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Forum: Applied Statistics

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

  1. 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: 1,883
    04-08-2016, 09:53 PM Go to last post
  2. 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: 1,076
    04-07-2016, 10:22 PM Go to last post
  3. 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: 1,774
    04-07-2016, 04:06 PM Go to last post
  4. 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: 1,626
    04-01-2016, 08:45 AM Go to last post
  5. 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: 1,533
    03-31-2016, 06:12 AM Go to last post
  6. 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: 2,291
    03-25-2016, 05:25 AM Go to last post
  7. 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: 2,559
    03-25-2016, 04:02 AM Go to last post
  8. 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: 1,042
    03-23-2016, 08:18 PM Go to last post
  9. 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: 1,359
    03-23-2016, 08:03 PM Go to last post
  10. 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: 1,974
    03-21-2016, 04:24 PM Go to last post
  11. 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: 1,911
    03-21-2016, 12:34 PM Go to last post
  12. 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: 1,303
    03-19-2016, 04:59 PM Go to last post
  13. 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: 2,588
    03-17-2016, 11:17 AM Go to last post
  14. 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: 1,558
    03-16-2016, 12:29 PM Go to last post
  15. 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: 581
    03-15-2016, 05:10 PM Go to last post
  16. 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: 1,094
    03-15-2016, 01:22 PM Go to last post
  17. 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 03:52 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,343
    03-14-2016, 05:26 PM Go to last post
  18. 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: 1,488
    03-14-2016, 03:28 AM Go to last post
  19. 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 11:54 AM
    • Replies: 8
    • Views: 1,422
    03-11-2016, 02:02 PM Go to last post
  20. 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 04:41 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 3,552
    03-10-2016, 06:48 PM Go to last post
  21. 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 04:46 AM
    canonical correlation, multivariate analysis, regression, statistical approach
    • Replies: 3
    • Views: 1,366
    03-10-2016, 02:04 PM Go to last post
  22. 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 05:25 AM
    • Replies: 3
    • Views: 2,378
    03-04-2016, 12:25 PM Go to last post
  23. [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: 18,574
    03-03-2016, 09:11 AM Go to last post
  24. 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 01:43 PM
    • Replies: 3
    • Views: 2,013
    02-27-2016, 05:20 PM Go to last post
  25. 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 06:07 PM
    • Replies: 0
    • Views: 2,369
    02-25-2016, 06:07 PM Go to last post
  26. 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 09:21 PM
    • Replies: 1
    • Views: 1,391
    02-25-2016, 02:38 AM Go to last post
  27. 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 04:08 AM
    • Replies: 13
    • Views: 2,172
    02-21-2016, 07:44 AM Go to last post
  28. 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 08:38 PM
    • Replies: 2
    • Views: 1,414
    02-20-2016, 09:08 PM Go to last post
  29. 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 02:33 PM
    • Replies: 0
    • Views: 1,277
    02-20-2016, 02:33 PM Go to last post
  30. 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 01:27 PM
    • Replies: 3
    • Views: 1,454
    02-20-2016, 05:55 AM Go to last post
  31. 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: 2,498
    02-19-2016, 05:24 PM Go to last post
  32. 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 02:01 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 3,300
    02-18-2016, 05:47 PM Go to last post
  33. 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 12:00 PM
    • Replies: 0
    • Views: 1,050
    02-12-2016, 12:00 PM Go to last post
  34. 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 08:54 AM
    • Replies: 1
    • Views: 897
    02-12-2016, 11:58 AM Go to last post
  35. 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 09:39 PM
    interest rates
    • Replies: 3
    • Views: 1,500
    02-11-2016, 02:06 AM Go to last post
  36. 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 07:41 AM
    • Replies: 2
    • Views: 1,676
    02-10-2016, 04:09 AM Go to last post
  37. 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 08:57 AM
    • Replies: 4
    • Views: 3,055
    02-06-2016, 05:48 PM Go to last post
  38. 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 03:31 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,973
    02-04-2016, 04:55 PM Go to last post
  39. 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 01:45 AM
    • Replies: 0
    • Views: 1,200
    02-04-2016, 01:45 AM Go to last post
  40. 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 11:54 AM
    • Replies: 2
    • Views: 1,716
    02-03-2016, 12:28 PM Go to last post
  41. 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 03:29 PM
    error bound, financial modeling, roi
    • Replies: 2
    • Views: 1,363
    02-02-2016, 11:03 PM Go to last post
  42. 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 10:43 AM
    household surveys, multinomial logit
    • Replies: 0
    • Views: 1,198
    01-31-2016, 10:43 AM Go to last post
  43. 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 08:04 AM
    • Replies: 0
    • Views: 766
    01-29-2016, 08:04 AM Go to last post
  44. 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 05:17 PM
    • Replies: 7
    • Views: 1,669
    01-27-2016, 10:00 PM Go to last post
  45. Linear slope using time data

    I am working on an applied operation problem: hours operating a machine and duty time hours. The data for these 2 variables are extracted from a...

