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# Forum: Applied Statistics

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

1. ### 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: 121
08-18-2017, 11:09 PM
2. ### 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: 478
08-10-2017, 09:26 AM
3. ### 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: 43
• Views: 2,887
08-01-2017, 08:41 PM
4. ### 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: 94
08-01-2017, 06:56 PM
5. ### 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: 166
07-27-2017, 04:15 PM
6. ### 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: 249
07-24-2017, 07:06 PM
7. ### 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: 307
07-17-2017, 03:22 PM
8. ### 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: 368
07-12-2017, 02:24 PM
9. ### 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: 238
06-29-2017, 03:09 PM
10. ### 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: 719
06-28-2017, 02:31 PM
11. ### 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: 289
06-27-2017, 08:04 AM
12. ### 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: 321
06-26-2017, 12:25 PM
13. ### 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: 223
06-21-2017, 02:23 AM
14. ### 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: 700
06-07-2017, 04:26 PM
15. ### What is unbalanced data

As in this example.

• Replies: 4
• Views: 408
06-05-2017, 01:05 PM
16. ### 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: 186
06-05-2017, 12:22 PM
17. ### 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: 330
06-01-2017, 11:47 AM
18. ### 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: 445
05-27-2017, 02:21 AM
19. ### 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: 575
05-26-2017, 10:15 PM
20. ### 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: 442
05-25-2017, 01:26 PM
21. ### 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: 526
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: 450
05-22-2017, 07:20 AM
23. ### 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: 523
05-16-2017, 11:50 AM
24. ### 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: 915
05-11-2017, 02:08 PM
25. ### 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: 458
05-07-2017, 03:59 PM
26. ### 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: 697
05-03-2017, 08:31 AM
27. ### 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: 395
05-02-2017, 05:17 PM
28. ### 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: 604
04-25-2017, 06:57 AM
29. ### 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: 549
04-23-2017, 11:24 AM
30. ### 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: 511
04-20-2017, 05:46 PM
31. ### 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: 452
04-17-2017, 05:51 PM
32. ### 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: 568
04-12-2017, 10:45 PM
33. ### 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: 502
04-10-2017, 10:03 AM
34. ### 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: 605
04-10-2017, 06:48 AM
35. ### 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: 687
04-03-2017, 10:28 AM
36. ### 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: 462
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: 706
04-01-2017, 11:54 PM
38. ### 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: 7,361
04-01-2017, 11:50 PM
39. ### 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: 649
04-01-2017, 11:38 PM
40. ### 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: 1,548
03-27-2017, 11:27 AM
41. ### 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: 1,967
03-26-2017, 11:32 AM
42. ### 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: 1,329
03-22-2017, 06:09 PM
43. ### 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: 1,027
03-22-2017, 02:11 PM
44. ### 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: 766
03-20-2017, 05:51 AM
45. ### 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: 1,598
03-18-2017, 03:50 AM
46. ### 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: 726
sdj
03-17-2017, 05:03 PM
47. ### 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: 876
03-11-2017, 06:00 AM
48. ### 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...

• Replies: 0
• Views: 1,026
03-08-2017, 11:06 AM
49. ### 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...

• Replies: 1
• Views: 2,187
03-07-2017, 10:42 AM
50. ### 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...

• Replies: 5
• Views: 1,123
03-04-2017, 02:14 PM
51. ### 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...

• Replies: 2
• Views: 1,291
03-02-2017, 01:35 PM
52. ### 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,...

• Replies: 6
• Views: 1,916
03-01-2017, 11:18 AM
53. ### 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.... ...

• Replies: 3
• Views: 1,540
03-01-2017, 09:18 AM
54. ### 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). ...

• Replies: 0
• Views: 2,038
02-26-2017, 10:35 AM

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