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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,899
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,823
    09-30-2005, 09:44 AM Go to last post
  1. Assumptions of ANOVA

    I would like to better understand why the same variance is for each group is an assumption in the ANOVA. Can anyone explain this? Further it is...

    Started by Tony123‎, 03-28-2015 09:22 AM
    • Replies: 4
    • Views: 1,462
    03-29-2015, 06:59 AM Go to last post
  2. Assumptions of linearity for parametric tests?

    Do parametric tests make assumptions regarding linearity? Whether yes or no, how can I explain this? It seems to me as though regression analyses...

    Started by searchtobefound‎, 12-13-2016 10:56 PM
    assumptions, linearity, parametric, regression
    • Replies: 1
    • Views: 2,594
    12-14-2016, 12:38 AM Go to last post
  3. Thumbs up Assumptions of t-test

    Just a quick question (hopefully). Can I use a between-groups t-test (assuming unequal variances) if one of the two groups I'm comparing (but not the...

    Started by benambridge‎, 10-02-2006 06:51 AM
    • Replies: 1
    • Views: 3,292
    10-02-2006, 05:34 PM Go to last post
  4. Question Asymmetric (skewed) Data and Mean

    Hello, I have a bunch of sample data of the form: -0.90,.-0.89,-0.35,-0.55, .... +9.96 ie. 9 out of 10 data points are small negatives and the...

    Started by Adam‎, 07-12-2007 11:51 AM
    • Replies: 1
    • Views: 3,832
    07-12-2007, 11:56 AM Go to last post
  5. Asymmetric CI formula

    Hi...Does anyone know the asymmetric CI formula for small proportions?? If you do and you want to share it with me, that would be FANTASTIC!!!...

    Started by mccormsa‎, 12-02-2008 12:33 PM
    • Replies: 0
    • Views: 2,399
    12-02-2008, 12:33 PM Go to last post
  6. Asymmetric Multivariate Regression?

    Hi all, For asymmetric non-linear multi-variate cases what are some known methods to look at? I'm partial to WEKA and R and MatLab but am...

    Started by Axl‎, 05-27-2010 11:53 PM
    • Replies: 0
    • Views: 3,464
    05-27-2010, 11:53 PM Go to last post
  7. Asymptotes

    can anybody explain what is aysmptotes in statistics???

    Started by R Subbhashree‎, 02-22-2014 10:37 AM
    • Replies: 1
    • Views: 1,213
    02-22-2014, 12:08 PM Go to last post
  8. Asymptotic

    Good afternoon, I write to You for 1 question. It would be very nice from You to give me a short response. Most of the statistical techniques...

    Started by figone‎, 01-19-2014 03:56 PM
    asymptotics
    • Replies: 5
    • Views: 1,751
    01-21-2014, 05:57 PM Go to last post
  9. asymptotic normality OLS

    Hi there, I have a question concerning asymptotic normality of OLS. Suppose the simple scenario of linear regression with one covariate. We...

    Started by leo nidas‎, 03-29-2010 07:01 AM
    • Replies: 0
    • Views: 2,986
    03-29-2010, 07:01 AM Go to last post
  10. Asymptotic Variance

    Hi Can anyone help me out with asymptotic variance. What is it? Why it is used? Where it is used? Regards Fahad

    Started by fahdnoor‎, 08-27-2008 03:11 PM
    • Replies: 0
    • Views: 2,058
    08-27-2008, 03:11 PM Go to last post
  11. Asymptotic Variance of a Maximum Likelihood Estimator

    A population follows the Pareto distribution defined as f(x|x_0,\theta)=\theta x_0^\theta x^{-\theta-1},\quad x\geq x_0,\quad\theta>1. Assume...

    Started by Kiuhnm‎, 04-28-2013 10:31 AM
    • Replies: 2
    • Views: 2,321
    04-28-2013, 01:32 PM Go to last post
  12. Question Asymptotically unbiased & consistent estimators

    Theorem: If "θ hat" is an unbiased estimator for θ AND Var(θ hat)->0 as n->∞, then it is a consistent estimator of θ. The textbook proved this...

