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# Forum: Applied Statistics

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

1. ### Help on analysis of simulation results

Hello. I am performing simulations on a project (changing durations of activities randomly from lognormal distribution). I perform 100 simulation...

• Replies: 0
• Views: 1,136
01-17-2014, 09:30 AM
2. ### Time series again

When you are detrending data (obviously this involves determanistic trends not stocastic ones) do you simply regress the time series versus time and...

• Replies: 6
• Views: 2,024
01-15-2014, 04:42 AM
3. ### Equality of Variance for Paired Data- alternative for Leven's Test?

Hello, I have set up an experiment that tests 3 instruments on 35 different people. Each person gets tested three times with each instrument (see...

• Replies: 5
• Views: 2,131
01-15-2014, 03:26 AM
4. ### Converting the payoff from brackets to table format

Hi all, I'm stuck on a question which includes the following: - there are 3 games: A, B, C - the "favourite" strategy consists of putting £2...

• Replies: 2
• Views: 1,456
01-15-2014, 02:49 AM
5. ### Arellano-Bond estimation with autocorrelation

Hallo everybody, i have been trying to model the impact of volatility in new product introductions on demand volatility. Both variables per se are...

• Replies: 0
• Views: 2,062
01-08-2014, 08:05 AM
6. ### algorithm to generate multivariate, non-normal data with missing data patterns

ok, so here is a more-detailed explanation of my question using an example. vinux and Dason (and everybody else) have been very kind in helping me...

• Replies: 1
• Views: 3,093
01-07-2014, 03:02 PM
7. ### Help with Probabilistic Modeling with many elements in simulation with unknown probs.

1. I'm wanting to create a probabilistic model based on several simulations, where I have a binary outcome (go or no-go) and a variable input. The...

• Replies: 1
• Views: 1,438
01-06-2014, 05:46 PM
8. ### Test for Equality instead of Correlation ?

Hello, is there a test for checking if x1 = x2 ? Meaning: a test that can tell the difference between x1=1*x2 and x1=2*x2. It should also work...

• Replies: 6
• Views: 2,581
01-05-2014, 05:47 PM
9. ### EVT - Mean excess plots / Hill plots

Hello, I just wanted to know if anyone knew of any good resources (papers/textbooks) in describing Extreme Value Theory. In particular, I want to...

• Replies: 0
• Views: 3,826
01-03-2014, 10:46 AM
10. ### Model Options

I have been very busy lately and unable to find time to think about the following analytical project. Given this, I am eliciting feedback and...

• Replies: 4
• Views: 1,793
12-31-2013, 08:34 AM
11. ### Help identifying appropriate test for statistical significance of event

My apologies for the title of the post as it is a bit difficult to explain in 50 characters. Here is the situation followed by the goal: ...

• Replies: 2
• Views: 1,766
12-27-2013, 07:43 AM
12. ### logisitic regression number of fails and success

Dear All, I am going to run logistic regression and my question is in my model should the number of fails be the same as number of success ? Let's...

• Replies: 6
• Views: 1,588
12-25-2013, 10:45 PM
13. ### Need single percentile conversion for ACT composite scores. Any resources?

Hi all, I am in need of a conversion scale for ACT scores to percentile that is more granular than what is on the ACT website. Their scale only...

• Replies: 0
• Views: 1,088
12-25-2013, 03:38 PM
14. ### ARIMA and differencing of input variables

Dickey notes in his book on SAS and time series, that you can use explanatory variables in ARIMA (SAS calls these input variables and the way the...

• Replies: 1
• Views: 1,520
12-23-2013, 10:55 AM
15. ### Seasonal stationarity

I am studying ARIMA and ARIMAX these days . In reading this something occured to me I had not thought of. How is it that you test for stationarity...

• Replies: 2
• Views: 1,588
12-23-2013, 10:20 AM
16. ### Programming a rolling time frame

Hi! I'm hoping you guys could help me with this. I want to do a rolling time frame with a VAR model. More specifically: I want the VAR model to...

• Replies: 0
• Views: 1,508
12-21-2013, 05:45 AM
17. ### Modifying an ESM design

I am running exponential smoothing. We ran projections and now we are comparing the projections to the actual results. One month's actual data was...