    Started by Trolle‎, 01-26-2016 02:38 AM
    • Replies: 1
    • Views: 1,085
    01-27-2016, 05:26 PM Go to last post
  46. Graph w/ Proportions and Effects

    I thought this was a pretty interesting looking graph. This comes from SAS, but I thought anybody may appreciate it. Do we in a category that...

    Started by hlsmith‎, 01-25-2016 09:39 AM
    • Replies: 1
    • Views: 1,100
    01-25-2016, 04:22 PM Go to last post
  47. Outlier Analysis

    Since I circled back to this topic I thought I would start a thread on it :) I tend to think of statistics as some form of pure math where things...

    Started by noetsi‎, 01-19-2016 11:08 AM
    • Replies: 14
    • Views: 2,134
    01-25-2016, 12:54 PM Go to last post
  48. HELP! Probability That Any Book May Be Read

    I have a question and I'm hoping people can impart some wisdom to my dilemma. My dilemma is lack of data to apply to this problem. The question I'm...

    Started by adangerchen‎, 01-23-2016 12:11 AM
    applied statistics, data generation, probability
    • Replies: 2
    • Views: 1,725
    01-23-2016, 12:23 PM Go to last post
  49. carry trade portfolio

    Hi all Could you please tell me how to construct an equally weighted carry trade portfolio?

    Started by Nour‎, 01-21-2016 12:15 PM
    portfolio
    • Replies: 0
    • Views: 1,050
    01-21-2016, 12:15 PM Go to last post
  50. Derive component values from a bundle of goods?

    Hi everyone, Hope I picked the right forum for this question. I am wondering if it is possible to derive the value of components that are...

    Started by Londoner‎, 01-19-2016 11:20 PM
    • Replies: 2
    • Views: 1,089
    01-19-2016, 11:55 PM Go to last post
  51. help with finance problem

    Could anyone help me.. i have a database and need to answer the questions below. Analysis For the observations with fiscal year end...

    Started by ejjk993‎, 01-17-2016 06:57 AM
    • Replies: 1
    • Views: 1,763
    01-17-2016, 03:16 PM Go to last post
  52. Bayesian forecasting

    I am using the following bayesGARCH (https://cran.r-project.org/web/packages/bayesGARCH/index.html/) package in R. I am interested in forecasting...

    Started by mark.viduka‎, 01-16-2016 02:56 PM
    • Replies: 1
    • Views: 1,048
    01-16-2016, 04:15 PM Go to last post
  53. Determining significance and power of a test with fixed sample size

    I have a total population of 70K members and I 12K "kits" that I want to send out to a randomly chosen group to test if the cancellation rate is...

    Started by xandalorian‎, 01-13-2016 10:30 AM
    • Replies: 4
    • Views: 1,458
    01-15-2016, 06:04 PM Go to last post
  54. [Retail] Modelling the Effect of Weather on Key Site Metrics

    I've been given a project at work which is to build a model which is able to predict the effect of weather by location on our key site metrics...

    Started by JGee‎, 01-14-2016 10:18 AM
    • Replies: 0
    • Views: 1,550
    01-14-2016, 10:18 AM Go to last post
  55. binomial distribution problem, calculating probability from a B(p,q) distribution

    Hello everyone, I have been trying to solve this Beta distribution problem for quite some time without success. I can get as far as getting the 20...

    Started by parsec2011‎, 01-13-2016 05:30 AM
    beta, distribution, probability
    • Replies: 4
    • Views: 2,654
    01-14-2016, 06:09 AM Go to last post
  56. Joint outliers - what is this really?

    We analyze the impact of cost and duration (time in service) outliers. I tried to improve the analysis two years ago by looking at outliers on both...

    Started by noetsi‎, 11-02-2015 04:09 PM
    3 Pages
    1 2 3
    • Replies: 41
    • Views: 7,747
    01-12-2016, 02:44 PM Go to last post
  57. Principal factor analysis

    Hello everyone: I have a problem I've been trying to solve the whole day without any success and I hope that maybe you experts may help me. ...

    Started by Student90‎, 01-10-2016 08:10 PM
    • Replies: 0
    • Views: 812
    01-10-2016, 08:10 PM Go to last post
  58. Ratio - division by zero

    I am working with some data and I was hoping to look at the change in one variable as a ratio of the change in another variable (both have been...

    Started by Statistics help‎, 01-04-2016 05:00 PM
    division by zero, ratio
    • Replies: 2
    • Views: 1,703
    01-04-2016, 07:46 PM Go to last post
  59. Question Bayesian Hierarchical Customer Spend Model

    Hi guys, I am trying to set up a Bayesian Hierarchical model for customer spending, and was hoping to clarify a couple of things. I want to look at...

    Started by Snow64‎, 12-30-2015 06:17 PM
    bayesian inference, customer analytics, data analytics, financial modeling, hierarchical model
    • Replies: 2
    • Views: 2,667
    12-30-2015, 11:23 PM Go to last post
  60. Red face Setting Statistically Significant Improvement Goals

    Hi: I work in clinical informatics for very large academic hospital. Currently we are attempting to set 2016 goals for our patient satisfaction...

    Started by Lindseylr‎, 12-15-2015 03:05 PM
    • Replies: 2
    • Views: 3,176
    12-29-2015, 10:16 PM Go to last post

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