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Forum: Applied Statistics

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

  1. Advice on comparative analysis between two groups on Likert scale questionnaire

    Hi everyone, I'm stuck on my dissertation which is due next week. I'm a business major student and my project is a comparative research on corporate...

    Started by Frankfoot‎, 06-02-2012 08:03 AM
    liker scale, likert interpretation, statistical analysis, statistical research
    • Replies: 0
    • Views: 2,715
    06-02-2012, 08:03 AM Go to last post
  2. Forecasting MTBUR based on past performance

    Hi there! I came across a scenario recently that I think the logistics team I am interning with is approaching the problem incorrectly, but I am...

    Started by tennispolska‎, 06-01-2012 09:28 AM
    estimation, forecast, mtbur, statistics
    • Replies: 0
    • Views: 3,290
    06-01-2012, 09:28 AM Go to last post
  3. Advise on what analysis should be done

    I want to determine the effect of weekly promotions(basically the percentage increase in sales due to promotions) on different units in an...

    Started by Lan‎, 05-24-2012 02:39 AM
    • Replies: 0
    • Views: 2,017
    05-24-2012, 02:39 AM Go to last post
  4. time series analysis-cross prediction

    Dear All, What is cross prediction and how we use it? So far I understood is that assume we have 10 stores and their sales are given for each 24...

    Started by masarimk‎, 05-23-2012 10:14 AM
    • Replies: 0
    • Views: 1,993
    05-23-2012, 10:14 AM Go to last post
  5. Question 2-WAY ANOVA - with only means, SD & sample size

    Hello all. I hope this is the correct forum for this query - my apologies if best placed elsewhere. As part of my doctoral research I'm looking to...

    Started by chrisjames511‎, 05-21-2012 12:03 PM
    • Replies: 3
    • Views: 10,575
    05-22-2012, 04:30 AM Go to last post
  6. Useful time series books

    The one I have is 1) completely theoretical rather than applied and 2) uses a great deal of terminology and equations I have not encountered. So I am...

    Started by noetsi‎, 05-15-2012 10:16 AM
    • Replies: 4
    • Views: 3,917
    05-15-2012, 02:01 PM Go to last post
  7. Question Which situations do I use that Bonferrei correction?

    I have some problems with Bonferroni correction, which situations should I use? I did not understand exactly. I'm using one-way Manova and...

    Started by boraokur44‎, 05-07-2012 01:06 PM
    • Replies: 9
    • Views: 3,591
    05-15-2012, 01:35 PM Go to last post
  8. Seemingly simple problem of t-tests

    Hi, this problem that I have easily generalizes, but I will simply use two students for an example. We see two students. S1 and S2. One of them...

    Started by tzuohann‎, 05-11-2012 01:12 AM
    • Replies: 0
    • Views: 2,024
    05-11-2012, 01:12 AM Go to last post
  9. PCA standard deviation

    How is the standard deviation of the principal components calculated? I thought it was the sum of square root of the values in each PC, but this...

    Started by RogerF‎, 05-09-2012 12:29 PM
    • Replies: 0
    • Views: 2,214
    05-09-2012, 12:29 PM Go to last post
  10. Hamilton filter

    Hi guys . I will be needing Hamilton's filter in my master thesis but after reading his chapter 22 from 94 Time Series analysis i have to say i am...

    Started by Spook‎, 05-07-2012 01:42 PM
    • Replies: 0
    • Views: 2,300
    05-07-2012, 01:42 PM Go to last post
  11. ANOVA One-way Vs Factorial ANOVA. Discordant results. Help

    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, 05-07-2012 09:33 AM
    anova, factorial anova, one way, two way
    • Replies: 0
    • Views: 3,156
    05-07-2012, 09:33 AM Go to last post
  12. Portfolio returns

    Hi, I have a portfolio of about 50 stocks from which I have picked about 4-8 stocks each year to see whether they perform better than the 50...

    Started by fiha09ac‎, 05-07-2012 04:39 AM
    • Replies: 0
    • Views: 1,403
    05-07-2012, 04:39 AM Go to last post
  13. Social Network Analysis: anyone here familiar with it ?

