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# Forum: Applied Statistics

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

1. ### Linearity

A key issue for me is to determine if my data is non-linear and determine ways to make it linear if possible. An approach that looks promising to me...

• Replies: 47
• Views: 11,511
10-05-2014, 09:24 PM
2. ### Poisson distribution and muon decays

Hello, I have gathered muon decay data and used R's non linear least squares function to find the mean muon lifetime. I did this by taking the...

• Replies: 1
• Views: 2,796
BGM
10-05-2014, 04:03 PM
3. ### Statistics of fault indicator and maintenance for repairable fleet

There is a fleet of repairable units and the units have system health measurements which consist primarily of vibration amplitudes. The health...

• Replies: 0
• Views: 2,010
10-03-2014, 06:12 AM
4. ### Comparing estimates from a mixed-effect model and submodels

Hi, I have a estimated coefficients for mixed-effect logistic regression model with three factors (A, B, C) and three interactions. The estimates ...

• Replies: 0
• Views: 1,127
10-01-2014, 08:41 PM
5. ### beta distribution

Alpha and beta are two parameters that jointly determine the shape of a beta distribution. So far I have not found a good discussion of what these...

• Replies: 18
• Views: 3,580
10-01-2014, 04:41 PM
6. ### Exponential Smoothing Books

I have spent a really long time looking for good books on this topic. I found one using SAS (Milhoj), but it only covered a small portion of what I...

• Replies: 0
• Views: 1,119
09-29-2014, 09:17 AM
7. ### longitudinal multivariate data - multivariate repeated measures

Hi! Am dealing with a multivariate longitudinal data where we collect data from two group of subjects (cases and controls) at baseline , one month...

• Replies: 1
• Views: 1,179
09-28-2014, 11:34 AM
8. ### Two-stage fixed-effects panel model - how should I interpret the coefficients?

Hello all: I ran a 2-stage fixed-effects panel model in R. The goal is to find the effect of strategic alliance participation on firm performance....

• Replies: 0
• Views: 2,996
09-28-2014, 11:23 AM
9. ### Bonferoni when running multiple models

Like lots of other people I suspect :p I commonly run many models with the same data. For example I might run five variables, than transform one and...

• Replies: 2
• Views: 1,224
09-25-2014, 09:08 PM
10. ### Testing when one year's sales volumes vary significantly from this time last year

Hi all, I have a puzzle regarding sales volumes and how to know whether, 6-months into the year, for example, my current volume is on track for...

• Replies: 0
• Views: 1,142
09-25-2014, 10:28 AM
11. ### Assumption Wilcoxon signed rank test

This is analogous to a one sample t test. I have found what seems like disagreement about the assumptions of this method. Some say that it only...

• Replies: 6
• Views: 1,791
09-25-2014, 10:07 AM
12. ### Variance decomposition

I am trying to compute a variance decomposition, based on a variance components model. Specifically, price variability explained by variability...

• Replies: 0
• Views: 926
09-23-2014, 03:23 PM
13. ### New Member Assistance: RPI Calculation for Sports Application

I am a volunteer with the Ontario minor hockey system and we are investigating ranking systems for our youth teams. Is anyone aware where I could...

• Replies: 0
• Views: 1,177
09-22-2014, 11:11 AM
14. ### do we need to test for stationarity if not using autocorrelation?

hi everyone, just a quick question. i know for time series, we need to test for stationarity before we can run ARIMA type models. what if i am just...

• Replies: 6
• Views: 1,961
09-22-2014, 10:25 AM
15. ### autocorrelation tests

Hi everybody, I have a question about residual autocorrelation tests on eviews 8 student version. I estimated a var model, and I'd like to test...

• Replies: 0
• Views: 3,524
09-21-2014, 09:58 AM
16. ### would like ffedback on right Machine Learning Method to apply

Hi I am new to big data and I am trying to decide on a learning project to do. I have a imaginary "new" widget design out in the field being...

• Replies: 0
• Views: 1,024
09-17-2014, 09:54 PM
17. ### Customer segmentation effectiveness

Hi, I have a question. I have a dataset of a few customer segments, their customers, the products they bought and the margin at the moment of...

• Replies: 0
• Views: 763
09-17-2014, 04:44 PM
18. ### A/B/C Conversion Optimisation

Hi All, I'm trying to understand the process behind testing both A/B site changes for statistically significant increases in conversion rate, and...