• Replies: 1
• Views: 1,435
12-20-2013, 02:47 PM
18. ### Forecasts errors

There are many ways to look at which model predicts best in time series (exponential smoothing is the one I am focusing on here). MSE, MAPE etc....

• Replies: 0
• Views: 1,442
12-17-2013, 03:48 PM
19. ### using Statistical methods to solve a business problem

Hi, i need to do a project on "using Statistaical methods to solve a business problem" ...plz provide some ideas and help

• Replies: 1
• Views: 1,503
12-17-2013, 10:20 AM
20. ### churn models

Dear All, I am working on churn models. My model based on the customers who churned on May-June 2013. The number of churned customers is 30000...

• Replies: 0
• Views: 1,644
12-16-2013, 07:00 AM
21. ### Study of landing go-arounds

The WSJ recently had an article (http://on.wsj.com/1d9qF1W) about a study of landing go-arounds at SFO and how pilots of foreign airlines have more...

• Replies: 0
• Views: 1,343
ihf
12-13-2013, 10:01 PM
22. ### Test for invertibility

I know a variety of methods to find if stationarity has been violated. Does anyone know one for invertability (key for MA in ARMA).

• Replies: 0
• Views: 1,686
12-13-2013, 05:32 PM
23. ### Ordinal variables for use in Confirmatory factor analysis

Hi Guys I am new here, just signed up and I already need your help ;) I am currently in a situation where i have to conduct a confirmatory factor...

• Replies: 1
• Views: 1,534
12-13-2013, 04:47 PM
24. ### Error bars for exponentially distributed data

Folks, Short version: What is the best and most proper way for displaying error bars on exponentially distributed data? Long version: I have...

• Replies: 2
• Views: 3,141
12-13-2013, 03:01 PM

I am student but I have difficulty with one task for homework. 3. Shoe salesman noticed that every month about 10% of the shoes of a producer...

• Replies: 0
• Views: 1,157
12-11-2013, 08:32 AM
26. ### Time series regression [what does this statement mean]

I ran across this in a discussion of time series regression and it makes no sense to me. It has to do with using hold out data to check the forecasts...

• Replies: 4
• Views: 1,783
12-10-2013, 06:52 PM
27. ### Correlation between binary and interval data?

Hi Does anyone know of any measure of correlation that can be used for a binary and an interval variable? A measure that does not assume normal...

• Replies: 11
• Views: 5,736
12-09-2013, 08:34 AM
28. ### Transforming negative data values without losing data relativity

Hi, I have data that is %change of a measure for 50 people and it has both positive & negative values (some people have +%, some people have -%). I...

• Replies: 1
• Views: 1,502
12-09-2013, 06:28 AM

Hi everyone, I need your help with this situation for which my untrained brain can't provide a solution. :) I hope I'm posting it in the right...

• Replies: 0
• Views: 1,410
12-05-2013, 04:37 PM
30. ### Structural break

We just totally changed our process - so that past data will not reflect the future at all (to be simple we just stoped taking a large group of...

• Replies: 6
• Views: 2,193
12-03-2013, 03:18 PM
31. ### Assumptions of time series

I believe, but am not certain, that time series methods which employ regression assume normality and equal error variance. Would you test for these...

• Replies: 15
• Views: 9,237
12-03-2013, 12:25 PM
32. ### Determanistic vs Stochastic trend

Trends may be either determanistic or stochastic in nature and assuming one is the other causes both forecasting and other errors. The trick is...

• Replies: 45
• Views: 10,468
12-03-2013, 12:12 PM
33. ### Finding out which data set is near to original one?

Here is the siuation in which i am stuck ORIGINAL VALUES 6,6,5,5,4,4,4,3,2,2,2,2,1 DATA SET-1 6,5,5,5,5,4,4,4,3,3,2,1,1 DATA SET-2...

• Replies: 0
• Views: 1,617
12-01-2013, 01:56 AM
34. ### Accuracy and precision in 3D Compare Analysis

Hi, We have utilized a new scanner that we want to evaluate. To be able to do this, we have used a reference scanner that is state of the art. ...

• Replies: 0
• Views: 1,261
12-01-2013, 01:25 AM
35. ### Arima

This is a very different taken on Moving Averages than I have ever seen before (the accounts I have seen before stress a sudden, temporary event at a...

