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Forum: Applied Statistics

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

  1. 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, Yesterday 05:15 AM
    • Replies: 1
    • Views: 67
    Yesterday, 10:21 AM Go to last post
  2. 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: 1
    • Views: 100
    07-01-2015, 08:16 AM Go to last post
  3. 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: 281
    06-30-2015, 03:28 PM Go to last post
  4. 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: 0
    • Views: 65
    06-30-2015, 12:01 AM Go to last post
  5. 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: 141
    06-29-2015, 09:25 PM Go to last post
  6. 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
    4 Pages
    1 2 3 ... 4
    • Replies: 56
    • Views: 1,934
    06-29-2015, 06:55 PM Go to last post
  7. 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: 0
    • Views: 56
    06-29-2015, 04:33 PM Go to last post
  8. 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: 299
    06-29-2015, 03:11 PM Go to last post
  9. 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: 109,337
    06-29-2015, 11:58 AM Go to last post
  10. 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: 67
    06-28-2015, 03:23 AM Go to last post
  11. 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: 130
    06-27-2015, 02:28 AM Go to last post
  12. 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: 88
    06-25-2015, 06:16 PM Go to last post
  13. 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: 3
    • Views: 204
    06-25-2015, 05:37 PM Go to last post
  14. 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: 115
    06-25-2015, 09:36 AM Go to last post
  15. 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: 63
    06-25-2015, 08:57 AM Go to last post
  16. 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: 132
    06-22-2015, 03:02 PM Go to last post
  17. [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: 5,537
    06-14-2015, 02:55 PM Go to last post
  18. 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: 154
    06-11-2015, 11:16 AM Go to last post
  19. 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: 231
    06-10-2015, 03:52 AM Go to last post
  20. 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: 122
    06-09-2015, 09:59 AM Go to last post
  21. 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: 292
    06-08-2015, 02:20 AM Go to last post
  22. 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: 173
    06-06-2015, 10:35 PM Go to last post
  23. 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: 270
    06-04-2015, 04:52 AM Go to last post
  24. 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: 361
    05-28-2015, 07:01 PM Go to last post
  25. 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: 489
    05-28-2015, 05:21 PM Go to last post
  26. 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: 139
    05-28-2015, 01:32 PM Go to last post
  27. 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: 267
    05-26-2015, 01:11 PM Go to last post
  28. 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: 245
    05-21-2015, 06:33 PM Go to last post
  29. 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: 130
    05-20-2015, 09:26 AM Go to last post
  30. 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: 189
    05-18-2015, 12:48 PM Go to last post
  31. 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: 1,376
    05-18-2015, 11:16 AM Go to last post
  32. 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: 166
    05-15-2015, 04:01 AM Go to last post
  33. 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: 212
    05-09-2015, 07:03 PM Go to last post
  34. 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: 239
    05-07-2015, 02:16 AM Go to last post
  35. 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: 247
    05-04-2015, 12:06 AM Go to last post
  36. 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: 205
    05-03-2015, 08:57 PM Go to last post
  37. 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: 287
    04-30-2015, 09:44 PM Go to last post
  38. 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: 169
    04-30-2015, 07:31 AM Go to last post
  39. 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: 160
    04-29-2015, 07:53 AM Go to last post
  40. 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: 315
    04-27-2015, 03:00 PM Go to last post
  41. 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: 3,843
    04-25-2015, 05:16 AM Go to last post
  42. 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: 237
    04-24-2015, 05:26 AM Go to last post
  43. 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: 188
    04-24-2015, 05:21 AM Go to last post
  44. 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: 197
    04-23-2015, 03:29 PM Go to last post
  45. 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: 192
    04-22-2015, 05:00 AM Go to last post
  46. 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: 159
    04-22-2015, 02:23 AM Go to last post
  47. Question Time varying Cox regression using SPSS

    Dear all, I need help regarding data set up and the right command for time varying dependent variables. I am using financial data and for that I...

    Started by roslina‎, 04-18-2015 02:20 PM
    • Replies: 0
    • Views: 237
    04-18-2015, 02:20 PM Go to last post
  48. Standard deviatiom of percentage changes

    Hi all, I need to calculate de standard deviation of a percentage changes time series. This time series shows the changes in sales versus the same...

