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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: 196,833
    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: 66,799
    09-30-2005, 09:44 AM Go to last post
  1. 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: 17,050
    01-30-2006, 07:11 PM Go to last post
  2. ANOVA table, f ratio and mean squares

    Hi, Here is my ANOVA table from a nested ANOVA, Treatment and year are fixed. ...

    Started by mixmaster‎, 07-29-2008 04:41 AM
    • Replies: 2
    • Views: 17,026
    07-30-2008, 03:36 AM Go to last post
  3. The weights of newborn children

    Could someone please check my answer? The weights of newborn children in the United States vary according to the normal distribution with mean 7.5...

    Started by Jerryberry‎, 01-15-2006 11:26 PM
    • Replies: 1
    • Views: 17,016
    01-16-2006, 10:01 AM Go to last post
  4. How to deal with bimodal distributions in SPSS?

    I ran a psychology study in which kids watched 1 of 4 cartoons, and then performed 3 tasks. On one of the tasks, I obtained a bimodal distribution. I...

    Started by Amandabeth‎, 07-28-2012 03:20 PM
    bimodality, linear regression
    • Replies: 4
    • Views: 17,016
    07-28-2012, 05:12 PM Go to last post
  5. how to calculate the appropriate sample size

    Dear teachers, I do appreciate if you can help me! I am a nursing student from Hong Kong, I need to design a study for my year end project. ...

    Started by ibm9999‎, 05-20-2008 09:55 AM
    • Replies: 4
    • Views: 17,000
    05-23-2008, 12:38 PM Go to last post
  6. factors vs covariates

    What's the difference between a factor and a covariate?

    Started by cc797‎, 02-18-2010 04:45 PM
    • Replies: 1
    • Views: 16,989
    02-19-2010, 01:01 AM Go to last post
  7. Minimizing the sum of squared error for a regression equation?

    I have two questions that I am hoping someone will be kind enough to help me out with. 1) Could someone please "translate" the following...

    Started by stud40111‎, 09-26-2010 01:17 PM
    • Replies: 5
    • Views: 16,988
    10-07-2010, 11:40 PM Go to last post
  8. Unhappy More than two values for a dummy variable (regression)?

    How do I deal with the case where I am dealing with more than two values for a dummy variable when doing regression? I know that if there are 2...

    Started by david_q‎, 01-28-2012 03:07 AM
    • Replies: 11
    • Views: 16,984
    01-31-2012, 02:16 PM Go to last post
  9. Yes/No Questionnaire Analysis

    Hey all. I'm having issues trying to figure out how to record and analyze some data I've collected. Here's the short story: 8 kids took before and...

    Started by Akelly1‎, 05-06-2012 08:40 PM
    • Replies: 9
    • Views: 16,937
    05-08-2012, 05:36 PM Go to last post
  10. Correlation between dichotomous and ordinal variables

    Hi everyone, I am very thankful for your feedback on my eventually simple question: I want to calculate the correlation between a dichotomous...

    Started by ldwg‎, 06-15-2011 08:01 AM
    correlation, dichotomous iv, ordinal dv
    • Replies: 8
    • Views: 16,909
    06-24-2011, 06:41 AM Go to last post
  11. Small sample size - an alternative to multiple regression analysis??

    Hi all, I really hope someone can help me. I am investigating the relationship between school variables (7 factors) on teacher job satisfaction (3...

    Started by cailin6‎, 10-11-2013 01:06 PM
    • Replies: 5
    • Views: 16,866
    10-13-2013, 10:56 AM Go to last post
  12. Sample Size Calculation

    Hello guys, I am new to this forum, and I was asked by my boss at work to calculate a sample size. I have been out of statistics for several...

    Started by razielmgs‎, 09-28-2010 10:22 AM
    • Replies: 3
    • Views: 16,845
    09-30-2010, 09:29 AM Go to last post
  13. Confidence Interval: Adjusted Wald Method

    If I am conducting an experiment on 10 people and all 10 performed a task successfully, I want to know how to determine the confidence interval. I...

    Started by erand‎, 12-12-2006 12:11 PM
    • Replies: 4
    • Views: 16,825
    12-12-2006, 04:59 PM Go to last post
  14. Calculating intrasubject variability

    I'm wondering which is the proper approach for an assessment of intrasubject variabilty. I have a series of patients of whom I have taken a...

    Started by placebo‎, 09-25-2008 05:08 AM
    • Replies: 6
    • Views: 16,797
    09-30-2008, 01:53 PM Go to last post
  15. Calculating Wald test statistic (Excel)

    Hi everyone, please refer to the attached file below. I would like to test for the significance of the autocorrelation coefficients for a time...

    Started by fboehlandt‎, 01-20-2010 07:08 AM
    • Replies: 0
    • Views: 16,783
    01-20-2010, 07:08 AM Go to last post
  16. P value/T distribution chart question

    Thank you for taking the time to read my query. I appreciate it. For my class, we have to find the p values by hand. We look them up in the z, t...

    Started by ealeql‎, 11-01-2010 09:37 AM
    • Replies: 8
    • Views: 16,777
    11-02-2010, 05:35 PM Go to last post
  17. Regression diagnostics with proc glm or proc reg

    I fit my model using 'proc glm' but now it seems that proc reg should be used for the diagnostics. So, do I need to fit the model all over again...