• Replies: 0
• Views: 1,088
11-20-2013, 05:59 PM
36. ### Linearity of time series

Although I have never worked with these I understand that some time series are non-linear. How would you test for these (I assume this is different...

• Replies: 7
• Views: 1,866
11-20-2013, 12:53 PM
37. ### What analysis to use?

I'm trying to learn a bit here and I'm experimenting on some data I have available. The data is user records with data appended to each record that...

• Replies: 0
• Views: 1,168
11-19-2013, 09:06 PM
38. ### PACF for AR(2)

(Zt)t=Z~WN(0,sigma^2) ,independent equally distributed. Process Xt=SUM(j from 0 to +inf) fi^2j*Zt-2j, teZ satisfies AR(2) equation Xt=fi*Xt-2+Zt,...

• Replies: 8
• Views: 2,899
11-19-2013, 11:21 AM
39. ### Time series

Hello! Can someone help me with this: Y=X^2+Z, X,Z~N(0,1), independent equally distributed. How can I find projection od Y on span{1,X,Z}?

• Replies: 13
• Views: 2,537
11-19-2013, 09:43 AM
40. ### [help] cobb douglas function

The following is an estimate of a Cobb Douglas production function. Output=34.87 +0.98 Labour +0.87Capital + 2.76 month R-sq=0.86 F=79.98 ...

• Replies: 15
• Views: 3,944
11-17-2013, 11:51 PM
41. ### A Question about Econometrics

Suppose we estimate the following model:( y) ̂= .78t, where t is the time variable (t=1, 2, …, T). Suppose we calculate the residuals, res, and then...

• Replies: 1
• Views: 1,427
11-17-2013, 12:47 PM
42. ### suggest estimation strategy for finding unbiased estimators

Suppose we want to estimate how household expenditures on alcohol depend on average household income and changes in average household income. We take...

• Replies: 1
• Views: 1,640
BGM
11-17-2013, 12:29 PM
43. ### why regression equations are wrong and the other two are correct?

we want to see if there is income convergence when trade liberalization takes place. we use two measures. . The fi rst is the standard deviation of...

• Replies: 0
• Views: 1,180
11-16-2013, 06:41 PM
44. ### Testing for Statistical Significance - Kruskal's Relative Importance

Has anyone found a satisfactory way to test for significant differences between sub-groups (e.g., male/female) after running Kruskal's Relative...

• Replies: 0
• Views: 2,476
11-16-2013, 12:13 AM
45. ### Interpretation of the effect of AC and MC

I have always read, with some special exceptions such as Y lags when you have the AR error wrong, that multicolinearity and autocorrelation does not...

• Replies: 2
• Views: 1,464
11-15-2013, 02:52 PM
46. ### Price elasticity

Super basic question, nonetheless, I need help. When calculating price elasticity of demand for something should you remove the data immediately...

• Replies: 3
• Views: 1,423
11-14-2013, 05:02 PM
47. ### Sampling Q - why can't we replace non-responders by randomly selecting new ones?

We are planning a survey of schools to get state estimates of substance use among youth. We are doing a two-stage survey, where the first stage is a...

• Replies: 4
• Views: 1,858
11-14-2013, 08:49 AM
48. ### absolute mean and std of signed error

Hi, I'm using several infrared cameras to measure the motion of a robot travelling with a programmed velocity (ground truth). I obtained a...

• Replies: 3
• Views: 2,161
11-12-2013, 03:06 AM
49. ### [help] Dummy Variable how we check reliablity of dummy variable?

home work questions q1. Define concept of Dummy Variable ? by giving daily real life examples. q2. Asses the following regression outputs. is...

• Replies: 2
• Views: 1,576
11-09-2013, 06:09 PM
50. ### Help with Methodology for Political Poll

Hi guys, I'm currently in my first year of a mathematical sciences degree at university, and have been tasked with carrying out a political poll....

• Replies: 7
• Views: 1,553
11-09-2013, 03:43 PM
51. ### Interpreting coefficients of first differences of logarythms

Hi, I am new to talkstats.com, but I hope that one day I will be a proud member of this forum. So, my problem is interpreting coefficients of...

• Replies: 0
• Views: 1,959
11-07-2013, 05:01 PM

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