1. 10-14-2010
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Forum: Applied Statistics

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

  1. Question Variance of mean with correlation between auto-correlated time series

    I have several time series of daily temperature measurements for the same period but different places. (More concrete, 9 places with data for 92 days...

    Started by nabla‎, 09-09-2015 05:39 AM
    • Replies: 1
    • Views: 298
    10-03-2015, 06:10 AM Go to last post
  2. statistics for number of cells per image

    greetings, I am trying to compare number of cells per image frame in a treated group and an untreated group. I created photo montages based on...

    Started by Nuland‎, 09-23-2015 04:14 PM
    • Replies: 1
    • Views: 199
    10-03-2015, 04:21 AM Go to last post
  3. missing data/multiple imputations

    They often talk about whether the mechanism that generates missing data is"ignorable." I don't really know what this means in practice. Also how do...

    Started by noetsi‎, 03-12-2015 01:40 PM
    8 Pages
    1 2 3 ... 8
    • Replies: 114
    • Views: 5,375
    09-30-2015, 01:09 PM Go to last post
  4. Data Driven Logistic Regression

    Hi everyone, I just wanted to share a real life usage of logistic regression that I like to monitor as data feeds into it. Plus he is comparing it...

    Started by LeeBalto‎, 09-22-2015 11:24 AM
    logistic regression
    • Replies: 4
    • Views: 248
    09-29-2015, 07:58 AM Go to last post
  5. MA() part of ARIMA: How do you get error terms?

    I've been through the excellent forecasting book coauthored by Hyndman on otext.org. I'm having trouble understanding the actual algorithm. The MA(x)...

    Started by jamesdvance‎, 09-21-2015 12:49 PM
    arima, forecasting
    • Replies: 7
    • Views: 447
    09-25-2015, 01:31 PM Go to last post
  6. Which control chart to use

    I am tracking spending by month going back about 5 years. It is obvious that the pattern changed dramatically in May 2015 and continued for at least...

    Started by noetsi‎, 09-24-2015 12:25 PM
    • Replies: 4
    • Views: 147
    09-24-2015, 01:34 PM Go to last post
  7. help making sense of two-tailed test

    Hello, there is no 'spatial statistic' section in this forum, but I do know that there are some 'spatial' guys around here, so I will post my...

    Started by gianmarco‎, 09-16-2015 06:49 AM
    • Replies: 2
    • Views: 321
    09-16-2015, 07:34 AM Go to last post
  8. Question Which type of time series to use?

    Hey, I have a data set which includes weekly/monthly sales and questions about customer satisfaction. I have already done EFA/CFA based on these...

    Started by purifyz‎, 08-27-2015 04:28 AM
    dfm, dynamic factor models, time series, time series analysis, time series regression
    • Replies: 6
    • Views: 511
    09-14-2015, 04:33 PM Go to last post
  9. Reoccuring patterns

    Hi, I am new to this forum and also not very firm in my statistics knowledge, so please forgive me any missing information or thinking errors. ...

    Started by wolfluk‎, 09-14-2015 06:41 AM
    • Replies: 0
    • Views: 122
    09-14-2015, 06:41 AM Go to last post
  10. Calculating a heat retention index for thermos bottles

    I have a couple of thermos bottles that I use for hot beverages at my desk. I like my drinks at about 135°-145°, so that's the range I am most...

    Started by Jennifer Murphy‎, 03-14-2015 01:09 AM
    • Replies: 5
    • Views: 641
    09-13-2015, 10:09 PM Go to last post
  11. conditional distribution functions.


    Started by wmjs2‎, 09-13-2015 12:58 AM
    conditional distribution, poisson
    • Replies: 0
    • Views: 537
    09-13-2015, 12:58 AM Go to last post
  12. Multivariate normality and sample size

    I see these type of comments a lot and I don't understand why they are correct (I know this has to do with tests that are asymptotically accurate).

    Started by noetsi‎, 08-21-2015 03:30 PM
    • Replies: 7
    • Views: 344
    09-11-2015, 07:43 PM Go to last post
  13. Determining outliers

    Dear folks, I am interested in statistics but I never had a course in college and I've had to learn a few basic things myself. This time, I am...

