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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: 197,217
    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: 66,990
    09-30-2005, 09:44 AM Go to last post
  1. Non parametric alternatives to MANOVA

    I need to perform a MANOVA onto non parametric data in a repeated measures design. The "Median test" is not the one, so.. anybody can help ? I...

    Started by ryochan‎, 03-16-2010 04:57 PM
    • Replies: 4
    • Views: 20,105
    08-31-2011, 08:07 AM Go to last post
  2. Difference between QQ and PP plot

    Hello all, I consider my self fairly well rounded in linear models, but i cant for the life of me see how a PP plot is different from a QQ plot :)...

    Started by thedreamshaper‎, 11-22-2010 12:25 PM
    • Replies: 1
    • Views: 20,080
    08-11-2011, 06:50 PM Go to last post
  3. Principal Component Analysis of non-parametric data?

    Some colleagues of mine have conducted an analysis of a survey, and I'm wondering if their approach makes sense or not. This is my first exposure to...

    Started by MiltonF‎, 11-13-2010 08:57 PM
    • Replies: 4
    • Views: 20,037
    11-14-2010, 01:15 AM Go to last post
  4. acceptable Skewness and Kurtosis

    During statistical lectures as a rule of thumb I've learned that kurtosis and skewness between -3 and +3 is acceptable. I can't find any reference...

    Started by Patrick@RU‎, 07-03-2013 09:59 AM
    • Replies: 3
    • Views: 19,994
    07-14-2013, 06:11 AM Go to last post
  5. difference between Critical Difference (CD) and Least Significant Difference (LSD)

    Hi, I am Ansuman Biswas from India. I have just started working on basic of ANOVA in our chemical lab work. Can anybody tell me what is the...

    Started by ansumanbiswas‎, 11-03-2007 01:12 AM
    • Replies: 1
    • Views: 19,908
    06-26-2010, 07:55 AM Go to last post
  6. Minimum sample size for paired t-tests

    Hi All, I remember reading somewhere that the minimum sample size to conduct paired t-tests was ~30, as this will ensure that there is adequate...

    Started by bozatron‎, 09-18-2012 09:49 PM
    • Replies: 7
    • Views: 19,868
    09-23-2012, 12:48 AM Go to last post
  7. How to perform simple main effects analysis in SPSS?

    How can I perform a simple main effect analysis on SPSS? I shall use it as post-hoc test but am not really sure. I know I can somehow work in the...

    Started by ein8horn‎, 08-21-2011 05:51 PM
    simple main effect, spss, syntax
    • Replies: 5
    • Views: 19,736
    08-29-2011, 08:01 AM Go to last post
  8. Always able to assume normality if sample size >= 31

    I know at a sample size of 31 or larger, and from a random sample selection, you are able to assume normality. Is this in general always true? If...

    Started by cmf0106‎, 09-21-2009 11:51 AM
    • Replies: 6
    • Views: 19,730
    09-28-2009, 03:21 PM Go to last post
  9. shared variance

    can anybody give me simple definition of this concept? Is it the same as covariance?

    Started by godfather‎, 06-05-2007 02:44 AM
    • Replies: 2
    • Views: 19,687
    05-10-2013, 12:02 PM Go to last post
  10. Finding Scores from Z score table

    Scores on the WAIS test approximate a normal curve with a mean of 100 and a standard deviation of 15. Q: What IQ score is identified with the...

    Started by nabilalk‎, 02-23-2008 05:39 AM
    • Replies: 5
    • Views: 19,607
    02-23-2008, 09:24 PM Go to last post
  11. How to test change over (continuous) time

    Hi everyone, I am wondering how to test the following case: A doctor wants to test a new anti-fever drug. So he gets 10 sick people with fevers...

    Started by lightningjeh‎, 09-18-2010 04:34 PM
    • Replies: 6
    • Views: 19,592
    09-19-2010, 10:03 AM Go to last post
  12. How to find quartiles with only the mean?

    I am taking an Elementary Statistics class and I am having a very hard time. I know how to achieve getting quartiles on the TI-84 using the STAT...

    Started by bennaloe‎, 10-20-2011 12:22 PM
    • Replies: 4
    • Views: 19,447
    10-21-2011, 06:34 AM Go to last post
  13. Calculating a P-Value from an F-statistic...

