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Forum: Applied Statistics

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

  1. League of Legends team-balancing project

    Okay, I just spent about two hours carefully typing up a post. And then it got nuked on submission due to a login error. I kind of want to curl up...

    Started by CupcakeTrap‎, 06-27-2014 09:01 PM
    • Replies: 1
    • Views: 1,645
    07-12-2014, 06:53 PM Go to last post
  2. Is a team member pulling their weight as far as work is concerned?

    Hi all, This is my first post on this forum, so I hope I've put this in the right section. I'm building an Access database at work which stores...

    Started by Darren Bartrup‎, 07-11-2014 10:15 AM
    • Replies: 0
    • Views: 1,520
    07-11-2014, 10:15 AM Go to last post
  3. Smile Stata - Finance - Quarterly Rebalancing Portfolio

    Hi all, I would like to achieve the following with STATA: I have about 8 years daily stock returns that I would like to transform to cumulative...

    Started by amazon‎, 07-10-2014 12:15 AM
    stata rebalancing
    • Replies: 0
    • Views: 1,648
    07-10-2014, 12:15 AM Go to last post
  4. Optimization problem - I need a flat floor!

    Okay, so my concrete floor is not level - there are high spots and there are low spots. My goal is to achieve <1/8th inch difference between any two...

    Started by ayo jay jo‎, 07-09-2014 12:57 PM
    applied, optimization, regression, spatial, topography
    • Replies: 0
    • Views: 1,174
    07-09-2014, 12:57 PM Go to last post
  5. Portfolio Correlation from a Correlation or Covariance Matrix

    What I have: 1. Correlation matrix of assets 2. Weights of assets for various portfolios 3. Standalone standard deviation of assets 4. Also...

    Started by Theimmortal1‎, 07-07-2014 09:23 AM
    • Replies: 1
    • Views: 1,590
    07-08-2014, 08:18 AM Go to last post
  6. Predicting the missing data of population growth (time series)

    Hi all, I have 2 vectors of rural and urban populations of the same country. (years from 1975 to 2020) with only three values (1980, 1990 and 2001...

    Started by ZygisM‎, 07-08-2014 04:44 AM
    • Replies: 0
    • Views: 2,267
    07-08-2014, 04:44 AM Go to last post
  7. [Econometrics] OLS when intercept is 0

    Hi, I'm studying with the book "Introductory Econometrics, A Modern Approach" (Wooldridge, 5th edition) and I am stuck at the problem 8 from...

    Started by Error404pnf‎, 07-07-2014 09:55 AM
    • Replies: 0
    • Views: 3,464
    07-07-2014, 09:55 AM Go to last post
  8. Smile Question regarding the suitability of PCA -> Cluster Analysis approach

    Hello - I have come across an obstacle during some of the data analysis for my dissertation. I'm not in the statistics field, though understand...

    Started by treebark‎, 06-13-2014 07:43 AM
    • Replies: 4
    • Views: 1,972
    07-04-2014, 01:09 PM Go to last post
  9. Principal Component Analysis on Time Series Data

    Hi, I have carried out experiments on a multivariate system (cell growth) where I have varied one factor at 5 levels and measured a number of...

    Started by whatyapapasay‎, 06-28-2014 02:01 PM
    • Replies: 0
    • Views: 2,495
    06-28-2014, 02:01 PM Go to last post
  10. specify correct random effects

    Hi all, I have a CRD with 4 reps and 4 treatments (A, B, C, D). The study took place in 1 location for 3 years. I want to pool over years (so...

    Started by szm‎, 06-28-2014 07:08 AM
    analysis, random effect
    • Replies: 0
    • Views: 1,397
    06-28-2014, 07:08 AM Go to last post
  11. Constructing value weighted industry portfolios

    I want to construct value weighted industry portfolios and I am confused on how to do it. I want to construct my industry portfolio as french did on...

    Started by Tosync‎, 06-26-2014 09:01 AM
    • Replies: 0
    • Views: 1,095
    06-26-2014, 09:01 AM Go to last post
  12. Recommended books/resources for Campaign analytics

    Hi all! Could anybody please recommend any books, or other resources, from which I can learn Campaign analytics? I have gotten some hold of the...

