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Forum: Applied Statistics

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

  1. 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, Yesterday 07:35 AM
    ranking, score, varying samples
    • Replies: 0
    • Views: 50
    Yesterday, 07:35 AM Go to last post
  2. 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, Yesterday 02:55 AM
    data analysis, learning analytics
    • Replies: 0
    • Views: 40
    Yesterday, 02:55 AM Go to last post
  3. 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: 59
    05-21-2016, 11:28 AM Go to last post
  4. 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: 1,160
    05-13-2016, 11:12 AM Go to last post
  5. 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: 57
    05-12-2016, 08:58 PM Go to last post
  6. Mills ratio

    How the mills ratio is interpreted??

    Started by Lena‎, 05-12-2016 12:28 PM
    • Replies: 0
    • Views: 58
    05-12-2016, 12:28 PM Go to last post
  7. 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: 440
    05-08-2016, 11:08 AM Go to last post
  8. 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: 97
    05-04-2016, 08:22 AM Go to last post
  9. 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: 729
    05-02-2016, 07:18 PM Go to last post
  10. 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: 127
    05-02-2016, 05:17 AM Go to last post
  11. 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: 424
    05-01-2016, 11:31 AM Go to last post
  12. 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: 93
    04-29-2016, 07:13 AM Go to last post
  13. 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: 187
    04-29-2016, 06:57 AM Go to last post
  14. 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: 136
    04-28-2016, 03:25 AM Go to last post
  15. 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: 93
    04-27-2016, 08:15 AM Go to last post
  16. 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: 311
    04-25-2016, 09:50 AM Go to last post
  17. 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: 94
    04-25-2016, 05:00 AM Go to last post
  18. 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: 122
    04-24-2016, 05:12 PM Go to last post
  19. 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: 225
    04-20-2016, 06:56 PM Go to last post
  20. 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: 253
    04-20-2016, 05:01 PM Go to last post
  21. 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: 109
    04-20-2016, 04:14 PM Go to last post
  22. 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: 217
    04-19-2016, 03:35 PM Go to last post
  23. 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: 108
    04-19-2016, 08:08 AM Go to last post
  24. 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: 150
    04-17-2016, 08:16 PM Go to last post
  25. 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: 139
    04-15-2016, 01:01 PM Go to last post
  26. 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: 168
    04-14-2016, 03:51 AM Go to last post
  27. 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: 388
    04-13-2016, 07:24 AM Go to last post
  28. Identifying which population the sample comes from

    Hello There, I have items that each have unique distribution. There are hundred items and they all have their own unique distributions based on...

    Started by mike121‎, 03-31-2016 11:05 PM
    • Replies: 4
    • Views: 506
    04-08-2016, 09:53 PM Go to last post
  29. Finite mixture bivariate probit model

    Hello, all, I would like to model my data using a bivariate probit model but would like to explain unobserved heterogeneity of the coefficients in...

    Started by lucymark2013‎, 04-07-2016 10:22 PM
    bivariate probit, econometrics, finite mixture, r software, sas
    • Replies: 0
    • Views: 158
    04-07-2016, 10:22 PM Go to last post
  30. Analysis of data with weights

    I am conducting regression on data from a sample that used a stratified rather than simple random sampling. I know the regression is done differently...

    Started by noetsi‎, 04-06-2016 01:11 PM
    • Replies: 3
    • Views: 190
    04-07-2016, 04:06 PM Go to last post
  31. Satisfaction analysis

    We carry out a satisfaction analysis every few years asking about various dimensions of satisfaction such as pay. We are starting a new one. I get to...

    Started by noetsi‎, 03-31-2016 11:15 AM
    • Replies: 7
    • Views: 300
    04-01-2016, 08:45 AM Go to last post
  32. Smile Clinical Trial - sample size for statistically comparable data?

    Hi Everyone In a nutshell - I am looking to undertake an 8 week clinical trial of an equine veterinary health product. I am wanting to analyse...

