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# Forum: Applied Statistics

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

1. ### Mean and Standard Deviation on Different scales?

What is the reason why someone would take a mean based on a 5 point scale and then change it to a 4 point scale by multiplying by 0.8 and also report...

• Replies: 3
• Views: 6,960
01-24-2012, 12:44 PM
2. ### cluster analysis

hi! i found an example of cluster analysis: Data are 50 measurements on 13 variables. The number of reported deaths in 50 U.S. states and is...

• Replies: 1
• Views: 1,760
01-24-2012, 12:42 PM
3. ### Forecasting sales

Dear All, I am pretty sure there are some experts on my question to answer. Here is my question: I work in a retail company and everyweek I have...

• Replies: 0
• Views: 1,473
01-24-2012, 08:42 AM
4. ### time analysis

Hi, I would really appreciate some help. I'm analyzing a variable (appointcompl) for different clinics over time. I want to see if there is some...

• Replies: 0
• Views: 1,530
01-22-2012, 12:31 AM
5. ### Extracting a pattern and a time series from a field (fuzzy bivariate regression)

Hi everybody, first of all, sorry if my question is trivial or silly, but I'm definitely not much into statistics. I have some spatially extended...

• Replies: 0
• Views: 1,300
01-19-2012, 08:27 AM
6. ### Precision of measurements

Hello, I need an advice. I have a medical device that gives measurements for a patient using it. I need to calculate the precision of this device....

• Replies: 0
• Views: 1,159
01-19-2012, 01:59 AM
7. ### Analyzing reference levels of categorical variable

With a dummy regressor derived from a categorical var one level of the variable will not be directly shown by any dummy but will lie in the...

• Replies: 4
• Views: 3,291
01-13-2012, 07:06 PM
8. ### noise model, random process(es), (cross-)correlations?

hey all, I am doing some physics but got stuck, yet again :yup:, on a statistics related problem I consider being well suited to be asked here -...

• Replies: 0
• Views: 1,895
01-12-2012, 03:34 AM
9. ### How to Calculate Confidence Interval for Readmission Rates at Hospitals?

I have readmission rates for hospitals and I am looking to calculate a confidence interval for the readmission rates. So I have patients with an...

• Replies: 0
• Views: 2,554
01-12-2012, 01:41 AM
10. ### need help with real life wage dispute

OK. My former employer owes me back wages. I was employed for 99 weeks. My hours fluctuated from week to week. I have 40 weeks of data. How...

• Replies: 2
• Views: 2,470
01-11-2012, 09:38 PM
11. ### Sample size for very large population

Hey, I'm glad that I found a statistics forum, as it is a field that I'm struggling with! Thanks to all here who are willing to help someone like...

• Replies: 2
• Views: 2,749
01-10-2012, 03:57 AM
12. ### Product success

Is it possible to predict the probability of a products success based on past products or is each product individual, such as flipping a coin? If...

• Replies: 2
• Views: 2,155
01-04-2012, 03:01 PM
13. ### Dealing with treatment variable that is both ordinal and categorical

I am dealing with an issue related to a study of 4 treatment groups, which were randomly assigned to a specific population, however due to...

• Replies: 1
• Views: 2,984
01-04-2012, 02:56 PM
14. ### Supplier relation to product deterioration

We are conducting a study of relationship between product deterioration and its year of manufacturing and supplier. e.g I have three suppliers G,...

• Replies: 1
• Views: 2,975
12-26-2011, 01:45 AM
15. ### Distributions in articles

Hi everyone I have to find two articles.One of them should be the application of normal distribution and another should be the application of...

• Replies: 2
• Views: 3,325
12-25-2011, 11:27 AM
16. ### Orthogonal Contrasts

first my research experiment is to determine the coffee fermentation time by the use of coffee demucilaging machine. the factorial crd experiment...

• Replies: 1
• Views: 1,875
12-25-2011, 09:12 AM
17. ### Grouping variables

Hi, I have a set of N observations of m variables (let's call the variables A,B,C,...). What I'd like to do is group the variables in non...

• Replies: 8
• Views: 3,501
12-23-2011, 04:45 PM
18. ### Validity of standard error in surveys where all the population can participate

Hi The problem is the following: A firm sends out an invitation to all of its customers (in total=1000) to participate in an online survey. 70%...

• Replies: 1
• Views: 2,681
BGM
12-17-2011, 07:16 AM
19. ### Cluster Analysis questions

I've been tasked with coming up with some new models of some behavioral data, and while the modeling part isn't causing any problems, I do have one...

• Replies: 2
• Views: 1,540
12-15-2011, 11:05 AM
20. ### t student question

I am facing some troubles solving this example... can someone please help me? We select a random sample of 10 mutual funds. Suppose that the yield...

