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Forum: Applied Statistics

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

  1. 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, Today 04:28 AM
    time series, time series analysis, time series regression
    • Replies: 0
    • Views: 60
    Today, 04:28 AM Go to last post
  2. 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, Today 04:03 AM
    • Replies: 0
    • Views: 25
    Today, 04:03 AM Go to last post
  3. 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, Yesterday 12:28 PM
    • Replies: 6
    • Views: 104
    Yesterday, 01:04 PM Go to last post
  4. 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: 112
    • Views: 4,425
    08-25-2015, 02:18 PM Go to last post
  5. 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: 89
    08-23-2015, 10:56 AM Go to last post
  6. 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: 5
    • Views: 140
    08-21-2015, 05:05 PM Go to last post
  7. 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: 164
    08-19-2015, 09:03 AM Go to last post
  8. 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: 318
    08-18-2015, 02:05 PM Go to last post
  9. [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: 83
    08-18-2015, 12:36 PM Go to last post
  10. 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: 138
    08-18-2015, 02:09 AM Go to last post
  11. 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: 123
    08-17-2015, 07:33 AM Go to last post
  12. 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: 268
    08-13-2015, 11:06 AM Go to last post
  13. 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: 128
    08-13-2015, 03:27 AM Go to last post
  14. 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: 212
    08-12-2015, 08:51 PM Go to last post
  15. 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: 100
    08-12-2015, 03:54 PM Go to last post
  16. 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: 175
    08-11-2015, 03:54 PM Go to last post
  17. 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: 271
    08-11-2015, 04:43 AM Go to last post
  18. 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: 158
    08-10-2015, 02:17 PM Go to last post
  19. 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: 81
    08-10-2015, 12:12 PM Go to last post
  20. 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: 101
    08-10-2015, 10:24 AM Go to last post
  21. 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: 211
    08-05-2015, 02:40 PM Go to last post
  22. 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: 574
    08-03-2015, 10:15 AM Go to last post
  23. 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: 512
    07-28-2015, 02:33 PM Go to last post
  24. 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: 176
    07-27-2015, 11:25 AM Go to last post
  25. 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: 157
    07-26-2015, 09:10 AM Go to last post
  26. 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: 148
    07-22-2015, 07:03 PM Go to last post
  27. 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: 295
    07-21-2015, 07:08 AM Go to last post
  28. 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: 127
    07-21-2015, 01:56 AM Go to last post
  29. 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: 156
    07-17-2015, 04:49 AM Go to last post
  30. 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: 310
    07-14-2015, 06:55 AM Go to last post
  31. 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: 295
    07-09-2015, 10:00 AM Go to last post
  32. 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: 363
    07-09-2015, 09:51 AM Go to last post
  33. 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: 250
    07-09-2015, 02:34 AM Go to last post
  34. 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: 199
    07-07-2015, 11:31 AM Go to last post
  35. 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: 150
    07-07-2015, 10:12 AM Go to last post
  36. 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: 319
    07-06-2015, 02:45 PM Go to last post
  37. 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: 215
    07-04-2015, 11:10 AM Go to last post
  38. 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: 317
    07-04-2015, 08:15 AM Go to last post
  39. 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: 124
    07-03-2015, 09:27 AM Go to last post
  40. 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: 434
    06-30-2015, 03:28 PM Go to last post
  41. 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: 223
    06-29-2015, 09:25 PM Go to last post
  42. 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: 599
    06-29-2015, 03:11 PM Go to last post
  43. 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: 114,197
    06-29-2015, 11:58 AM Go to last post
  44. 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: 136
    06-28-2015, 03:23 AM Go to last post
  45. 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: 214
    06-27-2015, 02:28 AM Go to last post
  46. 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: 171
    06-25-2015, 06:16 PM Go to last post
  47. 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: 204
    06-25-2015, 09:36 AM Go to last post
  48. Time Series with Multiple Intervention Dates

    I'm working with a time series in which the same intervention was applied to a large number of items but at different points. Essentially, I have...

