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# Forum: Applied Statistics

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

1. ### 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...

• Replies: 1
• Views: 403
09-25-2017, 08:14 PM
2. ### 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...

• Replies: 0
• Views: 250
09-22-2017, 06:33 AM
3. ### 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...

• Replies: 1
• Views: 258
09-17-2017, 07:08 PM
4. ### 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. ...

• Replies: 4
• Views: 279
09-15-2017, 01:26 AM
5. ### 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...

• Replies: 4
• Views: 296
09-06-2017, 07:32 PM
6. ### 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...

• Replies: 44
• Views: 4,415
09-05-2017, 01:11 PM
7. ### 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...

• Replies: 9
• Views: 429
08-29-2017, 01:30 PM
8. ### 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...

• Replies: 2
• Views: 266
08-25-2017, 01:24 PM
9. ### 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...

• Replies: 1
• Views: 234
08-18-2017, 11:09 PM
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...

• Replies: 8
• Views: 741
08-10-2017, 09:26 AM
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) ...

• Replies: 0
• Views: 159
08-01-2017, 06:56 PM
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...

• Replies: 0
• Views: 365
07-27-2017, 04:15 PM
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...

• Replies: 4
• Views: 409
07-24-2017, 07:06 PM
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...

• Replies: 3
• Views: 462
07-17-2017, 03:22 PM
15. ### 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...

• Replies: 4
• Views: 943
07-12-2017, 02:24 PM
16. ### 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...

• Replies: 0
• Views: 368
06-29-2017, 03:09 PM
17. ### 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...

• Replies: 17
• Views: 943
06-28-2017, 02:31 PM
18. ### 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...

• Replies: 5
• Views: 462
06-27-2017, 08:04 AM
19. ### 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...

• Replies: 1
• Views: 662
06-26-2017, 12:25 PM
20. ### 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,...

• Replies: 1
• Views: 460
06-21-2017, 02:23 AM
21. ### 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...

• Replies: 8
• Views: 1,291
06-07-2017, 04:26 PM
22. ### What is unbalanced data

As in this example.

• Replies: 4
• Views: 803
06-05-2017, 01:05 PM
23. ### 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...

• Replies: 0
• Views: 283
06-05-2017, 12:22 PM
24. ### 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...

• Replies: 1
• Views: 525
06-01-2017, 11:47 AM
25. ### 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 -...

• Replies: 0
• Views: 693
05-27-2017, 02:21 AM
26. ### 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...

• Replies: 3
• Views: 942
05-26-2017, 10:15 PM
27. ### 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...

• Replies: 3
• Views: 642
05-25-2017, 01:26 PM
28. ### 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)...

• Replies: 0
• Views: 852
05-22-2017, 04:21 PM

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...

• Replies: 1
• Views: 670
05-22-2017, 07:20 AM
30. ### 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...

• Replies: 0
• Views: 1,118
05-16-2017, 11:50 AM
31. ### 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)....

• Replies: 6
• Views: 1,665
05-11-2017, 02:08 PM
32. ### 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...

• Replies: 0
• Views: 705
05-07-2017, 03:59 PM
33. ### 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...

• Replies: 3
• Views: 998
05-03-2017, 08:31 AM
34. ### 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...

• Replies: 0
• Views: 603
05-02-2017, 05:17 PM
35. ### 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...

• Replies: 0
• Views: 913
04-25-2017, 06:57 AM
36. ### 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...

• Replies: 0
• Views: 849
04-23-2017, 11:24 AM
37. ### 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...

• Replies: 0
• Views: 744
04-20-2017, 05:46 PM
38. ### 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,...

• Replies: 0
• Views: 677
04-17-2017, 05:51 PM
39. ### 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...

• Replies: 0
• Views: 824
04-12-2017, 10:45 PM
40. ### 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...

• Replies: 1
• Views: 737
04-10-2017, 10:03 AM
41. ### 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...

• Replies: 4
• Views: 799
04-10-2017, 06:48 AM
42. ### 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...

• Replies: 3
• Views: 938
04-03-2017, 10:28 AM
43. ### 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 =...

• Replies: 0
• Views: 738
04-03-2017, 04:07 AM

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...

• Replies: 2
• Views: 1,043
04-01-2017, 11:54 PM
45. ### 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...

• Replies: 43
• Views: 10,278
04-01-2017, 11:50 PM
46. ### 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...

• Replies: 1
• Views: 1,050
04-01-2017, 11:38 PM
47. ### log(0) should have a real value!!!

Dear all, I’ve 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...

• Replies: 4
• Views: 2,952
03-27-2017, 11:27 AM
48. ### 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....

• Replies: 11
• Views: 3,173
03-26-2017, 11:32 AM
49. ### 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)...

• Replies: 10
• Views: 1,957
03-22-2017, 06:09 PM
50. ### 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...

• Replies: 10
• Views: 1,438
03-22-2017, 02:11 PM
51. ### 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....

• Replies: 0
• Views: 1,289
03-20-2017, 05:51 AM
52. ### 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...

• Replies: 5
• Views: 2,690
03-18-2017, 03:50 AM
53. ### 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...

• Replies: 0
• Views: 1,064
sdj
03-17-2017, 05:03 PM
54. ### 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...

• Replies: 0
• Views: 1,242
03-11-2017, 06:00 AM

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