    Started by Moemanofnj‎, 09-10-2015 09:34 AM
    • Replies: 7
    • Views: 328
    09-10-2015, 12:37 PM Go to last post
  14. Standardizing the SD of two price series with different mean

    Hello, I have got two time series of stock prices. Usually the logarithmic returns (= first difference of logarithmic prices) are used to...

    Started by consuli‎, 08-28-2015 05:43 AM
    • Replies: 3
    • Views: 464
    09-05-2015, 12:53 PM Go to last post
  15. Egarch

    the real life interpretation of constant (omega) parameters in EGARCH model.

    Started by nonso‎, 09-04-2015 07:05 AM
    • Replies: 0
    • Views: 183
    09-04-2015, 07:05 AM Go to last post
  16. Calculating Population-weighted Atkinson index in Excel

    For my dissertation, I am calculating inequality on a worldwide level, between countries. In my calculations, I would like to give each country a...

    Started by eosdk‎, 08-30-2015 03:46 AM
    atkinson, excel, formula, inequality
    • Replies: 2
    • Views: 335
    08-30-2015, 05:07 PM Go to last post
  17. Combining queues

    So i am playing around with a serial queueing model. At the moment i have two independent M/M/1 queues, but with different parameters for the...

    Started by Prometheus‎, 08-27-2015 04:03 AM
    • Replies: 0
    • Views: 123
    08-27-2015, 04:03 AM Go to last post
  18. Cluster techniques for large datasets

    Hi all. I am looking for a topic of my master's dissertation. I had an initial discussion with my supervisor and we decided to analyze different...

    Started by Spyros13‎, 08-26-2015 12:28 PM
    • Replies: 6
    • Views: 275
    08-26-2015, 01:04 PM Go to last post
  19. How to divide standard deviation

    Hi, I am developing a model of vehicles traveling regular routes. Assume the length of the path (distance) from each stop to the next is known....

    Started by mattbrenner‎, 08-23-2015 10:56 AM
    standard deviation
    • Replies: 0
    • Views: 196
    08-23-2015, 10:56 AM Go to last post
  20. Determine sample size to get a statistically significant result

    Hello, this question concerns the topic of A/B split-testing. More about it on wiki here. I need to determine what is sample size would I require...

    Started by egordryagin‎, 08-19-2015 08:25 AM
    power calculation, probability, sample size, statistical significance
    • Replies: 1
    • Views: 283
    08-19-2015, 09:03 AM Go to last post
  21. Brownian motion around a sinusoid.

    I wish to model arrivals of people into a healthcare queue. The methods I have studied involve assuming that the arrival rate is constant - but the...

    Started by Prometheus‎, 07-25-2015 11:28 AM
    • Replies: 8
    • Views: 408
    08-18-2015, 02:05 PM Go to last post
  22. [SOLVED] NPV calculation

    I am not doing NPV in the normal sense. I have an existing cost. We generate a benefit that begins when the person leaves the system. We assume,...

    Started by noetsi‎, 08-18-2015 12:36 PM
    • Replies: 0
    • Views: 144
    08-18-2015, 12:36 PM Go to last post
  23. Nonparametic equivalent for RM 2way?

    Hi! I'm new here and at my company we do not have an easily accessible statistician so any help that you can provide would be greatly appreciated. ...

    Started by ligeia78‎, 08-17-2015 10:58 AM
    nonparametric rm?
    • Replies: 1
    • Views: 204
    08-18-2015, 02:09 AM Go to last post
  24. Question Aggregation of different variables

    Hi there ! I'm currently doing a regression and some of my explanatory variables are socio economic ones (revenue, number of children per...

    Started by RenaudM‎, 08-14-2015 06:32 AM
    • Replies: 1
    • Views: 177
    08-17-2015, 07:33 AM Go to last post
  25. Does this use of graphs create wrong answers.

    I am graphing 5 flows of spending over time (in excel, but I don't think that is pertinent to this issue). Because the axis ranges from 0 to 11...

