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Forum: Applied Statistics

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

  1. 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: 10
    • Views: 275
    Yesterday, 03:55 PM Go to last post
  2. 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: 414
    07-28-2015, 02:33 PM Go to last post
  3. 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: 109
    07-27-2015, 11:25 AM 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
    6 Pages
    1 2 3 ... 6
    • Replies: 78
    • Views: 2,830
    07-27-2015, 10:40 AM Go to last post
  5. 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: 69
    07-26-2015, 09:10 AM Go to last post
  6. 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: 1
    • Views: 109
    07-25-2015, 01:18 PM Go to last post
  7. 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: 117
    07-22-2015, 07:03 PM Go to last post
  8. 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: 241
    07-21-2015, 07:08 AM Go to last post
  9. 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: 81
    07-21-2015, 01:56 AM Go to last post
  10. 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: 109
    07-17-2015, 04:49 AM Go to last post
  11. 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: 216
    07-14-2015, 06:55 AM Go to last post
  12. 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: 227
    07-09-2015, 10:00 AM Go to last post
  13. 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: 311
    07-09-2015, 09:51 AM Go to last post
  14. 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: 205
    07-09-2015, 02:34 AM Go to last post
  15. 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: 170
    07-07-2015, 11:31 AM Go to last post
  16. 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: 119
    07-07-2015, 10:12 AM Go to last post
  17. 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: 277
    07-06-2015, 02:45 PM Go to last post
  18. 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: 179
    07-04-2015, 11:10 AM Go to last post
  19. 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: 275
    07-04-2015, 08:15 AM Go to last post
  20. 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: 94
    07-03-2015, 09:27 AM Go to last post
  21. 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: 10
    • Views: 381
    06-30-2015, 03:28 PM Go to last post
  22. 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: 201
    06-29-2015, 09:25 PM Go to last post
  23. 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: 513
    06-29-2015, 03:11 PM Go to last post
  24. 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: 111,970
    06-29-2015, 11:58 AM Go to last post
  25. 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: 114
    06-28-2015, 03:23 AM Go to last post
  26. 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: 190
    06-27-2015, 02:28 AM Go to last post
  27. 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: 139
    06-25-2015, 06:16 PM Go to last post
  28. 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: 164
    06-25-2015, 09:36 AM Go to last post
  29. 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: 100
    06-25-2015, 08:57 AM Go to last post
  30. 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: 168
    06-22-2015, 03:02 PM Go to last post
  31. [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: 5,816
    06-14-2015, 02:55 PM Go to last post
  32. 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: 187
    06-11-2015, 11:16 AM Go to last post
  33. 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: 264
    06-10-2015, 03:52 AM Go to last post
  34. 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: 151
    06-09-2015, 09:59 AM Go to last post
  35. 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: 327
    06-08-2015, 02:20 AM Go to last post
  36. 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: 193
    06-06-2015, 10:35 PM Go to last post
  37. 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: 293
    06-04-2015, 04:52 AM Go to last post
  38. 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: 394
    05-28-2015, 07:01 PM Go to last post
  39. 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: 523
    05-28-2015, 05:21 PM Go to last post
  40. 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: 176
    05-28-2015, 01:32 PM Go to last post
  41. 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: 297
    05-26-2015, 01:11 PM Go to last post
  42. Creating a Segmentation Model

    Hello, I'm not sure if this is the right forum to post my question. I'm very new to Data Science and R (my background is actually in Finance); I...

    Started by janeml06‎, 05-21-2015 05:43 PM
    • Replies: 1
    • Views: 271
    05-21-2015, 06:33 PM Go to last post
  43. Question WHO BMI z-transformation

    Hi folks, I'm trying to z-transform children's BMI scores for a study. The WHO document with the relevant formulae (attached) isn't very clear on...

    Started by BLT‎, 05-19-2015 10:40 PM
    • Replies: 1
    • Views: 163
    05-20-2015, 09:26 AM Go to last post
  44. What does a "finite sample" mean in practice.

    This is simply an example of the issue I am addressing; In practice when is the sample large enough that asymptotic properties apply (that...

    Started by noetsi‎, 05-18-2015 11:01 AM
    • Replies: 2
    • Views: 217
    05-18-2015, 12:48 PM Go to last post
  45. Best Practice Time Series Analysis

    Hello, I have got a general question. Should trend models like y(t)= b(0)+ b(1)*t y(t)= b(0)+ b(1)*t+ b(2)* t^2 y(t)= b(0)* exp in case...

    Started by consuli‎, 03-15-2015 11:05 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 1,442
    05-18-2015, 11:16 AM Go to last post
  46. Generate weighted multidimensional index with Likert-data

    Dear all, I am a bit desperate and hope you can help me with my issue. I'm analyzing the economic attractiveness of several countries. To do so,...

