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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: 197,043
    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: 66,898
    09-30-2005, 09:44 AM Go to last post
  1. What is Orthogonal contrast?

    Whats the difference between your regular contrast and orthogonal contrast? Google search gives me to research papers that are beyond me. My notes...

    Started by taepodong1101‎, 04-14-2009 06:07 AM
    • Replies: 2
    • Views: 31,309
    07-16-2012, 11:21 PM Go to last post
  2. H0: μ≥18.1 ,H1: μ<18.1, x̄ = 16.8 , s = 4.7?

    Given that level of significance is 0.1, how do I A)find sample size( not sure if i need to find this but i think i do,im really confused on how...

    Started by alvinhwang63‎, 07-21-2010 03:31 AM
    • Replies: 1
    • Views: 31,233
    07-21-2010, 03:28 PM Go to last post
  3. Variance of product of two random variables

    Hi, I want to find the variance of the product of two random variables normally distributed with common mean and variance. X, Y normally...

    Started by PeterVincent‎, 10-03-2008 04:45 AM
    • Replies: 2
    • Views: 30,958
    10-04-2008, 06:04 AM Go to last post
  4. Finding a P-value

    The questions: Use technology to find the P-value for a right-tailed test with n=26 and test statistic t=1.219 Use technology to find the...

    Started by bluehorseshoe33‎, 08-11-2008 03:25 PM
    • Replies: 3
    • Views: 30,955
    08-11-2008, 09:53 PM Go to last post
  5. Why regression estimate for dummy coded variable exceeds “1”?

    Hi, I’m puzzled about interpreting one category of a multinomial regression analysis which shows “male” with an estimate of 1.47. I don’t...

    Started by elle-mnop‎, 02-01-2012 06:50 AM
    • Replies: 4
    • Views: 30,606
    02-02-2012, 02:48 PM Go to last post
  6. Factor Analysis/Prinicpal Component Analysis: Reporting to APA Style

    Hello All, Desperate for help! I've performed a principal component analysis on a pilot study of a questionnaire I created. I have removed poor...

    Started by AdamC‎, 02-09-2008 06:11 AM
    • Replies: 1
    • Views: 30,557
    02-12-2008, 03:16 PM Go to last post
  7. Bêta and Alpha ...

    Hi, I'm reading a paper and I find this in the Statistical Analyses section: Before initiating the study, a sample size was calculated...

    Started by viwel‎, 02-12-2009 12:57 PM
    • Replies: 1
    • Views: 30,408
    02-12-2009, 01:26 PM Go to last post
  8. Reporting results of Tukey-Kramer posthoc test

    My question is probably not the typical query this forum receives, but hopefully there are some researchers on here who can help me. I actually...

    Started by GrungyGoose‎, 02-05-2011 01:31 AM
    results, tukey-kramer, writing
    • Replies: 3
    • Views: 30,351
    02-07-2011, 05:08 PM Go to last post
  9. Questions about Tukey's HSD/Scheffe Test

    I heard Tukey Test can be used for unequal sample sizes. My assumption is that you must use some kind of weighted average of n for all groups....

    Started by this_barb‎, 05-06-2008 02:55 PM
    • Replies: 7
    • Views: 30,255
    05-12-2008, 06:14 PM Go to last post
  10. Question t-Test, P-Value of 0?

    Hello All, I'm doing a paired t-test with a data set close to 1300. We're looking at pain scales from before and after treatment. When I run the...

    Started by MHoffman‎, 03-30-2010 08:25 AM
    • Replies: 3
    • Views: 30,246
    04-23-2012, 06:05 AM Go to last post
  11. Smile Kurtosis - Example to calculate, Help Please!

    Ok, hope people have PATIENCE with me here...I am doing some stat calculations, but I am NOT a statistician, so please bear with me. Please don't...

    Started by jimc52‎, 08-07-2007 01:39 PM
    • Replies: 5
    • Views: 30,214
    01-03-2013, 01:25 PM Go to last post
  12. Z-score for Skewness and Kurtosis

    Hi, I have a sample of data (about a hundred numbers) and I would like to roughly estimate whether they follow a normal distribution or not. From...

