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Forum: Applied Statistics

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

  1. Help on analysis of simulation results

    Hello. I am performing simulations on a project (changing durations of activities randomly from lognormal distribution). I perform 100 simulation...

    Started by LiolioG‎, 01-17-2014 09:30 AM
    goodness of fit, simulations, t test, tests of significance
    • Replies: 0
    • Views: 1,136
    01-17-2014, 09:30 AM Go to last post
  2. Time series again

    When you are detrending data (obviously this involves determanistic trends not stocastic ones) do you simply regress the time series versus time and...

    Started by noetsi‎, 01-13-2014 12:14 PM
    • Replies: 6
    • Views: 2,024
    01-15-2014, 04:42 AM Go to last post
  3. Equality of Variance for Paired Data- alternative for Leven's Test?

    Hello, I have set up an experiment that tests 3 instruments on 35 different people. Each person gets tested three times with each instrument (see...

    Started by kingsna1‎, 01-02-2014 02:07 PM
    engineering, equality of variance, levene's test, method comparison
    • Replies: 5
    • Views: 2,131
    01-15-2014, 03:26 AM Go to last post
  4. 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
  5. Exclamation Fix holes in the sales history for forecast preperation

    I have to forecast about +/- 700 products for my company and I am planning on using some kind of smoothing method like Holt-Winter. The problem i...

    Started by ieo228‎, 01-14-2014 12:39 PM
    • Replies: 0
    • Views: 1,185
    01-14-2014, 12:39 PM Go to last post
  6. [Time series models] covariance in MA(1) process

    Hello, the following question is about a stationary MA(1) process (Moving Average of Order 1) - see attached image. Epsilon represents white...

    Started by _sebastian_‎, 01-09-2014 12:47 PM
    • Replies: 7
    • Views: 5,481
    01-09-2014, 01:50 PM Go to last post
  7. Arellano-Bond estimation with autocorrelation

    Hallo everybody, i have been trying to model the impact of volatility in new product introductions on demand volatility. Both variables per se are...

    Started by caligular‎, 01-08-2014 08:05 AM
    • Replies: 0
    • Views: 2,062
    01-08-2014, 08:05 AM Go to last post
  8. algorithm to generate multivariate, non-normal data with missing data patterns

    ok, so here is a more-detailed explanation of my question using an example. vinux and Dason (and everybody else) have been very kind in helping me...

    Started by spunky‎, 01-07-2014 03:01 PM
    • Replies: 1
    • Views: 3,093
    01-07-2014, 03:02 PM Go to last post
  9. Help with Probabilistic Modeling with many elements in simulation with unknown probs.

    1. I'm wanting to create a probabilistic model based on several simulations, where I have a binary outcome (go or no-go) and a variable input. The...

    Started by rocketman‎, 01-06-2014 02:46 PM
    • Replies: 1
    • Views: 1,438
    01-06-2014, 05:46 PM Go to last post
  10. Test for Equality instead of Correlation ?

    Hello, is there a test for checking if x1 = x2 ? Meaning: a test that can tell the difference between x1=1*x2 and x1=2*x2. It should also work...

    Started by stn021‎, 12-15-2013 06:42 AM
    • Replies: 6
    • Views: 2,581
    01-05-2014, 05:47 PM Go to last post
  11. EVT - Mean excess plots / Hill plots

    Hello, I just wanted to know if anyone knew of any good resources (papers/textbooks) in describing Extreme Value Theory. In particular, I want to...

    Started by GTaiko‎, 01-03-2014 10:46 AM
    • Replies: 0
    • Views: 3,826
    01-03-2014, 10:46 AM Go to last post
  12. Model Options

    I have been very busy lately and unable to find time to think about the following analytical project. Given this, I am eliciting feedback and...

    Started by hlsmith‎, 12-30-2013 11:18 AM
    • Replies: 4
    • Views: 1,793
    12-31-2013, 08:34 AM Go to last post
  13. Autoregression Forecasting

    Hi, I have attached a sheet which makes an autoregression forecast. I would appreciate help on one particular cell (I19 of the Regression tab)...

