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Threads 541 to 600 of 1509

Forum: Applied Statistics

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

  1. Linearity

    A key issue for me is to determine if my data is non-linear and determine ways to make it linear if possible. An approach that looks promising to me...

    Started by noetsi‎, 09-23-2014 10:57 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 11,511
    10-05-2014, 09:24 PM Go to last post
  2. Poisson distribution and muon decays

    Hello, I have gathered muon decay data and used R's non linear least squares function to find the mean muon lifetime. I did this by taking the...

    Started by cohara‎, 10-05-2014 12:13 PM
    matlab, muon, poisson, statistical computing
    • Replies: 1
    • Views: 2,796
    10-05-2014, 04:03 PM Go to last post
  3. Statistics of fault indicator and maintenance for repairable fleet

    There is a fleet of repairable units and the units have system health measurements which consist primarily of vibration amplitudes. The health...

    Started by JVorwald‎, 10-03-2014 06:12 AM
    accuracy, maintenance, reliability, repair
    • Replies: 0
    • Views: 2,010
    10-03-2014, 06:12 AM Go to last post
  4. Comparing estimates from a mixed-effect model and submodels

    Hi, I have a estimated coefficients for mixed-effect logistic regression model with three factors (A, B, C) and three interactions. The estimates ...

    Started by Scarlatti‎, 10-01-2014 08:41 PM
    • Replies: 0
    • Views: 1,127
    10-01-2014, 08:41 PM Go to last post
  5. beta distribution

    Alpha and beta are two parameters that jointly determine the shape of a beta distribution. So far I have not found a good discussion of what these...

    Started by noetsi‎, 10-01-2014 12:49 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,580
    10-01-2014, 04:41 PM Go to last post
  6. Exponential Smoothing Books

    I have spent a really long time looking for good books on this topic. I found one using SAS (Milhoj), but it only covered a small portion of what I...

    Started by noetsi‎, 09-29-2014 09:17 AM
    • Replies: 0
    • Views: 1,119
    09-29-2014, 09:17 AM Go to last post
  7. longitudinal multivariate data - multivariate repeated measures

    Hi! Am dealing with a multivariate longitudinal data where we collect data from two group of subjects (cases and controls) at baseline , one month...

    Started by risu‎, 09-26-2014 01:46 AM
    collinearity, longitudinal, multivariate data, repeated measures
    • Replies: 1
    • Views: 1,179
    09-28-2014, 11:34 AM Go to last post
  8. Two-stage fixed-effects panel model - how should I interpret the coefficients?

    Hello all: I ran a 2-stage fixed-effects panel model in R. The goal is to find the effect of strategic alliance participation on firm performance....

    Started by jayhawk‎, 09-28-2014 11:23 AM
    interpreting results, panel fixed effects, two stage
    • Replies: 0
    • Views: 2,996
    09-28-2014, 11:23 AM Go to last post
  9. QQ plots

    I have worked on these exclusively in the past in the context of normal distribution. A software generates a diagonal line which represents a normal...

    Started by noetsi‎, 09-25-2014 04:51 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 5,800
    09-26-2014, 03:41 PM Go to last post
  10. Bonferoni when running multiple models

    Like lots of other people I suspect :p I commonly run many models with the same data. For example I might run five variables, than transform one and...

    Started by noetsi‎, 09-25-2014 10:10 AM
    • Replies: 2
    • Views: 1,224
    09-25-2014, 09:08 PM Go to last post
  11. Testing when one year's sales volumes vary significantly from this time last year

    Hi all, I have a puzzle regarding sales volumes and how to know whether, 6-months into the year, for example, my current volume is on track for...

    Started by mdc35‎, 09-25-2014 10:28 AM
    sales, statistical tests, time series analysis
    • Replies: 0
    • Views: 1,142
    09-25-2014, 10:28 AM Go to last post
  12. Assumption Wilcoxon signed rank test

    This is analogous to a one sample t test. I have found what seems like disagreement about the assumptions of this method. Some say that it only...