    Started by info_seekeR‎, 06-22-2014 12:40 PM
    campaign analysis, marketing, marketing research, statistics
    • Replies: 0
    • Views: 1,917
    06-22-2014, 12:40 PM Go to last post
  13. Estimating 1 cointegrating relationship when trace test indicates rank=2

    I am estimating a VECM for several countries. For one country in particular (call it country X), the Johansen trace test suggests that there are two...

    Started by CLP_PS‎, 06-22-2014 10:36 AM
    • Replies: 0
    • Views: 1,603
    06-22-2014, 10:36 AM Go to last post
  14. Simple question concerning life expentancy

    First English is my second language. I have a friend who was about 35 years old in 1974, I would like to know the probability of him being alive...

    Started by Soren882‎, 06-19-2014 08:02 PM
    • Replies: 1
    • Views: 1,382
    06-21-2014, 10:24 AM Go to last post
  15. Guidance appreciated: Multinomial mixed data types population characterization

    Guidance appreciated: I have approx 40k records from about 50 colleges. Data is FERPA-compliant one student per record, with age (integer), gender,...

    Started by cassio2506‎, 06-20-2014 11:04 AM
    multinomial, simulation
    • Replies: 0
    • Views: 1,240
    06-20-2014, 11:04 AM Go to last post
  16. Poisson regression on the means of count data

    Hi Talkstats, I have a question I hope you can help me with. I just finished a small research project about hummingbirds and the effect of...

    Started by pedter‎, 06-19-2014 03:19 AM
    • Replies: 0
    • Views: 1,225
    06-19-2014, 03:19 AM Go to last post
  17. Regression with trend

    I ask this from time to time - still waiting for an answer:p When you use polynomial terms in a regression to deal with trends is this making the...

    Started by noetsi‎, 06-14-2014 01:38 PM
    • Replies: 4
    • Views: 1,930
    06-16-2014, 11:40 AM Go to last post
  18. Confidence interval for Difference in Probabilities (HELP:)

    Heehee, the 'help' worked - I got your attention, right. So, I ran a logistic regression (in SAS) with two binary categorical variables, their...

    Started by hlsmith‎, 06-12-2014 03:13 PM
    • Replies: 5
    • Views: 1,584
    06-13-2014, 03:08 PM Go to last post
  19. Combining Standard Deviations

    I have averages and standard deviations for production of 4 different factories on the same site by month. I need to size the rail car fleet. The...

    Started by MarkSzpila‎, 06-12-2014 10:33 AM
    • Replies: 2
    • Views: 2,065
    06-12-2014, 05:45 PM Go to last post
  20. Given Trendline Modify Distribution

    Hi, I'm given a trend line equation. I have a data distribution that I need to modify to fit as close as possible to this trend line. Is there...

    Started by nirvehex‎, 06-10-2014 08:19 PM
    • Replies: 0
    • Views: 1,271
    06-10-2014, 08:19 PM Go to last post
  21. Multiplicative Interaction (ordinal or disordinal)

    I have been trying to figure out ways to interpret an interaction. It is typically easy to do when you have a continuous and categorical variable in...

    Started by hlsmith‎, 06-06-2014 01:09 PM
    • Replies: 3
    • Views: 2,805
    06-09-2014, 10:36 AM Go to last post
  22. EFA and SEM

    Hi I am currently writing my master's thesis where I am working with questionnaire data. In that respect I have conducted exploratory factor...

    Started by Danfac‎, 06-07-2014 07:52 AM
    • Replies: 2
    • Views: 1,561
    06-09-2014, 03:13 AM Go to last post
  23. Missing Data

    Hi Guys I have another question for you. I am currently working with some questionnaire data and I have a question about missing data. My...

    Started by Danfac‎, 06-09-2014 03:11 AM
    • Replies: 0
    • Views: 1,167
    06-09-2014, 03:11 AM Go to last post
  24. How to test data with binary and catagorical values

    All I could not find quite the information I needed on the thread search, apologies... I am trying to help a student who has camera trap data,...

