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# Forum: Applied Statistics

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

1. ### Stationarity tests and cointegration question

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• Replies: 0
• Views: 1,357
02-15-2013, 09:01 PM
2. ### Pareto charts

Hello small question... why does Pareto charts called Pareto charts ? Is it because Pareto invented them, or is it because the line over the...

• Replies: 1
• Views: 2,071
02-12-2013, 09:55 AM
3. ### Relative risk from sensitivity

Hi all, I am working on homework from my categorical responses stats class and stumped on the last question. "A diagnostic test has...

• Replies: 0
• Views: 3,790
02-11-2013, 05:40 PM
4. ### event time span analysis

Hi, I want to make an analysis which exhibit user events in the game according to his cumulative play time The problem, every user has different...

• Replies: 0
• Views: 1,876
02-09-2013, 09:15 AM
5. ### data points and correlation result

Hi Guys First I hope that my question is in the right place and that it's been a while since i've been doing stats. Recently I've found the...

• Replies: 5
• Views: 1,758
02-08-2013, 03:23 PM
6. ### F Dist Value for Relative Risk CI with McNemar data

Quick question. I am using exact McNemar test with paired data (via SAS). I want to calculate relative risk (RR) with exact confidence intervals...

• Replies: 8
• Views: 2,300
02-06-2013, 02:44 PM
7. ### Suggestions to improve this sports model?

Based on the second table "January window spend by place..." in this article, I came up with an LM attempting to determine if, in the English soccer...

• Replies: 2
• Views: 1,742
02-05-2013, 04:40 PM
8. ### deal with unreliable data points

This is a Search Engine Marketing question. Suppose I bid 100K keywords in Google. 70K of them have no conversion and many of these 70K have a very...

• Replies: 1
• Views: 2,043
02-05-2013, 09:51 AM
9. ### time series question

1. Xt = Xt-1 – Xt-2 + et 2. Yt = 0.6Yt-5 + et. how to find the E(Xt) and E(Yt)

• Replies: 1
• Views: 1,732
02-02-2013, 01:17 AM
10. ### stock market probability

suppose i have the following probabilities of making a profitable stock trade: day 1: 2/3 day 2: 2/3 day 3: 2/2 day 4: 3/4 day 5: 0/2 how...

• Replies: 9
• Views: 9,317
01-31-2013, 10:33 AM
11. ### Random numbers from normal distribution with given mean, st dev, Min, and Max

Hi All !!! I would appreciate to have hints of the following issue. I was wondering how to get random values from a normal distribution with a...

• Replies: 5
• Views: 9,111
01-30-2013, 11:09 AM
12. ### Game industry interview + analysis

Hello there, Some days ago I applied for a job in a famous company; after passed the first two selections they asked me to go at their offices for...

• Replies: 12
• Views: 3,569
01-29-2013, 12:55 PM
13. ### Seeking help to identify the proper method to explain... correlation??

Hi there, I am revisiting statistical methods in my professional life, about a decade after studying the topic. I have a large dataset in excel,...

• Replies: 3
• Views: 1,894
01-28-2013, 05:30 PM
14. ### variation for treatment effect in meta-analysis

Hello, I am conducting a meta-analysis towards the effect of protein supplementation on walking speed. The studies included in the analysis...

• Replies: 0
• Views: 1,915
01-27-2013, 10:29 AM
15. ### Adjusted Anderson-Darling

Hi For my class students I wrote a few years ago the detailed proof of AD basic statistics test. Since a few months I try for my classroom...

• Replies: 0
• Views: 1,922
01-26-2013, 08:04 AM
16. ### what does it means by no significance autocorrelation coefficient

in reading time series book, then found this statement "If the residuals are white noise, then it is expected that no significant autocorrelation...

• Replies: 3
• Views: 3,361
01-22-2013, 02:57 PM
17. ### Mechanical Engineer, four cavity mold, how many parts to test?

My friend is a mechanical engineer at a company in CT. I was pretty good at stats back in my day so he asked me to solve this for him. This is a REAL...

• Replies: 1
• Views: 1,531
01-22-2013, 02:24 AM
18. ### Randomized test?

I have 7 scores that are split into groups of 4 and 3. This produces 35 unique combinations of the scores. I need to find the difference in means of...

• Replies: 2
• Views: 1,659
01-19-2013, 09:31 PM
19. ### Survey Data for performance metrics

Dear Stats Forum, I have a question about how to use subjective survey data in the development of design and performance targets for a product. ...

• Replies: 0
• Views: 1,541
01-18-2013, 01:07 PM
20. ### Suggest analysis?

I am an experience programmer and mathematician, but only have basic statistics, probability, and regression coursework. I use both R and SAS daily...