    Started by noetsi‎, 09-24-2014 02:31 PM
    • Replies: 6
    • Views: 1,791
    09-25-2014, 10:07 AM Go to last post
  13. Variance decomposition

    I am trying to compute a variance decomposition, based on a variance components model. Specifically, price variability explained by variability...

    Started by jsaldain‎, 09-23-2014 03:23 PM
    • Replies: 0
    • Views: 926
    09-23-2014, 03:23 PM Go to last post
  14. New Member Assistance: RPI Calculation for Sports Application

    I am a volunteer with the Ontario minor hockey system and we are investigating ranking systems for our youth teams. Is anyone aware where I could...

    Started by holmesy‎, 09-22-2014 11:11 AM
    • Replies: 0
    • Views: 1,177
    09-22-2014, 11:11 AM Go to last post
  15. do we need to test for stationarity if not using autocorrelation?

    hi everyone, just a quick question. i know for time series, we need to test for stationarity before we can run ARIMA type models. what if i am just...

    Started by jimjohn‎, 09-07-2014 07:03 PM
    • Replies: 6
    • Views: 1,961
    09-22-2014, 10:25 AM Go to last post
  16. autocorrelation tests

    Hi everybody, I have a question about residual autocorrelation tests on eviews 8 student version. I estimated a var model, and I'd like to test...

    Started by matteo.bianchi11‎, 09-21-2014 09:58 AM
    • Replies: 0
    • Views: 3,524
    09-21-2014, 09:58 AM Go to last post
  17. would like ffedback on right Machine Learning Method to apply

    Hi I am new to big data and I am trying to decide on a learning project to do. I have a imaginary "new" widget design out in the field being...

    Started by jscriptor09‎, 09-17-2014 09:54 PM
    • Replies: 0
    • Views: 1,024
    09-17-2014, 09:54 PM Go to last post
  18. Customer segmentation effectiveness

    Hi, I have a question. I have a dataset of a few customer segments, their customers, the products they bought and the margin at the moment of...

    Started by stats_starter‎, 09-17-2014 04:44 PM
    • Replies: 0
    • Views: 763
    09-17-2014, 04:44 PM Go to last post
  19. A/B/C Conversion Optimisation

    Hi All, I'm trying to understand the process behind testing both A/B site changes for statistically significant increases in conversion rate, and...

    Started by samg86‎, 09-17-2014 02:29 AM
    a/b testing, binomial, optimisation, z-test
    • Replies: 0
    • Views: 1,049
    09-17-2014, 02:29 AM Go to last post
  20. experiment results between workers in a laboratory - which test

    Hi all, (this is my first post) I need to compare the performances of technicians in the lab for a specific experiment. There is no defined or...

    Started by glacierst‎, 09-12-2014 04:15 AM
    • Replies: 4
    • Views: 1,785
    09-16-2014, 01:00 PM Go to last post
  21. Statistical procedure problem

    Hello. I recently entered the world of corporate data mining, and I'm a bit stumped with a request from my boss. I'm pretty well versed on a variety...

    Started by J.J.‎, 09-13-2014 03:45 PM
    • Replies: 0
    • Views: 932
    09-13-2014, 03:45 PM Go to last post
  22. Question Urgent Help needed regarding r1 Autocorrelation

    I'm searching from past 2 hours on the internet and I'm unable to find a solved example of calculating r1 first coefficient of correlation from the...

    Started by Dawood‎, 09-10-2014 03:48 PM
    autocorrelation, econometrics
    • Replies: 1
    • Views: 1,895
    09-10-2014, 08:10 PM Go to last post
  23. How to compare pre-post outcome when each subject react differently?

    I have 11 subjects with pre and post outcome (two repeated measures). I'd like to test the difference between both conditions. The problem is...

    Started by Themistocle‎, 09-07-2014 12:12 PM
    paired comparisons
    • Replies: 6
    • Views: 1,892
    09-10-2014, 03:09 PM Go to last post
  24. Weekly Event Probability in a time Range

    Hi All, I am a humble student Engineer/Software Developer that has not touched anything other than BAsic statistics. I have been given the task of...