• Replies: 0
• Views: 1,049
09-17-2014, 02:29 AM
19. ### experiment results between workers in a laboratory - which test

Hi all, (this is my first post) I need to compare the performances of technicians in the lab for a specific experiment. There is no defined or...

• Replies: 4
• Views: 1,785
09-16-2014, 01:00 PM
20. ### Statistical procedure problem

Hello. I recently entered the world of corporate data mining, and I'm a bit stumped with a request from my boss. I'm pretty well versed on a variety...

• Replies: 0
• Views: 932
09-13-2014, 03:45 PM
21. ### Urgent Help needed regarding r1 Autocorrelation

I'm searching from past 2 hours on the internet and I'm unable to find a solved example of calculating r1 first coefficient of correlation from the...

• Replies: 1
• Views: 1,895
09-10-2014, 08:10 PM
22. ### How to compare pre-post outcome when each subject react differently?

I have 11 subjects with pre and post outcome (two repeated measures). I'd like to test the difference between both conditions. The problem is...

• Replies: 6
• Views: 1,892
09-10-2014, 03:09 PM
23. ### Weekly Event Probability in a time Range

Hi All, I am a humble student Engineer/Software Developer that has not touched anything other than BAsic statistics. I have been given the task of...

• Replies: 0
• Views: 1,179
09-05-2014, 02:18 AM
24. ### Which test? - Significance of Sample Size

Hi all, (First-time poster) I'm working with tagging data for 35 tracked fish. Each fish was tracked of 3 seasons, with detections (3873 overall)...

• Replies: 5
• Views: 1,835
09-02-2014, 11:21 AM
25. ### Compare a trial and control

I want to be able to work out if the results of trials are significant. Assume I have the data for a control and a Trial. The number of samples in...

• Replies: 1
• Views: 1,286
09-01-2014, 07:47 AM
26. ### cox proportional hazard question

Usually if you have a categorical variable with more than two levels one level is not coded as a dummy (this is the reference level). In regression...

• Replies: 6
• Views: 1,611
08-30-2014, 02:40 AM
27. ### Pasimonious Model for Neural Networks forecasting, I am really confusing.

Hello People I recently studied Neural Networks forecasting and some interesting question arose while I am reading various articles on the net. ...

• Replies: 0
• Views: 1,318
08-27-2014, 06:53 AM
28. ### B2B Sales revenue data and Time Series analysis

Hello, I am a new member. I have a data set at work that includes quarterly revenue data over 3 consecutive years. Depending upon the product...

• Replies: 1
• Views: 1,275
08-26-2014, 04:54 AM
29. ### Sample Size For Marketing

Lets say I put an ad up on a website and pay some amount every time someone views it. In order to make a profit I need 1/x (x varies so it can be...

• Replies: 0
• Views: 1,091
08-26-2014, 12:01 AM
30. ### Network Probability on a givien server

• Replies: 0
• Views: 749
08-25-2014, 06:19 PM
31. ### Passing from daily pds probability to annual probability

Hello, I'm stuck on the next conversion or adjustment. I have the following problem, I'm using Weibull observational probability (order/(N+1) on my...

• Replies: 0
• Views: 2,108
08-24-2014, 04:56 PM
32. ### Which analysis? Measured versus modeled

Hello, I'm having trouble deciding which type of statistical analysis I should use to compare my modeled data to my measured data and was...

• Replies: 1
• Views: 1,941
08-23-2014, 04:32 AM
33. ### Cointegration in Non-linear time series

I have the following problem: In*non-linear time series regression yt = g(xt)+et, if xt is non-stationary (i.e. I(1)) and yt is stationary (i.e....

• Replies: 0
• Views: 1,075
08-20-2014, 03:45 PM
34. ### Treating multiple observations per object

My data consists of thousands of machine elements, their price, as well as technical and non-technical attributes. Most of the data is categorical ...

• Replies: 0
• Views: 831
08-20-2014, 12:25 PM
35. ### Non-parametric methods

A book I am reading now on non-parametrics argues that t test may be still accurate in large sample sizes even if the distribution assumptions are...

• Replies: 27
• Views: 5,080
08-19-2014, 09:14 AM
36. ### Overall Effect of CRM/Marketing programme

I currently have ...