    Hi All, I have no specific question. I am just wondering (in case of future needs) if is there here in the forum anyone familiar with Social...

    Started by gianmarco‎, 04-13-2011 01:16 PM
    • Replies: 5
    • Views: 5,313
    05-06-2012, 04:13 AM Go to last post
  14. Order Statistics Problem

    Hi there I have random variables X1,X2,X3,...,XN which are I.I.D. Each of these random variables are Erlang Distributed. X=min{X1,...,XN}. Now the...

    Started by Bhekisizwe‎, 05-05-2012 03:35 AM
    cdf, order statistics, pdf
    • Replies: 0
    • Views: 1,757
    05-05-2012, 03:35 AM Go to last post
  15. correlation and time series data

    Hello, I intend to compute the correlation (Pearson's correlation) for two stock indices. The stock index are time series data - about 10 years...

    Started by manoa‎, 05-03-2012 05:22 PM
    • Replies: 0
    • Views: 1,534
    05-03-2012, 05:22 PM Go to last post
  16. Uknown Statistical function in Inventory System

    I have a function below used for forecasting and smoothing of consumption values for an inventory model. I want to know which type of function is...

    Started by MubeenMalik‎, 05-03-2012 02:52 AM
    • Replies: 0
    • Views: 1,878
    05-03-2012, 02:52 AM Go to last post
  17. Coins problem

    A jar contains 15 pennies and 30 quaters. Suppose that you randomally grab ten coins from the jar. What is the probability that you get exatly...

    Started by french‎, 05-03-2012 02:45 AM
    • Replies: 0
    • Views: 1,877
    05-03-2012, 02:45 AM Go to last post
  18. Help Homework problem

    Ten percent o fAmerican adults are left-handed. A statistics class has 25 students in attendance. Would it be unusual to survey a class of 25 and...

    Started by zaku‎, 05-02-2012 11:31 PM
    • Replies: 4
    • Views: 5,381
    05-03-2012, 02:09 AM Go to last post
  19. Stats Problem

    On average, there are three misprints in every 10 pages of a particular book. If every chappter of the book contains 35 pages, what is the...

    Started by gijin‎, 05-03-2012 12:00 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,628
    05-03-2012, 01:45 AM Go to last post
  20. Almost Ideal Demand System Question

    Can I use prices which are consumer price indexes within the almost ideal demand system? thanks!

    Started by dannylimstata‎, 04-28-2012 10:20 PM
    • Replies: 1
    • Views: 2,179
    04-28-2012, 10:35 PM Go to last post
  21. Do this graph has an interaction?

    Hi, Thank you so much for reading this I am facing difficulty in interpreting this graph. I am doing 2 by 2 factorial design. Factor A and factor...

    Started by maria209‎, 04-14-2012 01:47 AM
    • Replies: 7
    • Views: 3,202
    04-27-2012, 02:13 PM Go to last post
  22. What are Collinear Prices?

    I keep hearing references to collinear prices within this research paper. http://epubs.surrey.ac.uk/1124/1/fulltext.pdf any ideas?

    Started by dannylimstata‎, 04-26-2012 07:15 PM
    • Replies: 1
    • Views: 2,708
    04-26-2012, 07:36 PM Go to last post
  23. Red face ANOVA? PLEASE HELP :) im so confused

    Hello :wave: , I think of ANOVA analysis as being useful when we want to see if there is a significant difference between the means of levels....

    Started by mili‎, 04-07-2012 05:30 PM
    anova, excel, variable
    • Replies: 6
    • Views: 2,730
    04-24-2012, 10:20 AM Go to last post
  24. How to rebase monthly CPI Data to a single fixed period?

    I am currently trying to convert some Chinese CPI Data. The data I have ranges from 2001 to 2011 and is monthly. The base period is (Previous Year =...

    Started by dannylimstata‎, 04-24-2012 05:56 AM
    • Replies: 0
    • Views: 3,846
    04-24-2012, 05:56 AM Go to last post
  25. Help identify distribution and estimate CDF (sales and returns)

    I am looking to solve the problem for a case study: The Company sells N units of merchandise over the period of T Some of the units are returned....

