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# Forum: Applied Statistics

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

1. ### Confidence Interval for Weighted Average Price Increases : Valid Approach?

My goal is to measure a price increase from month to month at the invoice level and to include a valid confidence interval for each month to month...

• Replies: 3
• Views: 5,768
10-20-2012, 12:57 PM
2. ### test a marketing effect

Suppose a company has retail stores in two regions, A & B and ran a marketing campaign in region B for 3 months. The average monthly store sales...

• Replies: 4
• Views: 2,116
10-19-2012, 02:24 PM
3. ### Testing Difference of Values from Lognormal Distribution?

I have data that fits a lognormal distribution really well. My primary goal is to create a statistical classifier using this distribution to apply to...

• Replies: 1
• Views: 3,730
10-12-2012, 06:41 AM
4. ### Failure Prediction Model - Intersecting Distributions?

Hi all, I'm not a statistician and worried that my question is to sophmoric, so I'm hoping for your patience. I have a use profile for a product...

• Replies: 1
• Views: 1,397
10-12-2012, 06:30 AM
5. ### Combining several estimates to obtain "best guess" with confidence limits

I have a number of estimates for mean wind speed which have been derived from a number of difference sources, each using a different methodology and...

• Replies: 1
• Views: 1,736
10-12-2012, 06:21 AM
6. ### Missing values problem

I trying to set up a count model Poisson for number of births of women. I have a datavariable giving age_of_respondent_at_first_birth. Some women...

• Replies: 4
• Views: 2,197
10-11-2012, 04:43 PM
7. ### Deriving at Normality Assumption

I have taken from this forum that a way to determine normality for a TTest, is that you can take the mean of one group in the strata and subtract it...

• Replies: 3
• Views: 1,881
10-11-2012, 02:31 PM
8. ### Right Anova in SigmaPlot

Hey guys, I got a set of data where 3 substances are tested on 7-9 different animals. And all of this over a time course of 30 - 240 minutes. I...

• Replies: 0
• Views: 2,924
10-11-2012, 11:52 AM
9. ### Combined ANOVA

Hi everybody, My problem is as follows: I designed three plots of 250 m2 On each plots there is three plant species with 3 replicates by...

• Replies: 1
• Views: 3,132
10-11-2012, 02:38 AM
10. ### Sample size for requirement test

Hi all - probably a simple question but I'm not understanding the various articles and such that I've looked up. Here's the problem ... I have to...

• Replies: 2
• Views: 1,379
10-10-2012, 08:31 AM
11. ### Partially linear (semi-parametric) difference in differences models with clustered SE

Hi All, I'm digging through stats literature, and not really finding what I need. I'm looking for a difference in differences estimator that uses...

• Replies: 0
• Views: 1,697
10-03-2012, 05:10 PM
12. ### What is the best way to analyze this data?

I have collected data over three different years (1982, 1992 and 2012) from a professional association. Each of these years had different sample...

• Replies: 5
• Views: 1,699
10-03-2012, 03:53 PM
13. ### ANOVA One-way Vs Factorial ANOVA. Discordant results.

Hi everybody, I have to investigate the influence of many categorical factors (A,B,C) on a continuous response variable (Y). The procedure I'm...

• Replies: 5
• Views: 5,795
10-03-2012, 07:47 AM
14. ### Pearon's chi square // xtpoisson

Hi, I am using Poisson, fixed effects on stata and intend to adjust the standard errors because overdispersion using Pearson chi-square. In stata...

• Replies: 1
• Views: 3,498
09-20-2012, 05:04 AM
15. ### How do I rank variables collected by a Likert scale questionnaire?

I have gathered data from about 70 construction firms who are not currently using a specific software and I asked them why they have not implemented...

• Replies: 2
• Views: 4,517
09-05-2012, 01:27 PM
16. ### solving to zero for multiple scenarios for best result

I have a problem but I'm not sure where to start, here is my scenario: There are 50 diseases out there 100 people have one or more of these...

• Replies: 8
• Views: 1,973
pjc
08-31-2012, 09:13 PM
17. ### Correlation of Leading & Lagging Indicators

Greetings. I am working on a organizational performance dashboard for my company. I have identified lagging and leading indicators in five...

• Replies: 5
• Views: 5,742
08-31-2012, 02:13 PM
18. ### Prediction Accuracy and Sample Asymmetry

Hi everyone, This is my first post to the site. I'm far from an expert when it comes to statistics, but I have a decent ability to apply what I do...

• Replies: 0
• Views: 1,684
08-30-2012, 03:20 AM
19. ### Grouping similar competitors

Suppose we want to look at which airlines have similar pricing strategies. The data set looks like this: Variables: Flight Origination, Flight...

• Replies: 9
• Views: 2,445
08-29-2012, 04:47 PM
20. ### actual prices and two predictions -> ANOVA or MANOVA?

