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# Forum: Applied Statistics

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

1. ### Reasoning behind comparing variance between and within for Anova?

I looking for some logic reasoning behind why ANOVA test uses σ2 given by these to variables. Why??

• Replies: 1
• Views: 1,695
01-03-2015, 12:01 PM
2. ### Calculating End-of-year performance for IRA when base changes during the year.

Hi Everyone, One the surface, this would seem to be an extremely simple calculation... but it has me stumped. To demonstrate, I'll give you two...

• Replies: 0
• Views: 1,710
01-01-2015, 11:49 PM
3. ### Fit statistics - why is this so

I was/am reading an econometric book commenting on R squared specifically, but fit statistics more generally. The author makes the following comment...

• Replies: 2
• Views: 2,372
12-30-2014, 09:08 AM
4. ### Combining performance metrics

Hi All and Merry Christmas to those that are celebrating. I have a querie about how to combine different metrics relating to performace of a...

• Replies: 5
• Views: 4,477
12-28-2014, 04:50 AM
5. ### Football Injury Stats

So I came across this article about English Premier League football clubs and injuries. A data analyst has "clearly demonstrate(d) that Arsenal do...

• Replies: 6
• Views: 2,717
12-26-2014, 04:23 PM
6. ### Missort Letter Sorting Machine (Statistical Approach)

Hi all, I'm doing some test in a LETTER SORTING MACHINE and I have to prove that with the new modifications to the machine we get a MISSORT...

• Replies: 4
• Views: 2,536
ico
12-22-2014, 11:40 AM
7. ### stdev hourly average --> stdev individual measurements

For a process variable that's measured every 2 minutes, there's a requirement that the hourly averages of this variable should lie within a normal...

• Replies: 0
• Views: 1,769
12-19-2014, 09:36 AM
8. ### Interval censored time-to-event datasets?

Hi everyone, I'm looking for this particular structure of data for working on my thesis. In particular, I need interval censored with a cure...

• Replies: 0
• Views: 1,798
12-11-2014, 03:33 PM
9. ### Best Method for Evaluating Inter-Instrument Agreement

I am comparing two populations of color measuring instruments. 40 samples are measured on three instruments from both populations. What is the best...

• Replies: 2
• Views: 1,976
12-11-2014, 10:15 AM
10. ### Two-way ANOVA and subsequent posthoc testing

Hi all, First of all I'm new to this forum so I hope I'm posting in the right section (please forgive me if it's not the case :)). I'm a PhD...

• Replies: 4
• Views: 2,905
12-11-2014, 08:33 AM
11. ### Correct Procedure for analysis of Drivers

Hello, I have some survey data which shows an effort score for interacting with a business. I am working in a programme of work tasked to reduce...

• Replies: 0
• Views: 1,222
12-11-2014, 02:37 AM
12. ### Monte Carlo simulation of Mixed Logit

Hello I have estimated a random coefficient logit with heteroscedasticity modelling respondents choice of mobile phones. The heteroscedasticity...

• Replies: 0
• Views: 1,305
12-10-2014, 11:55 PM
13. ### Calculating sample size required for a certain confidence interval

If I have two different independent variables x1 and x2 for which I have a model that predicts these two quantities have means mu1 and mu2, how can I...

• Replies: 1
• Views: 1,216
12-10-2014, 11:35 AM
14. ### Optimal statistical method to optimize a model based on 35 variables

Good day, I try to build a model behind a dating website which gives an optimal match between two people, based on 35 variables such as: age...

• Replies: 4
• Views: 2,569
12-09-2014, 10:22 AM
15. ### Theoretical Question Operational Data What is Sample and what is population.

Hi all. I'm working on operational data of clinical operations, attendance, performance and employee performance. I'm trying to use...

• Replies: 0
• Views: 1,562
12-08-2014, 04:25 AM
16. ### Analysis for determining change in temperature

Hi, I've got a process where a temperature reaches its final (unknown) value in about 120 min. What statistical analysis should I carry out on my...

• Replies: 6
• Views: 2,262
12-05-2014, 01:36 AM
17. ### Using ANOVA for fingerprint comparison data

Hi, I'm a fingerprint examiner by trade and got an idea after reading some papers on various quantitative methods of determining consensus and...

• Replies: 2
• Views: 2,595
12-04-2014, 04:36 PM
18. ### Coefficient of Variation with Log Transformed Data

I know that when working with log transformed data, coefficient of variation (CV) on original scale is equal to sqrt(exp(sigma^2) - 1), where sigma...