• Replies: 1
• Views: 1,831
01-17-2013, 12:24 PM
21. ### Need your help on my "model". Look look look!

Brief introduction: I work at Loyds Industri AS, and come fresh out of school. Loyds have over the past three years spent around \$4M on developing a...

• Replies: 0
• Views: 1,887
01-16-2013, 11:17 AM
22. ### Insurance Data Request

Good day Forum, Currently I've been experimenting with statistical techniques on seismological data - which can be readily obtained, but now I...

• Replies: 2
• Views: 2,048
01-11-2013, 08:21 AM
23. ### Calculating variance when proportions are not of population

I've been racking my brains on this and can't find a solution that gives me that warm fuzzy feeling inside and I was hoping that somebody here could...

• Replies: 6
• Views: 6,245
01-09-2013, 01:17 PM
24. ### Bunck of binary variables - which model to use

Hi, I'm struggling a bit regarding which model to use. I got a bunch of yes/no answers to price questions. Like the following example: ...

• Replies: 1
• Views: 1,540
01-09-2013, 01:12 PM
25. ### Measuring variability - Research experiment

Hi guys I'm looking at the variability of temperatures that can stimulate pain in different subjects and whether this variability decreases at...

• Replies: 1
• Views: 1,384
01-06-2013, 10:46 AM
26. ### why we need new lifetime model?

Hello everybody! as you see the title, I want to know that why we need new lifetime mode like exponential, weibull and other model which related...

• Replies: 7
• Views: 1,750
01-04-2013, 01:07 PM
27. ### help me about ARMA model

Hi guys ! This is my first post and i have a sort of a dumb question : Do the time serie need to be stationary in order to model it to ARMA ?? ...

• Replies: 3
• Views: 1,773
01-01-2013, 10:50 AM
28. ### data normalization

Hi I want to ask that if i normalize the data and then use it into my calculation. To what percent it can introduce error into my calculation ...

• Replies: 1
• Views: 1,786
12-31-2012, 11:13 AM
29. ### Panel Cointegrated data analysis

Carrying out Panel data analysis requires what and what steps in STATA

• Replies: 0
• Views: 1,794
12-31-2012, 09:13 AM
30. ### Test for Rarely Occurring Serial Correlation

Hi This is a problem in industrial statistics. We have an instrument which is examined about every 6 weeks by testing colour standards. Some...

• Replies: 1
• Views: 1,374
12-28-2012, 09:01 AM
31. ### Out-of-sample likelihood as a forecast accuracy metric

In ageconsearch.umn.edu/bitstream/18947/1/cp01no01.pdf the authors claim that in order to compare the forecasting performance of two non-nested...

• Replies: 0
• Views: 1,885
12-26-2012, 03:17 PM
32. ### Filtering sample data -- catastrophic failure?

Is it legitimate to filter results AFTER a test, but BEFORE calculating statistics? Here are two examples, each using a sample size of 100: 1. ...

• Replies: 0
• Views: 1,882
12-18-2012, 05:25 AM
33. ### how to determine if size and frequency of an event increase or decrease over time?

Hello, I have a data set of events, each described by a time and a value. I want to examine if a) frequency of events increases or decreases over...

• Replies: 2
• Views: 1,805
12-15-2012, 10:49 PM
34. ### Multivariate Analysis of Rare Events

Hello all, I have an interesting problem that I'm trying to find a correct or appropriate direction to work on. I will summarize things to the best...

• Replies: 0
• Views: 1,565
12-12-2012, 01:45 PM
35. ### Collecting partial data hierarchical model with 100+ indicators

Hi, I am looking to conduct a survey accross multiple firms. however, what I want to measure comes down to more than 100 indicators. Obviously...

• Replies: 3
• Views: 1,353
12-12-2012, 09:01 AM
36. ### How to compare GARCH models?

I have estimated various GARCH models and now I want to find the model that fits the data most accurately. Can I just compare the log-likelihood...

• Replies: 1
• Views: 1,447
12-11-2012, 03:28 AM
37. ### Time series (stocks) synchronization/ comparably!

Hi guys can anybody help me please, I want to do a linear regression, but the 2 time-series (stock price) have different lengths. In short how...

• Replies: 2
• Views: 1,963
12-11-2012, 03:20 AM
38. ### overal test differ from lsmeans/pdiff results

Hi all, I run proc mixed and I am not sure how to explain the following results... I am interested in starch content in 3 parts of the same...

• Replies: 3
• Views: 2,294
12-10-2012, 04:05 PM
39. ### MAP estimator (Bayesian statistics)

hello. i am having a little bit of trouble wrapping my head around maximum a posteriori (MAP) estimators in bayesian statistics. i understand that...

