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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: 197,299
    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: 67,050
    09-30-2005, 09:44 AM Go to last post
  1. Games-Howell tests in R

    Hiya, I have a set of data with one IV (3 levels) and 1 DV which fail a Bartlett's test for homogeneity of variance and the data cannot be...

    Started by hrj21‎, 06-18-2012 07:06 AM
    • Replies: 1
    • Views: 7,982
    06-19-2012, 11:03 AM Go to last post
  2. stastistical test on normalized data

    I have to perform a stastistical test to asses if two grug show the same or different effect on my prepartion. I tested on the same preparation only...

    Started by simobio53‎, 09-12-2007 05:51 AM
    • Replies: 3
    • Views: 7,981
    09-12-2007, 09:28 PM Go to last post
  3. Statistical Test to Compare Two Methods

    Hello, I sequenced some samples using two different sequencing methods and I want to compare the results. The two methods give very different...

    Started by bpyoumans‎, 07-20-2010 03:08 PM
    • Replies: 4
    • Views: 7,977
    07-20-2010, 04:52 PM Go to last post
  4. Confidence Intervals, Test of Significance, Matched Pairs Test of Significance

    Well, I have a test tomorrow on this stuff and I don't know where to start. here's some example questions: An SRS of 100 postal employees...

    Started by bigdub‎, 04-29-2009 09:24 PM
    • Replies: 2
    • Views: 7,973
    04-29-2009, 09:57 PM Go to last post
  5. Paired T-test on time series

    Hi, Data are time serie force signals of 150 samples each (1,5 seconds at 100 Hz acquisition). There are 10 subjects with two conditions. ...

    Started by Exovede‎, 10-29-2008 09:27 AM
    • Replies: 1
    • Views: 7,966
    10-31-2008, 12:37 PM Go to last post
  6. McNemar's test?????

    So I gathered paired categorical data and I need to know how to analyze it. My teacher told me to use a McNemar's test but we have never done that...

    Started by Punkyc7‎, 03-15-2011 06:17 PM
    • Replies: 2
    • Views: 7,964
    03-15-2011, 06:47 PM Go to last post
  7. Using normal to approximate binomial

    "After changing to newer healthier food oils, the company claims that 97 out of 100 people cannot detect a difference in taste between the new and...

    Started by endeavor‎, 11-18-2008 09:00 PM
    • Replies: 1
    • Views: 7,963
    11-19-2008, 09:23 AM Go to last post
  8. Different significance values from Pearson and Spearman tests

    Hi I am asking for help because I am confused with the interpretaion of the results. The data is obviously non-linear as Pearson coeficient is...

    Started by Grustni‎, 10-18-2011 03:03 AM
    • Replies: 8
    • Views: 7,953
    10-19-2011, 09:05 PM Go to last post
  9. level of measurement

    Hi John, just to confirm if the following is the ratio measurement. I belive its ratio because the zero is the actual possibility, when there is no...

    Started by Amjad‎, 02-23-2006 11:15 AM
    • Replies: 4
    • Views: 7,950
    02-23-2006, 01:53 PM Go to last post
  10. symmetry of distribution

    Hi, How can I test symmetry of a generic distribution? Is it correct: 1) mean-median=0 2) skewness=0 I think that it is very difficult that...

    Started by netrunner‎, 08-19-2008 10:14 AM
    • Replies: 2
    • Views: 7,947
    08-19-2008, 12:57 PM Go to last post
  11. Does Anybody Recognize This (Obscure?) Confidence Table?

    First, I just a greybeard programmer tasked to make sense of an old table the boss has. Second, I can't believe that nobody else took the username...

    Started by Norm‎, 10-05-2011 10:50 PM
    • Replies: 6
    • Views: 7,940
    10-07-2011, 05:12 PM Go to last post
  12. ANCOVA when variances are not equal?

    I am currently writing a 4th year freshwater biology report analysing data collected on the length and weight of fish from 2 sites, collected over 3...