    Started by WildlifeStats‎, 03-29-2016 05:27 AM
    clinical trial, sample size, sample size calculation, sample size determination
    • Replies: 8
    • Views: 362
    03-31-2016, 06:12 AM Go to last post
  33. Pass / fail

    I need to use an analytical technique (pass/fail) to identify the stems (about 50/100 days each) that arrives in stock. The instrument is not...

    Started by crimelist‎, 03-25-2016 05:25 AM
    • Replies: 0
    • Views: 431
    03-25-2016, 05:25 AM Go to last post
  34. ChiSquare tests with very large sample size

    Hi all, I have a dataset from a retailer with over 1 million observations and over 100 variables. The outcome variable has 2 levels (Purchase/Not...

    Started by aiteebee‎, 03-24-2016 05:31 AM
    • Replies: 6
    • Views: 395
    03-25-2016, 04:02 AM Go to last post
  35. Sample Size Needed for Performance Measurement?

    We have a call center where each representative is audited for a certain number of calls each month. Of course, reps with fewer audits exhibit higher...

    Started by stryder‎, 03-23-2016 08:03 PM
    • Replies: 1
    • Views: 194
    03-23-2016, 08:18 PM Go to last post
  36. Smile Errors In Variables (EIV) Correction

    Hi! I'm currently doing a Fama-Macbeth regression, and have read about correction for EIV. I have found several ways to do it, but I simply do not...

    Started by StudentCBS‎, 03-23-2016 09:19 AM
    • Replies: 2
    • Views: 172
    03-23-2016, 08:03 PM Go to last post
  37. Measure Impact Unification Ticketprice

    Hey everybody, I need to measure the impact of the unification of the price of public transport in metropolitan area on employment. One of my...

    Started by leonid.fouche‎, 03-20-2016 08:34 AM
    • Replies: 12
    • Views: 476
    03-21-2016, 04:24 PM Go to last post
  38. What do you do if you know there are problems with your studies

    Those who read my post know I worry about this a lot....:p What do you do if you know there are limits on your study, be that methods used, design...

    Started by noetsi‎, 03-21-2016 11:38 AM
    • Replies: 3
    • Views: 171
    03-21-2016, 12:34 PM Go to last post
  39. What you do if you know there are limiting factors in your study

    For example I remain concerned about two significant issues in my existing project. I have autocorrelation according to Durbin Watson and outliers...

    Started by noetsi‎, 03-19-2016 04:30 PM
    • Replies: 2
    • Views: 173
    03-19-2016, 04:59 PM Go to last post
  40. Determining outliers

    Dear folks, I am interested in statistics but I never had a course in college and I've had to learn a few basic things myself. This time, I am...

    Started by Moemanofnj‎, 09-10-2015 09:34 AM
    • Replies: 9
    • Views: 949
    03-17-2016, 11:17 AM Go to last post
  41. Need help with simple statistics

    Im a new poster. There is the airplane engine. It is known to fail once every 100,000 hours. How often is it likely to fail in 1 hour? Use one...

    Started by coloradobluesky‎, 03-15-2016 12:20 PM
    • Replies: 9
    • Views: 390
    03-16-2016, 12:29 PM Go to last post
  42. Back transforming a transformed regression

    Today, before I decided it made little sense, I was trying to transform data to address non-normality. One of the things that occurred to me is that...

    Started by noetsi‎, 03-15-2016 05:07 PM
    • Replies: 1
    • Views: 152
    03-15-2016, 05:10 PM Go to last post
  43. Non-parametric method with 14 predictors

    None of the non-parametrics I have explored deal with large numbers of predictors . Its possible they will handle many and simply never address this....

    Started by noetsi‎, 03-15-2016 11:55 AM
    • Replies: 2
    • Views: 157
    03-15-2016, 01:22 PM Go to last post
  44. 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 02:52 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 625
    03-14-2016, 05:26 PM Go to last post
  45. Fama-Machbeth Cross Sectional Regression vs. Panel Data Regression - Which to chose?

    Hi, I'm writing my thesis about Ethical Investing, and want to look at the return of different companies that have gotten an ESG rating. The data...