    Started by pcampin‎, 12-26-2013 02:46 PM
    • Replies: 2
    • Views: 1,435
    12-27-2013, 11:57 AM Go to last post
  14. Help identifying appropriate test for statistical significance of event

    My apologies for the title of the post as it is a bit difficult to explain in 50 characters. Here is the situation followed by the goal: ...

    Started by dholzman87‎, 12-26-2013 03:55 PM
    • Replies: 2
    • Views: 1,766
    12-27-2013, 07:43 AM Go to last post
  15. logisitic regression number of fails and success

    Dear All, I am going to run logistic regression and my question is in my model should the number of fails be the same as number of success ? Let's...

    Started by masarimk‎, 12-23-2013 09:28 AM
    • Replies: 6
    • Views: 1,588
    12-25-2013, 10:45 PM Go to last post
  16. Need single percentile conversion for ACT composite scores. Any resources?

    Hi all, I am in need of a conversion scale for ACT scores to percentile that is more granular than what is on the ACT website. Their scale only...

    Started by unlikely economist‎, 12-25-2013 03:38 PM
    • Replies: 0
    • Views: 1,088
    12-25-2013, 03:38 PM Go to last post
  17. ARIMA and differencing of input variables

    Dickey notes in his book on SAS and time series, that you can use explanatory variables in ARIMA (SAS calls these input variables and the way the...

    Started by noetsi‎, 12-20-2013 05:53 PM
    • Replies: 1
    • Views: 1,520
    12-23-2013, 10:55 AM Go to last post
  18. Seasonal stationarity

    I am studying ARIMA and ARIMAX these days . In reading this something occured to me I had not thought of. How is it that you test for stationarity...

    Started by noetsi‎, 11-19-2013 04:19 PM
    • Replies: 2
    • Views: 1,588
    12-23-2013, 10:20 AM Go to last post
  19. Programming a rolling time frame

    Hi! I'm hoping you guys could help me with this. I want to do a rolling time frame with a VAR model. More specifically: I want the VAR model to...

    Started by europeanoption‎, 12-21-2013 05:45 AM
    • Replies: 0
    • Views: 1,508
    12-21-2013, 05:45 AM Go to last post
  20. Modifying an ESM design

    I am running exponential smoothing. We ran projections and now we are comparing the projections to the actual results. One month's actual data was...

    Started by noetsi‎, 12-20-2013 01:59 PM
    • Replies: 1
    • Views: 1,435
    12-20-2013, 02:47 PM Go to last post
  21. Forecasts errors

    There are many ways to look at which model predicts best in time series (exponential smoothing is the one I am focusing on here). MSE, MAPE etc....

    Started by noetsi‎, 12-17-2013 03:48 PM
    • Replies: 0
    • Views: 1,442
    12-17-2013, 03:48 PM Go to last post
  22. 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
  23. churn models

    Dear All, I am working on churn models. My model based on the customers who churned on May-June 2013. The number of churned customers is 30000...

    Started by masarimk‎, 12-16-2013 07:00 AM
    • Replies: 0
    • Views: 1,644
    12-16-2013, 07:00 AM Go to last post
  24. Study of landing go-arounds

    The WSJ recently had an article (http://on.wsj.com/1d9qF1W) about a study of landing go-arounds at SFO and how pilots of foreign airlines have more...

    Started by ihf‎, 12-13-2013 10:01 PM
    • Replies: 0
    • Views: 1,343
    12-13-2013, 10:01 PM Go to last post
  25. Test for invertibility

    I know a variety of methods to find if stationarity has been violated. Does anyone know one for invertability (key for MA in ARMA).

    Started by noetsi‎, 12-13-2013 05:32 PM
    • Replies: 0
    • Views: 1,686
    12-13-2013, 05:32 PM Go to last post
  26. Ordinal variables for use in Confirmatory factor analysis

    Hi Guys I am new here, just signed up and I already need your help ;) I am currently in a situation where i have to conduct a confirmatory factor...