• Replies: 0
• Views: 2,469
08-18-2014, 01:33 PM
37. ### Sports Ratings: Is it Possible to Rate Teams from Different Years?

Hello, I am new to the forum, but I have taken statistics in college. I would like to apply an algorithm, so I can compare high school football...

• Replies: 0
• Views: 1,381
08-08-2014, 06:04 PM
38. ### Measuring Changes in Variable Relationship Over Time

Hi, I am trying to monitor the relationship between two variables over time and detect when a signifcant change in the relationship between them...

• Replies: 0
• Views: 1,356
08-08-2014, 07:51 AM
39. ### STATA - Survival Analysis

Hello everyone, I am working on a dataset (IPOs) and trying to code those that fail and those that survive. Basically I am coding IPOs that...

• Replies: 0
• Views: 1,123
08-08-2014, 02:25 AM
40. ### STATA - Regression with decreasing sample + save t-statistics

Hi all, I am working with the following data: stick year q diff_unemploy 2.03 1975 1 0.031 1.28 1976 1 -0.005 0.92 1977 1 -0.002...

• Replies: 1
• Views: 2,271
08-06-2014, 02:07 AM
41. ### Bootstrapping residuals

Hi! I am writing my master thesis in mutual funds in norway. in this I have to bootstrap some residuals according to the method of Kosowski et al...

• Replies: 0
• Views: 2,414
08-05-2014, 07:40 AM
42. ### selecting reporting stat for Johansen Test for Cointegration

All, I am running a Johansen test to test for co-integration and do not find an statistically significant result in either the max eigenvalue...

• Replies: 1
• Views: 1,824
08-04-2014, 11:00 AM
43. ### Box Cox Transformation on time series

Hi, I want to apply box cox transformation on my time series. I was just wondering can I apply the transformation on any time series or do i have...

• Replies: 0
• Views: 1,345
08-01-2014, 11:50 AM
44. ### Time Series Analysis

I have data that is spatial and temporal. Each data point at each time contains multiple signals of interest (some are spatially autocorrelated, some...

• Replies: 3
• Views: 1,769
07-31-2014, 10:30 AM
45. ### Justifying studying simulations

Here I am talking about simulations such as monte carlo. I have often seen these used in statistical text/articles, for example to test an assumption...

• Replies: 4
• Views: 1,594
07-29-2014, 12:56 AM
46. ### Handling Pearson's spurious correlation problem

Hi all, I'm working on an analysis question for my organization. We recently introduced a new team of system analysts to augment the role the...

• Replies: 2
• Views: 1,329
07-28-2014, 09:21 AM
47. ### After model selection: Estimated parameters are not reliable

Hello, I have conducted an experiment which manipulated three factors (Factor 1: 3 levels, Factor 2: 2 levels, Factor 3: 2 levels). The response...

• Replies: 13
• Views: 2,408
07-28-2014, 03:06 AM
48. ### Puzzled by Correlation

This is a real problem although I'm using a made-up statistic (# of apples) for this. Say I am interested in how many apples people eat in a year....

• Replies: 5
• Views: 1,788
07-26-2014, 09:09 AM
49. ### What is and is not a convenience sample

It is well accepted that 'convenience samples" can not be used to make statistical inference, essentially because they are not a random sample of the...

• Replies: 10
• Views: 2,727
07-25-2014, 01:32 AM
50. ### Average in semi dependent observations.

I have a dataset of measurements (i.e., differences; which are continuous), with some individuals contributing a single measurement while others have...

• Replies: 4
• Views: 1,342
07-24-2014, 06:59 PM
51. ### How to assess impact over time

I am looking at rehab rates (which are coded either successful or unsucessful)) and factors which influence them. This is a case where both the rehab...

• Replies: 0
• Views: 1,272
07-23-2014, 05:04 PM
52. ### Adjusted Exponential Smoothing w a trend

Hello, I am in need of help for my applied statistics class. I have read the book and looked on the internet for the help but I am still lost....

• Replies: 1
• Views: 1,111
07-22-2014, 10:31 AM
53. ### Historical Unemployment Forecast Data. Where can I find it?

Hi, I am trying to find Historical Unemployment Forecast data. Harder than expected. Anybody knows where to find that? I am also looking for...

• Replies: 3
• Views: 2,621
07-17-2014, 08:21 PM

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