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Forum: Applied Statistics

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

  1. After model selection: Estimated parameters are not reliable

    Hello, I have conducted an experiment which manipulated three factors (Factor 1: 3 levels, Factor 2: 2 levels, Factor 3: 2 levels). The response...

    Started by Scarlatti‎, 07-20-2014 06:27 PM
    • Replies: 2
    • Views: 97
    Today, 06:39 PM Go to last post
  2. Adjusted Exponential Smoothing w a trend

    Hello, I am in need of help for my applied statistics class. I have read the book and looked on the internet for the help but I am still lost....

    Started by henrito0‎, Today 07:45 AM
    • Replies: 1
    • Views: 65
    Today, 10:31 AM Go to last post
  3. Post Puzzled by Correlation

    This is a real problem although I'm using a made-up statistic (# of apples) for this. Say I am interested in how many apples people eat in a year....

    Started by idealliu‎, Yesterday 03:32 PM
    coefficient, correlation, matrix
    • Replies: 4
    • Views: 146
    Yesterday, 05:32 PM Go to last post
  4. Forecasting bus mileage - what is the best way

    We are trying to figure out when the engines on a specific bus will hit the mileage as designated per engine. I m having the darndest time trying to...

    Started by lehi52‎, 06-26-2014 03:55 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 371
    Yesterday, 02:29 PM Go to last post
  5. Binary Logistic Regression: general issue and question about model fit

    Hello Guys, I would appreciate to have some feedback on an issue I am faced with. Thank you in advance for the time you will possibly spend in...

    Started by gianmarco‎, 07-10-2014 07:28 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 715
    Yesterday, 12:33 PM Go to last post
  6. Historical Unemployment Forecast Data. Where can I find it?

    Hi, I am trying to find Historical Unemployment Forecast data. Harder than expected. Anybody knows where to find that? I am also looking for...

    Started by amazon‎, 07-16-2014 09:37 PM
    unemployment forecast
    • Replies: 3
    • Views: 134
    07-17-2014, 08:21 PM Go to last post
  7. Ecologists & Sociologist views wanted: Species found together

    I am curious about some ecological statistics/scores. I believe that across times species of animals may migrate to different locations. This...

    Started by trinker‎, 07-11-2014 10:36 AM
    ecological statistics, sociolog
    • Replies: 12
    • Views: 283
    07-15-2014, 11:34 AM Go to last post
  8. 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: 41
    07-12-2014, 06:53 PM Go to last post
  9. 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: 82
    07-11-2014, 10:15 AM Go to last post
  10. 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: 74
    07-10-2014, 12:15 AM Go to last post
  11. 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: 63
    07-09-2014, 12:57 PM Go to last post
  12. 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: 109
    07-08-2014, 08:18 AM Go to last post
  13. 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: 111
    07-08-2014, 04:44 AM Go to last post
  14. [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: 96
    07-07-2014, 09:55 AM Go to last post
  15. 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: 262
    07-04-2014, 01:09 PM Go to last post
  16. Handling Pearson's spurious correlation problem

    Hi all, I'm working on an analysis question for my organization. We recently introduced a new team of system analysts to augment the role the...

    Started by schwartzaw‎, 07-03-2014 07:07 AM
    • Replies: 1
    • Views: 108
    07-03-2014, 10:46 AM Go to last post
  17. 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: 199
    06-28-2014, 02:01 PM Go to last post
  18. 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: 171
    06-28-2014, 07:08 AM Go to last post
  19. 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: 135
    06-26-2014, 09:01 AM Go to last post
  20. 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: 246
    06-22-2014, 12:40 PM Go to last post
  21. 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: 188
    06-22-2014, 10:36 AM Go to last post
  22. 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: 300
    06-21-2014, 10:24 AM Go to last post
  23. 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: 196
    06-20-2014, 11:04 AM Go to last post
  24. European Social Survey -- income variable

    If you have worked with the ESS and are familiar with the vagaries of the income variable, perhaps you can help me identify a solution to a specific...

    Started by dbartram‎, 06-20-2013 10:45 AM
    ess
    • Replies: 9
    • Views: 1,365
    06-19-2014, 11:52 AM Go to last post
  25. 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: 149
    06-19-2014, 03:19 AM Go to last post
  26. 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: 208
    06-16-2014, 11:40 AM Go to last post
  27. 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: 274
    06-13-2014, 03:08 PM Go to last post
  28. 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: 194
    06-12-2014, 05:45 PM Go to last post
  29. 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: 234
    06-10-2014, 08:19 PM Go to last post
  30. 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: 191
    06-09-2014, 10:36 AM Go to last post
  31. 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: 317
    06-09-2014, 03:13 AM Go to last post
  32. 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: 179
    06-09-2014, 03:11 AM Go to last post
  33. 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: 188
    06-04-2014, 11:34 AM Go to last post
  34. 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: 385
    06-02-2014, 03:10 PM Go to last post
  35. 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: 277
    05-29-2014, 05:26 PM Go to last post
  36. 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: 489
    05-29-2014, 11:48 AM Go to last post
  37. 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: 255
    05-28-2014, 04:03 PM Go to last post
  38. 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: 184
    05-28-2014, 08:41 AM Go to last post
  39. 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 05:49 PM
    • Replies: 9
    • Views: 478
    05-27-2014, 12:44 PM Go to last post
  40. 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: 216
    05-26-2014, 10:08 AM Go to last post
  41. 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: 286
    05-21-2014, 10:57 AM Go to last post
  42. 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: 241
    05-17-2014, 11:07 AM Go to last post
  43. 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: 163
    05-16-2014, 10:32 PM Go to last post
  44. 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: 173
    05-15-2014, 02:56 AM Go to last post
  45. 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: 168
    05-14-2014, 11:23 PM Go to last post
  46. 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: 252
    05-14-2014, 06:04 AM Go to last post
  47. 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: 333
    05-13-2014, 03:47 PM Go to last post
  48. 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: 188
    05-12-2014, 05:10 PM Go to last post
  49. An average of standard deviations?

    Hello, My apologies if this isn't the correct forum for this, but I'm trying to analyze some data and can't figure out how to obtain an accurate...

    Started by indoze‎, 11-05-2010 08:53 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 77,221
    05-12-2014, 09:10 AM Go to last post
  50. 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: 185
    05-08-2014, 05:59 AM Go to last post
  51. 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: 232
    05-07-2014, 04:08 PM Go to last post
  52. 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: 227
    05-07-2014, 03:18 PM Go to last post
  53. 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: 155
    05-07-2014, 04:32 AM Go to last post
  54. 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: 292
    05-05-2014, 03:30 PM Go to last post
  55. 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: 176
    05-05-2014, 03:06 PM Go to last post
  56. 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: 153
    05-05-2014, 09:30 AM Go to last post
  57. 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: 260
    04-29-2014, 10:04 AM Go to last post
  58. 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: 251
    04-28-2014, 04:41 PM Go to last post
  59. 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: 223
    04-26-2014, 09:02 PM Go to last post
  60. 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: 222
    04-24-2014, 11:48 AM Go to last post

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