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Forum: Applied Statistics

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

  1. 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, Yesterday 03:26 AM
    • Replies: 6
    • Views: 92
    Today, 06:57 AM Go to last post
  2. 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: 2
    • Views: 83
    Today, 02:54 AM Go to last post
  3. 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
    • Replies: 10
    • Views: 162
    Yesterday, 10:52 AM Go to last post
  4. 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: 1
    • Views: 49
    04-27-2016, 08:42 AM Go to last post
  5. 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: 233
    04-25-2016, 09:50 AM Go to last post
  6. 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: 68
    04-25-2016, 05:00 AM Go to last post
  7. 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: 89
    04-24-2016, 05:12 PM Go to last post
  8. 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: 186
    04-20-2016, 06:56 PM Go to last post
  9. 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: 208
    04-20-2016, 05:01 PM Go to last post
  10. 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: 84
    04-20-2016, 04:14 PM Go to last post
  11. 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: 190
    04-19-2016, 03:35 PM Go to last post
  12. 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: 88
    04-19-2016, 08:08 AM Go to last post
  13. 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: 129
    04-17-2016, 08:16 PM Go to last post
  14. 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: 112
    04-15-2016, 01:01 PM Go to last post
  15. 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: 144
    04-14-2016, 03:51 AM Go to last post
  16. 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: 332
    04-13-2016, 07:24 AM Go to last post
  17. 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: 453
    04-08-2016, 09:53 PM Go to last post
  18. 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: 141
    04-07-2016, 10:22 PM Go to last post
  19. 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: 167
    04-07-2016, 04:06 PM Go to last post
  20. 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: 265
    04-01-2016, 08:45 AM Go to last post
  21. 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: 327
    03-31-2016, 06:12 AM Go to last post
  22. 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: 335
    03-25-2016, 05:25 AM Go to last post
  23. 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: 351
    03-25-2016, 04:02 AM Go to last post
  24. 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: 170
    03-23-2016, 08:18 PM Go to last post
  25. 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: 158
    03-23-2016, 08:03 PM Go to last post
  26. 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: 429
    03-21-2016, 04:24 PM Go to last post
  27. 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: 155
    03-21-2016, 12:34 PM Go to last post
  28. 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: 149
    03-19-2016, 04:59 PM Go to last post
  29. 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: 862
    03-17-2016, 11:17 AM Go to last post
  30. 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: 340
    03-16-2016, 12:29 PM Go to last post
  31. 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: 134
    03-15-2016, 05:10 PM Go to last post
  32. 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: 137
    03-15-2016, 01:22 PM Go to last post
  33. 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: 539
    03-14-2016, 05:26 PM Go to last post
  34. 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: 109
    03-14-2016, 03:28 AM Go to last post
  35. 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: 311
    03-11-2016, 01:02 PM Go to last post
  36. 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: 469
    03-10-2016, 05:48 PM Go to last post
  37. 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: 291
    03-10-2016, 01:04 PM Go to last post
  38. 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: 333
    03-04-2016, 11:25 AM Go to last post
  39. [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: 8,121
    03-03-2016, 08:11 AM Go to last post
  40. 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: 294
    02-27-2016, 04:20 PM Go to last post
  41. 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: 211
    02-25-2016, 05:07 PM Go to last post
  42. 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: 232
    02-25-2016, 01:38 AM Go to last post
  43. 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: 586
    02-21-2016, 06:44 AM Go to last post
  44. 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: 271
    02-20-2016, 08:08 PM Go to last post
  45. 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: 154
    02-20-2016, 01:33 PM Go to last post
  46. 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: 249
    02-20-2016, 04:55 AM Go to last post
  47. 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: 655
    02-19-2016, 04:24 PM Go to last post
  48. 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: 1,213
    02-18-2016, 04:47 PM Go to last post
  49. 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: 143
    02-12-2016, 11:00 AM Go to last post
  50. Which correlation analysis to use??

    I have 10 variables which are binary in nature. The two states are 1 and 0, where 1 refers to the negative effect of the variable and 0 refers to...

    Started by dhruv2p‎, 02-11-2016 07:54 AM
    • Replies: 1
    • Views: 205
    02-12-2016, 10:58 AM Go to last post
  51. Interest Rate Threshold Probability

    I am trying to complete a model that estimates the probability a bond yield hitting (or exceeding) a certain threshold, given historical rates going...

    Started by OKUSA‎, 02-10-2016 08:39 PM
    interest rates
    • Replies: 3
    • Views: 262
    02-11-2016, 01:06 AM Go to last post
  52. Marketing - When to stop measuring

    Hello I am running a marketing campaign with a treatment and a randomly selected control. To measure the success I am observing the number of...

    Started by David Edwards‎, 02-09-2016 06:41 AM
    • Replies: 2
    • Views: 316
    02-10-2016, 03:09 AM Go to last post
  53. Modelling Reflexivity with a Time Series Model

    Hi there, I'm new to this forum so hi to everyone! I would like to find a time series model that is capable of modelling two time series with...

    Started by ReflexiveAlpha‎, 02-05-2016 07:57 AM
    • Replies: 4
    • Views: 410
    02-06-2016, 04:48 PM Go to last post
  54. What method is this?

    This comes from a slide, it is all the information I have. They say they ran this: Traditional Ordinary Least Squares (OLS) methods. Fixed...

    Started by noetsi‎, 02-02-2016 02:31 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 551
    02-04-2016, 03:55 PM Go to last post
  55. Web Traffic AB Testing

    Hi, In practice, I've seen people use Chi-Squared test for determining statistical significance in an AB test for something such as visits to...

    Started by Oberon‎, 02-04-2016 12:45 AM
    • Replies: 0
    • Views: 243
    02-04-2016, 12:45 AM Go to last post
  56. Significance between two means

    I have two means that I have calculated for a before/after study and I need to determine if they are significantly different. The means are both...

    Started by skelley80‎, 02-03-2016 10:54 AM
    • Replies: 2
    • Views: 356
    02-03-2016, 11:28 AM Go to last post
  57. Question ROI Error

    Hi, I am trying to calculate the errors for my ROI figure from targeted marketing campaigns. At the end of a campaign I have the amounts spent by the...

    Started by Snow64‎, 01-21-2016 02:29 PM
    error bound, financial modeling, roi
    • Replies: 2
    • Views: 367
    02-02-2016, 10:03 PM Go to last post
  58. Multinomial logit model and weights

    I'm using multinomial logit model in order to model whether a household owns, has access to a computer or none. Household data is weighted - it has a...

    Started by john_f‎, 01-31-2016 09:43 AM
    household surveys, multinomial logit
    • Replies: 0
    • Views: 291
    01-31-2016, 09:43 AM Go to last post
  59. obtaining nominal or base value?

    Hello, Problem definition: I have set of final values of a variable ranging from 1E-1 to 1E-5. Each final value is a product of the Nominal...

    Started by dhruv2p‎, 01-29-2016 07:04 AM
    • Replies: 0
    • Views: 244
    01-29-2016, 07:04 AM Go to last post
  60. Bootstrapping

    I am working on bootstrapping and had a question. Commonly our data sets are fairly large. We have from thousands to tens of thousands of cases. But...

    Started by noetsi‎, 01-26-2016 04:17 PM
    • Replies: 7
    • Views: 451
    01-27-2016, 09:00 PM Go to last post

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