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Forum: Applied Statistics

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

  1. Is it appropriate to not compare all samples and rather 2 of them and another 2?

    Iím preparing within a group repeated measures study with duration of 3 weeks. 1st week - no technique is applied, itís a control group, 2nd week -...

    Started by Alyona‎, 05-27-2017 02:21 AM
    • Replies: 0
    • Views: 94
    05-27-2017, 02:21 AM Go to last post
  2. Frequent user of ED

    At work we have 213 patients who were identified as frequent users of the emergency department in a hospital. These patients have over the last...

    Started by scotchpie‎, 05-24-2017 04:13 AM
    • Replies: 3
    • Views: 184
    05-26-2017, 10:15 PM Go to last post
  3. test of proportion

    I have forgotten my basic statistics... I have a group of people who answered two different questions. I have been asked to do a test of...

    Started by noetsi‎, 05-25-2017 10:55 AM
    • Replies: 3
    • Views: 137
    05-25-2017, 01:26 PM Go to last post
  4. Multilevel analysis

    This is a thread on the wonderful world of multilevel analysis which is called many different things by various authors. This is the type of...

    Started by noetsi‎, 05-01-2017 11:08 AM
    • Replies: 14
    • Views: 463
    05-23-2017, 01:42 PM Go to last post
  5. MC on Regression Analysis

    I wanted to check over my answers based on these practice questions. Thanks (1) True/False: Clustering is an unsupervised learning problem. (2)...

    Started by shane414‎, 05-22-2017 04:21 PM
    regression analysis
    • Replies: 0
    • Views: 181
    05-22-2017, 04:21 PM Go to last post
  6. Polynomial Regression - Advice please

    Sorry if i'm posting this twice, received an error first time around. Im trying to develop some kind of statistical model that lets me estimate sales...

    Started by TollemG‎, 05-19-2017 06:13 PM
    • Replies: 1
    • Views: 179
    05-22-2017, 07:20 AM Go to last post
  7. Problem finding a fitting statistical test

    Hi. I'm conducting a study, where i am evaluating valuations of companies written by students in their master theses'. In these papers they are...

    Started by Budie‎, 05-16-2017 11:50 AM
    • Replies: 0
    • Views: 170
    05-16-2017, 11:50 AM Go to last post
  8. Leverage analysis for groups of outliers

    There are a wide range of statistics that deal with leverage of individual data points (that is their impact on the regression line such as DFBETA)....

    Started by noetsi‎, 05-09-2017 10:58 AM
    • Replies: 6
    • Views: 388
    05-11-2017, 02:08 PM Go to last post
  9. Merging Relevant Statistics

    I'm currently working on a computer science project that can tell a user how good a particular phrase for a given product is. The particular product...

    Started by mjsweet‎, 05-07-2017 03:59 PM
    • Replies: 0
    • Views: 166
    05-07-2017, 03:59 PM Go to last post
  10. How to segment customers by demographic data to maximize profit?

    I have a data set with profit for each customer (in some cases it is negative) as well as various demographic categorical variables (gender, age...

    Started by tennisfan‎, 04-17-2017 09:36 AM
    customer analytics, demographics, maximization, profit
    • Replies: 3
    • Views: 307
    05-03-2017, 08:31 AM Go to last post
  11. Statistical results of continuous, finite, closed form functions

    I've done a lot of digging but all the keywords point to continuous random variables, and that's not what I'm interested in. I'm interested in the...

    Started by Dunce‎, 05-02-2017 05:17 PM
    • Replies: 0
    • Views: 177
    05-02-2017, 05:17 PM Go to last post
  12. Applying statistical analysis with multiple combinations?

    Would this just be performed through minitab by looking at interaction plots?

    Started by jki‎, 04-28-2017 09:45 PM
    • Replies: 1
    • Views: 215
    05-01-2017, 11:03 AM Go to last post
  13. Bayesian (structural) VAR model problems

    Hello, I will use a bayesian structural vector autoregressive model for a macroeconomic paper. It is very hard to find answers to many questions in...