    Started by Bruno‎, 08-09-2006 06:48 AM
    • Replies: 3
    • Views: 30,207
    08-10-2006, 11:46 PM Go to last post
  13. Fisher's Exact test in SPSS - help please?

    Dear All, I am currently trying to do Fisher's exact tests on SPSS V20 as I had been advised this is correct test to undertake. What I am trying...

    Started by bowerpower83‎, 05-28-2012 04:50 PM
    • Replies: 3
    • Views: 29,800
    05-30-2012, 03:37 PM Go to last post
  14. Decile equation?

    Hello, I'm currently enrolled in Stats at the local university. Our book doesn't really do a good job at explaining how to figure Deciles, other...

    Started by desmoface‎, 09-10-2008 01:19 PM
    • Replies: 5
    • Views: 29,238
    09-10-2008, 10:49 PM Go to last post
  15. Building a QQ plot manually in excel

    Dear All, I have the following information: Observations *** Frequency YYY Cum Freq ZZZ Expected Cum Freq ??? (Total...

    Started by KDP‎, 08-13-2009 07:23 AM
    • Replies: 1
    • Views: 29,237
    08-13-2009, 11:04 AM Go to last post
  16. age is scale data in spss BUT what if the ages are grouped??? is it then ordinal?

    Hi, I know that age is a scale measurement in spss but if i have ages that are groupef for example; 1= <20 2=21-30 3=31-40 4= > 40 is...

    Started by mimestra‎, 03-27-2011 03:07 AM
    • Replies: 1
    • Views: 28,989
    03-27-2011, 08:34 AM Go to last post
  17. Identifying outliers in non-normally distributed data

    Hello, I've been searching for a method for identify outliers for quite some time now. The complication is that I cannot assume that my data is...

    Started by Isac3‎, 12-27-2009 08:37 AM
    • Replies: 4
    • Views: 28,966
    12-27-2009, 04:54 PM Go to last post
  18. Lightbulb Least Significant Difference, Calculate in Excel?

    Anyone know how to figure out this enigma? I've looked at formulas for Least Significant Difference (LSD), and I can't seem to figure out how to...

    Started by hanyhany‎, 03-13-2008 07:14 PM
    • Replies: 0
    • Views: 28,927
    03-13-2008, 07:14 PM Go to last post
  19. Are chi squred tests always 1-tailed or 2 tailed?

    Suppose we wanted to test whether 2 categorical variables are related as folllows: H0: The two variables are not related HA: The two variables ARE...

    Started by FluffyPuff‎, 11-08-2010 04:29 PM
    • Replies: 4
    • Views: 28,892
    11-11-2010, 07:35 PM Go to last post
  20. Standard deviation with only a mean and a percentage value.

    I ask alot of questions on here and I hope not to annoy. Since my questions deal with obscure problems hopefully it will make it so others don't have...

    Started by BaalHacks‎, 02-21-2011 05:28 PM
    • Replies: 5
    • Views: 28,827
    06-06-2012, 11:58 AM Go to last post
  21. Making sense of Chi-square and Cramer's V

    I read a lot about chi-square tests that do not ever talk about Cramer's V (or comparable stat), but if I'm understanding correctly, it seems like a...

    Started by jawon‎, 05-27-2009 04:50 PM
    • Replies: 1
    • Views: 28,825
    05-27-2009, 09:04 PM Go to last post
  22. Comparing two values for significance

    Looking for a little assistance please. I need to determine whether or not there is a statistical significant difference (p<0.05, with CI of 95%)...

    Started by radycardia‎, 01-05-2010 12:56 PM
    • Replies: 4
    • Views: 28,786
    03-14-2010, 01:19 PM Go to last post
  23. Goodness of Fit , R squared or Chi squared?

    Hello all, Having a bit of difficulty understanding when to use or which to use to give a quantative analysis for a goodness of fit measure on...