    Started by sasha242‎, 04-16-2012 09:17 AM
    • Replies: 3
    • Views: 2,017
    04-22-2012, 03:45 PM Go to last post
  26. Factor Analysis: When to infer that a variable does NOT load on a factor?

    Hi TalkStats! I'm working on a dataset consisting of a survey with 18 questions (items). There are 6 underlying factors, and I'm pretty sure that...

    Started by cotillion‎, 04-21-2012 08:13 AM
    • Replies: 2
    • Views: 2,665
    04-22-2012, 04:41 AM Go to last post
  27. Help with discriminant analysis

    Hi. I'm working on my dissertation about market of used passenger cars. Using html mining I got about 15000 cases and 80 variables. In university we...

    Started by pajacek‎, 02-26-2012 01:38 PM
    • Replies: 8
    • Views: 2,931
    04-19-2012, 01:49 PM Go to last post
  28. Correlation between two matrices of spatial signals?

    Hi, I'm trying to obtain a measure of how similar two matrices are. Each is a representation of the level of a variable (say A and B respectively)...

    Started by M.Grace‎, 04-16-2012 10:27 AM
    • Replies: 1
    • Views: 2,533
    04-19-2012, 01:41 PM Go to last post
  29. forecasting method

    Please I wanted to determine forecasted prices of coton which are as follow year Prices january...

    Started by euclude‎, 03-13-2012 06:51 AM
    forecasting
    • Replies: 1
    • Views: 1,734
    04-19-2012, 04:11 AM Go to last post
  30. Estimating the number of monthly active users in a website

    Hi everyone, I have this real-world problem that perhaps you'll be able to help me solve. Let's say I operate a website and want to estimate...

    Started by dozo‎, 04-13-2012 07:59 AM
    • Replies: 2
    • Views: 2,706
    04-17-2012, 02:40 PM Go to last post
  31. Support Vector Machine, Recursive Feature Elimination

    I would like to implement the support vector machine-recursive feature elimination algorithm to a biomedical dataset. I am a beginner in machine...

    Started by mada2009‎, 04-09-2012 02:43 PM
    • Replies: 0
    • Views: 2,441
    04-09-2012, 02:43 PM Go to last post
  32. Age-Adjusted Mortality Rates

    Okay, so I had originally been concerned with why my age-adjusted all-cause mortality rates differed from what the CDC's WONDER site provided. I...

    Started by bryangoodrich‎, 07-26-2011 01:38 PM
    • Replies: 3
    • Views: 7,431
    04-02-2012, 08:46 AM Go to last post
  33. Arguments for normal distribution

    Hi I have empirical data for bus inter-arrival times and they follow normal distribution. Tests are OK but I need some arguments to explain in...

    Started by endri81‎, 03-29-2012 07:33 AM
    • Replies: 1
    • Views: 3,558
    03-29-2012, 08:00 AM Go to last post
  34. Smile Back-testing Stock Selection - Data Analysis Help Needed

    Hey everyone! I'm a finance grad and am doing my first big project back-testing some stock selection methods. I have spent the last few weeks...

    Started by unleash‎, 03-29-2012 05:15 AM
    back-test, economics, finance, stock-selection
    • Replies: 0
    • Views: 1,864
    03-29-2012, 05:15 AM Go to last post
  35. Question PCA on forest carbon production

    Hey, I am new to this forum and would like to say thanks in advance to anyone who replies to this message. I have tried thoroughly to discover the...

    Started by thedummyatstats‎, 02-22-2012 01:16 PM
    carbon, forest, nep, pca, principle component
    • Replies: 3
    • Views: 2,715
    03-24-2012, 12:10 PM Go to last post
  36. A time-variant dummy in a panel data model?

    Okay, I've got a model of the form: \displaystyle y_{i,t} = \beta_0 + \beta_1 \ D_{i,t} + Xb + \epsilon_{i,t} Where \displaystyle D_{i,t} = 1...

    Started by eBopBob‎, 03-22-2012 04:43 PM
    • Replies: 0
    • Views: 3,905
    03-22-2012, 04:43 PM Go to last post
  37. PCA on time series

    Hi, excuse my poor english... I need to reduce number of indicators (and to perform a PCA) on dataset: year ind(1) ind(2) ... ind(n) 2000 x(1,1)...