    Hello. I am doing an assignment and I have to find the p-value from a test. I can't understand how my professor did it in the notes. My...

    Started by Sturm‎, 02-20-2010 12:49 PM
    • Replies: 3
    • Views: 19,317
    02-21-2010, 03:09 AM Go to last post
  14. unbiased estimator for 1/p of geometric distribution

    Suppose X is a random variable with geometric distribution, and parameter p, 0<p<1, how do you find a statistc that is unbiased estimator of 1/p? Do...

    Started by colstat‎, 11-16-2010 11:55 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 19,294
    12-09-2012, 10:11 PM Go to last post
  15. What is meant by calculate a 95% half confidence interval? Half??

    In statistics. How do i work out a half confidence interval? I have a ti-83 calculator that does formulas for me. But what is meant by work out a...

    Started by cand26‎, 06-14-2009 11:13 PM
    • Replies: 3
    • Views: 19,237
    06-15-2009, 05:55 AM Go to last post
  16. Calculating 95% confidence interval from mean, SD and number of subjects

    Dear All I have been asked to present some information from a series of published articles according to Mean (+/- 95% Confidence Interval). The...

    Started by drhealy‎, 01-13-2012 12:42 PM
    confidence interval, means, standard deviation, systematic review
    • Replies: 4
    • Views: 19,179
    01-13-2012, 03:15 PM Go to last post
  17. Stat101 y-intercept of regression line

    Slope of regresson line is 1.4, the mean of x-values is 5.0, mean of y-values is 6.5. What is the y-intercept of regression line?

    Started by aenyiema‎, 09-09-2009 08:16 AM
    • Replies: 3
    • Views: 19,137
    09-09-2009, 11:29 AM Go to last post
  18. Confidence Interval of Multiple Regression

    Hi Stupid question but I'm trying to work out a confidence interval estimate for the mean response. The formula I have in front of me is the...

    Started by qwe789123‎, 10-18-2010 07:35 AM
    • Replies: 4
    • Views: 19,018
    08-11-2012, 12:44 PM Go to last post
  19. Cronbach's for Yes/No Questions?

    I have a survey that contains a number of yes/no questions and I'm starting to think that Cronbach's is not the way to go for reliability analysis. ...

    Started by YetAnotherGradStudent‎, 02-13-2010 05:15 PM
    • Replies: 4
    • Views: 19,002
    02-16-2010, 05:28 AM Go to last post
  20. t distribution for Proportion impossible?

    Good afternoon, What are the reasons that we only use Z distribution for proportion confidence intervals, but we can use both Z and t...

    Started by mysterdusk‎, 10-18-2010 11:55 PM
    • Replies: 10
    • Views: 18,870
    02-23-2011, 05:01 PM Go to last post
  21. Arrow Standard Deviation of Subtraction

    Hello, Thanks for looking at my post. I am analyzing data for filtration through a set of membranes of different sizes. To get the range of...

    Started by orion573‎, 02-22-2008 04:41 PM
    • Replies: 2
    • Views: 18,851
    02-22-2008, 06:33 PM Go to last post
  22. how to use ANOVA in excel-Please HELP!

    Hi, I need to use 2way ANOVA in excel but I always get the error of "input range contains non-numeric data". I am guessing this happens because I...

    Started by baris‎, 03-04-2010 05:49 PM
    • Replies: 7
    • Views: 18,810
    05-08-2010, 12:52 AM Go to last post
  23. Ranking question analysis

    I want to understand what is the best to analyze ranking data. We just completed a survey with 132 respondents. They were shown a list of 11...

    Started by hcsurvey‎, 03-22-2011 12:09 PM
    • Replies: 2
    • Views: 18,672
    03-22-2011, 02:37 PM Go to last post
  24. Fair Coin... Chi square or binomial?

    Hello all, this is my first post, so please be gentle with me. When testing whether a coin is fair or not, is it correct to use the binomial...

    Started by TheDuck‎, 08-28-2010 09:03 PM
    • Replies: 7
    • Views: 18,657
    08-29-2010, 01:24 PM Go to last post
  25. Why does p value differ for one tail and two tail t test?

