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Forum: Applied Statistics

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

  1. An average of standard deviations?

    Hello, My apologies if this isn't the correct forum for this, but I'm trying to analyze some data and can't figure out how to obtain an accurate...

    Started by indoze‎, 11-05-2010 08:53 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 211,783
    02-23-2017, 10:18 AM Go to last post
  2. what to do after a chi˛ test

    hey, i compared the frequency of samples containing zero pupa vs samples containing at least one pupa in different stations. i carried out a chi˛...

    Started by adrienbaudouin‎, 06-25-2010 09:10 AM
    • Replies: 3
    • Views: 144,844
    06-26-2010, 12:49 PM Go to last post
  3. Kaplan–Meier - Cancer Survival Rates

    Hi, I'm doing a degree project on a comparison of Cancer Survival Rates for two ten year periods for different cancer types and am having great...

    Started by wanchosen‎, 12-02-2010 07:12 AM
    • Replies: 2
    • Views: 90,249
    12-03-2010, 04:17 AM Go to last post
  4. 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: 67,686
    12-12-2011, 08:46 PM Go to last post
  5. Exclamation Formula for Cohen's d effect size

    Help!! I am struggling to figure out the effect size formula ( the spooled part) to get the effect size calculation. I have two groups (55 and 33)...

    Started by valkyerie11‎, 07-24-2010 04:14 PM
    • Replies: 12
    • Views: 64,559
    07-24-2010, 07:13 PM Go to last post
  6. Logit v. Probit: A fight to the death

    Every now and then I have to work with binary responses with continuous covariates. So of course this screams generalized linear model. The...

    Started by Dason‎, 09-13-2011 09:59 PM
    5 Pages
    1 2 3 ... 5
    logit, probit
    • Replies: 67
    • Views: 38,685
    04-08-2015, 12:47 PM Go to last post
  7. Real life examples for the following distributions

    Hello everyone, Can anyone please tell me some real life examples, maybe with a bit of explanation for the following distributions: normal,...

    Started by Snoo‎, 10-27-2010 09:56 AM
    • Replies: 3
    • Views: 31,756
    10-27-2010, 10:12 AM Go to last post
  8. How to calculate probability of a failure for Reliability theory (Exponential dist)?

    Lets talk Reliability theory, failure rates, MTBF, etc. We are going to assume single-point failure (no redundancy), and the exponential...

    Started by Bullethead‎, 01-26-2012 11:56 AM
    • Replies: 2
    • Views: 29,865
    01-26-2012, 02:23 PM Go to last post
  9. LCROSS results: Given a 2σ upper limit can you get expected value?

    Hi all, this is my first post. I've looked everywhere else; maybe you guys can help me with what should be fairly simple question. It has to do...

    Started by Warren Platts‎, 03-23-2013 03:20 PM
    • Replies: 0
    • Views: 25,620
    03-23-2013, 03:20 PM Go to last post
  10. Estimating standard deviation from paired data

    I work advising chemical analysts as best I can on statistics. There is one issue that I am really struggling with and would really appreciate some...

    Started by wesbell‎, 09-08-2010 06:06 PM
    • Replies: 1
    • Views: 24,913
    09-08-2010, 10:19 PM Go to last post
  11. 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: 24,373
    12-02-2011, 02:18 PM Go to last post
  12. roc analysis in spss

    Hello, I am analyzing some data from 2 diagnostic tests and I want to do a ROC analysis in SPSS. However I don't have any experience with this, so...

    Started by noob‎, 08-18-2010 04:40 PM
    • Replies: 1
    • Views: 24,357
    08-18-2010, 04:48 PM Go to last post
  13. Principal component analysis

    I have a problem with the analysis of my dissertation. The topic is constructed wetlands and I have measured a set of variables to categorise these,...

    Started by Laura_247‎, 02-24-2011 09:48 AM
    • Replies: 5
    • Views: 21,345
    02-28-2011, 10:26 AM Go to last post
  14. [GARCH model] Why do we need a "mean equation" ?

    Hi, :) As i said in my first topic, I'm a beginner in financial statistics. I read a lot of things about GARCH, but I didn't find a precise...

    Started by Latiole‎, 08-12-2012 10:00 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 18,670
    03-03-2016, 09:11 AM Go to last post
  15. ANOVA and post-hoc analysis

    Hello there!!!! I'm struggling once again with statistics. This time I wonder if someone can advise me. I run a taste panel panel with (14...

    Started by ARI‎, 02-24-2011 11:30 AM
    • Replies: 13
    • Views: 17,802
    03-16-2011, 07:26 PM Go to last post
  16. missing data/multiple imputations

    They often talk about whether the mechanism that generates missing data is"ignorable." I don't really know what this means in practice. Also how do...

