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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: 196,672
    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: 66,691
    09-30-2005, 09:44 AM Go to last post
  1. Manova (two-way, theree-way and so on

    I came across MANOVA (one-way) which can first examine whether there is an effect of an independent variable on the combined dependent variables;...

    Started by rahuls‎, 07-28-2010 11:37 AM
    • Replies: 6
    • Views: 12,508
    08-04-2010, 07:56 AM Go to last post
  2. Error calculation for yes/no survey questions

    Hi! I am trying to analyze the results of an annual survey with numerous yes/no questions. I can get the ratio of yes/no answers given to a...

    Started by elzolo‎, 07-30-2008 09:24 AM
    • Replies: 1
    • Views: 12,503
    08-03-2008, 11:19 AM Go to last post
  3. Comparing percentages

    Hi, this is my first post on here so I hope it's in the right place! I have been doing some research using a large hospital database. I want to...

    Started by lauri195‎, 07-18-2010 02:53 PM
    • Replies: 7
    • Views: 12,495
    07-19-2010, 07:48 PM Go to last post
  4. question about skewness and kurtosis

    I am in the process of screening my data. I ran the analyses on skewness and kurtosis and was wondering how one determines the significance of these...

    Started by psychologygirl‎, 03-27-2008 06:31 PM
    • Replies: 1
    • Views: 12,472
    03-28-2008, 07:55 AM Go to last post
  5. Anderson Darling Normality Test in Minitab... normality query?

    Hello! I hope someone out there can point me in the right direction over a query I have with my stats analysis of a project. I want to compare...

    Started by noodle‎, 03-25-2011 04:40 PM
    • Replies: 1
    • Views: 12,465
    11-21-2011, 04:14 PM Go to last post
  6. Question statistically significant; p-value; t-stat

    I have a dataset that produced the following for a second-order polynomial: 1st order (linear) coefficient: 1.1089994 1st order (linear)...

    Started by scantor145‎, 05-29-2008 02:43 PM
    • Replies: 3
    • Views: 12,464
    05-30-2008, 06:43 AM Go to last post
  7. correlation & regression

    Hello, I got a simple question, I am just confused because the notation is different from what I am used to, maybe you can help me to understand...

    Started by WeeG‎, 02-15-2010 03:38 PM
    • Replies: 6
    • Views: 12,438
    02-16-2010, 12:15 PM Go to last post
  8. Checking procedure for collapsing 5 point likert scale to 3 point

    Hi I would like to find out what is the correct procedure for doing so. That is, combining agree and strongly agree, combining disagree and strongly...

    Started by lyn1‎, 05-11-2008 11:10 PM
    • Replies: 0
    • Views: 12,427
    05-11-2008, 11:10 PM Go to last post
  9. List of recommended stats books

    Stats novice here but enthusiast. What would be a list of books you would expect any BS in statistics to have. I have my list culled from uiuc's...

    Started by tigerstripedcat‎, 01-12-2011 08:10 PM
    • Replies: 9
    • Views: 12,377
    01-16-2012, 02:10 PM Go to last post
  10. Help Needed with HLM and Power

    I am an I/O Psych PhD student and have never had the opportunity to learn about HLM, but I am going to use it in my thesis. I am looking for...

    Started by MariaS‎, 08-26-2009 12:44 PM
    • Replies: 3
    • Views: 12,357
    12-19-2013, 12:04 PM Go to last post
  11. Assumptions for principal component analysis?

    Hello all. I am performing a principal component analysis. In SPSS, I found that, in my data, KMO was only around 0.3, but the p value from...

    Started by xiaoyanhuang‎, 05-17-2011 02:19 PM
    • Replies: 3
    • Views: 12,355
    05-18-2011, 02:02 AM Go to last post
  12. importing csv files into R

    Hi I keep trying to import a csv file into R but keep getting the error "˙ţS", please can anyone tell me what I am doing wrong

    Started by niyinks‎, 11-28-2010 07:34 AM
    • Replies: 14
    • Views: 12,341
    06-02-2013, 05:16 PM Go to last post
  13. Concatenating Vector of Strings in R

    I have a vector (Label) of length 500 with first few elements as: AAA ABM ACD ADR I want to create a new vector (NewLabel) such that it's...