    Started by kingwinner‎, 07-08-2011 04:28 AM
    • Replies: 3
    • Views: 6,117
    07-08-2011, 04:21 PM Go to last post
  13. At a loss! Unequal variance, unequal sample sizes and ordinal DV!

    I have been searching for hours for a solution to this problem but I can't find an answer. I am hoping someone can point me in the right direction. ...

    Started by marika‎, 09-22-2012 02:41 PM
    • Replies: 3
    • Views: 2,484
    09-23-2012, 01:21 PM Go to last post
  14. At the 1% level of significance, give the associated critical value

    A Chip Company claims that there is 32 oz in every bag of chips with a specified population standard deviation of 1.5. A sample of 40 bags where...

    Started by kapi1‎, 04-06-2012 02:59 PM
    • Replies: 1
    • Views: 6,279
    04-07-2012, 10:07 AM Go to last post
  15. At what value of correlation can I say two values are correlated? (academic ref)

    So I'm doing some regression tests but before I do the regression tests I am performing correlation analysis and removing variables that are very...

    Started by david_q‎, 02-19-2012 05:06 PM
    • Replies: 11
    • Views: 3,660
    02-20-2012, 07:46 AM Go to last post
  16. Attacks

    Hello, This is my first post, so I will give a little background about myself. I am a business analyst who is familiar with general mathematics...

    Started by Justin In Oz‎, 01-28-2010 12:08 AM
    • Replies: 1
    • Views: 1,829
    02-01-2010, 01:46 AM Go to last post
  17. ATTENTION and EYE-BLINKS valuables. How do I enter them?

    I have collected attention and eye blinking data from 5 different patients which were tested for 2 minutes. My hypothesis is that the attention...

    Started by periklis88‎, 06-12-2014 10:10 AM
    • Replies: 0
    • Views: 1,426
    06-12-2014, 10:10 AM Go to last post
  18. Attribute Sampling in Batch Production

    Very basic question: If I have a batch of 130 parts and I randomly sample inspect 14 parts, either accept or reject the part, and calculate the...

    Started by JimEpp‎, 01-17-2014 11:27 AM
    attribute sampling
    • Replies: 0
    • Views: 776
    01-17-2014, 11:27 AM Go to last post
  19. Attrition Rules-of-Thumb

    Hi, I am looking for some rules-of-thumb regarding rates of attrition and the percentage that is considered "too much". I would appreciate any...

    Started by ceperras‎, 11-27-2007 08:30 PM
    • Replies: 0
    • Views: 3,511
    11-27-2007, 08:30 PM Go to last post
  20. AUC of 2 ROCs significantly different with SPSS?

    Hello everyone, I am trying to determine whether the Area under the curve of two ROCs are significantly different, and I find all of these very...

    Started by bergier‎, 10-20-2008 02:30 PM
    • Replies: 0
    • Views: 4,770
    10-20-2008, 02:30 PM Go to last post
  21. Audit Random Sample Size

    Hi all Iím having some difficulty with some sampling work. Iíve searched around for a few days but need a little help. Hopefully someone here will...

    Started by George22‎, 01-10-2011 09:21 AM
    audit sampling, random sampling
    • Replies: 0
    • Views: 3,612
    01-10-2011, 09:21 AM Go to last post
  22. Exclamation Augmented Dickey Fuller Test

    Hi people. I'm sorry if this is a silly question. These are the results of ADF test on the daily returns of an index. Could you please help me help...

    Started by Yash‎, 01-25-2012 06:10 PM
    dickey fuller augmented
    • Replies: 0
    • Views: 2,473
    01-25-2012, 06:10 PM Go to last post
  23. Augmented Dickey Fuller Test

    has been solved...

    Started by cze‎, 05-20-2013 12:05 PM
    • Replies: 0
    • Views: 857
    05-20-2013, 12:05 PM Go to last post
  24. Auto corelation

    hi, i want to know where and why auto corelation can be used. can someone help me in understanding autocorelation with example. what inference can...