    I am totally confused. I thought only critical values differ for one tail and two tail t test, but p value stays the same? The following is what I...

    Started by hehe1223‎, 07-22-2010 04:15 PM
    • Replies: 2
    • Views: 18,645
    07-22-2010, 05:24 PM Go to last post
  26. Simpson's diversity index - comparing 2 sites

    I need to compare the Simpson's Diveristy Index of 2 sites. For each site I have collected beetles using pitfall traps - 20 traps per site. Using...

    Started by Entomologist‎, 07-20-2011 02:11 PM
    simpson's diversity index
    • Replies: 9
    • Views: 18,528
    07-21-2011, 12:47 AM Go to last post
  27. Help finding complement

    I'm having trouble getting the appropriate response from my brain to the paper. Was wondering if you could help. Here's the question: Suppose a...

    Started by cglags‎, 10-23-2008 11:56 AM
    • Replies: 4
    • Views: 18,457
    10-23-2008, 12:35 PM Go to last post
  28. sample stdev (s) vs population stdev (sigma)

    Hi! In what situation would one be calculating the population standard deviation (sigma) and when the sample standard deviation s? An example:...

    Started by m0nkey‎, 11-06-2010 10:17 PM
    • Replies: 2
    • Views: 18,434
    11-06-2010, 10:57 PM Go to last post
  29. What are the benefits of Variance and Standard Deviation

    Dear Friends, Please let me know the benefits of Variance and Standard Deviation. What all, I can do using Variance and Standard Deviation. How...

    Started by Thakur‎, 11-15-2008 01:49 PM
    • Replies: 4
    • Views: 18,431
    11-16-2008, 11:03 AM Go to last post
  30. Standard Deviation Bars and Standard Error Bars

    What is the difference between standard deviation bars and standard error bars? Also, what are the advantages and disadvantges of each approach?...

    Started by Kortnie‎, 12-17-2008 06:31 PM
    • Replies: 3
    • Views: 18,232
    12-18-2008, 12:59 PM Go to last post
  31. finding UMVU estimator of parameter γ(θ)

    suppose X_1,X_2,…,X_n,X_{n+1} be a random sample of distribution N(θ,1). if γ(θ)=P(∑Xi>X_{n+1}) (i=1,2,...,n) how can i find UMVU estimator of...

    Started by hadiSanji‎, 05-03-2012 01:37 PM
    statistic
    • Replies: 1
    • Views: 18,219
    05-03-2012, 03:17 PM Go to last post
  32. Linear Regression - Sum of Squared Residuals - Point Estimate of Error Variance

    Hi, I'm just beginning to study simple linear regression and so far understand the least squares method of estimating the slope and intercept...

    Started by mintsmike‎, 07-05-2011 05:49 PM
    • Replies: 6
    • Views: 18,199
    07-06-2011, 11:05 AM Go to last post
  33. How to apply Continuity Correction Factor to stat test

    Regarding Hypothesis Test for Difference Between Proportions: http://stattrek.com/ap-statistics-4/test-difference-proportion.aspx Is it ever...

    Started by egret‎, 09-16-2011 09:42 AM
    • Replies: 4
    • Views: 18,066
    09-17-2011, 04:32 PM Go to last post
  34. Requirements for a probability density function?

    i am trying to develop a PDF that i will use to model height of trees in a certain forest.Can you give me some requirements for a PDF and explain...

    Started by xaxaro‎, 06-12-2009 01:13 PM
    • Replies: 7
    • Views: 18,063
    10-30-2011, 05:39 PM Go to last post
  35. Determining the p-value of an H0: A≠B

    I noticed that there seemed to be a relation between 2 variables I measured on an experiment. I got the correlation coefficient and the slope for...

    Started by fuidcoap‎, 06-06-2013 07:35 PM
    • Replies: 1
    • Views: 18,060
    06-20-2013, 03:23 AM Go to last post
  36. The concept behind finding probabilities beyond a 3.4 z score positive or negative

    I could really use some assistance. I am taking a stats course for an mba and need to understand the concept behind finding probability for z scores...