    Started by Roy99‎, 10-06-2011 07:26 AM
    ancova, anova, non-parametric, non-parametric anova
    • Replies: 6
    • Views: 7,940
    02-07-2016, 11:54 AM Go to last post
  13. Meanings of a set of data

    Hi, My name is ngungo, means innocent or ignorant, and I am new here. I am a retired Computer Process Control Engineer. I had few statistics...

    Started by ngungo‎, 06-01-2012 10:25 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 7,933
    07-10-2012, 07:11 PM Go to last post
  14. Interpreting Wilcoxon results - median or ranks?

    Hi all, I have been using Wilcoxon tests for ages but am now wondering if I have been interpreting them incorrectly all this time. I'll use a...

    Started by sab‎, 04-18-2012 05:27 AM
    • Replies: 2
    • Views: 7,919
    04-20-2012, 05:18 AM Go to last post
  15. Best book on mathematical statistics

    Hi Please advice me a good book on mathematical statistics.I want it to be oriented in math students or engineering level. Best Regards

    Started by drunkenphd‎, 06-29-2013 02:09 PM
    • Replies: 2
    • Views: 7,910
    06-29-2013, 10:45 PM Go to last post
  16. Percentile rank

    Can someone help me with the following problem? Thanks in advance ! :) Jon Molnar will graduate from Carolina Forest High School this year. He...

    Started by kate‎, 08-22-2005 09:36 PM
    • Replies: 2
    • Views: 7,904
    08-23-2005, 11:16 PM Go to last post
  17. Likert Scale Analysis - How to?

    Greetings, I am new to Talk Stat and could use some help. Background: I did a survey on the effects of ISO 9000 on business performance using a...

    Started by stammx‎, 11-28-2010 09:33 PM
    • Replies: 7
    • Views: 7,901
    11-30-2010, 12:47 AM Go to last post
  18. Justify the use of parametric tests on non normally distributed data

    Hello there. I have 5 Likert scale questionnaires that have been answered by the same people who have been randomly selected (N=24) and i have the...

    Started by skoui‎, 03-16-2014 08:37 AM
    likert, non parametric, normal distribution, normality, normality test, parametric test, survey
    • Replies: 4
    • Views: 7,900
    03-16-2014, 03:48 PM Go to last post
  19. Unhappy What is the percentage increase in the number of days on the disabled list

    I really really need help here "Injuries to Major League Baseball players have been increasing in recent years. For the period 1992 to 2001,...

    Started by junjji‎, 03-17-2011 02:23 AM
    • Replies: 1
    • Views: 7,898
    03-17-2011, 08:34 AM Go to last post
  20. Ungrouped data

    Hi. First off thanks for this community, it has helped already. I have a midterm review sheet and the following is on it: Data is given and...

    Started by perplehaze‎, 10-24-2008 11:15 AM
    • Replies: 1
    • Views: 7,897
    10-24-2008, 11:43 AM Go to last post
  21. Uniformly most powerful test

    Let X1, X2,...Xn be a random sample from the distribution having pdf: f(x|theta)=theta^2 * x * e^(-theta * x), where x>theta and theta>0 I...

    Started by Darktranquillity‎, 11-30-2011 01:06 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,897
    12-01-2011, 04:41 PM Go to last post
  22. Understanding the math behind logistic regression.

    Please take a look at the following page: http://statpages.org/logistic.html If you click the solve button the results window will carry out...

    Started by ColinP‎, 10-22-2010 09:52 PM
    • Replies: 5
    • Views: 7,890
    10-23-2010, 11:30 PM Go to last post
  23. Covariance of a Joint Density Fxn

    Okay, so this is supposed to be an "easy" problem on my assignment. Am I making this out to be more difficult than it is? Here is the initial...

    Started by miragebass‎, 10-18-2010 12:31 PM
    • Replies: 5
    • Views: 7,889
    10-18-2010, 01:24 PM Go to last post
  24. Test for normality

    HI, I have a question on my test of normality. I have 1 independant variables (type of maps) ..so if my data is normal, i should be conducting one...