    Started by noetsi‎, 08-08-2015 01:36 PM
    • Replies: 8
    • Views: 360
    08-13-2015, 11:06 AM Go to last post
  26. Serial Queuing Model

    Hi all, Does anyone know of any good resources for how to develop a queuing model which has serial servers? It would be a bonus if it uses R. ...

    Started by Prometheus‎, 08-10-2015 08:42 AM
    • Replies: 3
    • Views: 200
    08-13-2015, 03:27 AM Go to last post
  27. Applying Statistics to Random Drug Screening

    Hi everyone. I'm new to the forum and I joined because I was hoping someone could assist me with a problem that I'm trying to solve at work. I've got...

    Started by jonarnold85‎, 08-11-2015 05:21 PM
    • Replies: 5
    • Views: 280
    08-12-2015, 08:51 PM Go to last post
  28. Application of Empirical Bayes Method in Supply Risk

    Hello everyone, I am interested in creating a tool in Excel which would find estimates of the rate of occurrences of non conforming items received...

    Started by Paris‎, 08-12-2015 03:54 PM
    empirical bayes, empirical bayes method, estimators, parameter estimation, poisson-gamma model
    • Replies: 0
    • Views: 151
    08-12-2015, 03:54 PM Go to last post
  29. Specifying interaction terms

    I rarely if ever have any substantive theory to base my models on. That said, say you have five variables you think might impact some DV. Not knowing...

    Started by noetsi‎, 08-11-2015 08:27 AM
    • Replies: 8
    • Views: 275
    08-11-2015, 03:54 PM Go to last post
  30. Is there somewhere online to ask really simple stats questions?

    I mean somewhere where people are patient enough to answer stupid questions? All the statisticians are away at work & I've resorted to googling...

    Started by Julii‎, 08-09-2015 01:42 PM
    • Replies: 5
    • Views: 345
    08-11-2015, 04:43 AM Go to last post
  31. Betting Statistics - Calculation of odds accuracy - what am I measuring here?

    Hello folks! Before anything, an important disclaimer: I am an amateur at statistics and I’m trying to learn by my own. Please bear with me if the...

    Started by sharpbounce‎, 08-10-2015 11:44 AM
    brier score, odds, prediction
    • Replies: 2
    • Views: 234
    08-10-2015, 02:17 PM Go to last post
  32. multi variant analysis for the weighted effects on migration

    Hello, I have two questions: that are connected but not exactly the same. now, I'm not a statistician but more of a historian, so be gentle :) I...

    Started by Amir Schwarz‎, 08-10-2015 12:12 PM
    • Replies: 0
    • Views: 131
    08-10-2015, 12:12 PM Go to last post
  33. Operations Research - Does the independent variable affect sales dollars?

    I have five branches in my company. Each branch has a showroom. Each showroom does not have the same mix of items. Some items are in all showrooms,...

    Started by tpjph92‎, 08-10-2015 08:13 AM
    • Replies: 5
    • Views: 161
    08-10-2015, 10:24 AM Go to last post
  34. Help Required - Using Correlation Factor to Estimate Missing Data

    Dear Gents/Ladies, I need help please, I have to sets of data, which are actually readings of temperatures in two different spots versus time,...

    Started by Kariem‎, 08-05-2015 01:21 PM
    • Replies: 3
    • Views: 269
    08-05-2015, 02:40 PM Go to last post
  35. Centering interaction terms.

    Ender in his 2010 book "Applied Missing Data Analysis" says: "When an analysis model includes an interaction effect between two or more...

    Started by noetsi‎, 07-27-2015 08:26 AM
    • Replies: 12
    • Views: 676
    08-03-2015, 10:15 AM Go to last post
  36. What is the best software for SEM

    In my program it was felt to be Mplus and then EQS. But I am relearning SEM and would like to know which is the best software to relearn with it.

    Started by noetsi‎, 06-18-2015 04:13 PM
    • Replies: 9
    • Views: 615
    07-28-2015, 02:33 PM Go to last post
  37. Post [Discrete test sample size] Number of samples to test after failures occur

    Hello, I work as an engineer at a large manufacturer and we typically use high stress tests on new products to discover failure modes. Sometimes...