• Replies: 0
• Views: 1,307
12-14-2011, 06:02 PM
21. ### Monte Carlo analysis – choosing a distribution

I have several samples from datasets drawn from mixed political and economic data. On a univariate level, much of the data is clearly not normally...

• Replies: 1
• Views: 67,692
12-12-2011, 08:46 PM
22. ### Correlation based on %`

I have some data as follows (ignore that the % calculations are incorrect, based on column2/column1 = column3 as I didn't do the math). My question...

• Replies: 4
• Views: 2,068
12-12-2011, 05:43 PM
23. ### EIS instrumental variables

Hi guys, I am running a simple IV regression model to test whether the coefficient of EIS is equal to 1. I was wondering if anyone knew an...

• Replies: 2
• Views: 3,389
12-10-2011, 05:33 PM
24. ### EM Algorithm - Help please

I am working through an EM algorithm application for the first time and have a basic question. I am using it to estimate the unconstrained demand...

• Replies: 2
• Views: 1,748
12-09-2011, 07:20 PM
25. ### Minimum Distance Estimator over MLE?

I'm trying to fit a lognormal distribution to a set of data. The histogram shows what looks like a lognormal shape. However, when I calculate the...

• Replies: 0
• Views: 1,252
12-09-2011, 09:38 AM
26. ### sampling issue for a data set with an embedded pattern

I have a large set of data sets. For instance, it has 30000 data points, which are identified as 1, 2, 3,…30000. For notational purposes, D(i)...

• Replies: 0
• Views: 1,398
12-05-2011, 10:02 PM
27. ### Bayes?

Hi All, My question is: Where to go with Bayes?

• Replies: 19
• Views: 6,648
12-05-2011, 06:45 PM
28. ### Sample size for really small populations

Hello, I'm about to do a research. This research involves a very small population (100 approx), but having the whole population for study would be...

• Replies: 6
• Views: 24,399
12-02-2011, 02:18 PM
29. ### Household surveys: Estimating precision for indices built at individuals level

I am using survey data that contains information of households and of individuals (household members). The sample size was determined at household...

• Replies: 2
• Views: 3,780
12-02-2011, 02:05 PM
30. ### Ranking of jury votes: what's the appropriate distrubiton?

Hello, I have a nice problem in a practical situation begging for a proper statistical analysis. I've taken over responsibility for evaluating the...

• Replies: 1
• Views: 2,746
12-02-2011, 01:50 PM
31. ### what are the minimun sample size to calculate CPk

I want to know if there is a minimum sample size to calculate CPk during a process? Thanks a lot. Sergio Avila

• Replies: 1
• Views: 5,607
12-02-2011, 01:43 PM
32. ### Minimum stata sample size in stratification?

Hi, I'm designing a methodology to track the effects of a price test at work, and I'm curious to know whether there are limits on how many strata...

• Replies: 1
• Views: 3,104
12-02-2011, 01:39 PM
33. ### Outliers

I am doing an outlier analysis (with data I know to be highly skewed). I was using a Tukey box plot to determine outliers. But now I am splitting the...

• Replies: 2
• Views: 2,165
12-02-2011, 09:52 AM
34. ### Predictive Statistical Analysis

Hi, I have a statistical problem I am hoping someone can point me the right direction methods wise. I have a dataset giving a large amount of...

• Replies: 0
• Views: 2,054
12-02-2011, 07:56 AM
35. ### predictive model's scoring issue

Suppose I have built a model to predict default on loans. In my modeling data set I have three independent variables: income, home(own or rent) and...

• Replies: 0
• Views: 1,277
12-01-2011, 06:05 PM
36. ### real world predictive model validation and testing issues

I have a real world business problem of selecting products to recommend to our contacts in an email campaign. The data set I have contains the...

• Replies: 1
• Views: 2,160
11-29-2011, 06:29 PM
37. ### Overtime Calculation

I am trying to estimate the overtime budget for next year but am struggling. I have the total number of hours estimated to be worked and the number...

• Replies: 0
• Views: 1,403
11-28-2011, 12:33 PM
38. ### Event-study T-tests

Hi! I am currently writing my master thesis and I'm performing an event-study. My sample is made up of 261 elements and the event date is the same...

• Replies: 1
• Views: 2,934
11-19-2011, 07:30 AM
39. ### Help an ultrarunner out with a real life probability problem

This may be simple for many of you on here, but I am writing as an athlete, not as a statistician. Here goes: Entry to the upcoming WS 100 mile...

• Replies: 0
• Views: 1,737
11-18-2011, 09:05 PM
40. ### What is Hierarchial Linear Regression used for?

