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Forum: Applied Statistics

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

  1. Confidence Interval for Weighted Average Price Increases : Valid Approach?

    My goal is to measure a price increase from month to month at the invoice level and to include a valid confidence interval for each month to month...

    Started by marcon33‎, 10-06-2012 12:14 PM
    • Replies: 3
    • Views: 5,768
    10-20-2012, 12:57 PM Go to last post
  2. test a marketing effect

    Suppose a company has retail stores in two regions, A & B and ran a marketing campaign in region B for 3 months. The average monthly store sales...

    Started by aha123‎, 10-19-2012 01:11 PM
    • Replies: 4
    • Views: 2,116
    10-19-2012, 02:24 PM Go to last post
  3. Testing Difference of Values from Lognormal Distribution?

    I have data that fits a lognormal distribution really well. My primary goal is to create a statistical classifier using this distribution to apply to...

    Started by LMC2012‎, 10-10-2012 08:01 AM
    lognormal, significance test
    • Replies: 1
    • Views: 3,730
    10-12-2012, 06:41 AM Go to last post
  4. Failure Prediction Model - Intersecting Distributions?

    Hi all, I'm not a statistician and worried that my question is to sophmoric, so I'm hoping for your patience. I have a use profile for a product...

    Started by vgrumbles‎, 10-11-2012 07:54 PM
    • Replies: 1
    • Views: 1,397
    10-12-2012, 06:30 AM Go to last post
  5. Combining several estimates to obtain "best guess" with confidence limits

    I have a number of estimates for mean wind speed which have been derived from a number of difference sources, each using a different methodology and...

    Started by MikeT‎, 10-11-2012 07:15 PM
    • Replies: 1
    • Views: 1,736
    10-12-2012, 06:21 AM Go to last post
  6. Missing values problem

    I trying to set up a count model Poisson for number of births of women. I have a datavariable giving age_of_respondent_at_first_birth. Some women...

    Started by JesperHP‎, 10-10-2012 02:57 PM
    • Replies: 4
    • Views: 2,197
    10-11-2012, 04:43 PM Go to last post
  7. Deriving at Normality Assumption

    I have taken from this forum that a way to determine normality for a TTest, is that you can take the mean of one group in the strata and subtract it...

    Started by hlsmith‎, 10-11-2012 01:47 PM
    • Replies: 3
    • Views: 1,881
    10-11-2012, 02:31 PM Go to last post
  8. Right Anova in SigmaPlot

    Hey guys, I got a set of data where 3 substances are tested on 7-9 different animals. And all of this over a time course of 30 - 240 minutes. I...

    Started by damnation‎, 10-11-2012 11:52 AM
    • Replies: 0
    • Views: 2,924
    10-11-2012, 11:52 AM Go to last post
  9. Combined ANOVA

    Hi everybody, My problem is as follows: I designed three plots of 250 m2 On each plots there is three plant species with 3 replicates by...

    Started by julienP‎, 10-10-2012 04:17 AM
    combined anova, filed experiment, plots, species
    • Replies: 1
    • Views: 3,132
    10-11-2012, 02:38 AM Go to last post
  10. Sample size for requirement test

    Hi all - probably a simple question but I'm not understanding the various articles and such that I've looked up. Here's the problem ... I have to...

    Started by astrogeek‎, 10-09-2012 09:28 PM
    • Replies: 2
    • Views: 1,379
    10-10-2012, 08:31 AM Go to last post
  11. Partially linear (semi-parametric) difference in differences models with clustered SE

    Hi All, I'm digging through stats literature, and not really finding what I need. I'm looking for a difference in differences estimator that uses...

    Started by andrewcd‎, 10-03-2012 05:10 PM
    clustering, panel, sandwich, semiparametric
    • Replies: 0
    • Views: 1,697
    10-03-2012, 05:10 PM Go to last post
  12. Lightbulb What is the best way to analyze this data?

    I have collected data over three different years (1982, 1992 and 2012) from a professional association. Each of these years had different sample...