    Started by bba‎, 07-27-2015 11:25 AM
    contingency, engineering, failures, sample size
    • Replies: 0
    • Views: 212
    07-27-2015, 11:25 AM Go to last post
  38. spline regression in budgetary data analysis

    I am in the process of analyzing a large data set of financial data. In is roughly the budgets of ~1000 entities over a 15 year time frame. Some...

    Started by the42up‎, 07-26-2015 09:10 AM
    • Replies: 0
    • Views: 206
    07-26-2015, 09:10 AM Go to last post
  39. standard error on a standardized proficiency test -- applicable specific groups?

    In need of some expert advice. Students at my university take a standardized English proficiency test (the TOEIC). There are two sections, Reading...

    Started by Nattie‎, 07-22-2015 07:03 PM
    • Replies: 0
    • Views: 206
    07-22-2015, 07:03 PM Go to last post
  40. SPC Chart - Value outside 3s: outlier on the trend or new trend?

    Hi all. I've just started using SPC at my job to study performance and it's being straightforward, but now I have a question. If I have a trend...

    Started by Dan TheMan‎, 07-13-2015 07:30 AM
    • Replies: 5
    • Views: 352
    07-21-2015, 07:08 AM Go to last post
  41. Reducing # of Charts and Control Limits

    Hi All, Im starting to use spc on my job and our manager told me to reduced number of charts and control limits, I have the following: ...

    Started by sandra3173‎, 07-21-2015 01:56 AM
    • Replies: 0
    • Views: 172
    07-21-2015, 01:56 AM Go to last post
  42. Defining model - are my samples too small?

    Hello, I am attempting a valuation of a non-market good. This non-market good is made up of a number of component parts. I have conducted a...

    Started by samuelle‎, 07-17-2015 04:49 AM
    model, non-market, valuation
    • Replies: 0
    • Views: 197
    07-17-2015, 04:49 AM Go to last post
  43. Principal component analysis, observable variable, VAR, SUR, SEM

    Hello, I would like to ask you for your advice on my methodology issue. I want to predict GDP and Inflation using VAR model. As an additional...

    Started by jrf‎, 07-14-2015 06:55 AM
    • Replies: 0
    • Views: 397
    07-14-2015, 06:55 AM Go to last post
  44. CI based on QQ Plot

    Should I have any reservations slapping 95% CI on the variable this came from. The variable is a difference of two other variables.

    Started by hlsmith‎, 07-09-2015 09:19 AM
    • Replies: 4
    • Views: 365
    07-09-2015, 10:00 AM Go to last post
  45. Lightbulb New Tax Concept

    Hello, I've been recently mulling over the systematic issues that seem to plague our current society. Primarily, income inequality. I'm a firm...

    Started by Kulterkampf‎, 07-07-2015 05:48 PM
    distribution, ideas, reform, tax
    • Replies: 3
    • Views: 438
    07-09-2015, 09:51 AM Go to last post
  46. Question Hypothesis testing with predefined constant means

    Hi, How can I calculate the p-value (statistical significance) if my hypothesis asks for specific mean values? (Cross-Post with no answer yet:...

    Started by SailAvid‎, 07-06-2015 02:16 AM
    anova, hypothesis testing
    • Replies: 2
    • Views: 308
    07-09-2015, 02:34 AM Go to last post
  47. Error band for calibration correction of an instrument

    I apologize if this is the wrong area to post this. It seems like it could fall into a couple different areas. I have a question about calculating...

    Started by gryffin13‎, 06-30-2015 12:01 AM
    calibration, error, instrument, interval, prediction
    • Replies: 2
    • Views: 248
    07-07-2015, 11:31 AM Go to last post
  48. Comparison of two particulate mass measurement techniques

    Hi all, I posted this elsewhere on the site, though I'm concerned that my initial post wasn't in the appropriate forum, so I'll give a shot here. ...

    Started by reactant‎, 06-29-2015 04:33 PM
    • Replies: 1
    • Views: 184
    07-07-2015, 10:12 AM Go to last post
  49. Time series

    I return to my annual effort to learn time series :p There are regression models designed to deal with autocorrelation in time series data....