    Started by battlestar‎, 03-08-2012 03:13 AM
    • Replies: 2
    • Views: 5,964
    03-17-2012, 06:58 AM Go to last post
  38. HLM residuals

    One test reccomended to check the assumptions of HLM is to plot the first level residuals against a predictor (here a time predictor). They should be...

    Started by noetsi‎, 03-06-2012 07:46 PM
    • Replies: 2
    • Views: 2,973
    03-07-2012, 02:01 PM Go to last post
  39. Principle Component Regression

    Can someone please offer tutorial or formula on transforming the constant and coefficients from a principle component regression back into the...

    Started by forest888‎, 12-22-2011 04:56 PM
    • Replies: 12
    • Views: 6,153
    03-06-2012, 09:56 PM Go to last post
  40. Help with a homework question

    Here is the information: Assume heights of women follow the normal curve with a mean of 63.4 inches and a standard deviation of 2.58 inches. ...

    Started by EonsNearby‎, 03-04-2012 11:18 AM
    • Replies: 1
    • Views: 1,747
    03-04-2012, 11:49 AM Go to last post
  41. Breakpoint Test..Help please!!

    Hello I need to carry a breakpoint test to know the date at which returns/prices of stocks from S&P were affected during the subprime crisis of...

    Started by Redlotus‎, 03-02-2012 03:00 AM
    • Replies: 0
    • Views: 2,062
    03-02-2012, 03:00 AM Go to last post
  42. ANOVA/One Sample t test question

    It has been too long since I studied this....:shakehead I have a statewide variable which can be split into 6 regions (that is the the statewide...

    Started by noetsi‎, 03-01-2012 10:21 AM
    • Replies: 2
    • Views: 2,936
    03-01-2012, 06:28 PM Go to last post
  43. Idea (probably not new) about a metric for comparing forecast errors across settings

    Hi there, I had written a large post, but was kicked off upon submitting, so I will keep this post to minimum... What are your views of the...

    Started by BigBugBuzzz‎, 03-01-2012 04:42 AM
    errors, forecast, metrics, settings
    • Replies: 0
    • Views: 1,181
    03-01-2012, 04:42 AM Go to last post
  44. Lightbulb 1-way or 2-way ANOVA for an experiment using 2 lab machines

    Hi I have a data set of experimental data comparing 3 different loads on idendital bars - 1-way ANONA ? I also wish to compare this data with...

    Started by jarvis‎, 02-29-2012 09:18 AM
    • Replies: 0
    • Views: 1,933
    02-29-2012, 09:18 AM Go to last post
  45. Calling the power of statistics to help evaluate our marketing!

    Hi all, Brief introduction: I work as an analyst @ a tech startup, industrial engineer grad. I've had some statistics coursework, but have a...

    Started by cbenkendorf‎, 01-26-2012 06:04 PM
    • Replies: 6
    • Views: 3,470
    02-27-2012, 04:23 AM Go to last post
  46. Venture Capital methodology

    Hi, and apologies beforehand of what might become a wall of text. We are working on a project to define value drivers in VC-firms, where we might...

    Started by stinestalker‎, 02-23-2012 11:45 AM
    cash flow, finance, multiple regression, venture capital
    • Replies: 0
    • Views: 2,612
    02-23-2012, 11:45 AM Go to last post
  47. Calculating true negatives with many classes

    Hello, I'm doing market basket analysis, using the Apriori algorithm, and I was asked to plot the ROC curve to demonstrate the effectiveness of...

    Started by JohnDoe1337‎, 02-22-2012 09:20 PM
    • Replies: 0
    • Views: 1,347
    02-22-2012, 09:20 PM Go to last post
  48. Uncertainty in Standard Deviation

    The 95% confidence intervals for the standard deviation (SD) of 5 measurements is approximately 0.6*SD to 2.87*SD. The measurements are laser...

    Started by laser‎, 02-21-2012 06:58 PM
    average, confidence interval, standard deviation, uncertainty
    • Replies: 0
    • Views: 2,030
    02-21-2012, 06:58 PM Go to last post
  49. Advice on sample frame and sample size

    I'm involved in a 4-yearwater supply, sanitation & hygiene project for mainly pastoralist (nomadic)communities in northern Kenya. We need to conduct...

