarteR‎, 08-02-2016 06:35 PM
    • Replies: 0
    • Views: 153
    08-02-2016, 06:35 PM Go to last post
  20. Newey West autocorrelation

    May I use Newey West procedures when exists only autocorrelation? or I just can use Newey West when exists both autocorrelation and...

    Started by DuarteR‎, 08-02-2016 11:45 AM
    • Replies: 2
    • Views: 137
    08-02-2016, 06:26 PM Go to last post
  21. 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, 07-29-2016 01:55 PM
    log, log transformation
    • Replies: 1
    • Views: 199
    07-29-2016, 04:36 PM Go to last post
  22. 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: 550
    07-25-2016, 01:14 PM Go to last post
  23. 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: 310
    07-19-2016, 04:17 AM Go to last post
  24. 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: 225
    07-17-2016, 04:58 PM Go to last post
  25. 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: 136
    07-12-2016, 09:34 AM Go to last post
  26. 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: 153
    07-11-2016, 05:23 PM Go to last post
  27. 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: 156
    07-11-2016, 01:46 PM Go to last post
  28. 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: 328
    07-08-2016, 09:11 AM Go to last post
  29. 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: 154
    07-08-2016, 06:24 AM Go to last post
  30. 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: 385
    07-01-2016, 05:12 PM Go to last post
  31. 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: 199
    07-01-2016, 10:44 AM Go to last post
  32. 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: 152
    07-01-2016, 08:16 AM Go to last post
  33. 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: 198
    06-30-2016, 01:42 PM Go to last post
  34. 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: 364
    06-25-2016, 04:29 PM Go to last post
  35. 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: 160
    06-25-2016, 08:45 AM Go to last post
  36. 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: 283
    06-23-2016, 02:57 PM Go to last post
  37. 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: 355
    06-22-2016, 03:18 PM Go to last post
  38. 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: 189
    06-21-2016, 03:26 PM Go to last post
  39. 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: 150
    06-21-2016, 01:39 PM Go to last post
  40. 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: 196
    06-21-2016, 09:30 AM Go to last post
  41. 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: 775
    06-20-2016, 05:12 PM Go to last post
  42. 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: 233
    06-20-2016, 03:03 AM Go to last post
  43. 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: 293
    06-17-2016, 01:43 AM Go to last post
  44. 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: 245
    06-16-2016, 02:24 PM Go to last post
  45. 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: 173
    06-15-2016, 02:39 PM Go to last post
  46. 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: 282
    06-13-2016, 04:14 PM Go to last post
  47. 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: 304
    06-13-2016, 04:05 PM Go to last post
  48. 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: 361
    06-09-2016, 02:15 PM Go to last post
  49. 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: 156
    06-09-2016, 12:47 PM Go to last post
  50. 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: 159
    06-09-2016, 10:28 AM Go to last post
  51. 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: 176
    06-09-2016, 08:39 AM Go to last post
  52. 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: 133
    06-09-2016, 12:29 AM Go to last post
  53. 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: 264
    06-08-2016, 09:22 AM Go to last post
  54. 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: 242
    06-08-2016, 08:34 AM Go to last post
  55. 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: 256
    06-07-2016, 11:44 AM Go to last post
  56. 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: 229
    06-03-2016, 03:06 PM Go to last post
  57. 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: 289
    06-03-2016, 12:51 PM Go to last post
  58. 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: 205
    06-03-2016, 11:04 AM Go to last post
  59. 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: 381
    06-03-2016, 11:02 AM Go to last post
  60. 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: 412
    06-03-2016, 05:24 AM Go to last post

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