    Started by noetsi‎, 03-12-2015 01:40 PM
    8 Pages
    1 2 3 ... 8
    • Replies: 114
    • Views: 17,636
    09-30-2015, 01:09 PM Go to last post
  17. Interpreting and applying results PCA

    I have a problem with executing the methodology I use in my paper (Master thesis at the University of Amsterdam). I have the following data: - ...

    Started by bterstege‎, 04-15-2010 03:26 PM
    • Replies: 10
    • Views: 17,544
    01-31-2011, 06:42 AM Go to last post
  18. Getting same value (.000) of Sig. (or 'p') in Shapiro-Wilk Normality test

    Greetings to fellow talk stat members, I'm facing an issue with significance (or 'p') value in Shapiro-Wilk Normality test. Even after performing...

    Started by pankaj12‎, 02-20-2014 07:25 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 16,182
    02-25-2014, 08:32 AM Go to last post
  19. How to calibrate scores in credit scoring model

    Dear all, I have developed score card for a financial institute, the objective was to forecast future performance from past behavior. Credit...

    Started by Saira.Gillani‎, 06-09-2009 04:19 AM
    • Replies: 1
    • Views: 15,382
    09-12-2011, 03:50 PM Go to last post
  20. One way ANOVAs or Two way ANOVA?

    Hello... I am new here but I am hoping you all can shed some light on a question I have. I am not sure how to best analyze my data... hopefully I...

    Started by hellokitty‎, 07-06-2010 05:05 PM
    • Replies: 8
    • Views: 14,930
    07-08-2010, 10:12 AM Go to last post
  21. Before and After Statistical Significance

    Hey, I was wondering how to do before and after statistics to show significance in the aftermath of a process. The situation is that we are...

    Started by JungleMarine‎, 06-24-2010 12:00 PM
    • Replies: 3
    • Views: 14,355
    06-24-2010, 12:39 PM Go to last post
  22. Finding the Z-Score for Safety Stock Calculations

    Dear Forum, I want to calculate the safety stocks required by our company to achieve a certain service level for our customers. The basic...

    Started by Ruben‎, 03-22-2014 10:41 AM
    normal distribution, probability density, safety stocks, z score
    • Replies: 0
    • Views: 13,429
    03-22-2014, 10:41 AM Go to last post
  23. Control chart for spending over time.

    I am running a control chart for spending over time (there are about 80 data points, one per month for the last 80 months). Is there one type of...

    Started by noetsi‎, 05-05-2016 09:19 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 54
    • Views: 11,943
    05-13-2016, 11:12 AM Go to last post
  24. What do statistical tests really do

    The background. We generated customer to counselor ratios for our counties (these are population data not a survey. That is we queried all our...

    Started by noetsi‎, 03-02-2017 03:27 PM
    3 Pages
    1 2 3
    • Replies: 43
    • Views: 11,934
    04-01-2017, 11:50 PM Go to last post
  25. Standard deviation of Standard deviation

    I am working on a Monte Carlo code enhancements and for this I need to calculate the standard deviation of my result. However to compare different...

    Started by BartS‎, 09-20-2010 10:56 AM
    • Replies: 5
    • Views: 11,792
    09-23-2010, 02:50 PM Go to last post
  26. 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...

    Started by noetsi‎, 09-23-2014 10:57 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 11,521
    10-05-2014, 09:24 PM Go to last post
  27. Best Practices for Handling Skewed Data?

    Hi everyone! I'm currently working on cleaning various inputs to perform a multiple linear regression. I have no experience in applied...

    Started by Oberon‎, 08-07-2013 11:50 AM
    • Replies: 3
    • Views: 11,501
    08-08-2013, 09:23 AM Go to last post
  28. reporting of interactions and main effects

    Hi I have a general question. When you include interaction terms in a regression model together with main effects and the interaction terms are...

    Started by sk0412‎, 07-19-2010 10:03 PM
    • Replies: 1
    • Views: 11,310
    07-19-2010, 10:28 PM Go to last post
  29. European Social Survey -- income variable

    If you have worked with the ESS and are familiar with the vagaries of the income variable, perhaps you can help me identify a solution to a specific...

    Started by dbartram‎, 06-20-2013 10:45 AM
    2 Pages
    1 2
    ess
    • Replies: 15
    • Views: 10,875
    01-16-2015, 07:43 AM Go to last post
  30. Question 2-WAY ANOVA - with only means, SD & sample size

    Hello all. I hope this is the correct forum for this query - my apologies if best placed elsewhere. As part of my doctoral research I'm looking to...

