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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...

    Started by jwilliamsoh@hotmail.com‎, 01-19-2012 11:57 AM
    mean standard deviation
    • Replies: 3
    • Views: 6,960
    01-24-2012, 12:44 PM Go to last post
  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...

    Started by obicna89‎, 01-21-2012 02:49 PM
    • Replies: 1
    • Views: 1,760
    01-24-2012, 12:42 PM Go to last post
  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...

    Started by masarimk‎, 01-24-2012 08:42 AM
    • Replies: 0
    • Views: 1,473
    01-24-2012, 08:42 AM Go to last post
  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...

    Started by Qcv2011‎, 01-22-2012 12:31 AM
    • Replies: 0
    • Views: 1,530
    01-22-2012, 12:31 AM Go to last post
  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...

    Started by cima‎, 01-19-2012 08:27 AM
    bivariate regression, field, pattern, time series
    • Replies: 0
    • Views: 1,300
    01-19-2012, 08:27 AM Go to last post
  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....

    Started by NN_STAT‎, 01-19-2012 01:59 AM
    • Replies: 0
    • Views: 1,159
    01-19-2012, 01:59 AM Go to last post
  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...

    Started by noetsi‎, 01-13-2012 01:32 PM
    • Replies: 4
    • Views: 3,291
    01-13-2012, 07:06 PM Go to last post
  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 -...

    Started by samesheeshdiffday‎, 01-12-2012 03:34 AM
    • Replies: 0
    • Views: 1,895
    01-12-2012, 03:34 AM Go to last post
  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...

    Started by jshepar7‎, 01-12-2012 01:41 AM
    • Replies: 0
    • Views: 2,554
    01-12-2012, 01:41 AM Go to last post
  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...

    Started by jeffrymbothe‎, 01-11-2012 08:16 PM
    • Replies: 2
    • Views: 2,470
    01-11-2012, 09:38 PM Go to last post
  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...

    Started by mockefj‎, 01-10-2012 01:03 AM
    • Replies: 2
    • Views: 2,749
    01-10-2012, 03:57 AM Go to last post
  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...

    Started by Jgervin‎, 12-10-2011 03:24 PM
    • Replies: 2
    • Views: 2,155
    01-04-2012, 03:01 PM Go to last post
  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...

    Started by agsalomon‎, 12-31-2011 02:47 AM
    • Replies: 1
    • Views: 2,984
    01-04-2012, 02:56 PM Go to last post
  14. Post Finding the optimum point

    How can I fınd the optimum inventory level at the merchandise store? I need to fınd the optimum inventory level that a store can sustain. I know...

    Started by masarimk‎, 12-26-2011 02:34 PM
    • Replies: 9
    • Views: 5,215
    12-27-2011, 05:49 PM Go to last post
  15. 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,...

    Started by rize1159‎, 12-23-2011 11:48 AM
    • Replies: 1
    • Views: 2,975
    12-26-2011, 01:45 AM Go to last post
  16. 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...

    Started by srmt‎, 12-25-2011 08:23 AM
    • Replies: 2
    • Views: 3,325
    12-25-2011, 11:27 AM Go to last post
  17. Orthogonal Contrasts

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

    Started by asrat17‎, 12-25-2011 08:38 AM
    • Replies: 1
    • Views: 1,875
    12-25-2011, 09:12 AM Go to last post
  18. 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...

    Started by PNWstats‎, 12-23-2011 12:45 AM
    • Replies: 8
    • Views: 3,501
    12-23-2011, 04:45 PM Go to last post
  19. 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%...

    Started by parsec2011‎, 12-17-2011 06:40 AM
    • Replies: 1
    • Views: 2,681
    12-17-2011, 07:16 AM Go to last post
  20. 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...

    Started by whaffner‎, 12-13-2011 04:07 PM
    • Replies: 2
    • Views: 1,540
    12-15-2011, 11:05 AM Go to last post
  21. 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...