    Started by TheDuck‎, 11-17-2010 08:20 AM
    • Replies: 2
    • Views: 28,740
    11-17-2010, 02:21 PM Go to last post
  24. Difference between within-subjects effects, and within-subjects contrasts?

    I've run a repeated measures ANOVA of some data, looking at the change in an outcome measure in 10 subjects outcome over time. SPSS tells me that...

    Started by echolalia‎, 10-03-2008 01:08 AM
    • Replies: 3
    • Views: 28,649
    10-08-2008, 01:38 PM Go to last post
  25. Confidence interval for median

    The question is: A traffic warden notes the time cars have been illegally parked after their metered time has expired. For 16 offending cars...

    Started by winds‎, 09-10-2010 07:00 PM
    • Replies: 9
    • Views: 28,614
    10-12-2010, 09:58 AM Go to last post
  26. Find the P-value for the indicated hypothesis test.

    A medical school claims that more than 28% of its students plan to go into general practice. It is found that among a random sample of 130 of the...

    Started by combat75‎, 09-23-2007 02:50 PM
    • Replies: 0
    • Views: 28,594
    09-23-2007, 02:50 PM Go to last post
  27. Kruskal-Wallis and multiple comparisons

    Hello all, I've run a Kruskal-Wallis analysis (in SAS) and found there is a significant difference between the groups. Therefore, I would like to...

    Started by ceperras‎, 06-01-2009 05:38 PM
    • Replies: 4
    • Views: 28,581
    06-02-2009, 11:56 PM Go to last post
  28. Normal Distribution Overlap

    Is there a way that I can calculate the probability that a data point would fall in the region where two normal distributions with different means...

    Started by boilers38‎, 06-24-2010 01:44 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 28,354
    07-18-2017, 02:24 AM Go to last post
  29. Dealing with lots of zeros

    Hello all - I am a stats amateur so please go easy! I am looking at catch per unit effort data of different species of sharks across seasons...

    Started by eddbrooks‎, 07-02-2009 05:08 PM
    • Replies: 9
    • Views: 28,193
    07-06-2009, 03:49 PM Go to last post
  30. Factor Analysis-Why Rotation Failed?

    Hello, I try to perform factor analysis using SPSS, varimax. But the Rotation failed and come up this message: "Rotation failed to converge in...

    Started by wei6722‎, 03-22-2012 01:56 AM
    factor analysis, ratation, varimax
    • Replies: 3
    • Views: 27,964
    03-22-2012, 01:36 PM Go to last post
  31. Chi Squared for Ordinal level Data ??

    Hi all Please could someone explain to me in what circumstances you can use Chi squared with ORDINAL level data? I have collected data which...

    Started by Pippy‎, 08-17-2012 07:59 AM
    • Replies: 6
    • Views: 27,319
    08-24-2012, 02:11 AM Go to last post
  32. Calculate the exact P-Value for an F-Test by hand

    Does anyone know the algorithm, formula, or procedure to calculate the exact p-value for an F-test by hand? I already know how to find out what...

    Started by AMGGWB‎, 09-07-2011 09:01 PM
    p-value for f-test
    • Replies: 2
    • Views: 27,142
    09-07-2011, 09:38 PM Go to last post
  33. Best fit, standard deviation, and R2

    Hi, I am wondering if someone can help me with a fairly basic question. I am looking at whether power, linear, or exponential curves fit a set of...

    Started by Rockprincess‎, 02-19-2013 02:17 PM
    • Replies: 3
    • Views: 27,117
    02-19-2013, 03:11 PM Go to last post
  34. Repeated measures design, DF or n - 1 or n - 2

    I know that, for an independent measures design the df is n - 2. But what about for a repeated measures design? I am guessing n - 1 but not exactly...

    Started by Deganveran‎, 03-16-2010 10:47 PM
    • Replies: 3
    • Views: 27,025
    03-17-2010, 12:52 PM Go to last post
  35. (Binominal proportions) confidence interval – which formula to use?

    Hey, I got a quick question regarding confidence intervals. For a Rasch analysis I have to perform independent t-tests (it’s done to check for...

