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Forum: Applied Statistics

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

  1. 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: 95
    05-21-2015, 06:33 PM Go to last post
  2. 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: 9
    • Views: 253
    05-20-2015, 12:34 PM Go to last post
  3. 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: 59
    05-20-2015, 09:26 AM Go to last post
  4. 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: 118
    05-18-2015, 12:48 PM Go to last post
  5. 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: 1,167
    05-18-2015, 11:16 AM Go to last post
  6. 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: 114
    05-15-2015, 04:01 AM Go to last post
  7. 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: 24
    • Views: 105,587
    05-14-2015, 11:20 AM Go to last post
  8. 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: 161
    05-09-2015, 07:03 PM Go to last post
  9. 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: 202
    05-07-2015, 02:16 AM Go to last post
  10. 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: 192
    05-04-2015, 12:06 AM Go to last post
  11. 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: 162
    05-03-2015, 08:57 PM Go to last post
  12. 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: 255
    04-30-2015, 09:44 PM Go to last post
  13. 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: 120
    04-30-2015, 07:31 AM Go to last post
  14. 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: 119
    04-29-2015, 07:53 AM Go to last post
  15. 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: 262
    04-27-2015, 03:00 PM Go to last post
  16. 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: 3,701
    04-25-2015, 05:16 AM Go to last post
  17. 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: 203
    04-24-2015, 05:26 AM Go to last post
  18. 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: 134
    04-24-2015, 05:21 AM Go to last post
  19. 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: 151
    04-23-2015, 03:29 PM Go to last post
  20. 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: 138
    04-22-2015, 05:00 AM Go to last post
  21. 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: 104
    04-22-2015, 02:23 AM Go to last post
  22. 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: 180
    04-18-2015, 02:20 PM Go to last post
  23. 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: 196
    04-16-2015, 09:20 AM Go to last post
  24. 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: 123
    04-16-2015, 06:19 AM Go to last post
  25. 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: 741
    04-14-2015, 04:10 PM Go to last post
  26. 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: 249
    04-14-2015, 03:23 PM Go to last post
  27. 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: 128
    04-14-2015, 10:00 AM Go to last post
  28. Problem with output of paired Z test and normal distribution

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

    Started by Steven‎, 04-13-2015 10:03 AM
    • Replies: 0
    • Views: 130
    04-13-2015, 10:03 AM Go to last post
  29. 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: 415
    04-08-2015, 02:48 PM Go to last post
  30. 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: 19,666
    04-08-2015, 12:47 PM Go to last post
  31. 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: 183
    04-06-2015, 07:29 AM Go to last post
  32. 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: 239
    04-05-2015, 09:27 AM Go to last post
  33. 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: 162
    04-03-2015, 07:11 PM Go to last post
  34. 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: 153
    04-02-2015, 07:31 PM Go to last post
  35. 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
    • Replies: 14
    • Views: 594
    03-31-2015, 04:01 PM Go to last post
  36. 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: 432
    03-31-2015, 08:11 AM Go to last post
  37. Correlated time series at different aggregation levels

    Hi, In my time series data I discovered the following behaviour. My time series are available in 500ms intervals and are about sensor data like...

    Started by JohnMeier‎, 03-28-2015 12:10 PM
    • Replies: 0
    • Views: 229
    03-28-2015, 12:10 PM Go to last post
  38. Multiple Correlation Coefficient for Time Series?

    I am using Pearsons correlation coefficient to calculate the correlation between two time series. Now I would like to calculate the correlation...

    Started by JohnMeier‎, 03-28-2015 12:08 PM
    • Replies: 0
    • Views: 201
    03-28-2015, 12:08 PM Go to last post
  39. Statistical model selection for analysis

    Dear Users, I have set of data for analyzing tennis players wins and loss in three different court surfaces like hard, clay and grass. I would like...

    Started by rajarajan‎, 03-27-2015 12:31 AM
    • Replies: 1
    • Views: 230
    03-27-2015, 04:56 AM Go to last post
  40. ranking players based on win loss record

    I can see this is a very knowledgeable group. Sorry if this is simple/stupid. Hope someone won't mind helping. I did try searching first, but...

    Started by mpb1123‎, 03-21-2015 10:20 AM
    • Replies: 0
    • Views: 197
    03-21-2015, 10:20 AM Go to last post
  41. Question What measure of central tendency?

    Hi folks, I am currently working on an analysis of workflow duration (time elapsed between start of process A and start of process B in a...

    Started by Marc_lux‎, 03-12-2015 03:55 AM
    • Replies: 1
    • Views: 263
    03-21-2015, 04:14 AM Go to last post
  42. increasing the statistical significance of outliers

    Can someone give me some assistance on the use case below? Summary To create a Key Performance Indicator (as a percent of server utilization...

    Started by jedatt01‎, 03-19-2015 03:47 PM
    outliers, weighted average
    • Replies: 3
    • Views: 263
    03-20-2015, 02:55 AM Go to last post
  43. Valid AR and MA parameters for arima.sim()

    Hi, I did not do time series analysis for a while. The following code seems not to produce a stationary series. x <-arima.sim(n=n,...

    Started by consuli‎, 03-17-2015 02:32 PM
    • Replies: 2
    • Views: 295
    03-17-2015, 04:58 PM Go to last post
  44. 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: 0
    • Views: 288
    03-14-2015, 01:09 AM Go to last post
  45. Do i need equidistant time intervals for classification task?