    Started by lynnar‎, 02-22-2012 10:40 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,887
    03-09-2012, 03:13 AM Go to last post
  25. Stepwise Ordinal Logistic Regression

    How do I run a Stepwise Ordinal Logistic Regression in SPSS (v. 16)? If I can't... what about SAS? Thanks!

    Started by witheye‎, 09-04-2008 10:43 AM
    • Replies: 1
    • Views: 7,880
    09-04-2008, 04:46 PM Go to last post
  26. Theoratical

    2. The value of the z-score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant explain...

    Started by SadieKhan‎, 10-14-2010 05:05 AM
    • Replies: 3
    • Views: 7,880
    10-15-2010, 02:54 AM Go to last post
  27. how can i use excel to solve some Statistics problems ,,,

    hi all ,,, am looking here for help. to know how to solve some stat problem with excel could someone help me please ,,,, :shakehead well...

    Started by Mrnewbie‎, 12-05-2010 03:54 AM
    • Replies: 3
    • Views: 7,879
    12-05-2010, 10:43 PM Go to last post
  28. How to determine sample size for non-parametric data?

    We recently performed some tests where the 41 data points were determined to not be normal and could not be transformed. Is there any way to...

    Started by ThaRide‎, 06-03-2009 08:33 AM
    • Replies: 4
    • Views: 7,864
    06-05-2009, 03:13 PM Go to last post
  29. Question When to Use Chi-Square Versus ANOVA

    Hello, all! :) Warning! This is a long one. What do you think?

    Started by DarkAdaptation‎, 07-30-2008 08:46 AM
    • Replies: 2
    • Views: 7,853
    07-30-2008, 12:09 PM Go to last post
  30. Help with gathering statistic information.

    Here is what I have done thus far. I can identify what each of the required information is, but I don't think I'm getting it exact. Here is my...

    Started by billclintonnn‎, 11-04-2013 12:36 PM
    information, math, stats
    • Replies: 4
    • Views: 7,843
    11-04-2013, 09:02 PM Go to last post
  31. Question Min sample size for Wilcoxon Rank Sum test

    Hi, I have data measurements (eg, running cost) that keep coming in to the system continuously. There are two groups (say X and Y) that I want to...

    Started by hajjat‎, 08-21-2013 07:07 AM
    power analysis, sample size, sample size determination, wilcoxon rank sum test
    • Replies: 5
    • Views: 7,842
    08-22-2013, 01:00 PM Go to last post
  32. Two-Way ANOVA without raw scores

    Hey, I need to be able to perform a two-way ANOVA without raw data - i.e. with only means, standard deviations and sample sizes available. ...

    Started by Alsvartr‎, 07-26-2008 11:15 AM
    • Replies: 4
    • Views: 7,836
    07-26-2008, 01:28 PM Go to last post
  33. Missing data - questionnaire with Likert scale data

    Hi, I have a few questions, please enlighten me if you can! I have a questionnaire with 240 questions (Likert scale). There's a lot of missing. ...

    Started by rusken27‎, 04-20-2010 01:45 PM
    • Replies: 0
    • Views: 7,835
    04-20-2010, 01:45 PM Go to last post
  34. Question Homework question

    I am clueless as to how to answer this question. The United Nation declared that the worl's six-billionth inhabitant was born on October 12, 1999...

    Started by LaurieAnn1‎, 03-23-2011 10:50 AM
    • Replies: 4
    • Views: 7,812
    03-24-2011, 03:22 PM Go to last post
  35. left-hand-tailed chebyshev (Cantelli's) inequality

    I'd like to use the one-tailed chebyshev inequality to help me describe some weather data. The proper inequality as I understand it is:...

    Started by kpjoyce‎, 12-13-2007 03:57 PM
    • Replies: 3
    • Views: 7,809
    12-14-2007, 02:43 PM Go to last post
  36. k-value selection with Tukey HSD

    I have a question about Tukey’s HSD post-hoc test. My concern is selecting the appropriate K-value used along side the Error DF term to select...

    Started by Yama‎, 07-31-2008 02:44 PM
    • Replies: 3
    • Views: 7,808
    08-04-2008, 12:16 PM Go to last post
  37. Is there a way to test the significance of a linear regression in excel?