    Started by noetsi‎, 06-30-2015 01:22 PM
    • Replies: 6
    • Views: 374
    07-06-2015, 02:45 PM Go to last post
  50. Comparing two Likert scales

    Hi! I'm working on my thesis and I have to compare how two constructs relate to each other. I have two Likert scales, one for each...

    Started by natalie_‎, 07-04-2015 11:10 AM
    • Replies: 0
    • Views: 273
    07-04-2015, 11:10 AM Go to last post
  51. Sample size determination for estimating a distribution

    I am building an installation that measures the Current in a system resulting from two moving objects passing eachother. I want to conduct an...

    Started by maq‎, 07-02-2015 05:15 AM
    • Replies: 3
    • Views: 389
    07-04-2015, 08:15 AM Go to last post
  52. Method of Variable selection for VAR model

    Hi, I need to build a weighted index, given some variables using the VAR (vector auto regression) approach. The weights of the variable are to be...

    Started by vikas.trades25‎, 07-03-2015 09:27 AM
    • Replies: 0
    • Views: 169
    07-03-2015, 09:27 AM Go to last post
  53. Multilevel modeling - dependent variable is not normally distributed

    Hello everybody, I am doing the research, using Multilevel linear modeling (MLM), with dependent variable number of days of payment delays, which...

    Started by ladybird‎, 06-28-2015 01:53 PM
    distributions, mixed model, multilevel modeling, time series
    • Replies: 9
    • Views: 503
    06-30-2015, 03:28 PM Go to last post
  54. Factors A and B creating factor C, how to analyze for response R?

    Let's say I have a process in which I can change factors A and B. Testing the widgets that are made by the process results in test data C for each...

    Started by babucher‎, 06-24-2015 08:05 PM
    • Replies: 3
    • Views: 263
    06-29-2015, 09:25 PM Go to last post
  55. How to WEIGHT the adjusted Fisher–Pearson standardized moment coefficient (skewness).

    Hello, I'm using the adjusted Fisher–Pearson standardized moment coefficient formula to calculate the skew of some sample data (it's the same...

    Started by Multiplex‎, 06-20-2015 01:22 PM
    fisher–pearson, skewness, weight
    • Replies: 2
    • Views: 747
    06-29-2015, 03:11 PM Go to last post
  56. An average of standard deviations?

    Hello, My apologies if this isn't the correct forum for this, but I'm trying to analyze some data and can't figure out how to obtain an accurate...

    Started by indoze‎, 11-05-2010 08:53 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 119,238
    06-29-2015, 11:58 AM Go to last post
  57. Variance ratio and Hurst exponent tests

    Hi, I have used the Chow Denning test and the Hurst exponent (Peng, Whittle and R/S methods) to examine if a particular time series follows a random...

    Started by Yudhvir‎, 06-28-2015 03:23 AM
    heteroscedasticity, time series analysis
    • Replies: 0
    • Views: 165
    06-28-2015, 03:23 AM Go to last post
  58. significant change in binomial data?

    I want to determine how much of a change in pass rates do I need to observe for it to be statistically significant. For example: pretend there are...

    Started by thankyou‎, 06-26-2015 09:14 PM
    binomial data, educational measurement, statistical difference
    • Replies: 1
    • Views: 242
    06-27-2015, 02:28 AM Go to last post
  59. Test Statistic for Comparing Two Groups of Discrete Data on a Per Unit Basis

    I work in a small MEMS fab. I have a spin coating process where polymer is dispensed, spun and cured on individual wafers. Following the cure I use a...

    Started by ZeroHaste‎, 06-25-2015 06:16 PM
    attribute data, defect data, discrete data, poission
    • Replies: 0
    • Views: 201
    06-25-2015, 06:16 PM Go to last post
  60. Red face Recalculation of Control Limits & Cpk target when using 3 Sigma

    Hi All I Just want to ask some help regarding Recalculation of Control limits & target cpk when our company is using 3 sigma. I am working in a...

    Started by sandra3173‎, 06-24-2015 09:43 PM
    • Replies: 4
    • Views: 268
    06-25-2015, 09:36 AM Go to last post

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