    Started by JayCain‎, 09-05-2014 02:18 AM
    • Replies: 0
    • Views: 1,179
    09-05-2014, 02:18 AM Go to last post
  25. 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
  26. chow test in foreign direct investment analysis

    Hi fellows! I'm beginner in statistics so please forgive me in asking stupid questions :) What I'm trying to do is Chow test for Foreign Direct...

    Started by mysje_hood‎, 09-02-2014 03:36 PM
    • Replies: 0
    • Views: 1,412
    09-02-2014, 03:36 PM Go to last post
  27. Question Which test? - Significance of Sample Size

    Hi all, (First-time poster) I'm working with tagging data for 35 tracked fish. Each fish was tracked of 3 seasons, with detections (3873 overall)...

    Started by MMMCPC‎, 08-29-2014 04:08 PM
    biology, relevance, sample size, significance, test
    • Replies: 5
    • Views: 1,835
    09-02-2014, 11:21 AM Go to last post
  28. Compare a trial and control

    I want to be able to work out if the results of trials are significant. Assume I have the data for a control and a Trial. The number of samples in...

    Started by Mikezzz‎, 08-13-2014 06:09 AM
    • Replies: 1
    • Views: 1,286
    09-01-2014, 07:47 AM Go to last post
  29. cox proportional hazard question

    Usually if you have a categorical variable with more than two levels one level is not coded as a dummy (this is the reference level). In regression...

    Started by noetsi‎, 08-28-2014 10:55 AM
    • Replies: 6
    • Views: 1,611
    08-30-2014, 02:40 AM Go to last post
  30. Pasimonious Model for Neural Networks forecasting, I am really confusing.

    Hello People I recently studied Neural Networks forecasting and some interesting question arose while I am reading various articles on the net. ...

    Started by auto9817‎, 08-27-2014 06:53 AM
    • Replies: 0
    • Views: 1,318
    08-27-2014, 06:53 AM Go to last post
  31. B2B Sales revenue data and Time Series analysis

    Hello, I am a new member. I have a data set at work that includes quarterly revenue data over 3 consecutive years. Depending upon the product...

    Started by RWORR1‎, 08-25-2014 12:31 PM
    • Replies: 1
    • Views: 1,275
    08-26-2014, 04:54 AM Go to last post
  32. Sample Size For Marketing

    Lets say I put an ad up on a website and pay some amount every time someone views it. In order to make a profit I need 1/x (x varies so it can be...

    Started by xero007‎, 08-26-2014 12:01 AM
    • Replies: 0
    • Views: 1,091
    08-26-2014, 12:01 AM Go to last post
  33. Network Probability on a givien server

    There are 100 Clients. A Client will download a file for 30 seconds every 7 minutes (1/14th of the time they are downloading... conversely 13/14th of...

    Started by techsmarty‎, 08-25-2014 06:19 PM
    • Replies: 0
    • Views: 749
    08-25-2014, 06:19 PM Go to last post
  34. Passing from daily pds probability to annual probability

    Hello, I'm stuck on the next conversion or adjustment. I have the following problem, I'm using Weibull observational probability (order/(N+1) on my...

    Started by Jpalbae‎, 08-24-2014 04:56 PM
    annual period, daily, partial_duration_series
    • Replies: 0
    • Views: 2,108
    08-24-2014, 04:56 PM Go to last post
  35. Which analysis? Measured versus modeled

    Hello, I'm having trouble deciding which type of statistical analysis I should use to compare my modeled data to my measured data and was...

    Started by ddalluge‎, 08-20-2014 10:20 PM
    • Replies: 1
    • Views: 1,941
    08-23-2014, 04:32 AM Go to last post
  36. Cointegration in Non-linear time series

    I have the following problem: In*non-linear time series regression yt = g(xt)+et, if xt is non-stationary (i.e. I(1)) and yt is stationary (i.e....

    Started by nasazonova‎, 08-20-2014 03:45 PM
    non-linear, time series
    • Replies: 0
    • Views: 1,075
    08-20-2014, 03:45 PM Go to last post
  37. Treating multiple observations per object

    My data consists of thousands of machine elements, their price, as well as technical and non-technical attributes. Most of the data is categorical ...

