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Forum: Applied Statistics

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

  1. repeated ANOVA 3, correlation between sd and mean = problem ?

    hi all, here the problem : I have 16 experimental conditions (3 factors => 4*2*2 lvl) and 14 subjects (n=14). dependent variable = reaction...

    Started by ++Manu++‎, 05-12-2010 07:26 AM
    • Replies: 0
    • Views: 2,426
    05-12-2010, 07:26 AM Go to last post
  2. Interaction and post-hoc

    Hi all, Can we use post-hoc test on main effects and interaction effects or main effects only ? Considere a two-way ANOVA with a factor with 6...

    Started by ++Manu++‎, 11-04-2010 10:51 AM
    • Replies: 0
    • Views: 3,040
    11-04-2010, 10:51 AM Go to last post
  3. bias in arithmetic averages

    i have been reading Mackinsey valuation textbook and they mentionned 2 points that puzzled me: 1- arithmetic average (they were talking about the...

    Started by 12345678‎, 02-26-2011 09:38 AM
    • Replies: 0
    • Views: 2,100
    02-26-2011, 09:38 AM Go to last post
  4. Reasoning behind comparing variance between and within for Anova?

    I looking for some logic reasoning behind why ANOVA test uses σ2 given by these to variables. Why??

    Started by 216‎, 01-02-2015 05:16 PM
    • Replies: 1
    • Views: 1,693
    01-03-2015, 12:01 PM Go to last post
  5. Creating Fischer Chain

    Hello, I have GDP nominal and real data. The real data varies from certain periods in base year. I'm attempting to chain with a Fischer index. I...

    Started by 7e1cbf8b25‎, 05-12-2016 08:58 PM
    • Replies: 0
    • Views: 1,178
    05-12-2016, 08:58 PM Go to last post
  6. Help with sampling for climate change project

    Hi, sorry if this is in the wrong section, but i couldn't find any better to suit!!! I am writing my dissertation on basically along the lines of...

    Started by 98107‎, 09-19-2011 11:24 AM
    • Replies: 1
    • Views: 1,933
    09-19-2011, 11:55 AM Go to last post
  7. 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: 2,042
    05-16-2014, 10:32 PM Go to last post
  8. Need ideas for framework for relationship between time-based events and attrition

    I'd like to be able to find a relationship between automatic problem reports and customer attrition in an online service. When a customer...

    Started by aaronnonlinear‎, 10-07-2013 09:17 PM
    • Replies: 1
    • Views: 1,419
    10-08-2013, 08:43 AM Go to last post
  9. Cluster analysis or supervised classification?

    Hi, I have a 1.000 observations with 10 attributes (of different types: numeric, dicotomic, ecc..) and a measure to calculate for each one. I...

    Started by abanero‎, 05-25-2010 11:08 AM
    • Replies: 12
    • Views: 6,089
    08-26-2010, 09:25 AM Go to last post
  10. Combining parameter estimates from many numerical simulations

    My goal is to determine through numerical simulations the prospects of measuring 2 parameters p1 and p2 by fitting a model to data. Assuming the...

    Started by abecity23‎, 08-24-2010 12:47 PM
    • Replies: 1
    • Views: 3,455
    08-24-2010, 11:23 PM Go to last post
  11. Applying Credible Intervals vs Confidence Intervals

    Hi all, Struggling through a problem at work, and we are slogging through an internal debate. We are not statisticians and rapidly finding the...

    Started by abgtr‎, 02-26-2015 02:24 AM
    • Replies: 0
    • Views: 1,323
    02-26-2015, 02:24 AM Go to last post
  12. using Statistical methods to solve a business problem

    Hi, i need to do a project on "using Statistaical methods to solve a business problem" ...plz provide some ideas and help

    Started by abrakadabra‎, 12-14-2013 03:02 AM
    • Replies: 1
    • Views: 1,503
    12-17-2013, 10:20 AM Go to last post
  13. Statistical inference

    Hi there, I would like to ask a couple of basic questions: 1. What is the difference between estimation and hypothesis testing? I mean are they...

    Started by Abubaker‎, 01-08-2017 05:06 AM
    applied statistics, estimation, hypothesis testing, inference, model selection
    • Replies: 0
    • Views: 2,304
    01-08-2017, 05:06 AM Go to last post
  14. Goodness of fit tests

    Hi there, Adding to my previous questions: 1. Why do I need goodness of fit test? I mean when I get a set of data should I always suggest a...

    Started by Abubaker‎, 01-08-2017 06:21 AM
    goodness of fit, hypothesis testing, modeling techniques
    • Replies: 0
    • Views: 2,972
    01-08-2017, 06:21 AM Go to last post
  15. data points and correlation result

    Hi Guys First I hope that my question is in the right place and that it's been a while since i've been doing stats. Recently I've found the...