• Replies: 7
• Views: 1,772
12-08-2012, 05:37 PM
40. ### Case studies for a design database?

Hi all, I am working on developing an online searchable database of research designs, and at the moment I am writing a grant to support this (in...

• Replies: 1
• Views: 1,191
12-07-2012, 01:09 PM
41. ### If I have a special indicator, is it necessary to decompose a time series?

Hello guys, I'm quite confused now and can't seem to solve my problem concearning time series analysis, I hope some of you might be able to help...

• Replies: 0
• Views: 991
12-07-2012, 11:56 AM
42. ### Optimal Ratio of Case to Controls

I have been asked by a reviewer to support my selection of cases to controls, so I am on the hunt for cite-able references on optimal ratio of cases...

• Replies: 3
• Views: 2,302
12-04-2012, 04:17 PM
43. ### Exogenous Regime Switching Models

Hi, I'm new to the site, so bear with me! I currently have a model that measures inflation expectations as follows: y(t) = a*x(t) +...

• Replies: 0
• Views: 1,505
12-03-2012, 04:48 PM
44. ### When is a mode too freequent to be true?

Hi, I'm a non-specialist looking for some help with one practical problem. I hope I'm on the right forum for that (and if not - I'll appreciate...

• Replies: 11
• Views: 1,680
11-26-2012, 07:53 AM
45. ### plotting high dimensional matrix

Hi All, I have a large 2D matrix (ie 10K x 10K ) that defines the similarity between members of a group. ie A B C D A 5 2 ...

• Replies: 7
• Views: 1,913
11-15-2012, 11:43 PM
46. ### Book on computational data analytics and applications of data analytics

hi, I'm looking for good books or papers or articles for understanding : 1. Computational Techniques for Large-Scale Data Analysis this covers...

• Replies: 0
• Views: 1,639
11-09-2012, 08:55 PM
47. ### Newey West and Prediction Interval

I have a data set of 76 pairs. Y is highly dependent on X but the residuals are serially correlated. Using linear regression, I wish to predict Y...

• Replies: 0
• Views: 1,806
11-09-2012, 03:27 PM
48. ### Choosing a subset of data to represent the total data distribution from given subsets

Unposted - Unposted

• Replies: 0
• Views: 1,892
11-09-2012, 11:12 AM
49. ### How to choose a target variable ?

Hello all, I have this problem, I have an array of 30 sensors, each gives a response when being sampled. I want to know if the sensors can...

• Replies: 0
• Views: 1,442
11-08-2012, 03:07 AM
50. ### Independent and Serial Correlation

I have a set of 76 annual occurrences of x and y. When I run a linear regression, y is significantly correlated to x. The Durbin-Watson test shows...

• Replies: 6
• Views: 4,157
11-07-2012, 09:56 AM
51. ### Comparison of means (1 continuous DV and 1 categorical IV)

I have 1 continuous dependent variable, nitrate, and 1 categorical independent variable, geology (12 categories). I want to compare the mean nitrate...

• Replies: 2
• Views: 2,754
10-31-2012, 04:13 AM
52. ### Probit model -how to use

I am trying to understand how to interpret the result of Zmijewski bankruptcy prediction model based on probit model. Wanda A. Wallace wrote in this...

• Replies: 0
• Views: 2,551
10-28-2012, 10:11 AM
53. ### calculation of the correlation between an index and the etf

hi, I want to calculate the correlation between an index and an etf, but there is a mistace in my code and I don't know how remedy the defect. ...

• Replies: 0
• Views: 2,537
B_P
10-26-2012, 05:39 AM
54. ### Calculating Value-at-Risk using SARIMA-GARCH

I try to estimate the Value-at-Risk for various times in the future. My time series shows seasonality, therefore I think that a SARIMA-model would be...

• Replies: 0
• Views: 2,074
10-25-2012, 03:20 AM
55. ### No ARCH test

If you are going to test for no arch effects up to 2 lags, say, for a sample of T=3572 residuals, e, is the approach then the following: Calculate...

• Replies: 0
• Views: 1,505
10-24-2012, 05:42 PM
56. ### different fiscal year end and fama macbeth regress

dear all, can i apply fama macbeth regression for a short time period 3-4 years? plus if the sample firms consist of firms with fiscal year end at...

• Replies: 0
• Views: 2,034
10-24-2012, 05:34 PM
57. ### Root Mean Squared Error/Deviation in Simulation Studies....

hello members! :wave: i am having a little bit of trouble understanind what the Root Mean Squared Error (RMSE) or Root Mean Squared Error...

• Replies: 0
• Views: 4,600
10-22-2012, 12:15 PM

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