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Forum: Applied Statistics

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

  1. How to calculate Grubb's critical value (for an outlier test)

    Dear all, I'm trying to calculate Grubb's critical value to find outliers. I found a table with 100 values for alpha=0.05...

    Started by luks‎, 09-04-2017 04:26 AM
    • Replies: 1
    • Views: 152
    09-17-2017, 07:08 PM Go to last post
  2. Forecasting times eries with different daily length

    Hey everybody! Iíve been tasked by my company to forecast the amount of phone calls on an hourly basis during the companyís opening hours. ...

    Started by Steinberg‎, 09-14-2017 01:48 AM
    forecast, sas, timeseries
    • Replies: 4
    • Views: 219
    09-15-2017, 01:26 AM Go to last post
  3. Estimating Interaction effects SVAR

    Dear all, at the moment, I am struggling with estimating interaction effects with a SVAR approach. I've already set-up VAR and SVAR models in R...

    Started by Robby‎, 09-06-2017 07:13 AM
    • Replies: 4
    • Views: 235
    09-06-2017, 07:32 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
    3 Pages
    1 2 3
    • Replies: 44
    • Views: 3,762
    09-05-2017, 01:11 PM Go to last post
  5. Chow test to compare regression models with different parameters

    Hi, I have some questions about chow test. Letís say what I am doing is: I have a set of house sale data (n = 30000) and somehow I divided it into...

    Started by ESR6‎, 09-04-2017 05:14 AM
    • Replies: 1
    • Views: 83
    09-04-2017, 11:25 PM Go to last post
  6. Compare different methods for classifying two datasets

    I'm not sure if this question is Applied Statistics, my apologies if it isn't. I have different implementations of different classification models...

    Started by pablrodr‎, 08-29-2017 08:31 AM
    classification methods
    • Replies: 9
    • Views: 357
    08-29-2017, 01:30 PM Go to last post
  7. Separating 5 item construct with scale 1-7 in three groups

    Hi there! I would like to separate my 5 item questionnaire construct (with a scale from 1 to 7) in three groups (1 (low) - 2 (middle) - 3 (high)) to...

    Started by Wunschpunsch‎, 08-25-2017 11:34 AM
    group differences, questionnaire
    • Replies: 2
    • Views: 249
    08-25-2017, 01:24 PM Go to last post
  8. Question DoE, RSM: What does Factor A*Factor A mean?

    Hello everyone, For my thesis I have to make an optimization using DoE. Most of it is clear to me now, but there is one thing which i don't quite...

    Started by michelborstrok‎, 08-19-2017 03:07 AM
    • Replies: 3
    • Views: 378
    08-19-2017, 11:02 AM Go to last post
  9. Looking for a simple random biased method to order a set

    I am looking for a sampling method with the following caracterŪstics : 1) I will divide the sampling set in two main groups. The members belonging...

    Started by Manoel Carlos‎, 08-18-2017 11:00 AM
    • Replies: 1
    • Views: 217
    08-18-2017, 11:09 PM Go to last post
  10. When does a sample cease to be random

    I never thought about this before I got it today. We have low response rates, perhaps 20 percent. Is there a point at which very low response rates...

    Started by noetsi‎, 08-01-2017 05:02 PM
    • Replies: 8
    • Views: 637
    08-10-2017, 09:26 AM Go to last post
  11. 20 independent variables, 1 dependent variable.Which variables explain variance best?

    Hello, I have 20 different scales of independent items (psychological variables, Big 5, beliefs, attitudes, cognitive abilities, all metric) ...

    Started by Deus_Ex_Machina‎, 08-01-2017 06:56 PM
    • Replies: 0
    • Views: 127
    08-01-2017, 06:56 PM Go to last post
  12. Pearson's Correlation + CFA?

    Hi guys, I am currently performing a study that aims to determine - 1. If there is a relationship between the AGE of respondents and their...

    Started by n.white1978‎, 07-27-2017 04:15 PM
    • Replies: 0
    • Views: 250
    07-27-2017, 04:15 PM Go to last post
  13. weighted average question

    This is a really simple question, but I am sick today and having a hard time concentrating. For the course of the year we have a number of...

    Started by noetsi‎, 07-24-2017 02:53 PM
    • Replies: 4
    • Views: 332
    07-24-2017, 07:06 PM Go to last post
  14. Messy methodology design

    Hello everybody, Let's see if I can sum up the problems I'm facing in a study I am working in since I'm quite new to statistics and thigs are...

    Started by AJLRB‎, 07-17-2017 01:47 AM
    • Replies: 3
    • Views: 387
    07-17-2017, 03:22 PM Go to last post
  15. Smile Description of continuous measurement

    In the pdf attachment from a set of notes, a brief description of how we describe a continuous measurement is described. I have a few basic questions...

    Started by Jickro‎, 07-13-2017 10:27 AM
    • Replies: 0
    • Views: 286
    07-13-2017, 10:27 AM Go to last post
  16. 2 Way ANOVA or multiple t tests with correction?

    Hi all, I am trying to do some data analysis, and I'm not sure whether to use a 2 way ANOVA or multiple t tests with Bonferroni correction. I...

    Started by jfar18‎, 07-10-2017 05:37 PM
    experiment analysis, factorial anova, multiple comparisons, t test, two factor anova
    • Replies: 4
    • Views: 584
    07-12-2017, 02:24 PM Go to last post
  17. Question Effectiveness of Tutoring Program on Student Graduation?

    Hi all, I'm hoping that someone can help me verify my planned approach to analyze the effectiveness of a new tutoring program on student...