    Started by abu_stats‎, 02-08-2013 04:49 AM
    • Replies: 5
    • Views: 1,758
    02-08-2013, 03:23 PM Go to last post
  16. Unhappy Functions of Random Variable.

    Let X be exponential(lambda), and let Y=max(1,X). Find the cdf of Y. Also sketch the cdf. Suppose that X is discrete with pmf p(0)=p(1)=2p(2) (and...

    Started by Actuarial_Deepika‎, 01-30-2011 01:41 AM
    cdf, exponential, pmf, random variable
    • Replies: 1
    • Views: 4,460
    01-30-2011, 02:39 AM Go to last post
  17. Comparing two samples of volatility data: Some complications

    Hi guys, I'm having some problems establishing the best possible test for a comparison of two samples. Background: I'm investigating the...

    Started by AcuteApathy‎, 03-03-2015 06:02 AM
    comparisons, finance, volatility
    • Replies: 0
    • Views: 1,872
    03-03-2015, 06:02 AM Go to last post
  18. Repeated Measures Anova for Analyzing Number or Errors

    I am trying to analyze the data for a study in which participants responded to a briefly presented stimuli in the form of a red light during a series...

    Started by Acutegrl‎, 08-26-2010 06:57 PM
    • Replies: 0
    • Views: 2,261
    08-26-2010, 06:57 PM Go to last post
  19. small sample size

    hi everybody. i need your help urgently... in my resource i need to measure a distribution for a Certain metal property (microscopic property)....

    Started by adam2649‎, 05-19-2015 05:06 AM
    • Replies: 11
    • Views: 1,686
    05-28-2015, 05:21 PM Go to last post
  20. Parameter finding - can you give me a basic guide?

    Hey there, I started working with a detector, and I was asked to model the efficiency of this it. I have collected lots of data about the...

    Started by AdamHunyadi‎, 06-21-2016 05:38 AM
    datasets, parameter estimation, simulation
    • Replies: 2
    • Views: 1,439
    06-21-2016, 09:30 AM Go to last post
  21. HELP! Probability That Any Book May Be Read

    I have a question and I'm hoping people can impart some wisdom to my dilemma. My dilemma is lack of data to apply to this problem. The question I'm...

    Started by adangerchen‎, 01-23-2016 12:11 AM
    applied statistics, data generation, probability
    • Replies: 2
    • Views: 1,746
    01-23-2016, 12:23 PM Go to last post
  22. what to do after a chi≤ test

    hey, i compared the frequency of samples containing zero pupa vs samples containing at least one pupa in different stations. i carried out a chi≤...

    Started by adrienbaudouin‎, 06-25-2010 09:10 AM
    • Replies: 3
    • Views: 144,844
    06-26-2010, 12:49 PM Go to last post
  23. Standard deviatiom of percentage changes

    Hi all, I need to calculate de standard deviation of a percentage changes time series. This time series shows the changes in sales versus the same...

    Started by afabris‎, 04-16-2015 09:20 AM
    • Replies: 0
    • Views: 1,334
    04-16-2015, 09:20 AM Go to last post
  24. EIS instrumental variables

    Hi guys, I am running a simple IV regression model to test whether the coefficient of EIS is equal to 1. I was wondering if anyone knew an...

    Started by Ageo7836‎, 05-19-2011 08:42 PM
    • Replies: 2
    • Views: 3,389
    12-10-2011, 05:33 PM Go to last post
  25. Dealing with treatment variable that is both ordinal and categorical

    I am dealing with an issue related to a study of 4 treatment groups, which were randomly assigned to a specific population, however due to...

    Started by agsalomon‎, 12-31-2011 02:47 AM
    • Replies: 1
    • Views: 2,982
    01-04-2012, 02:56 PM Go to last post
  26. zero censored data, but real positive and negative values

    I am working with a dependant variable which includes many observations that are censored at 0 (meaning they do not engage in the process determining...

    Started by agsalomon‎, 02-19-2014 02:24 AM
    • Replies: 0
    • Views: 1,187
    02-19-2014, 02:24 AM Go to last post
  27. Tailed linear regression - Interpretation

    Dear all, I would appreciate a lot if you could help me. I donīt know exactly if it is possible to Interpret correctly with the following results...

    Started by Agua‎, 09-01-2013 04:57 AM
    • Replies: 5
    • Views: 1,994
    09-04-2013, 11:25 AM Go to last post
  28. Recruitment Discrimination

    Hi, I did stats years ago and am now quite rusty. At work we're looking at a straight forward problem: how to demonstrate we have no...