    Started by chrisjames511‎, 05-21-2012 12:03 PM
    • Replies: 3
    • Views: 10,610
    05-22-2012, 04:30 AM Go to last post
  31. Hotelling's T

    The matter I see in Wikipedia on Hoteling's T is unintelligible for me. How do we calculate Hoteling's T? Some easy method, please.

    Started by Dr.Appalayya‎, 08-07-2010 10:06 PM
    • Replies: 7
    • Views: 10,559
    08-10-2010, 10:27 AM Go to last post
  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...

    Started by noetsi‎, 10-18-2013 05:38 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 10,470
    12-03-2013, 12:12 PM Go to last post
  33. Two sets of time-series data. What type of test?

    As the title suggests, my goal is to compare two sets of time-series data. This is the scenario: -Two air samplers are measuring for...

    Started by raycock‎, 06-12-2013 11:28 AM
    • Replies: 3
    • Views: 10,330
    06-12-2013, 11:13 PM Go to last post
  34. Small sample size...

    Hi, I have a small sample size of times for a specific event (no way to increase sample size at the moment...). I have only 2 times, thus running a...

    Started by Salvooch‎, 08-06-2010 03:04 PM
    • Replies: 10
    • Views: 9,751
    08-16-2010, 10:47 PM Go to last post
  35. Correlogram, Periodogram, Partial correlogram

    Hi, I am helping someone to analyze a data set . He had to make periodogram, correlogram, and partial correlogram, I made them using excel add ins...

    Started by SadieKhan‎, 07-16-2010 07:17 AM
    • Replies: 2
    • Views: 9,741
    07-17-2010, 12:10 AM Go to last post
  36. Assembly time for IKEA furniture

    Their furniture units have a number of wooden panels & pieces NP and a number of fasteners NF. If I assemble two units of furniture in times X and...

    Started by Outlier‎, 03-16-2010 07:29 PM
    • Replies: 4
    • Views: 9,726
    03-18-2010, 08:28 AM Go to last post
  37. Binary Logistic Regression: general issue and question about model fit

    Hello Guys, I would appreciate to have some feedback on an issue I am faced with. Thank you in advance for the time you will possibly spend in...

    Started by gianmarco‎, 07-10-2014 07:28 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 9,609
    07-21-2014, 12:33 PM Go to last post
  38. Method Comparison * T-test help

    Good day all, I'm developing a new method of sample preparation for a common type of analyses performed in my workplace laboratory. I've choosen...

    Started by Higgs Boson‎, 03-25-2011 09:46 AM
    • Replies: 8
    • Views: 9,368
    04-07-2011, 10:49 PM Go to last post
  39. stock market probability

    suppose i have the following probabilities of making a profitable stock trade: day 1: 2/3 day 2: 2/3 day 3: 2/2 day 4: 3/4 day 5: 0/2 how...

    Started by medc‎, 02-25-2009 04:06 PM
    • Replies: 9
    • Views: 9,317
    01-31-2013, 10:33 AM Go to last post
  40. Adequate sample size determination, p-charts

    I am measuring defects vs. encounters of a software application in a healthcare setting, and during an analysis encountered 1 defect in 14000...

    Started by cinger‎, 09-28-2011 08:23 PM
    • Replies: 5
    • Views: 9,288
    10-05-2011, 08:04 PM Go to last post
  41. 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...

    Started by noetsi‎, 10-31-2013 10:27 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 9,240
    12-03-2013, 12:25 PM Go to last post
  42. A textbook of Time Series Analysis

    I obtained a Bachelor Degree in Statistics in 1988. I was separated form this profession for more than 17 years because I was exercising Information...

    Started by davidbinyam‎, 05-13-2008 10:41 PM
    • Replies: 8
    • Views: 9,237
    05-16-2008, 02:58 PM Go to last post
  43. how to calculate a sample size, when comparing two proportions

    I am doing a research proposal as coursework for uni and have to calculate a sample size. I have used russlenth's sample size calculator but have no...

    Started by pipparielly‎, 03-17-2011 03:32 PM
    • Replies: 10
    • Views: 9,159
    03-18-2011, 10:11 AM Go to last post
  44. Thumbs down Regress Prices or Returns?

    Hey there, I've just started a new job and have been asked to take a look at the historical correlation of the spot gold price with the spot...

    Started by John Rormark‎, 11-10-2009 11:44 PM
    • Replies: 1
    • Views: 9,122
    11-11-2009, 01:07 AM Go to last post
  45. Random numbers from normal distribution with given mean, st dev, Min, and Max

    Hi All !!! I would appreciate to have hints of the following issue. I was wondering how to get random values from a normal distribution with a...