This is associated with multilvel analysis. I am considering taking a course considered doctoral in this in the spring and I was hoping to get a...

• Replies: 23
• Views: 6,290
11-18-2011, 01:48 PM
41. ### help in devising a plain definition of "noise" in datasets

Hi All, in my PhD dissertation I am making use of Correspondence Analysis to explore datasets in search of meaningful structures (namely, patterns...

• Replies: 2
• Views: 2,335
11-15-2011, 03:46 AM
42. ### Question about Statistics Applied to C=0 Zero Acceptance Number Sampling Plan

My company is using the following sampling table based on Nicholas Sequigla's Zero Acceptance Number Sampling Plan: ...

• Replies: 0
• Views: 3,853
11-14-2011, 06:28 PM
43. ### Comparing classification results with cross-validation

Hi all, I have several questions regarding cross-validation to compare binary classifier accuracies: I like to classify molecules in biologically...

• Replies: 3
• Views: 3,020
11-14-2011, 12:28 PM
44. ### Interpreting FFT of biological data

Hi all, I'm a biological scientist and I'm trying to interpret a FFT of some biological data. Background: I have monitored the length of time...

• Replies: 0
• Views: 2,304
11-14-2011, 06:28 AM
45. ### Time series analysis to forecast revenue

Hi, I work in OpFin for a search agency. Our clients work with 3 different platforms (Google, Yahoo and Microsoft) and 2 of them (Yahoo! and...

• Replies: 4
• Views: 5,598
11-13-2011, 05:31 PM
46. ### will high correlation between covariates in a regression model invalidate t-stat?

deleted. I figured it out. Thank you.

• Replies: 0
• Views: 2,342
11-13-2011, 02:20 PM
47. ### Compare two regression functions?

Hi all, I ran into a problem with the analysis of some experimental data and I am hoping someone in here will be able to help me out. I have...

• Replies: 2
• Views: 4,017
11-12-2011, 05:18 PM
48. ### Decomposing total variance of profits into variance from loss and variance from gain

Hello, Consider the profit stream of a firm. This profit stream consists of losses and gains. Suppose that I am interested in investigating the...

• Replies: 13
• Views: 4,967
11-11-2011, 03:39 PM
49. ### Error Range

Hi Guys, I have a medical machine that when being used by a patient, returns an output. I want to measure the error range of the machine. I took...

• Replies: 1
• Views: 3,073
11-09-2011, 12:45 PM

Thanks for having me on board. I'm going to have a good look around the site. I have a question related to my trading (I trade political futures)....

• Replies: 7
• Views: 2,866
11-08-2011, 06:54 PM
51. ### Simple question on IQR calculations.

I am manually calculating the range for outliers in boxplots (because the SAS I have does not show the ID of outliers in boxplots). It is (i.e., the...

• Replies: 3
• Views: 2,944
11-08-2011, 06:46 PM
52. ### how to calculate median of grouped data if group size is variable

I learned in school that Median = L + (n/2-cf)*h/f where L = lower limit of median class n = no. of observations cf = cumulative...

• Replies: 0
• Views: 2,827
11-06-2011, 12:40 PM
53. ### Outlier analysis with badly skewed data

I have a data set which is badly skewed. It is beyond the acceptable levels (skew over 3) after I remove ten extreme points. So I have two questions....

• Replies: 4
• Views: 8,319
11-04-2011, 03:51 PM
54. ### Life data analysis zero time failures problem

Hi, I have life data which contains time to failures of zero, I'm really not sure which distribution I should use to analyse this data, i've tried...

• Replies: 0
• Views: 1,515
11-01-2011, 06:55 PM
55. ### Forecasting with stochastic trends and unit roots

I'm dealing with a set of data with a unit root and a stochastic trend for class and am trying to make a forecast. any help would be greatly...

• Replies: 0
• Views: 1,753
10-30-2011, 02:40 PM
56. ### Close-approach track analysis

I have a geospatial analysis problem to work out. I've been asked to examine several million vehicle lat/lon/time position records and report on...

• Replies: 0
• Views: 1,845
10-30-2011, 01:52 PM
57. ### "which file should be deleted ?" using statistics theory

Hi, Let's say I'm a poor disk provider. I allow people to upload and remote access to files on my computer. Since I'm poor I don't have budget to...

• Replies: 3
• Views: 2,974
10-28-2011, 11:32 AM
58. ### Anomaly in modeling sub-populations

..........

• Replies: 0
• Views: 1,887
10-27-2011, 03:57 PM
59. ### Orthogonal Contrast

I do have a problem understanding this particular branch of ANOVA. My major concern is how to construct an ANOVA table - for example A ...

• Replies: 3
• Views: 3,623
10-22-2011, 09:24 AM

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