    Started by schteeke1‎, 04-25-2017 06:57 AM
    bayesian var lag length
    • Replies: 0
    • Views: 236
    04-25-2017, 06:57 AM Go to last post
  14. copula-based VaR calculation in R

    I'm working on a value-at-risk calculation using copulas on different stock market indices. I know how to fit the copula, but I can't figure out how...

    Started by maaarten9‎, 04-23-2017 11:24 AM
    copula, rsoftware, value at risk
    • Replies: 0
    • Views: 211
    04-23-2017, 11:24 AM Go to last post
  15. 2-D scatterplot question...how to assign a single numerical value to each data point

    Greetings, I am building and looking at scatterplots comparing two different sets of data. I would like to be able to compare the data using a...

    Started by SBF12345‎, 04-20-2017 05:46 PM
    • Replies: 0
    • Views: 214
    04-20-2017, 05:46 PM Go to last post
  16. Calculating median category

    I have ordered categories (e.g., 0-3 months, 4-6 months) and the number of customers who were in each category (say 45 in the first 50 in the second,...

    Started by noetsi‎, 04-17-2017 05:51 PM
    • Replies: 0
    • Views: 222
    04-17-2017, 05:51 PM Go to last post
  17. Lightbulb Baseball Stats: Using Multiple Factors With Variable Ranges As Input

    Hello, I am working on creating a statistic to predict players most likely to get a hit on any given day. In this statistic, I am using five...

    Started by Eric Alan‎, 04-12-2017 10:45 PM
    baseball, multiple data sets, normalize dataset, range, weighted
    • Replies: 0
    • Views: 240
    04-12-2017, 10:45 PM Go to last post
  18. Manova

    I have at least 20 recipes each with 8 different chemicals. each of these 20 recipes produces at least 2 outcomes that is dependent varaibles. What...

    Started by madyira‎, 04-10-2017 09:35 AM
    • Replies: 1
    • Views: 255
    04-10-2017, 10:03 AM Go to last post
  19. How to amend one variable in a Full Factorial Design during experimentation

    I have a 2 level, 4 factor DOE set up for 16 runs. These are all continuous factors. I'd like to amend one of the factors to a narrower range. I am...

    Started by redrover123‎, 04-07-2017 04:46 PM
    • Replies: 4
    • Views: 315
    04-10-2017, 06:48 AM Go to last post
  20. Fundraising Evaluation Design

    I work for a nonprofit that is hoping to determine whether or not certain corporate parameters are correlated with joining our organization as a...

    Started by clcrabtr‎, 04-03-2017 08:55 AM
    • Replies: 3
    • Views: 341
    04-03-2017, 10:28 AM Go to last post
  21. Question on forecast combinations

    Hi All, Say I have a variable Z that I believe can modelled/forecasted via two different thematic models in the standard regression form: E1 =...

    Started by nomadzero‎, 04-03-2017 04:07 AM
    • Replies: 0
    • Views: 185
    04-03-2017, 04:07 AM Go to last post
  22. Hodrick-Prescott issue

    Hi, I'm building a Leading Indicator for the economic cycle similar to the OECD's (http://www.oecd.org/std/leading-indicators/), so I use...

    Started by pgrign‎, 04-03-2017 03:01 AM
    • Replies: 0
    • Views: 179
    04-03-2017, 03:01 AM Go to last post
  23. graduating multi-decrement tables

    I need to construct a multi-decrement table and I've had much success withestimation of crude rates, but now I feel that I need to graduate the rates...

    Started by chippy‎, 03-28-2017 10:57 AM
    decrements, estimation
    • Replies: 2
    • Views: 374
    04-01-2017, 11:54 PM Go to last post
  24. What do statistical tests really do

    The background. We generated customer to counselor ratios for our counties (these are population data not a survey. That is we queried all our...

    Started by noetsi‎, 03-02-2017 03:27 PM
    3 Pages
    1 2 3
    • Replies: 43
    • Views: 3,578
    04-01-2017, 11:50 PM Go to last post
  25. Measuring the effect of in-store Promotions

    Hello, I am testing the effect of a new in-store promotion technique (treatment). It is applied during product promotions, as a compliment to...