    Started by pnwright‎, 06-04-2014 10:36 AM
    • Replies: 1
    • Views: 1,304
    06-04-2014, 11:34 AM Go to last post
  25. doubts about predictive modeling approaches

    Dear All, I have some concerns about some approaches to predictive modeling used in some of the literature I am currently reading. The predictive...

    Started by gianmarco‎, 05-30-2014 12:23 AM
    • Replies: 6
    • Views: 1,618
    06-02-2014, 03:10 PM Go to last post
  26. How to determine the accuracy of three combined tests

    Hypothetically, I have three tests that can determine if someone has cancer or doesn't have cancer. A True positive would indicate that the person...

    Started by mjolnir91‎, 05-29-2014 04:45 PM
    probability, statisics
    • Replies: 2
    • Views: 1,560
    05-29-2014, 05:26 PM Go to last post
  27. Arma (2,2) - pacf

    Dear Statisticians, i have a huge request.this week i will have to present a task which i consider as pretty difficult so solve. Hopefully some...

    Started by yooo‎, 05-27-2014 03:17 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 4,844
    05-29-2014, 11:48 AM Go to last post
  28. Data-fusion / Meta-analysis

    Description I have three separate test I perform over the course of an interview. At the end of the interview the tests analyze their respective...

    Started by mjolnir91‎, 05-28-2014 10:15 AM
    bayesian, fisher, meta analysis, roc analysis
    • Replies: 4
    • Views: 1,702
    05-28-2014, 04:03 PM Go to last post
  29. Help with an exam

    can anyone please help with with question 3 part e in this exam paper please. cannot seem to work it out, thanks

    Started by Owhiting‎, 05-28-2014 04:51 AM
    • Replies: 3
    • Views: 1,468
    05-28-2014, 08:41 AM Go to last post
  30. General Forecasting Question

    Hello all first time post on this forum. I read around a few threads, and there's definitely some good information here. My question is regarding...

    Started by blufish‎, 02-16-2014 06:49 PM
    • Replies: 9
    • Views: 2,233
    05-27-2014, 12:44 PM Go to last post
  31. Comparing distribution of values in a subset from an exponential distribution

    Hi, I have one a vector of measurements taken from 30000 individuals. The measurements have an exponential distribution (histogram is shown in...

    Started by Andorin‎, 05-26-2014 10:08 AM
    • Replies: 0
    • Views: 1,452
    05-26-2014, 10:08 AM Go to last post
  32. Question Minimum required number of respondents - searching statistics

    Hi there! I am new to the forum so I hope I am posting in the correct place. The goal is to count percentage of users from Northern America with...

    Started by chloe_p‎, 05-16-2014 07:53 AM
    • Replies: 3
    • Views: 2,997
    05-21-2014, 10:57 AM Go to last post
  33. Principal Component Analysis (polychoric) STATA

    I have 3 years of data for each U.S. state regarding health and wellness policies. The data consist of survey responses to approximately 90...

    Started by stasiaksmith‎, 05-17-2014 11:07 AM
    • Replies: 0
    • Views: 2,241
    05-17-2014, 11:07 AM Go to last post
  34. Sort using Likert?

    Hi! I'm looking for information on using a Likert-type survey to sort a list of preferences for a group. An example could be a list of 50 different...

    Started by A likert‎, 05-16-2014 10:32 PM
    likert, sort, survey
    • Replies: 0
    • Views: 2,014
    05-16-2014, 10:32 PM Go to last post
  35. Value at Risk: Model Validation

    I am new to the forum so I hope I am posting in the correct place. PROBLEM: As I am exposed to upper risk in one particular marketed security, I...

    Started by Qstat‎, 05-15-2014 02:56 AM
    confidence level, excel, value at risk
    • Replies: 0
    • Views: 1,498
    05-15-2014, 02:56 AM Go to last post
  36. Biased and un-biased estimators.

    I am working with the Rayleigh-distribution and note that on Wikipedia they say that s^2 = 1/(2N) sum x_i^2 is an unbiased estimator of sigma^2....

