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Forum: Applied Statistics

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

  1. Question Don't know how to statistically justify sample size

    I'm a newby to the forum, thanks in advance for your help. I'm planning to test some parts but because of all the replicates I can only afford to...

    Started by kevstrerini‎, Yesterday 01:22 PM
    pop sigma unknown, sample size, sd unknown
    • Replies: 1
    • Views: 60
    Yesterday, 06:10 PM Go to last post
  2. Definitive Screening Problem

    Background: I'm studying a complicated welding process where I have 12 continuous factors and 1 categorical factor that interact to produce a dense...

    Started by Ygaber‎, 11-18-2017 01:26 PM
    • Replies: 0
    • Views: 67
    11-18-2017, 01:26 PM Go to last post
  3. Lightbulb Null Hypothesis - Alternative Hypothesis - T-test

    Dear Stats-friends! I have an issue with formulating the null hypothesis, the alternative hypothesis, and performing the appropriate t-test...

    Started by Sttepanka‎, 11-15-2017 06:11 PM
    • Replies: 0
    • Views: 132
    11-15-2017, 06:11 PM Go to last post
  4. Test if statistically significant differences between the means of groups exist

    Hello! Currently, I'm writing my thesis and have some problems. I did a survey with a choice experiment and several statements, like e.g. I enjoy...

    Started by luna06‎, 11-13-2017 12:14 PM
    • Replies: 1
    • Views: 128
    11-13-2017, 02:39 PM Go to last post
  5. Question Normal distribution of sample or population?

    Hello, for using parametric tests, is it required that the sample data are normally distributed or is it sufficient to know from other similar...

    Started by Biochemist‎, 11-09-2017 01:03 PM
    • Replies: 14
    • Views: 371
    11-11-2017, 09:44 AM Go to last post
  6. Event study - varying sample size per event window allowed?

    Hi all, I am conducting an event study, analyzing how social media posts are affecting stock prices. Is it statistically allowed to have a...

    Started by Eventstudy17‎, 11-10-2017 02:26 PM
    event study, sample size, significance test
    • Replies: 2
    • Views: 154
    11-11-2017, 07:23 AM Go to last post
  7. Three people checking

    This is my first post so please forgive me if I have posted this in the wrong forum or if this is simple and has already been answered somewhere...

    Started by alsdhf‎, 11-07-2017 07:48 AM
    • Replies: 0
    • Views: 118
    11-07-2017, 07:48 AM Go to last post
  8. comment on research design.

    I have been asked to create a research design. The goal is to evaluate a new way of serving customers, an intervention to do so, with a series of...

    Started by noetsi‎, 10-31-2017 05:34 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 359
    11-04-2017, 11:26 PM Go to last post
  9. Merge two EOFs (principal components)

    Hi, I'm doing an EOF analysis to my data, and I make a decision on how many EOFs to retain. I also used the North's rule of thumb (North et al....

    Started by emilioe‎, 11-01-2017 11:33 PM
    • Replies: 0
    • Views: 178
    11-01-2017, 11:33 PM Go to last post
  10. Post ANOVA-customer satisfaction witb e-services provided by bank depend repondent's age

    Hi, I was testing the hypothesis that the satisfaction level of the respondent with respect to e-banking services provided by their bank depends upon...

    Started by ashraf_zaidi‎, 11-01-2017 08:32 AM
    • Replies: 0
    • Views: 128
    11-01-2017, 08:32 AM Go to last post
  11. Variable importance in random forest

    Hi, In order to predict a binary target variable, I trained a random forest with 84 explanatory variables (using 10 variables randomly selected in...

    Started by MarcoVA‎, 10-21-2017 04:31 PM
    important predictors, performance, random forest, test data, variable selection
    • Replies: 6
    • Views: 403
    10-22-2017, 04:48 PM Go to last post
  12. Is there a Correlation metric for Categorical vs Numerical features?

    I've been searching for some time for a correlation metric analogous to the Pearson correlation value for numerical vs numerical features, or...

    Started by hlopes‎, 10-20-2017 08:30 AM
    categorical, correlation, numerical, pearson
    • Replies: 2
    • Views: 296
    10-22-2017, 04:46 PM Go to last post
  13. What statistical Test should I use? Anova?

    I have to compare the impact of incentives on an App users (If they avoid using cell phone while driving). The variable is discrete (Number of time...

    Started by Msilvy‎, 10-22-2017 02:07 PM
    anova, compare groups, statiscal approach
    • Replies: 0
    • Views: 181
    10-22-2017, 02:07 PM Go to last post
  14. Reporting results p > .05 justified?

    Hi all, Recently I did a field study where I investigated recycling behaviour in the office. We did a baseline and post-intervention measurement...

    Started by DvdR‎, 10-19-2017 05:06 AM
    • Replies: 1
    • Views: 184
    10-19-2017, 08:05 AM Go to last post
  15. Correlation and reproducibility

    Hi, I just registered to find some answers to probably very simple questions.. I hope those are not answered too often in the forum, but my...