    Started by mibikeks‎, 05-15-2015 04:01 AM
    index models, likert, likert scale analysis, weighted
    • Replies: 0
    • Views: 186
    05-15-2015, 04:01 AM Go to last post
  47. Multiple Linear Regression

    Hello, Im trying to forecast an economic predictor and our professor hasn't been very clear as to what to do for this project. I know I am...

    Started by Kornalsofkern‎, 05-09-2015 07:03 PM
    economics, forecast, regression
    • Replies: 0
    • Views: 237
    05-09-2015, 07:03 PM Go to last post
  48. Experimental statistics. t-test and normality.

    Hi, i'm currently writhing my bachelor thesis, where i have run an experiment on 31 of my fellow students. Each participant have walked on a...

    Started by Norseman‎, 05-07-2015 02:16 AM
    • Replies: 0
    • Views: 277
    05-07-2015, 02:16 AM Go to last post
  49. Time series Analysis : Vector autoregression in R

    I am finding relation between two time series M & M1. M and M1 both found to be stationary at first difference and also cointegrated at first...

    Started by TheMonkster‎, 05-04-2015 12:06 AM
    autoregression, cointegration, time series analysis, vecm
    • Replies: 0
    • Views: 283
    05-04-2015, 12:06 AM Go to last post
  50. Lag polynomial with argument in time series

    I'm following http://faculty.chicagobooth.edu/john.cochrane/research/papers/time_series_book.pdf to ramp up on time series (my background is Elec...

    Started by JustAengineer‎, 05-03-2015 01:08 PM
    • Replies: 1
    • Views: 226
    05-03-2015, 08:57 PM Go to last post
  51. Which test - most frequently observed species - chi-square, nonparametric or poisson?

    I work for a community group restoring beaches. We've done some preliminary investigation of the vegetation along a shoreline to compare against...

    Started by MangroveJock‎, 04-30-2015 08:01 PM
    • Replies: 1
    • Views: 317
    04-30-2015, 09:44 PM Go to last post
  52. Vector model for unfolding

    Hi, I am trying to understand this multivariate statistical techniques (dimension reduction) which is similar to PCA. It consists of calculating...

    Started by Ted Brasil‎, 04-30-2015 07:31 AM
    • Replies: 0
    • Views: 198
    04-30-2015, 07:31 AM Go to last post
  53. Time series Analysis

    I have 4 time series.One of them is stationary and rest of them are not.I need to find relation between them.I will use AIC to decide lag...

    Started by TheMonkster‎, 04-29-2015 07:53 AM
    cointegration, time series, var, vecm
    • Replies: 0
    • Views: 183
    04-29-2015, 07:53 AM Go to last post
  54. Bootstrapping question

    I am brand new to this method and I had a question. I did a 1000 replications of a data base and then ran regression on these. The average value for...

    Started by noetsi‎, 04-27-2015 10:47 AM
    • Replies: 10
    • Views: 350
    04-27-2015, 03:00 PM Go to last post
  55. Scatterplots with large data sets

    Scatter plots, for example to detect non-linarity, or seperately review of residuals for regression diagnostics are commonly recommended. However,...

    Started by noetsi‎, 01-05-2012 09:57 AM
    • Replies: 9
    • Views: 3,954
    04-25-2015, 05:16 AM Go to last post
  56. Modeling parking meter usage with data from just smartphone payments

    How could a municipality extrapolate usage data from the revenues from smartphone users (56% in DC per http://goo.gl/WpGyuc) to accurately model...

    Started by cattledog‎, 04-21-2015 04:02 PM
    • Replies: 1
    • Views: 263
    04-24-2015, 05:26 AM Go to last post
  57. Process capability - Negative Binomial

    Dear All, I have attribute that show overdispersion and seem to be distributed according to a negative binomial distribution. I have the...

    Started by ferbg‎, 04-22-2015 02:40 AM
    attribute data, negative binomial, poisson, process capability
    • Replies: 1
    • Views: 227
    04-24-2015, 05:21 AM Go to last post
  58. Audit Sample Size

    Attempting to complete an audit of personnel files. The total population is 393. Each personnel file should have 4 documents. A missing document...

    Started by rlmx‎, 04-23-2015 03:29 PM
    • Replies: 0
    • Views: 222
    04-23-2015, 03:29 PM Go to last post
  59. Smile Grouping data segments and applying % modifiers to maximise output

    I'm trying to determine the best way to approach an optimization problem, but have been struggling to determine what statistical methods are...

    Started by samg86‎, 04-22-2015 05:00 AM
    methodology, optimization, permutation
    • Replies: 0
    • Views: 218
    04-22-2015, 05:00 AM Go to last post
  60. Urgent help needed: can I take mean of correlation coeficients?

    Historic market (Cash) prices and future contract prices are available for last 4 years. I have found correlation between Jan'11 market price with...

    Started by TheMonkster‎, 04-21-2015 11:44 PM
    cointegration, correlation analysis, hedging
    • Replies: 1
    • Views: 179
    04-22-2015, 02:23 AM Go to last post

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