    Started by John Dow‎, 08-20-2014 12:25 PM
    correlation, data mining, rattle, regression
    • Replies: 0
    • Views: 831
    08-20-2014, 12:25 PM Go to last post
  38. 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: 27
    • Views: 5,080
    08-19-2014, 09:14 AM Go to last post
  39. Overall Effect of CRM/Marketing programme

    I currently have ...

    Started by MB30‎, 08-18-2014 01:33 PM
    • Replies: 0
    • Views: 2,469
    08-18-2014, 01:33 PM Go to last post
  40. Problem with Firth Logistic Regression

    Hello all, I am having some issues trouble shooting a Firth Logistic regression model I have run on municipal level data. So, I have a dataset on...

    Started by stdald15‎, 08-11-2014 10:20 PM
    • Replies: 0
    • Views: 2,586
    08-11-2014, 10:20 PM Go to last post
  41. Sports Ratings: Is it Possible to Rate Teams from Different Years?

    Hello, I am new to the forum, but I have taken statistics in college. I would like to apply an algorithm, so I can compare high school football...

    Started by hoosier122‎, 08-08-2014 06:04 PM
    • Replies: 0
    • Views: 1,381
    08-08-2014, 06:04 PM Go to last post
  42. Measuring Changes in Variable Relationship Over Time

    Hi, I am trying to monitor the relationship between two variables over time and detect when a signifcant change in the relationship between them...

    Started by tuathal‎, 08-08-2014 07:51 AM
    • Replies: 0
    • Views: 1,356
    08-08-2014, 07:51 AM Go to last post
  43. STATA - Survival Analysis

    Hello everyone, I am working on a dataset (IPOs) and trying to code those that fail and those that survive. Basically I am coding IPOs that...

    Started by lucas111‎, 08-08-2014 02:25 AM
    • Replies: 0
    • Views: 1,123
    08-08-2014, 02:25 AM Go to last post
  44. 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: 2,271
    08-06-2014, 02:07 AM Go to last post
  45. Bootstrapping residuals

    Hi! I am writing my master thesis in mutual funds in norway. in this I have to bootstrap some residuals according to the method of Kosowski et al...

    Started by neztirual‎, 08-05-2014 07:40 AM
    • Replies: 0
    • Views: 2,414
    08-05-2014, 07:40 AM Go to last post
  46. selecting reporting stat for Johansen Test for Cointegration

    All, I am running a Johansen test to test for co-integration and do not find an statistically significant result in either the max eigenvalue...

    Started by vikingo‎, 08-04-2014 08:58 AM
    cointegration, hqic, johansen test
    • Replies: 1
    • Views: 1,824
    08-04-2014, 11:00 AM Go to last post
  47. 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: 6
    • Views: 6,791
    08-04-2014, 12:25 AM Go to last post
  48. Box Cox Transformation on time series

    Hi, I want to apply box cox transformation on my time series. I was just wondering can I apply the transformation on any time series or do i have...

    Started by s_chrodinger‎, 08-01-2014 11:50 AM
    box-cox, non-stationary, time series, transformation
    • Replies: 0
    • Views: 1,345
    08-01-2014, 11:50 AM Go to last post
  49. 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_‎, 07-31-2014 04:39 AM
    • Replies: 3
    • Views: 1,769
    07-31-2014, 10:30 AM Go to last post
  50. 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: 1,594
    07-29-2014, 12:56 AM Go to last post
  51. 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: 1,329
    07-28-2014, 09:21 AM Go to last post
  52. 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: 2,408
    07-28-2014, 03:06 AM Go to last post
  53. 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: 1,788
    07-26-2014, 09:09 AM Go to last post
  54. 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: 2,727
    07-25-2014, 01:32 AM Go to last post
  55. 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: 1,342
    07-24-2014, 06:59 PM Go to last post
  56. 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: 1,272
    07-23-2014, 05:04 PM Go to last post
  57. 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: 1,111
    07-22-2014, 10:31 AM Go to last post
  58. 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: 4,111
    07-21-2014, 02:29 PM Go to last post
  59. 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: 9,599
    07-21-2014, 12:33 PM Go to last post
  60. 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: 2,621
    07-17-2014, 08:21 PM Go to last post

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