    Started by sak‎, 05-23-2011 07:24 PM
    strings concatenation
    • Replies: 7
    • Views: 12,339
    05-23-2011, 09:01 PM Go to last post
  14. what is the difference between variable and attributes in research

    Hi what is the difference between variable and attributes in research with example please :wave:

    Started by sanaa‎, 03-01-2008 11:11 PM
    • Replies: 2
    • Views: 12,323
    03-02-2008, 10:54 AM Go to last post
  15. comparing the DEGREE of difference between data sets

    Hi all, I'm wondering if there is a way to assess the degree of difference between data sets. For instance, say I have 4 groups of proportions (or...

    Started by psylocat‎, 01-06-2011 03:11 AM
    2 Pages
    1 2
    dissimiliarity measure, nmds, solved
    • Replies: 23
    • Views: 12,268
    01-14-2011, 02:34 AM Go to last post
  16. Thumbs up Calculating P-values in excel and ti-83

    I attached a excel anova table. Would you please point out which cells were used to calculate each p-value? I'm also trying to do this on my...

    Started by sweetheart‎, 08-08-2010 01:05 PM
    • Replies: 5
    • Views: 12,249
    08-08-2010, 05:18 PM Go to last post
  17. Granger Causality Test. Stationary or non-stationary data? (Eviews)

    Hi, Is it correct to use Granger Causality Tests on non-stationary, i(1), time-series? Or should I (log)difference my data first? I cannot...

    Started by Herbert‎, 04-21-2011 10:55 AM
    • Replies: 1
    • Views: 12,207
    06-11-2012, 12:30 PM Go to last post
  18. Large sample size - not normally distributed - what now?

    Hello Everyone, I'm looking to get some advice on what statistical method is most appropriate for the question I'm trying to answer - if I even...

    Started by SuzanneMonette‎, 10-25-2010 09:44 AM
    • Replies: 14
    • Views: 12,192
    10-26-2010, 02:18 PM Go to last post
  19. How to check if results statistically significant?

    Hi all, I am a novice when it comes to statistics and would really appreciate some advice! I created a teaching video for students on a...

    Started by auzz84‎, 05-04-2010 04:17 PM
    • Replies: 4
    • Views: 12,179
    05-06-2010, 08:00 PM Go to last post
  20. proc reg vs. proc genmod

    How do you decide which one to use? I noticed genmod didn't give me an R^2.:confused: You can't give a class statement with proc reg but if you...

    Started by StatsClue‎, 01-01-2012 04:25 PM
    • Replies: 7
    • Views: 12,175
    02-01-2016, 01:08 PM Go to last post
  21. within groups variance higher than between groups variance

    If I was doing a study to see if a treatment causes a significant effect, what would it mean if within groups variance was higher than between groups...

    Started by mikeharp‎, 09-16-2011 11:14 PM
    • Replies: 1
    • Views: 12,169
    09-19-2011, 07:40 AM Go to last post
  22. correlation and pvalue

    Hi, the Ho hypothesis for cor.test in R is: There is no correlation / there is no correlation equal to 0. H1: true correlation is not equal to...

    Started by beginner‎, 01-18-2010 01:37 PM
    • Replies: 3
    • Views: 12,132
    01-19-2010, 04:52 AM Go to last post
  23. Help with Statistics

    I am having a hard time with the problem. I can compute the midpoint X, Frequency (f), and the xf, however, I am having trouble with the xbar and...

    Started by Cece524‎, 08-12-2008 05:25 PM
    • Replies: 1
    • Views: 12,120
    08-12-2008, 11:55 PM Go to last post
  24. Which is most affected by variations in extreme scores?

    Hi, I take an exam previous week and I could not agree the instructors solution to one question. Here is the question: Which of the following...

    Started by bilgedama‎, 11-13-2009 10:47 PM
    • Replies: 1
    • Views: 12,092
    12-18-2009, 12:56 AM Go to last post
  25. Deming regression interpretation

    Hi there, Are there any stats people here who have used Deming's regression before. For analysis of two different assays I used Deming...