• Replies: 1
• Views: 6,169
12-04-2014, 04:02 PM
19. ### Regress Var1POST controlling for var1PRE- Valid approach?

Hello guys, I have a variable that assesses medication adherence among participants with HIV. This variable has ordinal values (likert scale 1 to...

• Replies: 2
• Views: 1,610
12-03-2014, 11:53 AM
20. ### Arithmetic/Log returns of positive/negative/0 values

I'm trying to work out the correlation between movements in prices of 2 products i'm tracking. I will extend this to around 20 products but just want...

• Replies: 0
• Views: 2,804
11-25-2014, 01:40 PM
21. ### Family wise error regression models

I commonly run multiple regressions from the same data set (which seems to occur elsewhere as well given articles I have seen). Formally I think this...

• Replies: 5
• Views: 1,997
11-24-2014, 05:01 PM
22. ### Clustering in a game simulation

I’m looking at computer-assisted opening leads in the card game of bridge. I think this needs some kind of statistical clustering, and this is what...

• Replies: 0
• Views: 1,150
11-24-2014, 03:20 AM
23. ### test of proportion

Even for me this is a basic question, but I am having a crisis of confidence about my knowledge of stats these days.... I am testing if there is a...

• Replies: 14
• Views: 2,916
11-21-2014, 01:05 PM
24. ### Predicting the near-future values using an unevenly sampled time-series data

Hi there, I need help with predicting the near-future values using an unevenly sampled time-series data. Data is collected as events, and is...

• Replies: 1
• Views: 1,298
11-19-2014, 08:01 AM
25. ### Forecasting with a known limit

Hi all, I've been asked to forecast usage of a system where the quantity of usage per average user gradually increases, and the number of users...

• Replies: 1
• Views: 1,208
11-19-2014, 07:45 AM
26. ### Comparing samples to populatins

This might actually wonder into the theory GretaGarbo loves and I dread... For the past month I have, with great pain, been comparing our...

• Replies: 2
• Views: 1,481
11-18-2014, 05:45 PM
27. ### Customer Segmentation based on Annual Spend for the purpose of B2B Pricing

Hi, I am new to statistics and this forum so please bear with me on this first post. I am grouping my customers into 4 groups based on their...

• Replies: 0
• Views: 1,115
11-18-2014, 09:27 AM
28. ### Queuing problem

Hey guys, I am new here and after solid hours of research on the internet, I hope you can get me started on solving my problem. It is the...

• Replies: 0
• Views: 1,206
11-17-2014, 09:13 PM
29. ### One-sided t-test (ANOVA) - choice of method. Thanks!

Hey everyone, I'm about to do my first statistical study and have a question regarding what method to use. The study is rather simple in...

• Replies: 6
• Views: 1,705
11-17-2014, 04:46 PM
30. ### One sample t test standard error

I am doing a one sample t test to compare a sample proportion to a known population proportion. I have two questions. First, would the standard...

• Replies: 1
• Views: 1,118
11-17-2014, 11:52 AM
31. ### negative chi2 for hausman test on random vs fixed AR(1) model

Dear all, I'm performing a Hausman test on panel data to determine whether to choose Random Effects or Fixed Effects for my analysis with AR(1)....

• Replies: 1
• Views: 4,209
11-17-2014, 03:51 AM
32. ### test to compare an ordinal variable with a nominal variable

In my survey I have an independent variable at nominal level with only two categories: Gender, and a Likert style question with 5 options ranging...

• Replies: 0
• Views: 1,177
11-16-2014, 01:54 PM
33. ### Endowment Insurance with Complete Life Expectancy

Hello! I am new to actuary science and I need help for this question. Any feedback would be appreciated! Question: A five-year endowment...

• Replies: 1
• Views: 1,497
BGM
11-16-2014, 12:08 PM
34. ### Help me with this engineering equation

Hi. I want to write a mathematical equation which compare if the latest notification message (a numerical number) is less than all the previous...

• Replies: 1
• Views: 1,681
11-15-2014, 09:53 PM
35. ### Newbie needs help: my research sample is one end of the bell curve only

Hello forum members I did the wonderful Princeton Statistics 1 Coursera MOOC which I really enjoyed. But I have hit a problem with a project which...

• Replies: 0
• Views: 1,867
11-05-2014, 05:31 AM
36. ### Two-Step Conditional Logit Model In Horse-Racing

I'm reading "Comparing the effectiveness of one- and two-step conditional logit models for predicting outcomes in a speculative market" by Johnson...