    Started by agulland‎, 01-28-2011 10:21 AM
    • Replies: 1
    • Views: 2,852
    01-31-2011, 06:12 AM Go to last post
  29. compare two percentages

    Suppose there are 10,000 customers for the company A and 6,000 of them are female. For the company B, there are 8,000 customers and 4,400 of them are...

    Started by aha123‎, 09-28-2011 12:11 AM
    • Replies: 1
    • Views: 2,695
    09-28-2011, 12:29 AM Go to last post
  30. 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
  31. 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
  32. deal with unreliable data points

    This is a Search Engine Marketing question. Suppose I bid 100K keywords in Google. 70K of them have no conversion and many of these 70K have a very...

    Started by aha123‎, 02-01-2013 01:16 AM
    • Replies: 1
    • Views: 2,043
    02-05-2013, 09:51 AM Go to last post
  33. Re: Permanova design for BACI study (using Primer)

    Hello everyone I am a beginner with PRIMER, could anyone help me in designing my PERMANOVA please... I have unbalanced BACI design as following: 2...

    Started by Ahmed Faraj‎, 01-19-2017 03:56 PM
    • Replies: 1
    • Views: 2,655
    01-19-2017, 05:11 PM Go to last post
  34. ChiSquare tests with very large sample size

    Hi all, I have a dataset from a retailer with over 1 million observations and over 100 variables. The outcome variable has 2 levels (Purchase/Not...

    Started by aiteebee‎, 03-24-2016 05:31 AM
    • Replies: 6
    • Views: 2,570
    03-25-2016, 04:02 AM Go to last post
  35. Test vs gold standard clumsy doubt

    Hello everybody, I want to know if a test I'm working in has a good sensitivity and specificity (compared with a gold standard test), but I am not...

    Started by AJLRB‎, 06-26-2017 02:14 AM
    • Replies: 5
    • Views: 664
    06-27-2017, 08:04 AM Go to last post
  36. Messy methodology design

    Hello everybody, Let's see if I can sum up the problems I'm facing in a study I am working in since I'm quite new to statistics and thigs are...

    Started by AJLRB‎, 07-17-2017 01:47 AM
    • Replies: 3
    • Views: 617
    07-17-2017, 03:22 PM Go to last post
  37. Converting the payoff from brackets to table format

    Hi all, I'm stuck on a question which includes the following: - there are 3 games: A, B, C - the "favourite" strategy consists of putting £2...

    Started by ajmcal‎, 01-12-2014 05:42 AM
    payoff, probability
    • Replies: 2
    • Views: 1,456
    01-15-2014, 02:49 AM Go to last post
  38. proper distance in cluster with factor variable

    Dear colleagues. I have a group of variables, all of them evaluated from 1 to 5. I want to group the samples with cluster analysis. From different...

    Started by ajui‎, 05-21-2010 05:24 AM
    • Replies: 0
    • Views: 2,296
    05-21-2010, 05:24 AM Go to last post
  39. Unhappy chi square test for various probability distribution

    i want to find out the goodness of fit statistics and p value of various probability distribution by using chi square test. distributions are: 1....

    Started by alam06es‎, 12-08-2015 02:00 AM
    • Replies: 0
    • Views: 1,412
    12-08-2015, 02:00 AM Go to last post
  40. Small distance variability

    Hello everyone. I'm doing research on small distance variability between exploration wells. I have all databases, f.e. gamma-ray in every 10 cm...

    Started by Albek‎, 07-22-2013 03:27 AM
    correlating, statistical research, t-test, variability
    • Replies: 0
    • Views: 1,261
    07-22-2013, 03:27 AM Go to last post
  41. Elo ratings in games

    I've just recently started getting 'into' stats, at a very basic level, but am becoming ever more curious. Another interest of mine is videogames,...

    Started by Albi13‎, 09-07-2011 10:32 AM
    elo, games, ranking
    • Replies: 0
    • Views: 3,055
    09-07-2011, 10:32 AM Go to last post
  42. Smile Need your help on my "model". Look look look!

    Brief introduction: I work at Loyds Industri AS, and come fresh out of school. Loyds have over the past three years spent around $4M on developing a...

    Started by aleksaah‎, 01-16-2013 11:17 AM
    • Replies: 0
    • Views: 1,887
    01-16-2013, 11:17 AM Go to last post
  43. Forcast changes in th failure rate while considering feedback loop of failed "entity"

    Hi there How would you forecast changes in the failure rate of an assembly line if failed modules are fed back into the assembly line? If a...