    Started by StudentCBS‎, 03-14-2016 03:28 AM
    • Replies: 0
    • Views: 134
    03-14-2016, 03:28 AM Go to last post
  46. Custom Scatter Plot

    I am open to using R here, if one of you can figure this out or get close. I have run a proc glm model (Outcome = continuous with two continous...

    Started by hlsmith‎, 03-10-2016 10:54 AM
    • Replies: 8
    • Views: 363
    03-11-2016, 01:02 PM Go to last post
  47. 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 03:41 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 530
    03-10-2016, 05:48 PM Go to last post
  48. How to measure the impact of a subject on student performance?

    Hi, I need to find the impact of mathematics on student performance. I have only the student exam marks for mathematics and all the other...

    Started by Nanayakkara‎, 03-08-2016 03:46 AM
    canonical correlation, multivariate analysis, regression, statistical approach
    • Replies: 3
    • Views: 325
    03-10-2016, 01:04 PM Go to last post
  49. Hypothesis Testing - Obtaining T-Stats and Critical T-Values

    Dear all, I have been given the following question I don't really understand how to interpret this question. Commonly, hypothesis questions...

    Started by UniApply‎, 03-04-2016 04:25 AM
    • Replies: 3
    • Views: 367
    03-04-2016, 11:25 AM Go to last post
  50. [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: 8,414
    03-03-2016, 08:11 AM Go to last post
  51. Is this methodologically unsound or violate an assumption?

    I don't think so, because I don't think changing the scale this way matters in terms of methods. But I have been wrong before... I have the change...

    Started by noetsi‎, 02-27-2016 12:43 PM
    • Replies: 3
    • Views: 328
    02-27-2016, 04:20 PM Go to last post
  52. How to de-seasonlize data

    I have a couple of questions regarding de seasonalizing data. 1. I have application counts for an insurance company from 2013 through 2015. The...

    Started by semidevil‎, 02-25-2016 05:07 PM
    • Replies: 0
    • Views: 236
    02-25-2016, 05:07 PM Go to last post
  53. Cycle time reduction conversion to labor savings

    I work in a distribution environment and cycle time reduction has become our primary improvement initiative. We currently use a very simple formula...

    Started by Bdoyel‎, 02-24-2016 08:21 PM
    • Replies: 1
    • Views: 259
    02-25-2016, 01:38 AM Go to last post
  54. 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 03:08 AM
    • Replies: 13
    • Views: 624
    02-21-2016, 06:44 AM Go to last post
  55. Bernoulli Trials

    x represents the number of defectives, and we assume that the process procedures 25% defectives. The P(NDN) represents the probability of getting 1...

    Started by asilvester635‎, 02-20-2016 07:38 PM
    • Replies: 2
    • Views: 299
    02-20-2016, 08:08 PM Go to last post
  56. Separating out impact of changes in community, experience, and age.

    It is common to look at changes in income over time. But those impacts could model maturity of the individual, increased experience, or some change...

    Started by noetsi‎, 02-20-2016 01:33 PM
    • Replies: 0
    • Views: 170
    02-20-2016, 01:33 PM Go to last post
  57. Finding average amount of kerosine using the joint density function

    If I'm not mistaken, to find the average amount of kerosene left in the tank at the end of the day, we need to find the integration of f(x,y) over...

    Started by asilvester635‎, 02-18-2016 12:27 PM
    • Replies: 3
    • Views: 282
    02-20-2016, 04:55 AM Go to last post
  58. Average spending per person.

    This should be simple, but its not. I have to know how many people we can release in a future year. To do that I need to know how much on average...

    Started by noetsi‎, 10-09-2015 12:51 PM
    • Replies: 6
    • Views: 713
    02-19-2016, 04:24 PM Go to last post
  59. 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 01:01 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 1,268
    02-18-2016, 04:47 PM Go to last post
  60. Analyzing public private differences

    I am analyzing the impact of whether a provider is public or private on income increase (income is an interval variable, public/ private is a dummy...

    Started by noetsi‎, 02-12-2016 11:00 AM
    • Replies: 0
    • Views: 160
    02-12-2016, 11:00 AM Go to last post

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