    Started by KARPOS‎, 03-30-2017 11:58 AM
    applied statistics, confidence interval, probability, regression model
    • Replies: 1
    • Views: 270
    04-01-2017, 11:38 PM Go to last post
  26. log(0) should have a real value!!!

    Dear all, Iíve been stuck for quite some time with a problem that relates to use of log-scale with values that equal zero. My data comes from...

    Started by ritmaniac‎, 03-21-2017 07:04 AM
    anova, censoring, linear regression, log scale, log transformation, logarithmic
    • Replies: 4
    • Views: 469
    03-27-2017, 11:27 AM Go to last post
  27. Is R square useful at all?

    I know it can not be used in non-linear regression at all but I found this comment a bit shocking given how commonly R square is in the literature....

    Started by noetsi‎, 03-20-2017 02:47 PM
    r^2
    • Replies: 11
    • Views: 724
    03-26-2017, 11:32 AM Go to last post
  28. When the central limit theorem works...and when it doesn't?

    I had always thought that given say a 100 cases the central limit theorem always worked. But today I read (in a book about multilevel analysis)...

    Started by noetsi‎, 03-20-2017 11:35 AM
    • Replies: 10
    • Views: 497
    03-22-2017, 06:09 PM Go to last post
  29. Multiple hypothesis testing

    I am reading one of those books that make my head hurt, because it raises many issues and disagrees with what to me is established views on a topic...

    Started by noetsi‎, 03-20-2017 12:02 PM
    • Replies: 10
    • Views: 539
    03-22-2017, 02:11 PM Go to last post
  30. Question comparison of multivariate (4 DV and 1 IV) datasets (data matrices)

    I want to compare 06 different Multivariate datasets (data matrices). Each dataset consists of SAME number of columns but different number of rows....

    Started by waqasurrehman‎, 03-20-2017 05:51 AM
    multivariate, pca analysis
    • Replies: 0
    • Views: 315
    03-20-2017, 05:51 AM Go to last post
  31. Good measure of non-linear correlation

    Many of the measures of correlation, notably pearson but I think Spearman rho as well, do not measure non-linear relationships well. Are there any...

    Started by noetsi‎, 03-17-2017 02:22 PM
    • Replies: 5
    • Views: 588
    03-18-2017, 03:50 AM Go to last post
  32. Question Conditional Multi-variate Normal Distribution

    Dear all, I would like to find a computationally quick and sufficiently accurate way (i.e., either analytically or numerical approximation) to...

    Started by sdj‎, 03-17-2017 05:03 PM
    conditional density, multivariate normal
    • Replies: 0
    • Views: 349
    03-17-2017, 05:03 PM Go to last post
  33. Bootstrapping 0.632+ AUC with fixed test sets

    Hi, I want to compare different binary classifiers in terms of their AUC values on test sets. I have data over one year with about 2000...

    Started by Mkkl‎, 03-11-2017 06:00 AM
    auc, bootstrap, efron, fixed, test set
    • Replies: 0
    • Views: 480
    03-11-2017, 06:00 AM Go to last post
  34. Question How to assign new data to an existing clustering

    This is the situation. First, I performed factor analysis on 20 continuous variables, and reduced those to 10 factors using SPSS. Then, I did...

    Started by wmacooper‎, 03-08-2017 11:06 AM
    cluster analysis, factor analysis, prediction model, spss
    • Replies: 0
    • Views: 536
    03-08-2017, 11:06 AM Go to last post
  35. Using the Excel Rand() Function in Sampling

    I have quick question with regards to using the Excel's Rand() function. Please see the below link for the excel spreadsheet example. My...

    Started by R2015‎, 03-07-2017 09:58 AM
    • Replies: 1
    • Views: 428
    03-07-2017, 10:42 AM Go to last post
  36. Looking for feedback on application of chi-square test

    I am a cost engineer working in the building construction field. I am seeking some advice/feedback on the use of a chi-square test for assessing how...