    Started by placebo‎, 09-15-2008 12:00 AM
    • Replies: 4
    • Views: 12,075
    09-16-2008, 03:31 AM Go to last post
  26. Outlier

    Hallo! I have the following problem: I have this data 44 41 90 55

    Started by Hubert12‎, 10-08-2010 05:59 AM
    • Replies: 6
    • Views: 12,066
    09-29-2014, 12:31 AM Go to last post
  27. Significant omnibus test of model coefficients & significant Hosmer Lemeshow

    Hello, I've gotten some logistic regression results that I've never encountered before. The omnibus tests of model coefficients is significant...

    Started by student1‎, 12-09-2009 02:36 PM
    • Replies: 0
    • Views: 12,045
    12-09-2009, 02:36 PM Go to last post
  28. Use the frequency distribution to find...

    class width class midpoints class boundaries I was given the following information on "tree height" class ...

    Started by BROOKIREDD‎, 04-02-2011 09:51 AM
    • Replies: 5
    • Views: 12,014
    04-02-2011, 01:32 PM Go to last post
  29. Question Power Analysis for MANOVA and ANOVAS - Please help, going mental!

    Dear All I am going nuts trying to work this out.... I'm a Psych. grad student trying to check to see what sample size I would need in the...

    Started by clairealexia‎, 02-05-2007 05:00 AM
    • Replies: 1
    • Views: 12,009
    02-07-2007, 04:57 PM Go to last post
  30. Fixing a threshold to create contingency tables for Cochran–Mantel–Haenszel test

    I have two continuous variables, X, and Y, and create their contingency table by using the median of each variable as a threshold. I repeat this...

    Started by nogale‎, 02-11-2013 03:22 AM
    contingency tables, mantel–haenszel test, threshold
    • Replies: 0
    • Views: 11,984
    02-11-2013, 03:22 AM Go to last post
  31. ANOVA with percentages

    Hello -- I'm looking for some guidance on how to make my percentage data appropriate for ANOVA. Here is what I have: The dependent variable is a...

    Started by marika‎, 01-11-2013 02:44 PM
    • Replies: 10
    • Views: 11,978
    01-13-2013, 02:20 PM Go to last post
  32. Intraclass correlation: non-negative or from -1 to +1??

    The published literature includes accounts of the theory of intraclass correlation (ICC) in which it must be non-negative and other accounts where it...

    Started by pjt111‎, 03-07-2009 01:45 PM
    • Replies: 4
    • Views: 11,952
    03-07-2009, 09:06 PM Go to last post
  33. How to prove that the expectation and variance of a Poisson random variable = lambda?

    This probably has an easy solution, but I was wondering if anybody could help me solve and explain these two questions: (a) Show that the...

    Started by mh03‎, 08-02-2012 06:31 AM
    expectation, poisson, proof, variance
    • Replies: 3
    • Views: 11,938
    08-02-2012, 10:13 AM Go to last post
  34. Converting Effect Size Eta-Squared to dz

    Hi, I've been using G*Power to perform power analyses. For within-subject t-tests. G*Power requires you to specify the effect size in the form dz...

    Started by RyanBScott‎, 03-05-2008 09:51 AM
    • Replies: 0
    • Views: 11,934
    03-05-2008, 09:51 AM Go to last post
  35. Wink Food service satisfaction survey - 4 point Likert scale

    Good morning, This is my first posting... I am a dietitian with a master degree. I am doing research in Clientele satisfaction (i.e. quality of...

    Started by Isabelle‎, 09-25-2006 09:13 AM
    • Replies: 3
    • Views: 11,932
    09-25-2006, 02:40 PM Go to last post
  36. Unhappy Pearson's r or r squared?

    Hi I've partly completed the statistical work required for my research, however, I'm struggling a little bit with Pearson's r and indeed whether I...

    Started by go_rators‎, 03-26-2009 06:12 PM
    • Replies: 1
    • Views: 11,919
    11-08-2009, 02:58 PM Go to last post
  37. T-test applicable with exponentially distributed samples?