    Started by thisisrahul‎, 09-25-2008 12:55 AM
    • Replies: 0
    • Views: 2,707
    09-25-2008, 12:55 AM Go to last post
  25. auto correlation plot- tool

    Hi all, Does any one know any tool or any sample in excel for partial autocorrelation plot. here is the sample of partial autocorrelation...

    Started by miaw650‎, 04-15-2013 01:24 PM
    • Replies: 0
    • Views: 1,441
    04-15-2013, 01:24 PM Go to last post
  26. auto-regressive and polynomial models

    Hi, I am not a statistician and I want to use the pure auto-regressive (AR) model and/or the polynomial model to solve a prediction problem. I...

    Started by nahla‎, 06-08-2013 08:41 AM
    • Replies: 0
    • Views: 779
    06-08-2013, 08:41 AM Go to last post
  27. Autocorrelated from interpreting correlogram

    Hi, I'm new to statistic, and i've searched correlogram in this from but it doesn't help my case. So please help me with this. I have this...

    Started by ngocdiep1510‎, 01-03-2014 03:38 AM
    • Replies: 0
    • Views: 1,138
    01-03-2014, 03:38 AM Go to last post
  28. Autocorrelation

    Hi! I wonder if someone could explain what is ment by autocorrelation? Will autocorrelation be a problem in regression analysis of securities...

    Started by umbstudent‎, 11-20-2010 12:02 PM
    • Replies: 0
    • Views: 3,580
    11-20-2010, 12:02 PM Go to last post
  29. Autocorrelation

    When error terms are autocorrelated a. their means are necessarily different than zero. b. estimated coefficients are biased c. estimated...

    Started by aycanada‎, 08-31-2011 02:28 PM
    • Replies: 4
    • Views: 3,903
    08-31-2011, 03:04 PM Go to last post
  30. Autocorrelation

    Does anyone the effect of serial correlation caused by seasonal effect to standard error of if I have a seasonal effect in both your dependent and...

    Started by ardinea‎, 09-06-2012 06:57 PM
    • Replies: 2
    • Views: 1,587
    09-09-2012, 05:55 AM Go to last post
  31. Autocorrelation

    Yt = B0 + B1X1 + et was fit to a time-series data set using OLS. The residuals e^1, ..., e^n from the fit were then used ot create two new...

    Started by simplemts‎, 07-21-2013 05:25 PM
    • Replies: 1
    • Views: 1,008
    07-21-2013, 08:21 PM Go to last post
  32. Autocorrelation - Need to difference?

    I have data of precipitation over a month and want to make a forecast with an ARIMA-model. My data is presented hourly every day over this month. So...

    Started by nimbus224‎, 04-22-2012 02:16 PM
    • Replies: 0
    • Views: 1,239
    04-22-2012, 02:16 PM Go to last post
  33. Question Autocorrelation and comparing means......

    Hi All, I might be totally missing a key point here - or making a mountain out of a molehill, but I have been reading around and trying to find the...

    Started by Ally30‎, 04-07-2012 06:01 AM
    anova, autocorellation, dependence., non-parametric
    • Replies: 1
    • Views: 2,186
    04-07-2012, 09:05 AM Go to last post
  34. Question Autocorrelation for Normal data only?

    Hi there, I recently read part of Automatic autocorrelation and spectral analysis and he suggests that autocorrelation "represents all there is...

    Started by Pooven‎, 12-21-2010 08:06 AM
    • Replies: 2
    • Views: 2,950
    12-22-2010, 04:02 PM Go to last post
  35. Question Autocorrelation Function: How to interpret an acf plot?

    Hi there, I'm trying to understand how to interpret an autocorrelation function plot. I've been trying to find resources that explain how they are...

    Started by Pooven‎, 05-31-2011 06:07 AM
    acf, autocorrelation function, interpret acf, plot
    • Replies: 0
    • Views: 26,258
    05-31-2011, 06:07 AM Go to last post
  36. Autocorrelation help

    Hi there. I'm working on a project and I'm stuck on computing an autocorellation function. So I have daily returns for a single stock and have...