    Started by Tool7‎, 11-09-2012 04:59 AM
    confidence interval
    • Replies: 2
    • Views: 26,902
    11-12-2012, 06:30 AM Go to last post
  36. Standard error of the sample standard deviation

    Hi, all Does anyone let me know the formula for "the standard error of the sample standard deviation" when no specific distribution is assumed for...

    Started by Taqman‎, 06-09-2010 08:33 AM
    • Replies: 5
    • Views: 26,781
    06-10-2010, 08:50 PM Go to last post
  37. converting standard error (regression coefficient) to standard deviation.

    Hi guys, I have a regression output where I'm given the standard error of both the intercept and the gradient (X co-efficient). I'm required to...

    Started by imiyakawa‎, 10-28-2010 03:16 PM
    • Replies: 5
    • Views: 26,640
    10-28-2010, 06:04 PM Go to last post
  38. Prove var(s^2) = 2sigma^4/(n-1)

    I am trying to prove var(s^2) = 2sigma^4/(n-1) for N(u, sigma^2) where S^2= sumof(xi-xbar)^2/(n-1) I tried var(s^2) = E - E^2 I have already...

    Started by gh33‎, 02-01-2011 01:09 AM
    • Replies: 5
    • Views: 26,315
    02-01-2011, 09:26 PM Go to last post
  39. Need help in excel with right tail??

    Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are...

    Started by tyrankj‎, 08-21-2008 01:55 AM
    • Replies: 11
    • Views: 26,306
    08-21-2008, 12:59 PM Go to last post
  40. 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: 26,292
    05-31-2011, 06:07 AM Go to last post
  41. Logistic Regression - How to interpret a Exp(b)= 0

    Hi all, I'm working on a project and keep getting caught up with how to interpret my results. I've found lots of info on how to interpret...

    Started by jessireebob‎, 05-01-2013 12:16 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 26,089
    05-03-2013, 04:45 AM Go to last post
  42. Arrow interpretation of t-test result

    Hi, could you please take a look at the image below and explain for me what the followings mean? 1. hypothesized mean difference 2. t-stat...

    Started by Nicky‎, 03-07-2009 10:31 AM
    • Replies: 1
    • Views: 25,918
    03-08-2009, 01:27 PM Go to last post
  43. Rates vs Percentage

    What is the rule of thumb for when to report a rate vs. a percentage? For example, if you want to show trends from year to year in the...

    Started by entropy84‎, 09-09-2010 08:08 AM
    • Replies: 1
    • Views: 25,915
    09-09-2010, 12:49 PM Go to last post
  44. Residuals v.s errors

    What is the difference between a residual and an error? Is it wrong to say an error is the difference between the data points and a fitted line...

    Started by katlego‎, 09-27-2011 05:41 AM
    residuals
    • Replies: 3
    • Views: 25,888
    09-28-2011, 12:56 PM Go to last post
  45. What is the difference between Students t distribution and normal distribution?

    I thought the t-distribution was supposed to be normal. However, when I run p-p plots on my data comparing the t distribution and the normal...

    Started by somnum‎, 11-25-2008 11:25 AM
    • Replies: 10
    • Views: 25,848
    11-26-2008, 05:48 PM Go to last post
  46. Mean of residuals = 0

    Hey im having trouble proving the mean of the residuals must always be zero. Can someone help me with this? Thanks :D

    Started by wenhotbabe2‎, 05-09-2009 09:28 PM
    • Replies: 2
    • Views: 25,842
    05-12-2009, 08:28 AM Go to last post
  47. Need major help in this statistics problem

    When looking at my text book. To answer the A, B, and C. at the bottom, we had to refer to our previous question in our book to help us with the...

    Started by sabbycat‎, 05-27-2008 10:09 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 25,450
    05-27-2008, 07:59 PM Go to last post
  48. Smile Confidence Intervals for Skewed right distribution.

    We have compiled data and made a histogram where n = 91,800. The average is 0.14098, the standard deviation is 0.143945, kurtosis is 8.23115, and...