    Started by Statschallenged2006‎, 10-29-2012 08:32 AM
    beyond a z scores of 3.4
    • Replies: 5
    • Views: 18,040
    10-29-2012, 11:56 AM Go to last post
  37. Logarithm in SAS

    Hello :wave:, Can somebody explain me how to take the logartihm in SAS, please? What is the right command? Thanx, nelson

    Started by nelson‎, 09-30-2008 11:37 AM
    • Replies: 1
    • Views: 17,975
    10-01-2008, 02:00 AM Go to last post
  38. Scatter plot of residuals versus fitted values

    Hello everyone, I was wondering if someone can help me with the following question: Suppose that you generate a scatter plot of residuals...

    Started by newuser2009‎, 02-15-2009 05:08 PM
    • Replies: 1
    • Views: 17,967
    02-15-2009, 05:19 PM Go to last post
  39. A thought about the link between Revelle's β coeff and CFA. Related?

    Hi stat freaks! :confused: I've just conducted an analysis of a scale's consistency (coeffs alpha, beta, omega, theta) and CFA to inspect the...

    Started by Martin Marko‎, 07-23-2015 02:45 PM
    cfa, consistency, revelle, scale development
    • Replies: 1
    • Views: 17,938
    07-25-2015, 04:19 PM Go to last post
  40. Probability with intervals

    Suppose a geyser has a mean time between eruptions of 70 minutes. If the interval of time between the reuptions is normally distributed with standard...

    Started by greenpumpkins‎, 11-03-2008 09:17 PM
    • Replies: 1
    • Views: 17,918
    11-04-2008, 08:36 PM Go to last post
  41. How can I remove a right/left skew from a data distribution?

    What kind of transformation will remove a right skew or a left skew from a distribution of data?

    Started by Giacomo‎, 03-02-2009 03:23 PM
    • Replies: 2
    • Views: 17,904
    03-03-2009, 02:03 PM Go to last post
  42. effect size to report or not

    I challenged a prof today and I said that an effect size should not be reported for non significant results. He strongly disagreed. What are your...

    Started by trinker‎, 10-09-2012 12:32 PM
    2 Pages
    1 2
    effect size
    • Replies: 18
    • Views: 17,748
    10-10-2012, 03:15 PM Go to last post
  43. Problem: Unbiased estimator

    My question is: let (x1, x2,..., xn) be i.i.d, random variables drawn from some population with mean and variance. Is x(bar) square, as the sample...

    Started by non-sleeper‎, 02-03-2010 03:39 AM
    • Replies: 4
    • Views: 17,680
    02-03-2010, 04:50 PM Go to last post
  44. Dunn's (Bonferroni) t-test and Bonferroni correction

    Hi all, this may sound silly but....:o I want to run a series of Dunn's t tests, for multiple comparisons, but i want to evaluate my obtained...

    Started by Youjay‎, 01-17-2011 05:56 AM
    dunns t test
    • Replies: 4
    • Views: 17,664
    01-18-2011, 10:45 PM Go to last post
  45. Correcting for Autocorrelation in time-series data

    I am very new to time series data. I have a time series that probably has some significant autocorrleation issues and I want to estimate a linear...

    Started by thaumaturgy‎, 02-28-2010 04:15 PM
    • Replies: 2
    • Views: 17,645
    07-05-2010, 05:21 AM Go to last post
  46. comment représenter graphiquement ce constat?

    bonjour , j'ai un ensemble de données formé par les variables suivantes : 1-heure de la pointe de consommation d'énergie 2-mois le nombre...

    Started by maryo‎, 04-26-2009 07:43 PM
    • Replies: 2
    • Views: 17,635
    04-27-2009, 01:20 AM Go to last post
  47. multiplying Standard error of means

    Hi guys, I am new here (and also to statistics :o). I have a data set of many measurements. For each one of them I calculated the mean and the...

    Started by frymor‎, 03-23-2011 10:29 AM
    sem, standard deviation, standard error
    • Replies: 5
    • Views: 17,635
    03-01-2013, 03:54 PM Go to last post
  48. Bonferroni test - ANOVA post-hoc - Formula for the standard error

    Hi all, Was doing ANOVA (1 and 2 way) and messed with post-hoc with Bonferroni correction. As I understand formula for the test statistic is ...

    Started by alex84‎, 06-09-2010 06:49 PM
    • Replies: 4
    • Views: 17,538
    06-09-2010, 07:39 PM Go to last post
  49. Should you transform skewed data when the distribution is expected?