    Started by Demango‎, 12-13-2013 03:46 PM
    • Replies: 1
    • Views: 1,534
    12-13-2013, 04:47 PM Go to last post
  27. Error bars for exponentially distributed data

    Folks, Short version: What is the best and most proper way for displaying error bars on exponentially distributed data? Long version: I have...

    Started by ayekantspehl‎, 12-12-2013 02:27 PM
    error bars, exponential distribution
    • Replies: 2
    • Views: 3,141
    12-13-2013, 03:01 PM Go to last post
  28. Task

    I am student but I have difficulty with one task for homework. 3. Shoe salesman noticed that every month about 10% of the shoes of a producer...

    Started by nasco_h_g‎, 12-11-2013 08:32 AM
    • Replies: 0
    • Views: 1,157
    12-11-2013, 08:32 AM Go to last post
  29. Time series regression [what does this statement mean]

    I ran across this in a discussion of time series regression and it makes no sense to me. It has to do with using hold out data to check the forecasts...

    Started by noetsi‎, 12-10-2013 03:07 PM
    • Replies: 4
    • Views: 1,783
    12-10-2013, 06:52 PM Go to last post
  30. Queuing Analysis

    Hey all, I did a queuing analysis at a local Tim Hortons. For 2hrs me and a group calculated the service times for each customer, the arrivals,...

    Started by bigbob‎, 12-09-2013 10:18 PM
    • Replies: 0
    • Views: 1,803
    12-09-2013, 10:18 PM Go to last post
  31. Correlation between binary and interval data?

    Hi Does anyone know of any measure of correlation that can be used for a binary and an interval variable? A measure that does not assume normal...

    Started by Wendero‎, 12-03-2013 08:52 PM
    • Replies: 11
    • Views: 5,736
    12-09-2013, 08:34 AM Go to last post
  32. Transforming negative data values without losing data relativity

    Hi, I have data that is %change of a measure for 50 people and it has both positive & negative values (some people have +%, some people have -%). I...

    Started by rian‎, 12-06-2013 03:04 PM
    • Replies: 1
    • Views: 1,502
    12-09-2013, 06:28 AM Go to last post
  33. Need to decide what % of the profit I should reinvest, please help!

    Hi everyone, I need your help with this situation for which my untrained brain can't provide a solution. :) I hope I'm posting it in the right...

    Started by Murphatlar‎, 12-05-2013 04:37 PM
    • Replies: 0
    • Views: 1,410
    12-05-2013, 04:37 PM Go to last post
  34. Structural break

    We just totally changed our process - so that past data will not reflect the future at all (to be simple we just stoped taking a large group of...

    Started by noetsi‎, 11-19-2013 05:14 PM
    • Replies: 6
    • Views: 2,193
    12-03-2013, 03:18 PM Go to last post
  35. Assumptions of time series

    I believe, but am not certain, that time series methods which employ regression assume normality and equal error variance. Would you test for these...

    Started by noetsi‎, 10-31-2013 10:27 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 9,237
    12-03-2013, 12:25 PM Go to last post
  36. Determanistic vs Stochastic trend

    Trends may be either determanistic or stochastic in nature and assuming one is the other causes both forecasting and other errors. The trick is...

    Started by noetsi‎, 10-18-2013 05:38 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 10,468
    12-03-2013, 12:12 PM Go to last post
  37. Finding out which data set is near to original one?

    Here is the siuation in which i am stuck ORIGINAL VALUES 6,6,5,5,4,4,4,3,2,2,2,2,1 DATA SET-1 6,5,5,5,5,4,4,4,3,3,2,1,1 DATA SET-2...