    Started by ravn‎, 05-14-2014 11:13 PM
    estimation, rayleigh distribution, unbiased estimator
    • Replies: 1
    • Views: 1,671
    05-14-2014, 11:23 PM Go to last post
  37. convincing correlations

    I have two time series. The first is very well sampled, it's an 6-year-long time series of hourly wind data. My second time series is an...

    Started by geologist‎, 04-09-2014 10:38 AM
    correlations; time series
    • Replies: 2
    • Views: 1,834
    05-14-2014, 06:04 AM Go to last post
  38. Getting the most out of logistic regression on voting

    Hi there! I got a limited data set on approx 2000 voters of Sweden. I'm trying to fit a logit model to this but without any success. One problem...

    Started by Filipw‎, 05-09-2014 05:49 AM
    • Replies: 9
    • Views: 1,776
    05-13-2014, 03:47 PM Go to last post
  39. Arma model fitting

    Below is my data. Only lag 2 is significant in both pacf and acf plot.EACF says it is ARMA(0,2) and I think it can be. However,if it is, aren't...

    Started by arke9‎, 05-10-2014 01:48 AM
    arma, time series
    • Replies: 1
    • Views: 1,855
    05-12-2014, 05:10 PM Go to last post
  40. reproducibility and stability of the system using the error or the standard deviation

    I am trying to check the reproducibility of my experiments and the stability of my system. So, I measure the viscosity of different samples. For...

    Started by zied‎, 05-08-2014 05:59 AM
    • Replies: 0
    • Views: 2,117
    05-08-2014, 05:59 AM Go to last post
  41. FBI Statistics on Homicide Circumstances

    I am not a student and this is not any type of project or homework problem. ...

    Started by TrimTab‎, 05-07-2014 04:08 PM
    • Replies: 0
    • Views: 1,390
    05-07-2014, 04:08 PM Go to last post
  42. Forecasting time series - method for picking up a model?

    Hi I'm trying to predict a variable. Time series data. I tried 2 ways. ARMAX and VAR. I resized the data and i leaved the last 3 months to compare...

    Started by jfca283‎, 05-07-2014 03:18 PM
    • Replies: 0
    • Views: 1,269
    05-07-2014, 03:18 PM Go to last post
  43. Chained Price Index Chart

    Dear, I have following price indices for between adjacent periods (2009, 2010, 2011, and 2012): 100 (base), 95, 115 and 113. The values were...

    Started by john_f‎, 05-07-2014 04:32 AM
    • Replies: 0
    • Views: 1,738
    05-07-2014, 04:32 AM Go to last post
  44. Intervention analysis/ARIMA

    One form of ARIMA is using a dummy variable (or sometimes time) to predict a Y when an intervention occurs at some point. You are really testing if...

    Started by noetsi‎, 04-29-2014 03:47 PM
    • Replies: 2
    • Views: 1,815
    05-05-2014, 03:30 PM Go to last post
  45. How many plants for an experiment?

    Greetings. I am hoping to answer whether caterpillar survival inside versus outside a garden differs. At my research site there are 12 gardens...

    Started by ania0725‎, 05-05-2014 03:06 PM
    • Replies: 0
    • Views: 2,235
    05-05-2014, 03:06 PM Go to last post
  46. Correlation coefficients

    Dear All, I'm an italian guy who is experiencing problems with his stat text. The exercise is as follow: Fill the following table: ...

    Started by stattrouble‎, 05-05-2014 09:30 AM
    • Replies: 0
    • Views: 817
    05-05-2014, 09:30 AM Go to last post
  47. Testing question

    I am currently working on something for work where I have a population with a test group and a control group. From each group I am gathering two...

    Started by sammclfc1991‎, 04-29-2014 06:54 AM
    • Replies: 1
    • Views: 1,094
    04-29-2014, 10:04 AM Go to last post
  48. Seasonal non-stationarity

    I was wondering how one spots seasonal non-stationarity (or more accurately I guess separate normal non-stationarity from seasonal non-stationarity)?...