    Started by afabris‎, 04-16-2015 09:20 AM
    • Replies: 0
    • Views: 244
    04-16-2015, 09:20 AM Go to last post
  49. Question Help with Sequential Sampling where H0 is that both samples are same distribution

    Hi, I wonder if anyone could advise? My aim is to compare the results of two randomized algorithms to prove that one does better than the other....

    Started by Geoff‎, 04-16-2015 06:19 AM
    hypotheses testing, sequential sampling, sprt
    • Replies: 0
    • Views: 175
    04-16-2015, 06:19 AM Go to last post
  50. Methods section- can I use the term inferential statistics if I dont have a sample

    I am writing a report and need to write a very brief method section. I basically describe my sample (frequencies), some cross tabulations, and see...

    Started by Marvin85‎, 04-06-2015 04:42 PM
    2 Pages
    1 2
    inferential, methods
    • Replies: 15
    • Views: 918
    04-14-2015, 04:10 PM Go to last post
  51. What does p really mean.

    In trying to help another poster I realized that I did not understand this for sure myself. I suspect that, like me, many analyst analyze samples...

    Started by noetsi‎, 04-14-2015 10:30 AM
    • Replies: 7
    • Views: 360
    04-14-2015, 03:23 PM Go to last post
  52. comparing the performance of 2 securities

    Hi, To have a measure of the performance of a security I want to use the Jensen's Alpha (from the CAPM). I was just thinking, if I want to...

    Started by dstat2‎, 04-14-2015 10:00 AM
    jensen's ajpha, kolmogorov smirnov, stock performance
    • Replies: 0
    • Views: 180
    04-14-2015, 10:00 AM Go to last post
  53. Problem with output of paired Z test and normal distribution

    Hello all, I’m Steven and I’m working on a project with spectra. The case is to distinguish objects based on their spectrum. Now I’m trying to...

    Started by Steven‎, 04-13-2015 10:03 AM
    • Replies: 0
    • Views: 180
    04-13-2015, 10:03 AM Go to last post
  54. How should I forecast given the data?

    Hello all, First let me say I am not sure if this is the right section of the forum. Below you will find the data I am working with in graphical...

    Started by bigbob‎, 04-05-2015 07:49 PM
    • Replies: 5
    • Views: 507
    04-08-2015, 02:48 PM Go to last post
  55. Logit v. Probit: A fight to the death

    Every now and then I have to work with binary responses with continuous covariates. So of course this screams generalized linear model. The...

    Started by Dason‎, 09-13-2011 09:59 PM
    5 Pages
    1 2 3 ... 5
    logit, probit
    • Replies: 67
    • Views: 20,259
    04-08-2015, 12:47 PM Go to last post
  56. How to speed up your computations in R: a ts inspired paper.

    Hi everyone, quark requested that we highlight this paper on TS. Many of you are already aware of this paper. The article is open access, and...

    Started by TheEcologist‎, 04-06-2015 06:36 AM
    • Replies: 1
    • Views: 247
    04-06-2015, 07:29 AM Go to last post
  57. Control Variables

    Hello everyone, New member here. Im currently writing an econometrics paper for my honours thesis. My topic is along the lines of corporate social...

    Started by salata91‎, 04-03-2015 09:15 PM
    • Replies: 2
    • Views: 311
    04-05-2015, 09:27 AM Go to last post
  58. individual-level random effects and the idiosyncratic error

    Can anyone explain how some of the explanatory variables could be correlated with individual-level random effects, but that none of the explanatory...

    Started by Alexander8‎, 04-03-2015 07:11 PM
    econometrics
    • Replies: 0
    • Views: 227
    04-03-2015, 07:11 PM Go to last post
  59. How to set up manova in MATLAB for multifactor analysis

    I have 4 independent variables: Frequency (within-subjects, continuous, 16 levels) Amplitude (within-subjects, continuous, 3 levels) Time...

    Started by rorytheherb‎, 04-02-2015 07:31 PM
    between-subjects, manova, matlab, repeated measures, within-subjects
    • Replies: 0
    • Views: 213
    04-02-2015, 07:31 PM Go to last post
  60. SEM and normality

    Been a while since I worked with SEM. This puzzled me as I thought multivariate normality, the normality of the residuals was what mattered in...

    Started by noetsi‎, 03-30-2015 11:48 AM
    • Replies: 13
    • Views: 565
    03-31-2015, 08:11 AM Go to last post

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