    Started by shoaibyaqub‎, 12-01-2013 01:56 AM
    • Replies: 0
    • Views: 1,617
    12-01-2013, 01:56 AM Go to last post
  38. Accuracy and precision in 3D Compare Analysis

    Hi, We have utilized a new scanner that we want to evaluate. To be able to do this, we have used a reference scanner that is state of the art. ...

    Started by Mr.Blue‎, 12-01-2013 01:25 AM
    • Replies: 0
    • Views: 1,261
    12-01-2013, 01:25 AM Go to last post
  39. Finding lambda for Box-Cox transformations for non-statisticians

    I've learned that statisticians are not to be trifled with, because every time I read anything about selecting lambda with the slopes of...

    Started by greg.neyman‎, 07-03-2013 08:55 PM
    • Replies: 3
    • Views: 3,591
    11-24-2013, 09:31 AM Go to last post
  40. Arima

    This is a very different taken on Moving Averages than I have ever seen before (the accounts I have seen before stress a sudden, temporary event at a...

    Started by noetsi‎, 11-20-2013 05:59 PM
    • Replies: 0
    • Views: 1,088
    11-20-2013, 05:59 PM Go to last post
  41. Linearity of time series

    Although I have never worked with these I understand that some time series are non-linear. How would you test for these (I assume this is different...

    Started by noetsi‎, 11-19-2013 09:17 AM
    • Replies: 7
    • Views: 1,866
    11-20-2013, 12:53 PM Go to last post
  42. Duality in linear progamming

    In attachment, first question.. Do I add, I think u call it, slack variable in both equality and inequality, or? What when we have something like...

    Started by mboricgs‎, 11-20-2013 05:55 AM
    • Replies: 0
    • Views: 1,523
    11-20-2013, 05:55 AM Go to last post
  43. Question What analysis to use?

    I'm trying to learn a bit here and I'm experimenting on some data I have available. The data is user records with data appended to each record that...

    Started by jonmrich‎, 11-19-2013 09:06 PM
    analysis method
    • Replies: 0
    • Views: 1,168
    11-19-2013, 09:06 PM Go to last post
  44. PACF for AR(2)

    (Zt)t=Z~WN(0,sigma^2) ,independent equally distributed. Process Xt=SUM(j from 0 to +inf) fi^2j*Zt-2j, teZ satisfies AR(2) equation Xt=fi*Xt-2+Zt,...

    Started by mboricgs‎, 11-19-2013 06:32 AM
    • Replies: 8
    • Views: 2,899
    11-19-2013, 11:21 AM Go to last post
  45. Time series

    Hello! Can someone help me with this: Y=X^2+Z, X,Z~N(0,1), independent equally distributed. How can I find projection od Y on span{1,X,Z}?

    Started by mboricgs‎, 11-18-2013 12:42 PM
    • Replies: 13
    • Views: 2,537
    11-19-2013, 09:43 AM Go to last post
  46. [help] cobb douglas function

    The following is an estimate of a Cobb Douglas production function. Output=34.87 +0.98 Labour +0.87Capital + 2.76 month R-sq=0.86 F=79.98 ...

    Started by numerospy‎, 11-09-2013 09:51 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,944
    11-17-2013, 11:51 PM Go to last post
  47. Finance: How to Best Summarize Rolling Returns

    Hi, I have a table of rolling returns for a number of different funds. The rolling returns are the 3-year return, calculated quarterly from Q2...

    Started by Student1990‎, 11-06-2013 09:24 PM
    • Replies: 1
    • Views: 1,409
    11-17-2013, 11:48 PM Go to last post
  48. A Question about Econometrics

    Suppose we estimate the following model:( y) ̂= .78t, where t is the time variable (t=1, 2, , T). Suppose we calculate the residuals, res, and then...

    Started by askhwhelp‎, 11-16-2013 10:49 PM
    • Replies: 1
    • Views: 1,427
    11-17-2013, 12:47 PM Go to last post
  49. suggest estimation strategy for finding unbiased estimators

    Suppose we want to estimate how household expenditures on alcohol depend on average household income and changes in average household income. We take...

