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Forum: Applied Statistics

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

  1. 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
    chi square?, data distribution
    • Replies: 2
    • Views: 93
    Yesterday, 05:31 AM Go to last post
  2. 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: 2
    • Views: 173
    08-20-2016, 12:07 PM Go to last post
  3. 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: 200
    08-15-2016, 07:36 AM Go to last post
  4. 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: 199
    08-10-2016, 06:33 PM Go to last post
  5. 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: 188
    08-08-2016, 09:20 PM Go to last post
  6. 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: 184
    08-07-2016, 02:08 AM Go to last post
  7. 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: 185
    08-06-2016, 04:50 PM Go to last post
  8. 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: 116
    08-04-2016, 01:12 AM Go to last post
  9. 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: 232
    08-03-2016, 06:11 AM Go to last post
  10. 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
    econometrics
    • Replies: 0
    • Views: 117
    08-02-2016, 06:35 PM Go to last post
  11. 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
    econometrics
    • Replies: 2
    • Views: 116
    08-02-2016, 06:26 PM Go to last post
  12. 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: 165
    07-29-2016, 04:36 PM Go to last post
  13. 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: 464
    07-25-2016, 01:14 PM Go to last post
  14. 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: 271
    07-19-2016, 04:17 AM Go to last post
  15. 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: 198
    07-17-2016, 04:58 PM Go to last post
  16. 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: 108
    07-12-2016, 09:34 AM Go to last post
  17. 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: 137
    07-11-2016, 05:23 PM Go to last post
  18. 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: 124
    07-11-2016, 01:46 PM Go to last post
  19. 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: 300
    07-08-2016, 09:11 AM Go to last post
  20. 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: 122
    07-08-2016, 06:24 AM Go to last post
  21. 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: 354
    07-01-2016, 05:12 PM Go to last post
  22. 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: 174
    07-01-2016, 10:44 AM Go to last post
  23. 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: 122
    07-01-2016, 08:16 AM Go to last post
  24. 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: 172
    06-30-2016, 01:42 PM Go to last post
  25. 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: 326
    06-25-2016, 04:29 PM Go to last post
  26. 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: 138
    06-25-2016, 08:45 AM Go to last post
  27. 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: 259
    06-23-2016, 02:57 PM Go to last post
  28. 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: 328
    06-22-2016, 03:18 PM Go to last post
  29. 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: 168
    06-21-2016, 03:26 PM Go to last post
  30. 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: 130
    06-21-2016, 01:39 PM Go to last post
  31. 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: 173
    06-21-2016, 09:30 AM Go to last post
  32. 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: 737
    06-20-2016, 05:12 PM Go to last post
  33. 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: 210
    06-20-2016, 03:03 AM Go to last post
  34. 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: 274
    06-17-2016, 01:43 AM Go to last post
  35. 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: 228
    06-16-2016, 02:24 PM Go to last post
  36. 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: 159
    06-15-2016, 02:39 PM Go to last post
  37. 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: 264
    06-13-2016, 04:14 PM Go to last post
  38. 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: 282
    06-13-2016, 04:05 PM Go to last post
  39. 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: 331
    06-09-2016, 02:15 PM Go to last post
  40. 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: 140
    06-09-2016, 12:47 PM Go to last post
  41. 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: 145
    06-09-2016, 10:28 AM Go to last post
  42. 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: 157
    06-09-2016, 08:39 AM Go to last post
  43. 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: 117
    06-09-2016, 12:29 AM Go to last post
  44. 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: 236
    06-08-2016, 09:22 AM Go to last post
  45. 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: 216
    06-08-2016, 08:34 AM Go to last post
  46. 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: 231
    06-07-2016, 11:44 AM Go to last post
  47. 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: 211
    06-03-2016, 03:06 PM Go to last post
  48. 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: 273
    06-03-2016, 12:51 PM Go to last post
  49. 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: 186
    06-03-2016, 11:04 AM Go to last post
  50. 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: 354
    06-03-2016, 11:02 AM Go to last post
  51. 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: 376
    06-03-2016, 05:24 AM Go to last post
  52. 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: 137
    05-31-2016, 02:15 PM Go to last post
  53. 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: 145
    05-31-2016, 01:14 PM Go to last post
  54. 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: 152
    05-31-2016, 08:30 AM Go to last post
  55. 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: 504
    05-31-2016, 08:23 AM Go to last post
  56. 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: 202
    05-28-2016, 05:50 PM Go to last post
  57. 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: 306
    05-27-2016, 06:13 PM Go to last post
  58. 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: 201
    05-27-2016, 01:29 PM Go to last post
  59. 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: 184
    05-21-2016, 11:28 AM Go to last post
  60. 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: 1,723
    05-13-2016, 11:12 AM Go to last post

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