    Started by noetsi‎, 04-28-2014 04:41 PM
    • Replies: 0
    • Views: 1,313
    04-28-2014, 04:41 PM Go to last post
  49. Lost on how to start. variable input?

    First I am not the best at statistics and just learning so please forgive me if I use the wrong vocabulary to describe something. Also forgive me if...

    Started by ristintin‎, 04-26-2014 09:02 PM
    • Replies: 0
    • Views: 1,563
    04-26-2014, 09:02 PM Go to last post
  50. Sample Size Calculation for Confidence Level

    I have a sensor that can detect elastomeric "pellets" (for lack of a better term) that may be present in small vials of opaque fluid. So, for any...

    Started by JAcheson‎, 04-24-2014 11:48 AM
    • Replies: 0
    • Views: 2,272
    04-24-2014, 11:48 AM Go to last post
  51. Logging time series used in projections

    It is often recommended that you log transform time series where variation is changing over time. When you use this data to predict future data do...

    Started by noetsi‎, 04-24-2014 10:20 AM
    • Replies: 0
    • Views: 1,465
    04-24-2014, 10:20 AM Go to last post
  52. testing errors in true among several services

    We want to be able to estimate by product the percent of prices recorded differently that in written contracts. Verification is costly. I am...

    Started by nhammond‎, 04-23-2014 09:48 AM
    heterogeneous, multi sub samples, prior probabilities, sample
    • Replies: 0
    • Views: 973
    04-23-2014, 09:48 AM Go to last post
  53. Reason of using Peason distribution over Normal distribution?

    Dear all, (Sorry about the typo, it is "Pearson" Not "Peason".) I am running an analysis of a manufacturing process flow. The measurement...

    Started by Lawrence‎, 04-22-2014 05:02 AM
    • Replies: 3
    • Views: 1,297
    04-22-2014, 09:40 PM Go to last post
  54. Number of factors in Factor Analysis

    Hello, I am trying to run factor analysis on 10 ordinal variables from a scale of 1-7. I was trying several software packages, and one asked me...

    Started by NN_STAT‎, 04-22-2014 02:12 AM
    • Replies: 0
    • Views: 1,084
    04-22-2014, 02:12 AM Go to last post
  55. Am I doing factor analysis right?

    I haven't seen this yet in class, but I have watched a couple of youtube videos and wonder if I am doing this right. I have several items that...

    Started by Annvdb‎, 03-16-2014 01:30 AM
    • Replies: 1
    • Views: 1,486
    04-18-2014, 12:14 PM Go to last post
  56. Post Looking for an appropriate data analysis techniques for production process data!

    Hi group members, I am shamima, a recent graduate in Biostatistics from University of Waterloo, ON, Canada and I am new to this forum. Currently I...

    Started by Zaman‎, 03-26-2014 08:35 AM
    • Replies: 4
    • Views: 1,533
    04-18-2014, 12:04 PM Go to last post
  57. Principal components interpretation

    Hi all, So i have a matrix of of correlation coefficients between X_i, which are standardised variables, and Y_j, which are the principal...

    Started by Prometheus‎, 04-14-2014 08:07 AM
    • Replies: 4
    • Views: 1,085
    04-18-2014, 11:51 AM Go to last post
  58. Yet another ESM question

    ESM = Exponential smoothing Some suggest you chose your ESM model, e.g., Holt Winters, based on whether the data looks like it will support a...

    Started by noetsi‎, 04-18-2014 10:12 AM
    • Replies: 0
    • Views: 907
    04-18-2014, 10:12 AM Go to last post
  59. Poisson regression

    Hello to everyone!:):) We need some help for a Poisson Regression: Our problem is to determine if there is a relationship between the return on...

    Started by eve1987‎, 04-16-2014 11:27 AM
    • Replies: 1
    • Views: 2,042
    04-16-2014, 03:41 PM Go to last post
  60. Time series with variables of different orders of integration

    I have addressed this before, but it remains one of the most puzzling elements to me. Say you have a DV that is I and some of the predictors are I...

    Started by noetsi‎, 04-14-2014 11:37 AM
    • Replies: 0
    • Views: 1,686
    04-14-2014, 11:37 AM Go to last post

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