    Started by smotan‎, 12-14-2011 06:02 PM
    • Replies: 0
    • Views: 1,307
    12-14-2011, 06:02 PM Go to last post
  22. 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...

    Started by andrewH‎, 12-12-2011 07:09 PM
    • Replies: 1
    • Views: 67,692
    12-12-2011, 08:46 PM Go to last post
  23. 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...

    Started by Jgervin‎, 12-12-2011 03:27 PM
    • Replies: 4
    • Views: 2,068
    12-12-2011, 05:43 PM Go to last post
  24. 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...

    Started by Ageo7836‎, 05-19-2011 08:42 PM
    • Replies: 2
    • Views: 3,389
    12-10-2011, 05:33 PM Go to last post
  25. 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...

    Started by JohnSea‎, 12-08-2011 07:45 PM
    • Replies: 2
    • Views: 1,748
    12-09-2011, 07:20 PM Go to last post
  26. 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...

    Started by redone632‎, 12-09-2011 09:38 AM
    • Replies: 0
    • Views: 1,252
    12-09-2011, 09:38 AM Go to last post
  27. 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)...

    Started by winecoding‎, 12-05-2011 10:02 PM
    • Replies: 0
    • Views: 1,398
    12-05-2011, 10:02 PM Go to last post
  28. Bayes?

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

    Started by asangari‎, 12-05-2011 07:04 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 6,648
    12-05-2011, 06:45 PM Go to last post
  29. 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...

    Started by rafael_josem‎, 10-20-2011 07:33 PM
    • Replies: 6
    • Views: 24,399
    12-02-2011, 02:18 PM Go to last post
  30. 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...

    Started by dudunet‎, 10-22-2011 12:50 PM
    additive scales, estimating precision, household surveys
    • Replies: 2
    • Views: 3,780
    12-02-2011, 02:05 PM Go to last post
  31. 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...

    Started by michapma‎, 10-28-2011 04:56 AM
    • Replies: 1
    • Views: 2,746
    12-02-2011, 01:50 PM Go to last post
  32. Question 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

    Started by IFSergioa‎, 12-02-2011 01:38 PM
    • Replies: 1
    • Views: 5,607
    12-02-2011, 01:43 PM Go to last post
  33. 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...

    Started by Statzor‎, 11-18-2011 05:55 PM
    business statistic, sampling, sampling plan, strata, stratified sampling
    • Replies: 1
    • Views: 3,104
    12-02-2011, 01:39 PM Go to last post
  34. 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...

    Started by noetsi‎, 12-01-2011 07:50 PM
    • Replies: 2
    • Views: 2,165
    12-02-2011, 09:52 AM Go to last post
  35. 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...

    Started by Matthewb86‎, 12-02-2011 07:56 AM
    • Replies: 0
    • Views: 2,054
    12-02-2011, 07:56 AM Go to last post
  36. 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...

    Started by hideseek‎, 12-01-2011 06:05 PM
    predictive model, scoring
    • Replies: 0
    • Views: 1,277
    12-01-2011, 06:05 PM Go to last post
  37. 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...

    Started by hideseek‎, 11-29-2011 06:20 PM
    predictive model, testing, training, validation
    • Replies: 1
    • Views: 2,160
    11-29-2011, 06:29 PM Go to last post
  38. 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...

    Started by rockshell‎, 11-28-2011 12:33 PM
    • Replies: 0
    • Views: 1,403
    11-28-2011, 12:33 PM Go to last post
  39. 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...

    Started by raulduke87‎, 11-04-2011 04:01 PM
    • Replies: 1
    • Views: 2,934
    11-19-2011, 07:30 AM Go to last post
  40. 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...

    Started by Burt Hoovis‎, 11-18-2011 09:05 PM
    • Replies: 0
    • Views: 1,737
    11-18-2011, 09:05 PM Go to last post
  41. 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...

    Started by noetsi‎, 11-14-2011 08:36 PM
    2 Pages
    1 2
    • Replies: 23
    • Views: 6,290
    11-18-2011, 01:48 PM Go to last post
  42. 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...