Hello everybody, I'm unsure which stats to use for the following problem: I've got a list of prices for stocks of a certain date. In that list...

• Replies: 4
• Views: 2,506
08-27-2012, 01:58 AM
21. ### Regression analysis help

Hello! I'm sorry I don't know yet how to create a thread for my inquiry. I have a problem with my study, that is, I only have 10 respondent...

• Replies: 4
• Views: 2,791
08-26-2012, 11:56 AM
22. ### composite index with PCA derived weights

composite index with PCA derived weights Seasons greetings ! I was trying to develop a composite index of vulnerability including 38...

• Replies: 2
• Views: 4,893
08-22-2012, 12:58 PM
23. ### Applying standard statistics if samples measurements are grouped?

Hi there, I am facing what it might be a dumb doubt. We are tracking the weight gain of three different groups of pigs that are being fed...

• Replies: 0
• Views: 1,383
08-20-2012, 05:55 PM
24. ### European Central Bank Communications vs. Policy - Ordered Probit

I'm not sure if this is 100% the best forum to post this but I figured I would give it a shot. I'm currently researching the consistency between...

• Replies: 0
• Views: 1,263
08-16-2012, 07:05 AM
25. ### Pointers - Creating a model for predictions

I'm a student doing a project for a retail company that is trying to calculate their lost sales due to malfunctioning products. To do this we've done...

• Replies: 3
• Views: 1,576
08-15-2012, 12:26 PM
26. ### Market Research Stats - Help Needed!

Hi All I was hoping to get some advice on how to apply a particular statistical approach used in Market Research. In my previous role we used a...

• Replies: 0
• Views: 1,723
08-15-2012, 11:41 AM
27. ### Serial Correlation

I have a set of 75 independent and dependent variables. The independent variables are collected each January 1 and the dependent variables represent...

• Replies: 1
• Views: 1,523
08-14-2012, 01:04 PM
28. ### Statistical Protection from a Hacker

Hi everybody! Suppose that a poker player is banned from a poker website due to his/her misbehaviour. This player creates a new account from a new...

• Replies: 4
• Views: 1,938
08-13-2012, 09:41 AM
29. ### Forecasting

Background: I have been given a yearly forecast for a product. I have also looked up actual sales for this product for the first half of the year....

• Replies: 0
• Views: 1,321
08-10-2012, 10:57 AM
30. ### GPA's data base

hello all I have a database consists of 251 variables which represent the courses of science faculty of Benghazi university, the cases represent the...

• Replies: 0
• Views: 1,970
08-09-2012, 09:33 PM
31. ### PUMA and FIPS

I have two datasets, one with census PUMA ids and another with FIPS code. Can anyone explain how to convert one id to the other so I can merge the...

• Replies: 1
• Views: 4,512
08-09-2012, 07:51 PM

I am working on a paper and I am stumped by this question, "Critically analyze the uses and abuses of Statistics as applied to human services...

• Replies: 1
• Views: 1,461
08-09-2012, 01:52 PM
33. ### Covariance matrix singularity

Hello, Could anyone explain, why the matrix of covariance becomes singular when the the number of parameters P is less then the number of samples...

• Replies: 2
• Views: 2,373
08-09-2012, 07:46 AM
34. ### Analyzing multiyear data

Hi all, I have a question regarding the use of correct outcome measure when we utilize multiyear data. Suppose I am assessing 'hospital use by...

• Replies: 1
• Views: 2,119
08-07-2012, 02:47 PM
35. ### Fantasy Football: determining scarcity

I know that there are other fantasy football questions on the forum, and I have read them. Mine is a little bit different. I am looking for an...

• Replies: 5
• Views: 4,437
08-01-2012, 09:50 PM
36. ### Anderson-Darling Goodness of Fit test

Hi there I would like to know if anyone has a PDF copy of the Table of Anderson-Darling critical values at the 5% significance level for a Weibull...

• Replies: 0
• Views: 1,861
08-01-2012, 09:29 AM
37. ### Potato Breeding Strategy

Hi everyone, I wonder if any of you could provide a statistical argument for the best strategy to follow in my potato breeding. Vaguely, the...

• Replies: 1
• Views: 1,845
07-31-2012, 02:19 AM
38. ### Tukey Boxplot

I am calculating outliers for a data set using the Tukey Boxplot. The "problem" is that I have only 25-30 organizations (cases) in the analysis. I am...

• Replies: 1
• Views: 1,275
07-30-2012, 11:41 AM

Dear TalkStats user, I am testing a trading strategy that I built using Matlab. I tested the strategy on the AEX (Dutch Stock Exchange) from 2000...

• Replies: 0
• Views: 2,785
07-22-2012, 01:07 PM
40. ### Influence of time series on time series.