    I have a dataset of the following structure and want to use it for a classification task. The first column contains the timestamp when the values...

    Started by JohnMeier‎, 03-10-2015 03:29 PM
    • Replies: 0
    • Views: 294
    03-10-2015, 03:29 PM Go to last post
  46. Can I multiply r quared with relative standard deviation

    Hello, I'm trying to compare results of my crop model against observations on crop production and am especially interested in how well the model...

    Started by Sider003‎, 03-07-2015 05:14 AM
    • Replies: 1
    • Views: 307
    03-09-2015, 10:40 AM Go to last post
  47. Probability highest value is not part of population

    Hi I've got a very simple problem but I don't know what test to use and I've been searching without success so I'd very much appreciate some help. ...

    Started by Haseler‎, 03-05-2015 03:54 PM
    highest, lowest., outlier, probability
    • Replies: 6
    • Views: 375
    03-06-2015, 08:33 AM Go to last post
  48. Time Series Hold out data not used in modeling?

    Hello everyone. It is my understanding that if one wants to built a time series model on data a time series that went from 2000 to today (2015)...

    Started by Anotherdream‎, 03-05-2015 02:09 PM
    • Replies: 2
    • Views: 199
    03-05-2015, 02:39 PM Go to last post
  49. Hey dason - unit root test

    Dason this is what I meant although I got the test wrong. "Stationarity tests have stationarity under the null hypothesis, thus reversing the null...

    Started by noetsi‎, 03-03-2015 10:39 AM
    • Replies: 3
    • Views: 295
    03-05-2015, 11:34 AM Go to last post
  50. Comparing two samples of volatility data: Some complications

    Hi guys, I'm having some problems establishing the best possible test for a comparison of two samples. Background: I'm investigating the...

    Started by AcuteApathy‎, 03-03-2015 05:02 AM
    comparisons, finance, volatility
    • Replies: 0
    • Views: 244
    03-03-2015, 05:02 AM Go to last post
  51. What does this author mean [time series]

    This comes from page 43 of "Practical Time Series Analysis Using SAS' It occurs in a section about confidence intervals. Part of my question is that...

    Started by noetsi‎, 03-02-2015 04:03 PM
    • Replies: 1
    • Views: 252
    03-02-2015, 04:28 PM Go to last post
  52. Response surface models using quantitative variables

    This relates to the mineral industry so a little context first. We are trying to estimate the uncertainty in the amount of ore that can be recovered...

    Started by pet_griffin‎, 03-02-2015 04:22 AM
    • Replies: 0
    • Views: 253
    03-02-2015, 04:22 AM Go to last post
  53. Density function of a skewed normal distribution

    Hello, for simulation purposes I want to construct a skewed normal distribution. How must I alter the density function d(z) of the (unskewed)...

    Started by consuli‎, 02-28-2015 05:41 AM
    • Replies: 4
    • Views: 371
    02-28-2015, 05:06 PM Go to last post
  54. Holt Winters assumptions (aka exponential smoothing).

    I have not found assumptions of the methods for this raised very often except for outliers. And I have seen that it is very robust to violations of...

    Started by noetsi‎, 02-27-2015 05:15 PM
    • Replies: 2
    • Views: 328
    02-27-2015, 06:14 PM Go to last post
  55. Applying Credible Intervals vs Confidence Intervals

    Hi all, Struggling through a problem at work, and we are slogging through an internal debate. We are not statisticians and rapidly finding the...

    Started by abgtr‎, 02-26-2015 01:24 AM
    • Replies: 0
    • Views: 238
    02-26-2015, 01:24 AM Go to last post
  56. Exclamation Aggregate Loss Model (Actuarial Science)

    Question: Let S be the random sum of N independent frequencies {{M_i}} where N is negative binomial distributed with r = 5 and \beta= 3 and {M_i}...

    Started by Asano‎, 02-25-2015 11:09 AM
    actuarial, aggregate, distribution, loss, science
    • Replies: 1
    • Views: 272
    02-25-2015, 01:31 PM Go to last post
  57. Basic Question: Time series at lower level forecasting?

    Hello everyone. I have what I think is a very basic question but I am greatly struggling with knowing what model to use and where to start, and all...

    Started by Anotherdream‎, 02-24-2015 09:24 PM
    • Replies: 0
    • Views: 217
    02-24-2015, 09:24 PM Go to last post
  58. Basic question- Predicting "the whole from a part"

    *********x

    Started by gregoryjgold‎, 02-24-2015 07:16 AM
    basic, predict, variance
    • Replies: 0
    • Views: 209
    02-24-2015, 07:16 AM Go to last post
  59. Statistical test for unbalance panel data

    I want to analyse the importance of an independent variable which is a dummy variable. The whole data is divided into two groups making both groups...

    Started by nidhibansal111‎, 02-23-2015 05:07 AM
    • Replies: 0
    • Views: 201
    02-23-2015, 05:07 AM Go to last post
  60. Help with Factor Analysis.

    Hello, I am trying to understand how to interpret The Rotation sum squared loading in the promax factor analysis. I am getting these 3 numbers on...

    Started by Angel‎, 02-19-2015 10:45 AM
    • Replies: 0
    • Views: 316
    02-19-2015, 10:45 AM Go to last post

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