    Started by ferfer‎, 10-03-2012 08:48 AM
    • Replies: 5
    • Views: 1,699
    10-03-2012, 03:53 PM Go to last post
  13. ANOVA One-way Vs Factorial ANOVA. Discordant results.

    Hi everybody, I have to investigate the influence of many categorical factors (A,B,C) on a continuous response variable (Y). The procedure I'm...

    Started by nelson85‎, 09-28-2012 10:07 AM
    ancova, anova, multicollinearity
    • Replies: 5
    • Views: 5,795
    10-03-2012, 07:47 AM Go to last post
  14. Pearon's chi square // xtpoisson

    Hi, I am using Poisson, fixed effects on stata and intend to adjust the standard errors because overdispersion using Pearson chi-square. In stata...

    Started by marciano‎, 09-08-2012 02:42 PM
    • Replies: 1
    • Views: 3,498
    09-20-2012, 05:04 AM Go to last post
  15. How do I rank variables collected by a Likert scale questionnaire?

    I have gathered data from about 70 construction firms who are not currently using a specific software and I asked them why they have not implemented...

    Started by ali1362‎, 09-02-2012 08:05 AM
    likert scale analysis, ranking
    • Replies: 2
    • Views: 4,517
    09-05-2012, 01:27 PM Go to last post
  16. solving to zero for multiple scenarios for best result

    I have a problem but I'm not sure where to start, here is my scenario: There are 50 diseases out there 100 people have one or more of these...

    Started by pjc‎, 08-31-2012 03:58 PM
    • Replies: 8
    • Views: 1,973
    08-31-2012, 09:13 PM Go to last post
  17. Correlation of Leading & Lagging Indicators

    Greetings. I am working on a organizational performance dashboard for my company. I have identified lagging and leading indicators in five...

    Started by WizardsAreAlwaysOnTime‎, 08-30-2012 10:22 AM
    analytics, correlation analysis, metrics, reliability, sas
    • Replies: 5
    • Views: 5,742
    08-31-2012, 02:13 PM Go to last post
  18. Prediction Accuracy and Sample Asymmetry

    Hi everyone, This is my first post to the site. I'm far from an expert when it comes to statistics, but I have a decent ability to apply what I do...

    Started by PaperTiger‎, 08-30-2012 03:20 AM
    • Replies: 0
    • Views: 1,684
    08-30-2012, 03:20 AM Go to last post
  19. Grouping similar competitors

    Suppose we want to look at which airlines have similar pricing strategies. The data set looks like this: Variables: Flight Origination, Flight...

    Started by aha123‎, 08-29-2012 11:16 AM
    • Replies: 9
    • Views: 2,445
    08-29-2012, 04:47 PM Go to last post
  20. actual prices and two predictions -> ANOVA or MANOVA?

    Hello everybody, I'm unsure which stats to use for the following problem: I've got a list of prices for stocks of a certain date. In that list...

    Started by paul_b‎, 08-19-2012 01:09 PM
    anova, manova
    • Replies: 4
    • Views: 2,506
    08-27-2012, 01:58 AM Go to last post
  21. Regression analysis help

    Hello! I'm sorry I don't know yet how to create a thread for my inquiry. I have a problem with my study, that is, I only have 10 respondent...

    Started by Gibi‎, 08-21-2012 01:19 AM
    • Replies: 4
    • Views: 2,791
    08-26-2012, 11:56 AM Go to last post
  22. composite index with PCA derived weights

    composite index with PCA derived weights Seasons greetings ! I was trying to develop a composite index of vulnerability including 38...

    Started by bmkraju‎, 08-05-2012 05:20 PM
    • Replies: 2
    • Views: 4,893
    08-22-2012, 12:58 PM Go to last post
  23. Applying standard statistics if samples measurements are grouped?

    Hi there, I am facing what it might be a dumb doubt. We are tracking the weight gain of three different groups of pigs that are being fed...

    Started by ZeliWeb‎, 08-20-2012 05:55 PM
    • Replies: 0
    • Views: 1,383
    08-20-2012, 05:55 PM Go to last post
  24. Question European Central Bank Communications vs. Policy - Ordered Probit

    I'm not sure if this is 100% the best forum to post this but I figured I would give it a shot. I'm currently researching the consistency between...