I am trying to determine if changes over time in unemployment and the severity of injury influences change in placement of workers (and which is...

• Replies: 0
• Views: 2,080
07-20-2012, 02:54 PM
41. ### Beneficial betting strategy?

What is a good betting strategy? The strategies I've examined are: Kelly; Kelly0.5; Kelly 0.25; constant betting; constant betting proportional to...

• Replies: 0
• Views: 4,558
07-19-2012, 12:06 PM
42. ### statistical test

Hi everybody, i'm new here and i don't have much experience with statistics. I have an experiment and i've changed a parameter (N), than I've got...

• Replies: 0
• Views: 1,779
gui
07-18-2012, 11:35 PM
43. ### VAR model:changing the vector with the constants

Hello, My name is Simon and currently I'm workin on a Vector Autoregressive model to simulate interest rates. The inputs are the parameters...

• Replies: 0
• Views: 1,853
07-18-2012, 09:40 AM
44. ### One observation - 2 normal distributions

I've got an observation (1 person, name and a small geographical area) with an unknown age that is normally distributed as a function of both name...

• Replies: 1
• Views: 1,455
07-18-2012, 08:42 AM
45. ### what kind of analysis to use? regression, MANOVA, panel data analysis???

Hi, Im an undergrad student doing some research on the effects of financial crisis of 2007 2008 on firms. I have data from 2005 to 2010 for over...

• Replies: 2
• Views: 2,101
07-16-2012, 05:36 PM
46. ### Random Walk

Hi guys, I am working on the following problem related to random walks. I have a set of data as a simple random walk starting at t=0, after...

• Replies: 3
• Views: 2,046
07-16-2012, 04:22 PM
47. ### Correcting a prediction.

At work, I've produced a curve that will predict my net loss on a portfolio of accounts over 50 months. However the curve is not very sophisticated,...

• Replies: 0
• Views: 2,098
07-03-2012, 08:38 AM
48. ### Finding important correlations

I have a question that relates to a project I've been assigned at work. I am supposed to analyze accounts that we have had in the past to determine...

• Replies: 1
• Views: 1,692
07-03-2012, 08:14 AM
49. ### STD DEV Question

I hope this is the right place to post this and my apologies if I make no sense and/or this is such an easy question I have 3 Mutual Funds that I...

• Replies: 0
• Views: 1,407
07-02-2012, 04:49 PM
50. ### After the results of Co-integration test

Hi everyone I am facing the following problem. If any one know, please help me. I have 12 variables in one equation. Three are stationary at...

• Replies: 0
• Views: 1,613
06-25-2012, 09:13 AM
51. ### Varied examples of analysis reports?

Can anyone here please give URLs of websites with good examples of various data analysis reports? I'm often asked to do unique analysis projects,...

• Replies: 0
• Views: 2,181
06-17-2012, 10:48 AM
52. ### Dependence between 2 distributions

Hi all. Is there any way to test for dependence for 2 distributions. Also, can you recommend a good graphical aid to communicate the dependence...

• Replies: 0
• Views: 1,483
06-16-2012, 06:30 PM
53. ### Combine Results from a number of sampled datasets

I am a computer science PhD student. I believe the question I am posing should be trivial to the stats students so bear with me I have a data set...

• Replies: 4
• Views: 1,967
06-14-2012, 10:03 PM
54. ### What significance test should I use?

Hi, I am at a bit off a loss with a project I am working on as my statistics are a very rusty! I've had a look through a few old...

• Replies: 0
• Views: 1,633
06-13-2012, 04:42 PM
55. ### VAR model

Hi , i need a help :) i conducted a VAR model using e-view program after choosing the suitable lag length i re estimate the VAR ,so i got ...

• Replies: 13
• Views: 3,481
06-13-2012, 02:28 PM
56. ### Compute score from variance or correlation coefficient?

Greetings, I’m seeking inspiration in creating a scoring (figure of merit) function that can evaluate how close a set of parallel measurements are...

• Replies: 1
• Views: 3,123
06-12-2012, 09:42 PM
57. ### Significance testing between ratios

Hi, I'm working with employment data to compare my local region with Pennsylvania's employment as a whole. I'd like to determine whether...

• Replies: 3
• Views: 6,662
06-12-2012, 07:54 AM
58. ### Emergency - A quantitative criterion for judging the degree of spectral fragmentation

Greeting, My name is Pooria, an Optical Telecommunications student. I have been working on Flexible Bandwidth Optical Networks since 2009....

• Replies: 0
• Views: 1,425
06-11-2012, 09:10 AM
59. ### Determining the winner between two pricing strategies

I'd like to conduct an A/B split test of pricing strategies on two web pages, and I'd like to know when to stop the test and declare the leader as...

• Replies: 1
• Views: 1,537
06-09-2012, 10:36 PM

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