    Started by c2q‎, 02-24-2012 08:58 PM
    • Replies: 1
    • Views: 1,784
    02-25-2012, 06:56 AM Go to last post
  37. Autocorrelation in the residuals

    I understand what autocorrelation is and I understand what the residuals are, but what are the implications of having autocorrelated residuals? Does...

    Started by Filco‎, 05-29-2011 10:06 PM
    • Replies: 3
    • Views: 7,510
    06-11-2011, 01:22 AM Go to last post
  38. Autocorrelation of discrete time series

    I am currently planning on calculating the autocorrelation for various lags given a time series. However, my elements of the time series are...

    Started by killver‎, 06-02-2014 04:35 AM
    autocorrelation, pearson, time series
    • Replies: 0
    • Views: 783
    06-02-2014, 04:35 AM Go to last post
  39. Autocorrelation question

    I have a panel data set with microdata (census of a country) which is as follows. company_id | productivity | year-dummys | many differenent...

    Started by Mr.Stochastic‎, 04-25-2010 01:34 PM
    • Replies: 0
    • Views: 2,583
    04-25-2010, 01:34 PM Go to last post
  40. Autocorrelation with S-Plus

    Hi, I have a series of data organized by location (x) and test value (y). I want to make an autocorrelation function for those data using S-Plus. Is...

    Started by Faraz‎, 01-15-2009 11:05 PM
    • Replies: 2
    • Views: 3,605
    01-23-2009, 10:33 PM Go to last post
  41. Autocovariance Function

    Hey there! I have a question relating to Applied Time Series that I'm having a bit of trouble with. For all parts of this question, let Z_t; t...

    Started by panderson‎, 08-06-2013 11:17 PM
    autocovariance, stationarity, time series
    • Replies: 3
    • Views: 1,517
    08-07-2013, 06:43 AM Go to last post
  42. autoregression, autocorrelation

    Hi, I am estimating the following regression which contains lagged dependent variables and lagged indepedent variables and I am worried about the...

    Started by sun‎, 05-16-2007 11:35 AM
    • Replies: 0
    • Views: 3,078
    05-16-2007, 11:35 AM Go to last post
  43. Average

    Hi, I have some diary data (Day1, Day2, Day3, Day4, Day5). If I am trying to calculate Average-Days and, for example, Day3 is missing...do I...

    Started by ceperras‎, 04-16-2007 11:25 AM
    • Replies: 4
    • Views: 2,527
    04-18-2007, 07:38 AM Go to last post
  44. Average

    Hi... I have an average rainfall,minimum and maximum temperature data.so can I find average value of this three variable?Is it meaningful? ...

    Started by Poonam‎, 02-20-2013 03:42 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,112
    02-21-2013, 02:25 AM Go to last post
  45. average and SD for averge values with SD

    Hi guys, Hope I could find my answer here, since I've been trying to figure it out for quite sometime... Lets say that I am measuring the...

    Started by snadav‎, 01-25-2016 02:27 PM
    • Replies: 1
    • Views: 944
    01-30-2016, 03:27 AM Go to last post
  46. Average based on Factor Analysis loadins

    I am interested in creating a new variable that is made up of the factors suggested from a Factor Analysis. However, the factor is made up of both...

    Started by lil-Peeks‎, 01-14-2015 07:22 AM
    • Replies: 1
    • Views: 2,303
    01-14-2015, 11:30 AM Go to last post
  47. Average car price

    The average car prices for cars sold in a country are: COLOUR: Red: £14,000 Blue: £12,000 ENGINE SIZE: 1.5 litre: £12,000 2 litre: £16,000

    Started by mr e guest‎, 07-02-2015 10:56 AM
    • Replies: 2
    • Views: 1,243
    07-03-2015, 04:25 AM Go to last post
  48. Question Average delay

    Dear All, i have a problem with calculate a statistics value. So, consider we have two classes,: class A, class B. every classes have 10 values....