    Started by Groundbase‎, 08-16-2012 07:05 AM
    • Replies: 0
    • Views: 1,263
    08-16-2012, 07:05 AM Go to last post
  25. Pointers - Creating a model for predictions

    I'm a student doing a project for a retail company that is trying to calculate their lost sales due to malfunctioning products. To do this we've done...

    Started by Greyco‎, 08-14-2012 11:59 PM
    • Replies: 3
    • Views: 1,576
    08-15-2012, 12:26 PM Go to last post
  26. Market Research Stats - Help Needed!

    Hi All I was hoping to get some advice on how to apply a particular statistical approach used in Market Research. In my previous role we used a...

    Started by OneTwoThreeFour‎, 08-15-2012 11:41 AM
    market research
    • Replies: 0
    • Views: 1,723
    08-15-2012, 11:41 AM Go to last post
  27. Serial Correlation

    I have a set of 75 independent and dependent variables. The independent variables are collected each January 1 and the dependent variables represent...

    Started by cisaak‎, 08-09-2012 02:05 PM
    • Replies: 1
    • Views: 1,523
    08-14-2012, 01:04 PM Go to last post
  28. Statistical Protection from a Hacker

    Hi everybody! Suppose that a poker player is banned from a poker website due to his/her misbehaviour. This player creates a new account from a new...

    Started by toumbous‎, 08-12-2012 05:42 AM
    • Replies: 4
    • Views: 1,938
    08-13-2012, 09:41 AM Go to last post
  29. Lightbulb Forecasting

    Background: I have been given a yearly forecast for a product. I have also looked up actual sales for this product for the first half of the year....

    Started by Breadmaker‎, 08-10-2012 10:57 AM
    • Replies: 0
    • Views: 1,321
    08-10-2012, 10:57 AM Go to last post
  30. Smile GPA's data base

    hello all I have a database consists of 251 variables which represent the courses of science faculty of Benghazi university, the cases represent the...

    Started by osamahamza‎, 08-09-2012 09:33 PM
    • Replies: 0
    • Views: 1,970
    08-09-2012, 09:33 PM Go to last post
  31. PUMA and FIPS

    I have two datasets, one with census PUMA ids and another with FIPS code. Can anyone explain how to convert one id to the other so I can merge the...

    Started by felichar‎, 08-09-2012 12:24 PM
    • Replies: 1
    • Views: 4,512
    08-09-2012, 07:51 PM Go to last post
  32. Help please!!

    I am working on a paper and I am stumped by this question, "Critically analyze the uses and abuses of Statistics as applied to human services...

    Started by Seansgirl37‎, 08-09-2012 01:51 PM
    • Replies: 1
    • Views: 1,461
    08-09-2012, 01:52 PM Go to last post
  33. Covariance matrix singularity

    Hello, Could anyone explain, why the matrix of covariance becomes singular when the the number of parameters P is less then the number of samples...

    Started by Elena‎, 08-08-2012 02:32 AM
    covariance matrix
    • Replies: 2
    • Views: 2,373
    08-09-2012, 07:46 AM Go to last post
  34. Analyzing multiyear data

    Hi all, I have a question regarding the use of correct outcome measure when we utilize multiyear data. Suppose I am assessing 'hospital use by...

    Started by Astha‎, 08-01-2012 07:59 PM
    • Replies: 1
    • Views: 2,119
    08-07-2012, 02:47 PM Go to last post
  35. Fantasy Football: determining scarcity

    I know that there are other fantasy football questions on the forum, and I have read them. Mine is a little bit different. I am looking for an...

    Started by j4pac‎, 08-01-2012 04:51 PM
    • Replies: 5
    • Views: 4,437
    08-01-2012, 09:50 PM Go to last post
  36. Anderson-Darling Goodness of Fit test

    Hi there I would like to know if anyone has a PDF copy of the Table of Anderson-Darling critical values at the 5% significance level for a Weibull...