    Started by askhwhelp‎, 11-17-2013 11:53 AM
    • Replies: 1
    • Views: 1,640
    11-17-2013, 12:29 PM Go to last post
  50. why regression equations are wrong and the other two are correct?

    we want to see if there is income convergence when trade liberalization takes place. we use two measures. . The fi rst is the standard deviation of...

    Started by eac13‎, 11-16-2013 06:41 PM
    • Replies: 0
    • Views: 1,180
    11-16-2013, 06:41 PM Go to last post
  51. Interarrival time distribution of uniform arrival process

    Hi guys, I am struggeling with the following for a while: I am running a simulation in which I want to model the arrival of patients. The arrival...

    Started by UserName1‎, 11-06-2013 04:04 PM
    • Replies: 1
    • Views: 5,956
    11-16-2013, 03:43 PM Go to last post
  52. Testing for Statistical Significance - Kruskal's Relative Importance

    Has anyone found a satisfactory way to test for significant differences between sub-groups (e.g., male/female) after running Kruskal's Relative...

    Started by MJKSR‎, 11-16-2013 12:13 AM
    • Replies: 0
    • Views: 2,476
    11-16-2013, 12:13 AM Go to last post
  53. Interpretation of the effect of AC and MC

    I have always read, with some special exceptions such as Y lags when you have the AR error wrong, that multicolinearity and autocorrelation does not...

    Started by noetsi‎, 11-15-2013 02:32 PM
    • Replies: 2
    • Views: 1,464
    11-15-2013, 02:52 PM Go to last post
  54. Price elasticity

    Super basic question, nonetheless, I need help. When calculating price elasticity of demand for something should you remove the data immediately...

    Started by sfsuenvs‎, 11-14-2013 02:06 PM
    elasticity
    • Replies: 3
    • Views: 1,423
    11-14-2013, 05:02 PM Go to last post
  55. Sampling Q - why can't we replace non-responders by randomly selecting new ones?

    We are planning a survey of schools to get state estimates of substance use among youth. We are doing a two-stage survey, where the first stage is a...

    Started by Modamichelle‎, 11-13-2013 05:17 PM
    bias, cluster sampling, non-response, random sampling
    • Replies: 4
    • Views: 1,858
    11-14-2013, 08:49 AM Go to last post
  56. "Unknown Factor" needed

    Good Day All I am currently handling a temperature estimation project related to drop of temperature for different type of liquid in storage...

    Started by sandeepbwes‎, 11-14-2013 01:50 AM
    • Replies: 1
    • Views: 1,234
    11-14-2013, 07:55 AM Go to last post
  57. absolute mean and std of signed error

    Hi, I'm using several infrared cameras to measure the motion of a robot travelling with a programmed velocity (ground truth). I obtained a...

    Started by novice1‎, 11-12-2013 01:51 AM
    • Replies: 3
    • Views: 2,161
    11-12-2013, 03:06 AM Go to last post
  58. [help] Dummy Variable how we check reliablity of dummy variable?

    home work questions q1. Define concept of Dummy Variable ? by giving daily real life examples. q2. Asses the following regression outputs. is...

    Started by numerospy‎, 11-09-2013 09:39 AM
    • Replies: 2
    • Views: 1,576
    11-09-2013, 06:09 PM Go to last post
  59. Help with Methodology for Political Poll

    Hi guys, I'm currently in my first year of a mathematical sciences degree at university, and have been tasked with carrying out a political poll....

    Started by NewExplorations‎, 10-23-2013 05:04 AM
    • Replies: 7
    • Views: 1,553
    11-09-2013, 03:43 PM Go to last post
  60. Interpreting coefficients of first differences of logarythms

    Hi, I am new to talkstats.com, but I hope that one day I will be a proud member of this forum. So, my problem is interpreting coefficients of...

    Started by Testeris‎, 11-07-2013 05:01 PM
    • Replies: 0
    • Views: 1,959
    11-07-2013, 05:01 PM Go to last post

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