    Started by khoubeil‎, 05-07-2016 06:29 AM
    average delay, nan value, statistics
    • Replies: 0
    • Views: 1,298
    05-07-2016, 06:29 AM Go to last post
  49. Average distance of the dart (Dartboard)

    Hello I have been struggling with this questions for some time now and I have no idea how to start it. Can you guys give me some tips? "A large...

    Started by elektrokalle‎, 11-08-2015 01:53 PM
    dartboard, gaussian, random variable, statistic
    • Replies: 3
    • Views: 2,306
    11-10-2015, 04:18 AM Go to last post
  50. Lightbulb Average from uneven ranges

    I'm trying to work out how to work out an average from an uneven set of ranges and I can't for the life of me remember how to do it. If someone can...

    Started by Tranka Verrane‎, 09-08-2009 07:57 PM
    • Replies: 1
    • Views: 2,990
    09-08-2009, 08:33 PM Go to last post
  51. Average Hours

    We have the following data and we need to find average hours it takes to complete one item in CNC Item Quantity HOurs Applied Dept A 1 ...

    Started by agovindasamy‎, 06-08-2007 11:33 AM
    • Replies: 3
    • Views: 3,211
    06-14-2007, 10:51 AM Go to last post
  52. Average of Averages?

    This is as much a philosphical question as it is a stats question. I am analyzing some cleaning evolutions. Each cleaning evolution has a final cost....

    Started by MrGibbage‎, 12-29-2011 12:52 PM
    • Replies: 1
    • Views: 7,623
    12-29-2011, 04:01 PM Go to last post
  53. Question Average of grading in relation to total sample size

    Hello all, Lets say I'm grading translation quality of 2 different translators, and want to see their average performances. Below is the current...

    Started by e.sezen‎, 01-13-2015 09:20 AM
    • Replies: 2
    • Views: 1,404
    01-13-2015, 09:37 AM Go to last post
  54. average of percentages

    I'm looking for a way to guage performance of website referrals over many websites. I'm not sure the number of referrals for a particular website is...

    Started by alanv‎, 10-14-2010 10:50 AM
    • Replies: 1
    • Views: 4,155
    10-14-2010, 03:14 PM Go to last post
  55. Average of sample means

    If random samples, each with n=100 scores, are selected from a normal population with mu=1000 and standard deviation=50, and the mean is calculate...

    Started by starfish794‎, 11-12-2006 02:57 PM
    • Replies: 1
    • Views: 3,358
    11-13-2006, 12:39 AM Go to last post
  56. Average of Standard Deviation?

    I am hoping this is an easy one. I have employees that work at different stores on different days of the week. My employees have different start...

    Started by GustoTangerine‎, 09-28-2006 09:05 AM
    • Replies: 1
    • Views: 3,580
    09-29-2006, 10:11 AM Go to last post
  57. average of standard deviations

    Hello, I am computing "daily volatility" as the standard deviation of periodic intraday returns. To compute "monthly volatility", can I just...

    Started by saminny‎, 06-15-2008 08:28 PM
    • Replies: 0
    • Views: 5,882
    06-15-2008, 08:28 PM Go to last post
  58. average of two means from the same data?

    I've been given two means from the same data set (split into people who said yes and no) from this i have to find the mean of the total of the data....

    Started by twitchy‎, 09-30-2006 02:05 AM
    • Replies: 2
    • Views: 10,140
    10-01-2006, 08:19 AM Go to last post
  59. average p values???

    I have to compare demographics of a study that was s . In the "pre" group, I have 385 patients, in the post...

    Started by crisisinmedicine‎, 08-29-2013 03:29 PM
    average, chi sq test, chisq, pvalue, stats
    • Replies: 3
    • Views: 2,983
    08-29-2013, 06:06 PM Go to last post
  60. Average Percent Change

    When finding the average percent change of different data points in time, should I average the points together first and then find the percent change...

    Started by chanman876‎, 02-22-2015 02:03 PM
    percent change
    • Replies: 1
    • Views: 1,311
    02-22-2015, 09:24 PM Go to last post

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