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Forum: Applied Statistics

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

  1. Time Series Analysis

    I have data that is spatial and temporal. Each data point at each time contains multiple signals of interest (some are spatially autocorrelated, some...

    Started by harry_‎, Yesterday 04:39 AM
    • Replies: 3
    • Views: 86
    Yesterday, 10:30 AM Go to last post
  2. Non-parametric methods

    A book I am reading now on non-parametrics argues that t test may be still accurate in large sample sizes even if the distribution assumptions are...

    Started by noetsi‎, 07-28-2014 03:10 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 316
    07-29-2014, 01:56 PM Go to last post
  3. Justifying studying simulations

    Here I am talking about simulations such as monte carlo. I have often seen these used in statistical text/articles, for example to test an assumption...

    Started by noetsi‎, 07-28-2014 11:10 AM
    • Replies: 4
    • Views: 106
    07-29-2014, 12:56 AM Go to last post
  4. Acf Pacf interpretation for ARMA modeling

    Hi, I have trouble interpreting acf and pacf of the stationary series depicted. Could I receive some suggested interpretations, with focus on...

    Started by s0050506‎, 07-28-2014 03:23 PM
    • Replies: 4
    • Views: 88
    07-28-2014, 04:22 PM Go to last post
  5. 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: 2
    • Views: 141
    07-28-2014, 09:21 AM Go to last post
  6. 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: 13
    • Views: 317
    07-28-2014, 03:06 AM Go to last post
  7. 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, 07-21-2014 03:32 PM
    coefficient, correlation, matrix
    • Replies: 5
    • Views: 199
    07-26-2014, 09:09 AM Go to last post
  8. What is and is not a convenience sample

    It is well accepted that 'convenience samples" can not be used to make statistical inference, essentially because they are not a random sample of the...

    Started by noetsi‎, 07-24-2014 12:45 PM
    • Replies: 10
    • Views: 215
    07-25-2014, 01:32 AM Go to last post
  9. Average in semi dependent observations.

    I have a dataset of measurements (i.e., differences; which are continuous), with some individuals contributing a single measurement while others have...

    Started by hlsmith‎, 07-24-2014 09:12 AM
    • Replies: 4
    • Views: 94
    07-24-2014, 06:59 PM Go to last post
  10. How to assess impact over time

    I am looking at rehab rates (which are coded either successful or unsucessful)) and factors which influence them. This is a case where both the rehab...

    Started by noetsi‎, 07-23-2014 05:04 PM
    • Replies: 0
    • Views: 77
    07-23-2014, 05:04 PM Go to last post
  11. 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, 07-22-2014 07:45 AM
    • Replies: 1
    • Views: 89
    07-22-2014, 10:31 AM Go to last post
  12. 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: 397
    07-21-2014, 02:29 PM Go to last post
  13. 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: 781
    07-21-2014, 12:33 PM Go to last post
  14. 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: 154
    07-17-2014, 08:21 PM Go to last post
  15. 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: 294
    07-15-2014, 11:34 AM Go to last post
  16. 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: 58
    07-12-2014, 06:53 PM Go to last post
  17. 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: 91
    07-11-2014, 10:15 AM Go to last post
  18. 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: 85
    07-10-2014, 12:15 AM Go to last post
  19. 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: 71
    07-09-2014, 12:57 PM Go to last post
  20. 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: 120
    07-08-2014, 08:18 AM Go to last post
  21. 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: 120
    07-08-2014, 04:44 AM Go to last post
  22. [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: 109
    07-07-2014, 09:55 AM Go to last post
  23. 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: 274
    07-04-2014, 01:09 PM Go to last post
  24. 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: 208
    06-28-2014, 02:01 PM Go to last post
  25. 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: 182
    06-28-2014, 07:08 AM Go to last post
  26. 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: 143
    06-26-2014, 09:01 AM Go to last post
  27. 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: 259
    06-22-2014, 12:40 PM Go to last post
  28. 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: 199
    06-22-2014, 10:36 AM Go to last post
  29. 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: 307
    06-21-2014, 10:24 AM Go to last post
  30. 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: 206
    06-20-2014, 11:04 AM Go to last post
  31. 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: 1,405
    06-19-2014, 11:52 AM Go to last post
  32. 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: 157
    06-19-2014, 03:19 AM Go to last post
  33. 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: 223
    06-16-2014, 11:40 AM Go to last post
  34. 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: 284
    06-13-2014, 03:08 PM Go to last post
  35. 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: 202
    06-12-2014, 05:45 PM Go to last post
  36. 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: 242
    06-10-2014, 08:19 PM Go to last post
  37. 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: 211
    06-09-2014, 10:36 AM Go to last post
  38. 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: 330
    06-09-2014, 03:13 AM Go to last post
  39. 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: 188
    06-09-2014, 03:11 AM Go to last post
  40. 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: 203
    06-04-2014, 11:34 AM Go to last post
  41. 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: 396
    06-02-2014, 03:10 PM Go to last post
  42. 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: 287
    05-29-2014, 05:26 PM Go to last post
  43. 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: 500
    05-29-2014, 11:48 AM Go to last post
  44. 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: 268
    05-28-2014, 04:03 PM Go to last post
  45. 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: 192
    05-28-2014, 08:41 AM Go to last post
  46. 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: 486
    05-27-2014, 12:44 PM Go to last post
  47. 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: 224
    05-26-2014, 10:08 AM Go to last post
  48. 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: 304
    05-21-2014, 10:57 AM Go to last post
  49. 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: 250
    05-17-2014, 11:07 AM Go to last post
  50. 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: 170
    05-16-2014, 10:32 PM Go to last post
  51. 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: 184
    05-15-2014, 02:56 AM Go to last post
  52. 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: 175
    05-14-2014, 11:23 PM Go to last post
  53. 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: 259
    05-14-2014, 06:04 AM Go to last post
  54. 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: 347
    05-13-2014, 03:47 PM Go to last post
  55. 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: 201
    05-12-2014, 05:10 PM Go to last post
  56. 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: 78,033
    05-12-2014, 09:10 AM Go to last post
  57. 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: 194
    05-08-2014, 05:59 AM Go to last post
  58. 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: 238
    05-07-2014, 04:08 PM Go to last post
  59. 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: 237
    05-07-2014, 03:18 PM Go to last post
  60. 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: 165
    05-07-2014, 04:32 AM Go to last post

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