    Hi all, I have been discussing this topic all week with people in my department and I can't seem to get a straight answer. I was taught long ago...

    Started by joemama224‎, 06-03-2012 06:55 PM
    2 Pages
    1 2
    distribution, skew, transformation
    • Replies: 16
    • Views: 17,502
    06-12-2013, 07:29 PM Go to last post
  50. Mean or median values if not normally distributed?

    Hi everyone I got 50 people to rate a set of 100 images. I have calculated the mean ratings for each of the 100 images. But the data are not...

    Started by safig‎, 11-27-2009 06:15 AM
    • Replies: 6
    • Views: 17,486
    11-28-2009, 06:18 AM Go to last post
  51. Finding the Sufficient Statistic of Weibull Distribution.

    So I have a Weibull Distribution with two parameters with the following pdf: f(x/\alpha,\beta) = \frac{\beta}{\alpha^\beta} x^{\beta-1} exp ...

    Started by MegaMan‎, 12-02-2011 01:20 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 17,452
    12-05-2011, 04:29 PM Go to last post
  52. Question Pre/Post Likert scale--how to analyze??

    Hi:wave:! I am a doc student and have a few questions about a pre/post intervention likert scale I am trying to analyze. It is a 9 point sclae...

    Started by doc_student‎, 02-15-2009 08:47 PM
    • Replies: 4
    • Views: 17,425
    02-16-2009, 09:39 PM Go to last post
  53. Standard deviation for two groups

    Hello guys, Here is my problem. I have two groups the first one is from 42 members and the second -36. I have the average and standard deviation...

    Started by Pumata‎, 09-08-2008 06:18 AM
    • Replies: 3
    • Views: 17,405
    09-08-2008, 07:12 AM Go to last post
  54. Question How do I report the Bonferroni/Dunn statistic along with my ANOVA results?

    I recently conducted a factorial ANOVA for a research project and found that there was a significant interaction effect of my three treatments A, B...

    Started by rahooligan‎, 04-11-2010 06:59 PM
    • Replies: 1
    • Views: 17,404
    04-13-2010, 07:14 PM Go to last post
  55. Interpreting a correlogram

    Hi, I read a lot of things about ACF and PACF correlogramm, but I have so difficulties to interpret them. For example, here is a correlogram...

    Started by Latiole‎, 08-27-2012 04:53 AM
    • Replies: 1
    • Views: 17,286
    08-27-2012, 09:22 AM Go to last post
  56. Difference between incremental F-test and F-test??

    Is there any difference between incremental f-test and F-test ??

    Started by cmli4‎, 09-16-2010 02:07 AM
    f-test, incremental
    • Replies: 3
    • Views: 17,283
    09-16-2010, 06:27 AM Go to last post
  57. Quantitative vs Qualitative Data

    Would it be correct to say that qualitative data is discrete data and that quantitative data is continuous data? If not, would you mind providing...

    Started by scorcher863‎, 01-16-2008 10:50 AM
    • Replies: 3
    • Views: 17,255
    01-17-2008, 06:43 PM Go to last post
  58. R: test whether 2 samples exhibit same distribution

    Hey guys, how can I test in R whether 2 samples (each of size 8) have the same sample distribution or not? I've already tested both samples...

    Started by beginner‎, 02-19-2010 08:45 AM
    • Replies: 3
    • Views: 17,234
    02-22-2010, 11:57 AM Go to last post
  59. Why Finite Population Correction Factor is (N-n)/(N-1)

    When I read Stephen's Schaum's Outline of Theory and Problems of Elements of Statistics, in 13.10, it said : I just wanna know how to prove it...

    Started by wOOL‎, 03-06-2009 11:01 AM
    • Replies: 2
    • Views: 17,213
    03-07-2009, 10:05 AM Go to last post
  60. Question Nominal, Ordinal, Ratio, Interval...? Need help.

    I am having a really hard time with deciding whether things are nominal, ordinal, ratio, or interval. I was given four problems and asked to list...

    Started by jfoust01‎, 01-30-2006 01:42 PM
    • Replies: 2
    • Views: 17,136
    01-30-2006, 07:11 PM Go to last post

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