    Started by elanmorin‎, 06-25-2015 08:57 AM
    arima, causalimpact, intervention, time series
    • Replies: 0
    • Views: 130
    06-25-2015, 08:57 AM Go to last post
  49. item parceling in SEM?

    what advantage can one get from item parceling in SEM? it is really controversial in the publications. How do I know if I need it and how do I...

    Started by fengyuwuzu‎, 06-22-2015 03:02 PM
    • Replies: 0
    • Views: 188
    06-22-2015, 03:02 PM Go to last post
  50. [GARCH model] Why do we need a "mean equation" ?

    Hi, :) As i said in my first topic, I'm a beginner in financial statistics. I read a lot of things about GARCH, but I didn't find a precise...

    Started by Latiole‎, 08-12-2012 10:00 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,051
    06-14-2015, 02:55 PM Go to last post
  51. Descriptive statistics on dummy variables in financial time series

    I got daily returns for the last 15 years. I would like to find the the descriptive statistics(mean,Stdev,skewness, kurtosis) impact on last Thursday...

    Started by EdwinRaj‎, 06-11-2015 04:45 AM
    descriptive statistics, time series analysis
    • Replies: 3
    • Views: 213
    06-11-2015, 11:16 AM Go to last post
  52. Data set where the result for an observation depends on another observation

    Hello, and thanks in advance for your help, I am an economics major and trying to learn some stats on my own. I am forming a data set for sports...

    Started by WC4J‎, 06-09-2015 06:17 AM
    • Replies: 3
    • Views: 306
    06-10-2015, 03:52 AM Go to last post
  53. How to calculate Standard Error for unequal sample sizes

    Gurus, can you help please? I've been given a set of samples, each has different sample size and mean (but not individual observations). I'm...

    Started by RichS‎, 06-09-2015 09:06 AM
    • Replies: 1
    • Views: 194
    06-09-2015, 09:59 AM Go to last post
  54. Arriving at sample size the correct way.

    Dear members, I have a large group of our customers who have transacted with us once. I would like pick up a sample group of customers from...

    Started by Nikhil0904‎, 06-06-2015 05:02 AM
    sample size
    • Replies: 3
    • Views: 366
    06-08-2015, 02:20 AM Go to last post
  55. Variance - fleeting thought

    As I broaden my stats knowledge I better learn components of different approaches but also see similarities. I notice tonight that in multilevel...

    Started by hlsmith‎, 06-06-2015 10:35 PM
    • Replies: 0
    • Views: 219
    06-06-2015, 10:35 PM Go to last post
  56. Adjusted Residuals (Chi Square)

    Hello everyone, I'm looking at a group of international people that have participated in an online Dutch language course. In doing so, they were...

    Started by AThammawat‎, 06-03-2015 06:30 PM
    • Replies: 4
    • Views: 326
    06-04-2015, 04:52 AM Go to last post
  57. Factor Analysis

    An author I am reading suggest that normality in factor analysis is required. They seem to see this as an issue of the variables. Essentially a...

    Started by noetsi‎, 05-28-2015 03:13 PM
    • Replies: 4
    • Views: 444
    05-28-2015, 07:01 PM Go to last post
  58. 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: 566
    05-28-2015, 05:21 PM Go to last post
  59. Likert scale analysis

    I have no link, its a 2011 article. Wonder what others think about this .

    Started by noetsi‎, 05-28-2015 01:32 PM
    • Replies: 0
    • Views: 201
    05-28-2015, 01:32 PM Go to last post
  60. Survival Analysis Help

    Hi , This is the problem i am trying to solve for a client , and would appreciate some help : 1) I am trying to predict the "time to default"...

    Started by ZBlue‎, 05-26-2015 11:58 AM
    • Replies: 2
    • Views: 329
    05-26-2015, 01:11 PM Go to last post

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