    Started by cspr‎, 10-19-2017 06:29 AM
    correlation, independent variable, regression, reproducibility, variance
    • Replies: 0
    • Views: 129
    10-19-2017, 06:29 AM Go to last post
  16. Posterior of a Lognormal Shape Parameter, in Terms of Prior Location & Shape

    I am setting up a Bayesian analysis using a lognormal distribution with skewed data. I want to estimate the "standard deviations" of samples taken...

    Started by NaiveBayesian‎, 09-24-2017 11:07 PM
    bayesian analysis, gamma distribution, lognormal, posterior, standard deviation
    • Replies: 1
    • Views: 503
    09-25-2017, 08:14 PM Go to last post
  17. Lambda Distribution or Generalised Lambda Distribution

    Hello All, I am looking to use a Lambda distribution to model, Normal, Uniform and distributions which are a combination of the two. But I can't...

    Started by GG1234‎, 09-22-2017 06:33 AM
    generalised, gld, lambda
    • Replies: 0
    • Views: 339
    09-22-2017, 06:33 AM Go to last post
  18. 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: 369
    09-17-2017, 07:08 PM Go to last post
  19. Forecasting times eries with different daily length

    Hey everybody! I’ve been tasked by my company to forecast the amount of phone calls on an hourly basis during the company’s opening hours. ...

    Started by Steinberg‎, 09-14-2017 01:48 AM
    forecast, sas, timeseries
    • Replies: 4
    • Views: 426
    09-15-2017, 01:26 AM Go to last post
  20. 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: 429
    09-06-2017, 07:32 PM Go to last post
  21. 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: 5,433
    09-05-2017, 01:11 PM Go to last post
  22. Chow test to compare regression models with different parameters

    Hi, I have some questions about chow test. Let’s 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: 188
    09-04-2017, 11:25 PM Go to last post
  23. 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: 591
    08-29-2017, 01:30 PM Go to last post
  24. 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: 325
    08-25-2017, 01:24 PM Go to last post
  25. 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: 727
    08-19-2017, 11:02 AM Go to last post
  26. Looking for a simple random biased method to order a set

    I am looking for a sampling method with the following característics : 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: 298
    08-18-2017, 11:09 PM Go to last post
  27. 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: 970
    08-10-2017, 09:26 AM Go to last post
  28. 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: 201
    08-01-2017, 06:56 PM Go to last post
  29. 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: 582
    07-27-2017, 04:15 PM Go to last post
  30. 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: 548
    07-24-2017, 07:06 PM Go to last post
  31. 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: 623
    07-17-2017, 03:22 PM Go to last post
  32. 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: 583
    07-13-2017, 10:27 AM Go to last post
  33. 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: 1,377
    07-12-2017, 02:24 PM Go to last post
  34. 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: 746
    07-06-2017, 02:22 PM Go to last post
  35. 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: 499
    06-29-2017, 03:09 PM Go to last post
  36. 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: 1,117
    06-28-2017, 02:31 PM Go to last post
  37. 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: 674
    06-27-2017, 08:04 AM Go to last post
  38. 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: 1,033
    06-26-2017, 12:25 PM Go to last post
  39. 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: 703
    06-21-2017, 02:23 AM Go to last post
  40. 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: 1,710
    06-07-2017, 04:26 PM Go to last post
  41. What is unbalanced data

    As in this example.

    Started by noetsi‎, 06-05-2017 10:02 AM
    • Replies: 4
    • Views: 1,358
    06-05-2017, 01:05 PM Go to last post
  42. 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: 355
    06-05-2017, 12:22 PM Go to last post
  43. 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: 700
    06-01-2017, 11:47 AM Go to last post
  44. Is it appropriate to not compare all samples and rather 2 of them and another 2?

    I’m preparing within a group repeated measures study with duration of 3 weeks. 1st week - no technique is applied, it’s a control group, 2nd week -...

    Started by Alyona‎, 05-27-2017 02:21 AM
    • Replies: 0
    • Views: 882
    05-27-2017, 02:21 AM Go to last post
  45. 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: 1,257
    05-26-2017, 10:15 PM Go to last post
  46. 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: 842
    05-25-2017, 01:26 PM Go to last post
  47. 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: 1,191
    05-22-2017, 04:21 PM Go to last post
  48. 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: 825
    05-22-2017, 07:20 AM Go to last post
  49. 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: 1,321
    05-16-2017, 11:50 AM Go to last post
  50. 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: 2,267
    05-11-2017, 02:08 PM Go to last post
  51. 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: 870
    05-07-2017, 03:59 PM Go to last post
  52. 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: 1,222
    05-03-2017, 08:31 AM Go to last post
  53. 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: 759
    05-02-2017, 05:17 PM Go to last post
  54. 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: 1,012
    05-01-2017, 11:03 AM Go to last post
  55. 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: 1,146
    04-25-2017, 06:57 AM Go to last post
  56. 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: 1,066
    04-23-2017, 11:24 AM Go to last post
  57. 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: 865
    04-20-2017, 05:46 PM Go to last post
  58. 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: 864
    04-17-2017, 05:51 PM Go to last post
  59. 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: 1,024
    04-12-2017, 10:45 PM Go to last post
  60. 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: 901
    04-10-2017, 10:03 AM Go to last post

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