    Started by gianmarco‎, 11-15-2011 02:27 AM
    • Replies: 2
    • Views: 2,335
    11-15-2011, 03:46 AM Go to last post
  43. 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: ...

    Started by vphan27‎, 11-14-2011 06:28 PM
    • Replies: 0
    • Views: 3,853
    11-14-2011, 06:28 PM Go to last post
  44. 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...

    Started by mhanö‎, 10-31-2011 11:20 PM
    classification, cross-validation
    • Replies: 3
    • Views: 3,020
    11-14-2011, 12:28 PM Go to last post
  45. 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...

    Started by ediSci‎, 11-14-2011 06:28 AM
    biology, engineering, fft
    • Replies: 0
    • Views: 2,304
    11-14-2011, 06:28 AM Go to last post
  46. 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...

    Started by requejo14‎, 11-13-2011 05:58 AM
    microsoft, revenue, time series, yahoo
    • Replies: 4
    • Views: 5,598
    11-13-2011, 05:31 PM Go to last post
  47. will high correlation between covariates in a regression model invalidate t-stat?

    deleted. I figured it out. Thank you.

    Started by Arwa Joher‎, 11-13-2011 02:20 PM
    multicollinearity, regession, t-statistic
    • Replies: 0
    • Views: 2,342
    11-13-2011, 02:20 PM Go to last post
  48. 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...

    Started by Punzel‎, 05-26-2011 06:50 AM
    • Replies: 2
    • Views: 4,017
    11-12-2011, 05:18 PM Go to last post
  49. 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...

    Started by BigBugBuzzz‎, 11-09-2011 04:56 PM
    decomposing, variance, variance decomposition
    • Replies: 13
    • Views: 4,967
    11-11-2011, 03:39 PM Go to last post
  50. 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...

    Started by NN_STAT‎, 11-09-2011 11:45 AM
    • Replies: 1
    • Views: 3,073
    11-09-2011, 12:45 PM Go to last post
  51. Trading question

    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)....

    Started by Rosebud‎, 10-14-2011 10:41 AM
    • Replies: 7
    • Views: 2,866
    11-08-2011, 06:54 PM Go to last post
  52. 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...

    Started by noetsi‎, 11-08-2011 06:21 PM
    • Replies: 3
    • Views: 2,944
    11-08-2011, 06:46 PM Go to last post
  53. 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...

    Started by alokmahor‎, 11-06-2011 12:40 PM
    grouped data, median
    • Replies: 0
    • Views: 2,827
    11-06-2011, 12:40 PM Go to last post
  54. 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....

    Started by noetsi‎, 11-04-2011 12:59 PM
    • Replies: 4
    • Views: 8,319
    11-04-2011, 03:51 PM Go to last post
  55. 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...

    Started by Maudley‎, 11-01-2011 06:55 PM
    failure, life data, out of box, weibull, zeros
    • Replies: 0
    • Views: 1,515
    11-01-2011, 06:55 PM Go to last post
  56. 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...

    Started by Ironic_Bird‎, 10-30-2011 02:40 PM
    forecasting, trend, unit root
    • Replies: 0
    • Views: 1,753
    10-30-2011, 02:40 PM Go to last post
  57. 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...

    Started by SlideRule‎, 10-30-2011 01:52 PM
    • Replies: 0
    • Views: 1,845
    10-30-2011, 01:52 PM Go to last post
  58. "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...

    Started by statbz‎, 10-27-2011 04:55 AM
    statistical test
    • Replies: 3
    • Views: 2,974
    10-28-2011, 11:32 AM Go to last post
  59. Question Anomaly in modeling sub-populations


    Started by jessica01‎, 10-27-2011 03:57 PM
    • Replies: 0
    • Views: 1,887
    10-27-2011, 03:57 PM Go to last post
  60. 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 ...

    Started by Berry‎, 10-22-2011 01:15 AM
    • Replies: 3
    • Views: 3,623
    10-22-2011, 09:24 AM Go to last post

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