    Started by Bhekisizwe‎, 08-01-2012 09:29 AM
    anderson, darling, goodness of fit
    • Replies: 0
    • Views: 1,861
    08-01-2012, 09:29 AM Go to last post
  37. RPM vs Oil pressure vs Oil temp

    Hello, I'm having 3 different measuring data (RPM - oil pressure - oil temp), and I want this to be in a table as in the example. Does anybody...

    Started by Rautje‎, 07-31-2012 04:18 AM
    • Replies: 0
    • Views: 2,758
    07-31-2012, 04:18 AM Go to last post
  38. Potato Breeding Strategy

    Hi everyone, I wonder if any of you could provide a statistical argument for the best strategy to follow in my potato breeding. Vaguely, the...

    Started by Carlos123‎, 05-14-2012 10:56 AM
    • Replies: 1
    • Views: 1,845
    07-31-2012, 02:19 AM Go to last post
  39. Tukey Boxplot

    I am calculating outliers for a data set using the Tukey Boxplot. The "problem" is that I have only 25-30 organizations (cases) in the analysis. I am...

    Started by noetsi‎, 07-30-2012 10:46 AM
    • Replies: 1
    • Views: 1,275
    07-30-2012, 11:41 AM Go to last post
  40. Backtesting trading strategy

    Dear TalkStats user, I am testing a trading strategy that I built using Matlab. I tested the strategy on the AEX (Dutch Stock Exchange) from 2000...

    Started by JelleJansen‎, 07-22-2012 01:07 PM
    • Replies: 0
    • Views: 2,785
    07-22-2012, 01:07 PM Go to last post
  41. Influence of time series on time series.

    I am trying to determine if changes over time in unemployment and the severity of injury influences change in placement of workers (and which is...

    Started by noetsi‎, 07-20-2012 02:54 PM
    • Replies: 0
    • Views: 2,080
    07-20-2012, 02:54 PM Go to last post
  42. Beneficial betting strategy?

    What is a good betting strategy? The strategies I've examined are: Kelly; Kelly0.5; Kelly 0.25; constant betting; constant betting proportional to...

    Started by Englund‎, 07-19-2012 12:06 PM
    • Replies: 0
    • Views: 4,558
    07-19-2012, 12:06 PM Go to last post
  43. statistical test

    Hi everybody, i'm new here and i don't have much experience with statistics. I have an experiment and i've changed a parameter (N), than I've got...

    Started by gui‎, 07-18-2012 11:35 PM
    • Replies: 0
    • Views: 1,779
    07-18-2012, 11:35 PM Go to last post
  44. VAR model:changing the vector with the constants

    Hello, My name is Simon and currently I'm workin on a Vector Autoregressive model to simulate interest rates. The inputs are the parameters...

    Started by simonh‎, 07-18-2012 09:40 AM
    • Replies: 0
    • Views: 1,853
    07-18-2012, 09:40 AM Go to last post
  45. One observation - 2 normal distributions

    I've got an observation (1 person, name and a small geographical area) with an unknown age that is normally distributed as a function of both name...

    Started by alp‎, 07-18-2012 07:21 AM
    • Replies: 1
    • Views: 1,455
    07-18-2012, 08:42 AM Go to last post
  46. what kind of analysis to use? regression, MANOVA, panel data analysis???

    Hi, Im an undergrad student doing some research on the effects of financial crisis of 2007 2008 on firms. I have data from 2005 to 2010 for over...

    Started by jurgen57‎, 07-10-2012 10:16 AM
    • Replies: 2
    • Views: 2,101
    07-16-2012, 05:36 PM Go to last post
  47. Random Walk

    Hi guys, I am working on the following problem related to random walks. I have a set of data as a simple random walk starting at t=0, after...

    Started by milinow‎, 06-28-2012 03:12 PM
    • Replies: 3
    • Views: 2,046
    07-16-2012, 04:22 PM Go to last post
  48. Correcting a prediction.

    At work, I've produced a curve that will predict my net loss on a portfolio of accounts over 50 months. However the curve is not very sophisticated,...

    Started by b4d_k42ma‎, 07-03-2012 08:38 AM
    • Replies: 0
    • Views: 2,098
    07-03-2012, 08:38 AM Go to last post
  49. Finding important correlations

    I have a question that relates to a project I've been assigned at work. I am supposed to analyze accounts that we have had in the past to determine...