    Started by Pickle57‎, 03-03-2017 11:38 AM
    chi-square help, multinomial
    • Replies: 5
    • Views: 585
    03-04-2017, 02:14 PM Go to last post
  37. Proof of Kalman filter related lema

    Hi... Can you please provide a proof of the formula given on the attached image?

    Started by liqokeli‎, 03-03-2017 09:36 AM
    • Replies: 0
    • Views: 416
    03-03-2017, 09:36 AM Go to last post
  38. Help with measurement system analysis with destructive samples

    Hello everyone, I am an internship student and for my company I have to develop a method to test if their material is brittle or not. They bought...

    Started by biochem95‎, 02-28-2017 07:46 AM
    gage r&r, minitab, msa
    • Replies: 2
    • Views: 619
    03-02-2017, 01:35 PM Go to last post
  39. Deciding what distribution to use in a monte carlo distribution (business)

    I am not working on a specific problem right now - just learning how to do monte carlo for business uses (so I am not testing a specific statistic,...

    Started by noetsi‎, 02-28-2017 03:59 PM
    • Replies: 6
    • Views: 874
    03-01-2017, 11:18 AM Go to last post
  40. What type of analysis is this?

    This is exactly the type of analysis I need to learn to do, but I don't know where to look for it. Is it finance, operations research, planning.... ...

    Started by noetsi‎, 02-28-2017 04:25 PM
    • Replies: 3
    • Views: 798
    03-01-2017, 09:18 AM Go to last post
  41. Exercise on standard distribution

    Hello, Suppose I want to calculate the probability for a user to pass from a basic to a premium account within the end of Q1 (i.e. end of march). ...

    Started by faber1999‎, 02-26-2017 10:35 AM
    gaussian distribution, normal distribution, probability estimate, standarddeviation
    • Replies: 0
    • Views: 1,031
    02-26-2017, 10:35 AM Go to last post
  42. 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: 26
    • Views: 186,103
    02-23-2017, 10:18 AM Go to last post
  43. Monte Carlo simulations

    I am not using this to test the results of violations of statistical assumptions or the like. I am using it to analyze business issues for which no...

    Started by noetsi‎, 02-10-2017 04:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 2,734
    02-22-2017, 03:15 PM Go to last post
  44. Lightbulb How to compare two PCA vectors - classification and clustering problem

    Dear all, Assume I have one reference PCA vector and two sample PCA vectors, all of the same length. I want to know which of the two sample PCA's...

    Started by horek‎, 02-22-2017 02:46 PM
    principal components
    • Replies: 0
    • Views: 543
    02-22-2017, 02:46 PM Go to last post
  45. interpreting random effects in a GLMM

    I just want to check with everyone about my interpretation of a model results. I am beginning to second guess myself so I want to make sure I am...

    Started by the42up‎, 02-21-2017 09:02 PM
    • Replies: 0
    • Views: 557
    02-21-2017, 09:02 PM Go to last post
  46. Generalized Linear Models

    Anyone know a good introductory book or books on Generalized Linear Models. I have worked with these before, but need to learn them better. I am...

    Started by noetsi‎, 02-10-2017 02:38 PM
    • Replies: 1
    • Views: 774
    02-19-2017, 04:10 PM Go to last post
  47. [SOLVED] very simple logic question

    This is probably the simplest question ever asked here.....:shakehead I have been asked for the average time customers spent in a given service. ...

    Started by noetsi‎, 02-16-2017 05:30 PM
    • Replies: 4
    • Views: 1,083
    02-17-2017, 05:07 PM Go to last post
  48. Time series thread

    These don't get much attention now that vinux is rarely here.... In ARIMA models you sometimes have to test for seasonal non-Stationarity. One way...

    Started by noetsi‎, 01-14-2017 01:51 PM
    • Replies: 12
    • Views: 2,759
    02-02-2017, 11:34 AM Go to last post
  49. Mixing populations

    I'm not al that familiar with statistics, so I hope I use the correct terminology. In most materials you get some normal distribution of the values...