• Replies: 3
• Views: 3,108
11-03-2014, 05:25 PM
37. ### Time series outliers

In some forms of time series there are sources who argue that outliers are a major issue and should be adjusted (one suggestion is to move it just...

• Replies: 0
• Views: 1,427
10-28-2014, 12:44 PM
38. ### Exponential smoothing (Holt Winston) books

I do this every couple of months in the hope that someone out there knows a good book on this topic. I have yet to find one (well I found part of one...

• Replies: 4
• Views: 2,135
10-23-2014, 08:38 AM
39. ### removing autocorrelation

Hi everybody, I need help for my thesis please. I have a three variables var, with inflation, unemployment rate and interest rate. I have estimeted...

• Replies: 2
• Views: 4,639
10-23-2014, 08:34 AM
40. ### Dealing with outliers

I understand that many say you should not remove outliers not caused by clerical error. But in many cases they badly distort the data. Methods to...

• Replies: 10
• Views: 2,674
10-22-2014, 08:18 PM
41. ### Retail Sales History

Hi, I was looking at some charts via Wolfram Alpha and noticed a peculiar pattern. Click here Scroll down to see the Retail Sales History...

• Replies: 2
• Views: 1,618
10-22-2014, 08:15 PM
42. ### Sample size determination (margin of error)

Hi all, I notice my organization does not follow to NIST standards and I seek for help from the community: All the while, my company has been...

• Replies: 0
• Views: 1,139
10-19-2014, 10:24 PM
43. ### Can you go from ACS margin of errors to standard deviations?

To skip reading the whole thing, does anyone know how to find the standard deviations (not standard errors which I have already) for the American...

• Replies: 3
• Views: 2,171
10-16-2014, 04:24 PM
44. ### T-Test on on excess returns above an index

I am really struggling with the results of some T-tests which I have been running. I have a few questions which I cannot find answers to on google...

• Replies: 1
• Views: 2,128
10-15-2014, 07:04 AM
45. ### Obtaining standard deviation from margin of error

I need the standard deviation to do a one sample t test. My understanding was that the standard deviation of a sample was equal to the margin of...

• Replies: 2
• Views: 1,614
10-14-2014, 04:01 PM
46. ### test of sample proportion against known population value

We have a known population value of our customers which is a proportion. For example the percent of the population that is white. We have a census...

• Replies: 5
• Views: 3,063
10-14-2014, 12:47 PM
47. ### Linear Programming Help?

Groovy Juice Mixers, Inc. mixes specialty drinks out of grape, guava, and papaya juices. Currently it has 1000, 400, and 300 gallons of each of these...

• Replies: 0
• Views: 3,403
10-13-2014, 09:14 PM
48. ### Incorporating observation weights into logistic regression using clogit package in R

I'm working on running conditional logistic regression on some habitat use data using the package clogit in R. The data is composed of GPS fixes...

• Replies: 0
• Views: 1,489
10-13-2014, 04:52 PM
49. ### MANCOVA and step-down analysis

I have a question concerning the use of step-down analysis after MANCOVA. While I understand the steps for MANOVA, when I started using a covariate...

• Replies: 0
• Views: 3,261
10-13-2014, 03:36 PM
50. ### Similarity coefficient: assessing significance (permutation,bootstrap, neither?)

Hello. In my spare time, I was playing with a similarity measure that finds use in archaeology. It is a coefficient devised in the 1950s, whose name...

• Replies: 4
• Views: 3,325
10-13-2014, 01:35 AM
51. ### Likelihood survey question

There is a survey question which like this: How likely are you to return an item? 0=Not likely at all 1…2…3…4…5…6…7…8…9 10=most likely The...

• Replies: 0
• Views: 3,827
10-12-2014, 04:20 PM
52. ### Prediction of dossier treatment date based on backlog development.

It has been over 30 years since I encountered statistical problems and did any data analysis, so I do not remember anything about regression and...

• Replies: 0
• Views: 1,250
10-11-2014, 05:13 AM
53. ### How to model weighted average ratios in the [0,1] interval

Maarten Buis on this forum provided great insight on how to model percentages in the interval...

• Replies: 0
• Views: 1,545
10-10-2014, 07:36 AM

I am running a GSADF to replicate a paper on grain price exuberance and am having difficulties replicating the results. I can't find too many places...

• Replies: 0
• Views: 3,766
10-08-2014, 10:37 AM
55. ### Weibull Analysis (Weibayes) - No failure

If I have a system (all electronics) which has accumulated test hours and has had no failures, the Weibayes method is recommended. And eta can then...

• Replies: 0
• Views: 3,381
10-08-2014, 10:24 AM

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