    Started by gryffin13‎, 06-27-2012 10:05 AM
    analyze, correlation, find, important, pattern
    • Replies: 1
    • Views: 1,692
    07-03-2012, 08:14 AM Go to last post
  50. STD DEV Question

    I hope this is the right place to post this and my apologies if I make no sense and/or this is such an easy question I have 3 Mutual Funds that I...

    Started by mdfmcf‎, 07-02-2012 04:49 PM
    • Replies: 0
    • Views: 1,407
    07-02-2012, 04:49 PM Go to last post
  51. After the results of Co-integration test

    Hi everyone I am facing the following problem. If any one know, please help me. I have 12 variables in one equation. Three are stationary at...

    Started by alim‎, 06-25-2012 09:13 AM
    • Replies: 0
    • Views: 1,613
    06-25-2012, 09:13 AM Go to last post
  52. Varied examples of analysis reports?

    Can anyone here please give URLs of websites with good examples of various data analysis reports? I'm often asked to do unique analysis projects,...

    Started by SlideRule‎, 06-17-2012 10:48 AM
    • Replies: 0
    • Views: 2,181
    06-17-2012, 10:48 AM Go to last post
  53. Dependence between 2 distributions

    Hi all. Is there any way to test for dependence for 2 distributions. Also, can you recommend a good graphical aid to communicate the dependence...

    Started by sampahmel‎, 06-16-2012 06:30 PM
    • Replies: 0
    • Views: 1,483
    06-16-2012, 06:30 PM Go to last post
  54. Combine Results from a number of sampled datasets

    I am a computer science PhD student. I believe the question I am posing should be trivial to the stats students so bear with me I have a data set...

    Started by OSUGuy‎, 06-14-2012 09:35 PM
    dataset error sampling
    • Replies: 4
    • Views: 1,967
    06-14-2012, 10:03 PM Go to last post
  55. What significance test should I use?

    Hi, I am at a bit off a loss with a project I am working on as my statistics are a very rusty! I've had a look through a few old...

    Started by jamiec86‎, 06-13-2012 04:42 PM
    • Replies: 0
    • Views: 1,633
    06-13-2012, 04:42 PM Go to last post
  56. VAR model

    Hi , i need a help :) i conducted a VAR model using e-view program after choosing the suitable lag length i re estimate the VAR ,so i got ...

    Started by Elie‎, 06-11-2012 03:31 PM
    • Replies: 13
    • Views: 3,481
    06-13-2012, 02:28 PM Go to last post
  57. Compute score from variance or correlation coefficient?

    Greetings, Im seeking inspiration in creating a scoring (figure of merit) function that can evaluate how close a set of parallel measurements are...

    Started by Spark‎, 06-11-2012 11:50 PM
    correlation coefficient, error, measurements, score, variance
    • Replies: 1
    • Views: 3,123
    06-12-2012, 09:42 PM Go to last post
  58. Significance testing between ratios

    Hi, I'm working with employment data to compare my local region with Pennsylvania's employment as a whole. I'd like to determine whether...

    Started by trwib‎, 06-11-2012 09:56 AM
    ratio, significance test
    • Replies: 3
    • Views: 6,662
    06-12-2012, 07:54 AM Go to last post
  59. Emergency - A quantitative criterion for judging the degree of spectral fragmentation

    Greeting, My name is Pooria, an Optical Telecommunications student. I have been working on Flexible Bandwidth Optical Networks since 2009....

    Started by Pooria‎, 06-11-2012 09:10 AM
    • Replies: 0
    • Views: 1,425
    06-11-2012, 09:10 AM Go to last post
  60. Determining the winner between two pricing strategies

    I'd like to conduct an A/B split test of pricing strategies on two web pages, and I'd like to know when to stop the test and declare the leader as...

    Started by CharleyKyd‎, 06-09-2012 09:44 PM
    a/b split test, excel, price testing
    • Replies: 1
    • Views: 1,537
    06-09-2012, 10:36 PM Go to last post

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