    Started by Descobar‎, 01-30-2017 07:28 AM
    • Replies: 12
    • Views: 1,428
    02-01-2017, 03:15 AM Go to last post
  50. Smile Comparing subsets of a population with a very different size (power law case)?

    My population (12000 data) is characterized by events that are either of type A or of type B. My goal is to figure out whether the relative...

    Started by angy‎, 01-30-2017 05:11 AM
    power law, proportion, statistical significance
    • Replies: 0
    • Views: 866
    01-30-2017, 05:11 AM Go to last post
  51. Calculating Optimal Level of Maintenance Spend

    New to this forum and my stat skills have gotten quite rusty since earning my six sigma bb 8 years ago. Coming here to Basically I want to figure...

    Started by TollemG‎, 01-19-2017 09:41 AM
    • Replies: 7
    • Views: 2,050
    01-27-2017, 03:46 PM Go to last post
  52. Standard deviation for final results

    Hi, I have several groups of samples which each group has own average and SD. I use the average of each group to calculate the difference between...

    Started by Neos‎, 01-27-2017 07:16 AM
    average, standard deviation
    • Replies: 0
    • Views: 825
    01-27-2017, 07:16 AM Go to last post
  53. Question Applying Principal Coponent Analysis to Exchange Profit of a company

    Hi, I have monthly exchange profit of a company for last 10 years period and daily exchange rates for 10 year period. I want to identify what...

    Started by John267‎, 01-24-2017 06:05 AM
    • Replies: 0
    • Views: 974
    01-24-2017, 06:05 AM Go to last post
  54. Comparing different optimisation agorithms on multiple test functions

    Hi, I'm trying to compare the performance of 4 optimisation algorithms on over 30 fitness functions. Due to the nature of the algorithm variations I...

    Started by JoeWright‎, 01-21-2017 07:10 PM
    • Replies: 0
    • Views: 1,005
    01-21-2017, 07:10 PM Go to last post
  55. Re: Permanova design for BACI study (using Primer)

    Hello everyone I am a beginner with PRIMER, could anyone help me in designing my PERMANOVA please... I have unbalanced BACI design as following: 2...

    Started by Ahmed Faraj‎, 01-19-2017 03:56 PM
    • Replies: 1
    • Views: 1,166
    01-19-2017, 05:11 PM Go to last post
  56. Empirical method for % training test

    When I am determining a percentage training test sets is there an emprical way to determine this?

    Started by trinker‎, 01-18-2017 12:29 PM
    • Replies: 6
    • Views: 1,495
    01-18-2017, 10:50 PM Go to last post
  57. Forcast changes in th failure rate while considering feedback loop of failed "entity"

    Hi there How would you forecast changes in the failure rate of an assembly line if failed modules are fed back into the assembly line? If a...

    Started by Alex2605‎, 01-18-2017 11:23 AM
    assembly process, failure rate, feedback loop
    • Replies: 0
    • Views: 1,083
    01-18-2017, 11:23 AM Go to last post
  58. Two effects, but not enough samples - what statistics can I do?

    Dear all, I made measurements of oxygen consumption (VO2) during steady state running with 3 different shoes. The runs were performed in 5 series...

    Started by Jurij‎, 01-17-2017 08:46 AM
    linear model, two effects
    • Replies: 2
    • Views: 1,276
    01-18-2017, 03:22 AM Go to last post
  59. Accuracy calculation

    Hi all, This is probably basic stuff for some of them but it's the first time I come across this type of problem. I need to demonstrate that the...

    Started by mgubellini‎, 12-19-2016 12:12 PM
    • Replies: 2
    • Views: 1,810
    01-16-2017, 03:29 AM Go to last post
  60. Modern approaches to identifying ARIMA models.

    I have read there are new, somewhat automated, approaches to identifying the correct ARIMA (p,d,q) model. The only one I know of is the use of the...

    Started by noetsi‎, 01-14-2017 01:12 PM
    • Replies: 1
    • Views: 1,348
    01-15-2017, 12:27 PM Go to last post

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