    Please bear with greenhorn. Thanks. ^^

    Started by hehe1223‎, 07-01-2010 11:49 AM
    • Replies: 3
    • Views: 7,802
    07-01-2010, 12:42 PM Go to last post
  38. Logistic regression vs T tests, and multiple response sets

    Hi, this is a great forum you have here, so I thought I'd ask a small, silly question that's been bugging me for a while. A few weeks ago, I...

    Started by a1rplay‎, 11-17-2010 11:17 PM
    • Replies: 5
    • Views: 7,794
    11-22-2010, 10:05 AM Go to last post
  39. Hypothesis

    5) A sample of 40 observations is selected from one approximately normal population. The sample mean is 102 and the sample standard deviation is 5. A...

    Started by dbardy‎, 03-19-2008 06:50 PM
    • Replies: 1
    • Views: 7,791
    03-20-2008, 10:20 AM Go to last post
  40. Categorical Variables - Dummy Coding?

    Hi - I have a question pertaining to a categorical predictor variable with 3 levels (high, medium, low), a continuous predictor variable on a 7-pt...

    Started by CogPsych01‎, 04-15-2011 01:38 AM
    • Replies: 4
    • Views: 7,789
    05-18-2011, 10:07 AM Go to last post
  41. Mean vs. median

    Can someone explain when the proper time would be to use median vs. mean. I have a lot of questions revolving around "was this the appropriate...

    Started by jenclark242‎, 09-23-2010 12:04 PM
    • Replies: 5
    • Views: 7,777
    09-23-2010, 12:44 PM Go to last post
  42. Correct Analysis Method for 1:1 and 1:4 Matched Studies with Continuous Outcomes?

    I have several questions about analyzing 1:1 and 1:M matched studies that have a continuous outcome variables. 1.To determine difference in 2...

    Started by Life_Learner_1‎, 10-08-2012 07:13 AM
    1:1, 1:m, analysis, continuous, matched
    • Replies: 4
    • Views: 7,777
    10-08-2012, 02:13 PM Go to last post
  43. alternative for chi square

    what is the alternative for (2x2 table) chi square if more than one cell has an expected value of less than 5, given that the sample size is more...

    Started by nurul‎, 09-15-2010 08:52 AM
    • Replies: 4
    • Views: 7,773
    09-15-2010, 08:30 PM Go to last post
  44. Independent Sample T Test - Levene's Test for Equality of Variances

    Hi everyone! I am currently doing a dissertation for my undergraduate studies. I am currently stuck with a question about Levene's Test for Equality...

    Started by xLioneLx‎, 12-12-2012 07:33 AM
    • Replies: 5
    • Views: 7,771
    12-13-2012, 09:48 PM Go to last post
  45. How many combinations?

    Hi all - I wonder if this might be the place to to find an answer to this question. I am trying to work out whether a key-safe I am thinking of...

    Started by sebbyh‎, 08-05-2011 01:17 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,768
    08-06-2011, 10:32 AM Go to last post
  46. Can I interpret Cramer's V without seeing the chi square value?

    Hi all, Is such data possible? The variables are not significantly related (p>0.05), but Cramer's V value of 0.6. What does it mean? I read...

    Started by emilyling‎, 07-12-2010 03:55 AM
    • Replies: 0
    • Views: 7,762
    07-12-2010, 03:55 AM Go to last post
  47. Kurtosis - where does the minus 3 come from?

    I've been trawling the web for an example for quite a while. I understand that the 3 corrects the kurtosis of the normal distribution - I'm just not...

    Started by dcx‎, 12-22-2010 06:58 PM
    • Replies: 2
    • Views: 7,762
    12-22-2010, 07:34 PM Go to last post
  48. Scheffe's test

    Hi What is the exact formula for Scheffe's yest?

    Started by rockyallen7771‎, 12-02-2010 01:13 PM
    • Replies: 5
    • Views: 7,761
    12-02-2010, 06:43 PM Go to last post
  49. Mode and the continuous uniform distribution

    Hello. I'm interested in opinions (with reasons) on whether or not the continuous uniform distribution has a mode or not. There seems to be no...