    Hi I have a few datasets of quality ratings for different producers (i.e. x1 ratings for producer y1, x2 ratings for producer y2 etc). The ratings...

    Started by axs‎, 12-20-2010 03:09 PM
    • Replies: 4
    • Views: 11,917
    03-24-2011, 07:48 PM Go to last post
  38. Chi-square - repeated measures?

    Hi all, So I thought I had worked out what to do with my data....but having just read Andy Fields stats book (my bible!) I think I might have a...

    Started by statto‎, 03-31-2010 12:50 PM
    • Replies: 3
    • Views: 11,914
    03-31-2010, 08:51 PM Go to last post
  39. Binary mixed-model logistic regression using lmer() of lme4 for multilevel analysis

    In my experiment, each patient has been observed twice, once using placebo and the other time using the real treatment. I want to assess the...

    Started by victorxstc‎, 08-24-2013 04:56 PM
    2 Pages
    1 2
    generalized linear model, mixed effects model, mixed effects models, mixed model
    • Replies: 15
    • Views: 11,913
    08-27-2013, 04:07 PM Go to last post
  40. Statistics in layman's terms. Does it exist?

    Can anyone direct me to any online/book sources that would explain statistics in, well, layman's terms? I just started Stats II and am having an...

    Started by tess86‎, 01-13-2012 05:06 PM
    • Replies: 2
    • Views: 11,912
    01-13-2012, 06:56 PM Go to last post
  41. two-sample t-test and non-normal data

    Hi all, :wave: I am aware that the two sample t-test is pretty robust when it comes to nonnormaility of populations means (especially when n is...

    Started by Mistaken‎, 07-08-2010 12:46 PM
    • Replies: 4
    • Views: 11,897
    07-09-2010, 10:13 AM Go to last post
  42. Why does sample std dev underestimate population std dev?

    The subject line is too short for me to word out my question properly: Why does (square root of unbiased estimator for population variance)...

    Started by johnc‎, 02-08-2012 12:02 AM
    deviation, jensen's inequality, standard, variance
    • Replies: 10
    • Views: 11,866
    05-08-2012, 09:38 AM Go to last post
  43. Question t critical values

    Just wondering Does anyone out there know a formula for calculating t critical values using df=n without using a table for whatever confidence...

    Started by chikenwing‎, 04-29-2008 03:24 PM
    • Replies: 1
    • Views: 11,864
    04-30-2008, 02:25 AM Go to last post
  44. confused about the class interval

    hey, first of all - im from germany, sry if my english is not perfect :) ive got a problem with the class intervals... a little example: ...

    Started by Sina20‎, 01-11-2012 06:02 PM
    class, interval, size
    • Replies: 0
    • Views: 11,858
    01-11-2012, 06:02 PM Go to last post
  45. R squared and causation

    Quick (probably elementary ) ques: If linear regression doesn't prove causation, why is it that we say that R-squared shows "the amount a...

    Started by stevedas‎, 09-05-2011 11:58 PM
    • Replies: 6
    • Views: 11,832
    09-07-2011, 02:32 AM Go to last post
  46. U shaped relationship

    Is it appropriate to test for the existence of a U shaped dose response relationship between using logisitic regression (because I have a dichotomous...

    Started by sk0412‎, 03-03-2010 12:24 AM
    • Replies: 1
    • Views: 11,820
    03-04-2010, 02:29 AM Go to last post
  47. Non-Parametric Dunnett's Post HOC test?

    I was wondering if you can run a Dunnett's Control test on non-parametric data. I tried everything I could to transform my data (species diversity...

    Started by KappaBeast‎, 05-01-2009 06:06 PM
    • Replies: 2
    • Views: 11,807
    05-01-2009, 07:01 PM Go to last post
  48. Question Odds Ratio (with interactions in Logistics Regression)

    the following shows my logistics regression fitted model with interactions: p = 1/ (1+exp {-0.377 + 0.0933*x1 - 0.463*X2 + 0.0259*X3 +...