    Started by gianmarco‎, 01-30-2013 03:33 AM
    • Replies: 5
    • Views: 9,111
    01-30-2013, 11:09 AM Go to last post
  46. Correlation for non-random data

    Hi I have searched the forum with little luck, so apologies if the answers are blindingly obvious! I am analysing data collected two years ago....

    Started by owl99‎, 10-31-2010 08:13 AM
    • Replies: 7
    • Views: 8,955
    11-01-2010, 05:14 AM Go to last post
  47. comparing LogLog model and Linear model

    Hi everybody, Supposing we have the 2 following models: 1) log(y) = 5a + 3b + 4c + 2log(d) 2) y = 5a + 3b + 4c + 2d How can I compare these...

    Started by basouille‎, 03-19-2011 01:30 PM
    • Replies: 5
    • Views: 8,937
    03-20-2011, 10:38 AM Go to last post
  48. Missing data in regression

    I have an entire population. One of the variable is missing about 12 percent of the data. I believe this is because we have no finished collecting...

    Started by noetsi‎, 09-27-2016 02:55 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 8,905
    10-05-2016, 08:57 AM Go to last post
  49. Question Overlapping Normal distributions

    Hi all, I am trying to find formulae for calculating the overlap between two normally distributed populations. There are some online calculators...

    Started by Robbyod‎, 07-19-2010 06:52 AM
    • Replies: 2
    • Views: 8,863
    07-19-2010, 10:15 AM Go to last post
  50. Simulations

    I mean this to be a general thread on simulation but will start with a specific point. The following I know is a trivial example, CI are well...

    Started by noetsi‎, 01-05-2015 02:10 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 8,849
    01-09-2015, 03:36 PM Go to last post
  51. Homework help

    I am in serious need of help when it comes to statistics. I am currently in a statistics course that is a prerequisite, and I have no desire to...

    Started by drivinglesson‎, 12-09-2010 07:53 PM
    • Replies: 8
    • Views: 8,814
    12-09-2010, 08:44 PM Go to last post
  52. financial return/coefficient of variation

    I am moving this question to this forum from the general statistics one because I just realized this forum covers finance. I would greatly...

    Started by ealeql‎, 02-26-2010 07:21 PM
    • Replies: 2
    • Views: 8,647
    06-16-2010, 03:07 PM Go to last post
  53. skewness/kurtosis

    Hello How can I determine what the accepted range of Kurtosis and skewness in my data is. I found a formulum in a book, but I can not apply it. It...

    Started by mohsenn‎, 10-16-2010 05:15 AM
    • Replies: 4
    • Views: 8,566
    10-16-2010, 09:11 PM Go to last post
  54. LDA vs Cluster Analysis

    Hi Guys, I have a basic question... If I have a dataset, containing many variables, and based on that, I want to be able to divide...

    Started by WeeG‎, 05-01-2011 02:36 AM
    • Replies: 4
    • Views: 8,499
    05-11-2011, 10:16 PM Go to last post
  55. Monte Carlo simulations

    I am not using this to test the results of violations of statistical assumptions or the like. I am using it to analyze business issues for which no...

    Started by noetsi‎, 02-10-2017 04:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,440
    02-22-2017, 03:15 PM Go to last post
  56. When is the difference between various AIC/BIC enough to matter?

    It is commonly recommended you use BIC or AIC to choose between models (lower is better). Say you use AIC. Then how far apart between two AIC models...

    Started by noetsi‎, 03-31-2014 12:45 PM
    • Replies: 11
    • Views: 8,328
    03-31-2014, 03:33 PM Go to last post
  57. 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: 8,311
    11-04-2011, 03:51 PM Go to last post
  58. How to WEIGHT the adjusted Fisher–Pearson standardized moment coefficient (skewness).

    Hello, I'm using the adjusted Fisher–Pearson standardized moment coefficient formula to calculate the skew of some sample data (it's the same...

    Started by Multiplex‎, 06-20-2015 01:22 PM
    fisher–pearson, skewness, weight
    • Replies: 2
    • Views: 8,205
    06-29-2015, 03:11 PM Go to last post
  59. Exact p-value conflict with exact 95% confidence interval

    Dear all, How would you interpret a situation where Pearson's exact p-value is 0.01, but the exact confidence interval for the risk ratio embraces...

    Started by Deebles‎, 06-25-2010 06:08 AM
    • Replies: 6
    • Views: 8,089
    06-28-2010, 05:43 AM Go to last post
  60. Satterthwaite df in t-test

    Hello all: I just received a reference text in quality control – Statistical Quality Control by Montgomery 6ed. In describing the (2 sample unequal...

    Started by oldschoolcarto‎, 01-17-2011 05:03 PM
    • Replies: 0
    • Views: 7,930
    01-17-2011, 05:03 PM Go to last post

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