    Started by irguy‎, 06-28-2017 11:46 AM
    • Replies: 2
    • Views: 450
    07-06-2017, 02:22 PM Go to last post
  18. multi-level analysis

    In order to analyze my multilevel data by means of multi-level analysis, I would like to match person-level data (Level 2) of my sample (collected...

    Started by kukuk‎, 06-29-2017 03:09 PM
    multi-level analysis
    • Replies: 0
    • Views: 303
    06-29-2017, 03:09 PM Go to last post
  19. Transporting LASSO Model Results to Logistic Reg for Estimates

    I have a dataset which will be entirely made up of binary variables (i.e., ~25 IVs, 1 DV). Variables will likely be correlated. N=~300. -I was...

    Started by hlsmith‎, 06-15-2017 12:30 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 844
    06-28-2017, 02:31 PM Go to last post
  20. Test vs gold standard clumsy doubt

    Hello everybody, I want to know if a test I'm working in has a good sensitivity and specificity (compared with a gold standard test), but I am not...

    Started by AJLRB‎, 06-26-2017 02:14 AM
    • Replies: 5
    • Views: 357
    06-27-2017, 08:04 AM Go to last post
  21. Guidance for using propensity score matching in R

    I am new to programming as well as econometrics and would like to ask some guidance for learning. I am planning to calculate the effectiveness of...

    Started by bagocs‎, 06-18-2017 05:34 AM
    econometrics, matching, r programme, stata
    • Replies: 1
    • Views: 461
    06-26-2017, 12:25 PM Go to last post
  22. Find standard deviation of costs from different sources

    Hi everyone, I am trying to find the standard deviation of the cost of a certain health treatment. The cost consists of: Out of pocket costs,...

    Started by statpat‎, 06-21-2017 12:37 AM
    • Replies: 1
    • Views: 318
    06-21-2017, 02:23 AM Go to last post
  23. How long is data still useful for

    I commonly read studies based on federal data sets that might be 30 plus years old. Something I had not thought of is, are the results in the study...

    Started by noetsi‎, 06-05-2017 03:30 PM
    • Replies: 8
    • Views: 977
    06-07-2017, 04:26 PM Go to last post
  24. What is unbalanced data

    As in this example.

    Started by noetsi‎, 06-05-2017 10:02 AM
    • Replies: 4
    • Views: 570
    06-05-2017, 01:05 PM Go to last post
  25. 2-way4X3 Factorial ANOVA--does this require repeated measures for correlated errors ?

    I am comparing different methods of estimating water use from irrigated land. I have 2 factors: Irrigation Type (a,b,c,d--these are irrigation...

    Started by hydrogeologist1‎, 06-05-2017 12:22 PM
    anova, correlated errors
    • Replies: 0
    • Views: 235
    06-05-2017, 12:22 PM Go to last post
  26. descriptive statistics

    the means of two samples of size 50 and 100 respectively are 45.1 and 50.3 and the standard deviations are 8 and 7. obtained the mean and standard...

    Started by osamastat‎, 06-01-2017 11:27 AM
    • Replies: 1
    • Views: 439
    06-01-2017, 11:47 AM Go to last post
  27. 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: 584
    05-27-2017, 02:21 AM Go to last post
  28. 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: 794
    05-26-2017, 10:15 PM Go to last post
  29. 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: 574
    05-25-2017, 01:26 PM Go to last post
  30. 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: 696
    05-22-2017, 04:21 PM Go to last post
  31. 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: 578
    05-22-2017, 07:20 AM Go to last post
  32. 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: 861
    05-16-2017, 11:50 AM Go to last post
  33. 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: 1,267
    05-11-2017, 02:08 PM Go to last post
  34. 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: 579
    05-07-2017, 03:59 PM Go to last post
  35. 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: 879
    05-03-2017, 08:31 AM Go to last post
  36. 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: 514
    05-02-2017, 05:17 PM Go to last post
  37. 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: 710
    05-01-2017, 11:03 AM Go to last post
  38. 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: 780
    04-25-2017, 06:57 AM Go to last post
  39. 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: 712
    04-23-2017, 11:24 AM Go to last post
  40. 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: 653
    04-20-2017, 05:46 PM Go to last post
  41. 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: 569
    04-17-2017, 05:51 PM Go to last post
  42. 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: 704
    04-12-2017, 10:45 PM Go to last post
  43. 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: 636
    04-10-2017, 10:03 AM Go to last post
  44. 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: 723
    04-10-2017, 06:48 AM Go to last post
  45. 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: 838
    04-03-2017, 10:28 AM Go to last post
  46. 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: 633
    04-03-2017, 04:07 AM Go to last post
  47. 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: 571
    04-03-2017, 03:01 AM Go to last post
  48. 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: 887
    04-01-2017, 11:54 PM Go to last post
  49. 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: 8,950
    04-01-2017, 11:50 PM Go to last post
  50. 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: 869
    04-01-2017, 11:38 PM Go to last post
  51. 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: 2,255
    03-27-2017, 11:27 AM Go to last post
  52. 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: 2,658
    03-26-2017, 11:32 AM Go to last post
  53. 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: 1,700
    03-22-2017, 06:09 PM Go to last post
  54. 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: 1,278
    03-22-2017, 02:11 PM Go to last post
  55. 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: 1,023
    03-20-2017, 05:51 AM Go to last post
  56. 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: 2,146
    03-18-2017, 03:50 AM Go to last post
  57. 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: 921
    03-17-2017, 05:03 PM Go to last post
  58. 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: 1,071
    03-11-2017, 06:00 AM Go to last post
  59. 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: 1,251
    03-08-2017, 11:06 AM Go to last post
  60. 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: 2,818
    03-07-2017, 10:42 AM Go to last post

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