    Started by zellle‎, 08-11-2010 11:16 AM
    • Replies: 11
    • Views: 11,795
    08-16-2010, 11:09 AM Go to last post
  49. Testing the utility of a model with F-test and T-test

    Hello, I just needed some help understanding some concepts. To test a first order model with several predictor variables, you use the F test. I...

    Started by Stickstat‎, 05-08-2012 05:13 PM
    • Replies: 10
    • Views: 11,790
    05-09-2012, 01:39 PM Go to last post
  50. Degrees of Freedom

    Hello, I want to explain the meaning of degrees of freedom to people that are not mathematicians. What should i tell them? More specifically i...

    Started by zarasandreas‎, 02-04-2010 06:36 AM
    • Replies: 9
    • Views: 11,774
    07-15-2015, 09:00 AM Go to last post
  51. Pearson Chi Square test on Extremely large sample size

    Hi guys I am new to this forum. I am working with Pearson Chi-square statistics when I run into a problem. I have a sample size of 89000 and I...

    Started by kyletan‎, 02-22-2013 01:31 PM
    large sample size, pearson chi square test
    • Replies: 4
    • Views: 11,756
    02-22-2013, 04:03 PM Go to last post
  52. standard deviation of a sampling distribution

    Hello. When I wanted to solve a exercise (also homework) I figured out that I have a serious problem of understanding a concept. I don’t want you to...

    Started by Columbia_Zero‎, 11-19-2011 01:45 AM
    • Replies: 5
    • Views: 11,734
    11-19-2011, 10:40 AM Go to last post
  53. Geometric CV

    Dear all, How to calculate Geometric CV for the following data. Please help me. 12,23,45,56,16,45,34,65,1,2 Thanks in Advance Bala

    Started by Bala‎, 10-15-2009 05:15 AM
    • Replies: 1
    • Views: 11,712
    10-15-2009, 06:37 AM Go to last post
  54. Which alpha level do I choose?

    Hi everyone! I am currently taking a statistics course for my B.A. in sociology and I am having trouble understanding how to choose the alpha...

    Started by sscott4775‎, 11-03-2011 02:55 AM
    • Replies: 1
    • Views: 11,708
    11-03-2011, 03:57 AM Go to last post
  55. Finding Probability Xbar?

    Suppose a simple random sample of size n = 38 is obtained from a population of Mean = 66 and Standard Deviation = 19 a) P(x-bar < 69.9) b)...

    Started by greenpumpkins‎, 11-03-2008 09:15 PM
    • Replies: 1
    • Views: 11,687
    11-04-2008, 01:53 PM Go to last post
  56. Confidence Interval problem

    Hello all, I need some help with the following question. Any assistance would be greatly appreciated. The Crossett Trucking Company claims...

    Started by primeo81‎, 12-07-2009 06:04 PM
    • Replies: 1
    • Views: 11,687
    12-08-2009, 03:46 AM Go to last post
  57. Correlation dependent on slope?

    Hi, before I start to explain my problem please first have a look at the correlation wikipedia article Correlation. The image on the very right...

    Started by beginner‎, 01-26-2010 10:12 AM
    • Replies: 2
    • Views: 11,650
    01-27-2010, 03:15 AM Go to last post
  58. How to determine if change in survey data is significant?

    I have two successive years of customer survey data in which we ask our customers to score us between 1 and 5 on our performance in a number of...

    Started by glenwroberts‎, 12-28-2009 11:25 AM
    • Replies: 1
    • Views: 11,637
    12-28-2009, 11:54 AM Go to last post
  59. 2-way ANOVA Normality Requirements

    Greetings, My objective is to conduct a 2-way anova (equal sample sizes/246 samples) in R. After running the Shapiro-Wilk normality test on the...

    Started by Ben Packard‎, 07-30-2012 03:48 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 11,611
    08-03-2012, 05:13 PM Go to last post
  60. SPSS: in regression test interaction between a continuous and a within subjects var

    I have a SPSS analysis question regarding how to use regression to test for a moderator in a 2 x 2 design when the 2 x 2 design has both a between...

    Started by helwegm‎, 09-05-2008 12:47 PM
    • Replies: 2
    • Views: 11,609
    09-22-2008, 04:13 PM Go to last post

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