    Started by univariate‎, 08-04-2009 04:44 PM
    • Replies: 1
    • Views: 7,759
    08-04-2009, 10:01 PM Go to last post
  50. Comparing groups - z-scores

    I have two groups A and B. Each subject has provided scores on a number of tests, and I want to give each subject an overall score based on these...

    Started by Alsvartr‎, 08-16-2006 03:20 AM
    • Replies: 2
    • Views: 7,751
    08-16-2006, 11:59 AM Go to last post
  51. total deviation of the sum of unrelated means

    As a starter - I am a newbie to this forum (and forums in general). Also, I have a very (very) basic understanding of stats/prob. Thank you in...

    Started by blewsman‎, 06-01-2012 06:46 PM
    • Replies: 2
    • Views: 7,749
    06-04-2012, 02:07 PM Go to last post
  52. Question Binomial Distribution

    One classical experiment on ESP (extrasensory perception) tests for the ability of an individual to show telepathy-that is, to read the mind of...

    Started by filarosa‎, 08-14-2012 10:30 PM
    binomial distribution, cards, probability, statistics, success rate
    • Replies: 3
    • Views: 7,746
    02-18-2016, 10:31 AM Go to last post
  53. Correlation of 3 variables

    I am having problems with a small statistical analysis project. I have two input variables that when taken together should correlate with an...

    Started by JeffHodgin1986‎, 02-16-2009 11:56 AM
    • Replies: 5
    • Views: 7,727
    02-16-2009, 12:18 PM Go to last post
  54. Teacher couldn't solve; please help!

    An orange juice producer buys all his oranges from a large orange orchard. The amount of juice squeezed from each of these oranges is approximately...

    Started by Trying4MBA‎, 07-13-2011 12:23 PM
    • Replies: 6
    • Views: 7,726
    07-14-2011, 12:34 PM Go to last post
  55. Beta coefficients - making inferences about explained variance from betas

    Hi, Although I like stats it's not my strongest point so I am trying to learn, thus, I acknowledge in advance that the following question is very...

    Started by hermes014‎, 01-26-2014 02:16 PM
    • Replies: 6
    • Views: 7,726
    01-27-2014, 04:08 PM Go to last post
  56. Polynom/spline/function for "upper and lower limit" (± 2 SD)

    I have some hemoglobin values from children aged 0-18 years. I'd like to produce reference ranges for hemoglobin based on these values. Let's say I...

    Started by danlewis‎, 04-16-2014 04:46 AM
    • Replies: 3
    • Views: 7,724
    04-17-2014, 07:40 AM Go to last post
  57. mixed model ANOVA - non parametric version

    Hi Folks, I have two groups scored on the same assessment at four timepoints. From what I understand these data would be appropriately analyzed by...

    Started by railway‎, 10-16-2011 04:58 PM
    • Replies: 4
    • Views: 7,708
    11-10-2011, 09:20 AM Go to last post
  58. Lightbulb Inverse of the Standard Normal Cumulative Distribution Calculation

    Hi Everyone, I'm trying to verify the calculation for the Inverse Cumulative Standard Normal Distribution Function represented by the Excel...

    Started by andreja‎, 09-25-2014 02:13 AM
    • Replies: 8
    • Views: 7,704
    10-02-2014, 10:39 AM Go to last post
  59. type I error - non parametric stats

    i have run multiple non parametric stats to analyse my data. i read that you cannot make a type I error because the data is not normally distributed,...

    Started by johnboy‎, 08-30-2006 06:37 AM
    • Replies: 1
    • Views: 7,700
    08-30-2006, 08:29 AM Go to last post
  60. What is the F-statistic?

    I was asked to use the f-statistics to determine the overall significance of the regression equation which is y=12559.7477 + 4265.7566X, note that...

    Started by danswe3‎, 03-26-2011 04:12 PM
    • Replies: 2
    • Views: 7,696
    03-28-2011, 02:27 PM Go to last post

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