    Started by andrewo-s‎, 02-09-2012 07:36 AM
    clustering, sample design, sample size
    • Replies: 1
    • Views: 1,836
    02-21-2012, 12:12 PM Go to last post
  50. Number of samples / sub-samples required for students t-test

    I have a batch of material (25kg limestone) which contains low concentrations of several elements. 100 g samples are taken from this batch and...

    Started by ccdean100‎, 02-21-2012 08:16 AM
    sample size, sub-sampling, t-test
    • Replies: 0
    • Views: 1,777
    02-21-2012, 08:16 AM Go to last post
  51. Question on Principal Component Analysis

    I am trying to understand some of the conceptual backgrounds of Principal Component Analysis. I understood how it is measured using Eigenvalues and...

    Started by rajabadsha‎, 02-14-2012 07:31 AM
    • Replies: 1
    • Views: 2,274
    02-15-2012, 08:40 PM Go to last post
  52. Random integers generator....

    Hi I am trying to generate random integers normally distributed. With any software I can generate normal distribution numbers like...

    Started by endri81‎, 02-15-2012 03:08 PM
    • Replies: 1
    • Views: 2,062
    02-15-2012, 03:10 PM Go to last post
  53. What time series model to use?

    Hello! I have a small question that someone would probably know. I want to investigate the effect of a marketing effort (i.e. an introduction of a...

    Started by centaur‎, 02-11-2012 06:32 AM
    • Replies: 0
    • Views: 1,561
    02-11-2012, 06:32 AM Go to last post
  54. P value

    Hi, i have the pre and post results here: pre mean: 4.45 post mean: 7.81 SD:1.562 (pre) and 1.601 (post) sample size: 75 how to make the p...

    Started by esthervoss‎, 02-09-2012 08:41 PM
    • Replies: 10
    • Views: 3,894
    02-09-2012, 10:14 PM Go to last post
  55. Spatio-temporal analysis

    Hi! I'm looking for some basic references recomendations about spatio-temporal analysis. What do you recommend?

    Started by raphaelsaldanha‎, 02-07-2012 07:30 AM
    spatio-temporal analysis
    • Replies: 0
    • Views: 2,169
    02-07-2012, 07:30 AM Go to last post
  56. What analysis should I use?

    I am looking at emergency room visits, specifically at pattern of patients who visit 10 or more times per year. I want to see if there are...

    Started by greg.neyman‎, 02-05-2012 10:20 PM
    • Replies: 6
    • Views: 2,602
    02-06-2012, 05:40 PM Go to last post
  57. Can a new tool detect difference between two means with same effectiveness?

    Hi all, I have two gels of different crosslinking densities (gels A, n = 3, and gels B, n = 3). The gold standard test of substrate MODULUS...

    Started by savana4‎, 01-28-2012 03:10 PM
    engineering, validation
    • Replies: 0
    • Views: 2,270
    01-28-2012, 03:10 PM Go to last post
  58. How to calculate probability of a failure for Reliability theory (Exponential dist)?

    Lets talk Reliability theory, failure rates, MTBF, etc. We are going to assume single-point failure (no redundancy), and the exponential...

    Started by Bullethead‎, 01-26-2012 11:56 AM
    • Replies: 2
    • Views: 29,805
    01-26-2012, 02:23 PM Go to last post
  59. Advice on work plan for statistical analysis

    I have a project that I have to submit a work plan for. We have a training program that we want to evaluate. Some employees have taken the program,...

    Started by dcroft‎, 01-26-2012 05:16 AM
    • Replies: 0
    • Views: 3,582
    01-26-2012, 05:16 AM Go to last post
  60. Mean and Standard Deviation on Different scales?

    What is the reason why someone would take a mean based on a 5 point scale and then change it to a 4 point scale by multiplying by 0.8 and also report...

    Started by jwilliamsoh@hotmail.com‎, 01-19-2012 11:57 AM
    mean standard deviation
    • Replies: 3
    • Views: 6,929
    01-24-2012, 12:44 PM Go to last post

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