    Started by joecama8‎, 07-17-2008 02:02 PM
    • Replies: 3
    • Views: 25,391
    07-18-2008, 02:57 PM Go to last post
  49. Post reading F Table values

    After using the F test using formula / where q is the number of beta values taken out ( that was 2) and k = number of parameters in the...

    Started by Mosphaitus‎, 08-20-2008 05:56 AM
    • Replies: 3
    • Views: 25,390
    08-21-2008, 01:41 PM Go to last post
  50. série temporelle

    Bonjour, Dans le cadre de ma formation je dois réaliser une étude statistique à partir d'une base de données (sur n'importe quel sujet) Je suis...

    Started by reema‎, 05-02-2013 06:59 AM
    • Replies: 1
    • Views: 25,239
    05-02-2013, 04:04 PM Go to last post
  51. predicted value

    Find the best predicted value of y corresponding to the given value of x. Four pairs of data yeild r= 0.942 and regression equation y-hat = 3x....

    Started by hannao1‎, 04-21-2006 05:23 PM
    • Replies: 11
    • Views: 25,171
    12-20-2013, 03:14 AM Go to last post
  52. ANOVA - Greenhouse Geisser

    Hey folks, I'm just a little bit confused and hope someone might can help me: I'm working on the statistics part of my thesis and performed...

    Started by vier.gewinnt‎, 06-10-2008 11:31 AM
    • Replies: 4
    • Views: 25,132
    03-02-2016, 11:05 AM Go to last post
  53. Dummy variables, standard deviation, standard error

    Hi everyone, I am a PhD student in economics and i would like to know your opinions on the following problem. What is the meaning of the...

    Started by Fabio Pieri‎, 01-31-2008 04:00 AM
    • Replies: 1
    • Views: 25,089
    02-04-2008, 10:56 AM Go to last post
  54. Normalizing standard deviation

    Greetings! This is a simple question, I think, but one that I am too rusty now to deduce a clear answer to. If I have a mean (m) and associated...

    Started by Stubaan‎, 01-10-2013 06:26 PM
    • Replies: 3
    • Views: 25,083
    01-11-2013, 09:34 PM Go to last post
  55. Question non-parametric two way ANOVA

    Hello, I'm so glad i found this site! I am wondering whether anyone knows of what non-parametric test i could use as equivalent to a two way...

    Started by anna57‎, 11-20-2008 05:32 AM
    • Replies: 7
    • Views: 25,004
    11-21-2008, 11:41 AM Go to last post
  56. Cool T-test versus ANOVA

    Hi all, I have two groups that I need to compare on several different dependent variables. I am wondering why I would choose to use a one-way...

    Started by nmrp‎, 05-05-2012 10:21 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 24,862
    03-06-2014, 03:03 PM Go to last post
  57. Lower Limit and Upper Limit Confidence Levels

    I am having trouble with a set of homework questions revolving around upper and lower limit confidence levels. Here is an example of what I mean: ...

    Started by seahawk10‎, 08-06-2007 01:59 AM
    • Replies: 1
    • Views: 24,771
    08-09-2007, 05:52 PM Go to last post
  58. Mixed Repeated Measures ANOVA - some questions

    I have run an experiment and am analysing the results using a mixed RM ANOVA in SPSS. I have two queries, which I hope you can help me with. I...

    Started by garywood84‎, 01-17-2009 07:23 PM
    • Replies: 7
    • Views: 24,623
    05-19-2009, 08:55 PM Go to last post
  59. table of critical Q-value

    I am searching for a table of critical Q-values for n=100 (or more). Anyone can help me? thank you!

    Started by netrunner‎, 08-11-2008 05:23 AM
    • Replies: 4
    • Views: 24,530
    08-11-2008, 10:38 AM Go to last post
  60. Assigning weights to variables

    Hi all, I'm not a statistician, but just trying to get help on an analysis I'm running, so I apologize ahead of time if this question is basic,...

    Started by jjcinnj‎, 06-11-2011 12:49 PM
    • Replies: 4
    • Views: 24,483
    06-11-2011, 02:57 PM Go to last post

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