    Started by Alex2605‎, 01-18-2017 11:23 AM
    assembly process, failure rate, feedback loop
    • Replies: 0
    • Views: 2,200
    01-18-2017, 11:23 AM Go to last post
  44. individual-level random effects and the idiosyncratic error

    Can anyone explain how some of the explanatory variables could be correlated with individual-level random effects, but that none of the explanatory...

    Started by Alexander8‎, 04-03-2015 07:11 PM
    • Replies: 0
    • Views: 1,038
    04-03-2015, 07:11 PM Go to last post
  45. Seek for Statistical Test of Variability Contribution Percentage of Multiple Factors

    Hi, I need statistical test which would tell me which percent of variability in dependent variable is from given independent set of variables and...

    Started by Alexei Nomazov‎, 08-14-2016 10:07 AM
    anova, factor analysis, statistical methods, statistical test, variability
    • Replies: 3
    • Views: 2,665
    08-15-2016, 07:36 AM Go to last post
  46. Automatic determination of pump operation mode

    Hi everybody, I have a data set with pump speed data measured every hour for the period of several months. I have attached the file with the pump...

    Started by AlexeyY‎, 12-07-2015 12:14 AM
    • Replies: 0
    • Views: 1,608
    12-07-2015, 12:14 AM Go to last post
  47. Cluster with unknown number of sampling units?

    I work on survey data which are usually collected through muti-stage cluster sampling. I am used to seeing clusters as geographically defined groups...

    Started by alexirani‎, 11-30-2016 07:36 AM
    • Replies: 0
    • Views: 2,311
    11-30-2016, 07:36 AM Go to last post
  48. 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: 4,516
    09-05-2012, 01:27 PM Go to last post
  49. 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
  50. Correlations between dependent timeseries

    Dear all, I am a beginner regarding statistics and I would like to ask you the following question (after looking everywere on the internet but not...

    Started by almar‎, 01-05-2011 03:43 AM
    • Replies: 0
    • Views: 2,880
    01-05-2011, 03:43 AM Go to last post
  51. how to calculate median of grouped data if group size is variable

    I learned in school that Median = L + (n/2-cf)*h/f where L = lower limit of median class n = no. of observations cf = cumulative...

    Started by alokmahor‎, 11-06-2011 12:40 PM
    grouped data, median
    • Replies: 0
    • Views: 2,827
    11-06-2011, 12:40 PM Go to last post
  52. 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
  53. URL traffic

    Hi! I'm doing an piece of work which I need a bit of perspective on. I have been given two datasets; one containing 33,000'ish URLs and their...

    Started by alphonse2016‎, 10-22-2016 05:38 AM
    • Replies: 0
    • Views: 2,237
    10-22-2016, 05:38 AM Go to last post
  54. Three people checking

    This is my first post so please forgive me if I have posted this in the wrong forum or if this is simple and has already been answered somewhere...

    Started by alsdhf‎, 11-07-2017 07:48 AM
    • Replies: 0
    • Views: 114
    11-07-2017, 07:48 AM Go to last post
  55. Is it appropriate to not compare all samples and rather 2 of them and another 2?

    Iím preparing within a group repeated measures study with duration of 3 weeks. 1st week - no technique is applied, itís a control group, 2nd week -...

    Started by Alyona‎, 05-27-2017 02:21 AM
    • Replies: 0
    • Views: 871
    05-27-2017, 02:21 AM Go to last post
  56. Help with economics question

    Hi, first time user. I am having trouble with a question and I just wanted some hints/pointers as to how to solve it. Suppose you have a...

    Started by amateurstudent101‎, 04-20-2010 03:07 AM
    • Replies: 1
    • Views: 2,669
    06-16-2010, 02:57 PM Go to last post
  57. 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: 1,655
    07-10-2014, 12:15 AM Go to last post
  58. 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: 2,622
    07-17-2014, 08:21 PM Go to last post
  59. Talking STATA - Regression with decreasing sample + save t-statistics

    Hi all, I am working with the following data: stick year q diff_unemploy 2.03 1975 1 0.031 1.28 1976 1 -0.005 0.92 1977 1 -0.002...

    Started by amazon‎, 08-04-2014 12:10 AM
    stata regress save t-stat
    • Replies: 1
    • Views: 2,275
    08-06-2014, 02:07 AM Go to last post
  60. Smile MATLAB: Reshape nested structure and export it to Excel - Panel Data - Financial Time

    I am working with a nested structure with multiple fields, each field is a Nx1 vector (cell and double). {Ticker Date Open High Low Close Volume...

    Started by amazon‎, 08-25-2014 07:30 AM
    • Replies: 1
    • Views: 2,770
    09-04-2014, 11:43 AM Go to last post

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