    Started by StatsClue‎, 02-06-2012 04:04 PM
    2 Pages
    1 2
    regression diagnostics
    • Replies: 28
    • Views: 16,774
    02-13-2012, 01:43 PM Go to last post
  18. dissertation help please...signal detection and d-prime alternative?

    Hi! Ive just conducted my analysis for my dissertation and im worried i have done it completely wrong. this is the basic design: 2 stages; 1....

    Started by loobie‎, 03-18-2008 05:30 PM
    • Replies: 2
    • Views: 16,743
    04-08-2008, 08:42 AM Go to last post
  19. Question one sample t-test --> nonparametric equivalent?

    Dear all, this is my first post in this forum, in which it seems many people find help and share insights :). Working on my MBA thesis, I might...

    Started by Astro Boy‎, 11-14-2008 03:39 PM
    • Replies: 7
    • Views: 16,706
    12-19-2011, 06:13 PM Go to last post
  20. Percentile of SAMPLE mean

    Can someone please explain to me how to work out the percentile of the sample mean (diff to confidence intervals which is pop mean) The Q is: ...

    Started by kstone‎, 09-19-2012 10:26 PM
    • Replies: 8
    • Views: 16,704
    09-20-2012, 04:52 AM Go to last post
  21. p value interpretation in Mann-Kendall test

    Hi, I am performing a Mann-Kendall test on a set of a data. and I got a p value of 0.15 so it means the null hypothesis of NO TREND is not rejected....

    Started by Fred_a‎, 12-28-2012 03:38 PM
    mann-kendall, null hypothesis
    • Replies: 5
    • Views: 16,620
    07-03-2013, 01:06 AM Go to last post
  22. Sample size calculation for pilot study

    We are planning to do a study involving a new treatment that can reduce the size of the lesion by 20% on average but the range is expected to be...

    Started by eyevic‎, 02-27-2010 08:34 PM
    • Replies: 3
    • Views: 16,608
    03-02-2010, 06:30 AM Go to last post
  23. library does not exist

    Hi , I wrote a short code that create the library called test and creates the dataset account in it . But when I run it in SAS , I get ERROR...

    Started by masterinex‎, 01-09-2010 05:23 PM
    • Replies: 2
    • Views: 16,605
    01-14-2010, 09:20 PM Go to last post
  24. Probability of getting 13 of the same suit

    Hello! I'm trying to figure out how to calculate the odds of being dealt 13 cards of the same suit out of a standard 52 card deck. Example: Say...

    Started by datune‎, 02-27-2009 02:56 PM
    • Replies: 11
    • Views: 16,576
    03-01-2009, 11:27 AM Go to last post
  25. Comparing mean of 3 samples

    Hi I wonder if anybody would be so kind as to help me with a problem. I am a paediatrician looking at weight change after 12 months of treatment...

    Started by Andrew!‎, 09-10-2008 05:02 PM
    • Replies: 5
    • Views: 16,554
    09-16-2008, 03:13 AM Go to last post
  26. One-group pretest-posttest analysis?

    Hello all, Experimental design: 8 subjects, each run through 6 identical trials in a pre-test. Measures were collected from each trial. Each...

    Started by FoosJunkie‎, 04-02-2010 03:46 PM
    • Replies: 1
    • Views: 16,517
    04-02-2010, 06:28 PM Go to last post
  27. Question Within-subject and between subject-variability

    Dear experts and users: I was instructed to calculate the within-subject and between subject variability of a data set from one of my PIs. I would...

    Started by wnjiang‎, 07-03-2012 12:43 AM
    between-subject, variability, within-subjects
    • Replies: 4
    • Views: 16,511
    07-03-2012, 01:13 PM Go to last post
  28. Help...Quebec Separation? Oui ou Non

    Since the 1960s, there has been an ongoing campaign among Quebecers to separate from Canada and form an independent nation. Should Quebec separate,...

    Started by daniel7lu‎, 11-06-2009 05:55 PM
    3 Pages
    1 2 3
    • Replies: 44
    • Views: 16,400
    11-15-2009, 07:07 PM Go to last post
  29. Help: Unbiasedness and Consistency

    Hi all, Does unbiased estimator necessary means that the estimator is also consistent? Since expected value of unbiased estimator equals...

    Started by sampahmel‎, 12-14-2008 03:24 PM
    • Replies: 5
    • Views: 16,397
    12-15-2008, 02:30 PM Go to last post
  30. Lightbulb p-values - what is trend level?

    I am using an alpha of .05 as to indicate significance. My advisor considers values over .1 as trend-level p-values. I understand that we can...

    Started by CBABD‎, 08-18-2006 05:56 PM
    • Replies: 2
    • Views: 16,327
    01-17-2011, 01:53 AM Go to last post
  31. Warning message in Regression analysis

    Hi there, I am working on my stats for my masters degree and am running a regression and receive the following message: "For models with your...

    Started by LearningStats6‎, 01-09-2010 07:49 PM
    • Replies: 7
    • Views: 16,265
    01-10-2010, 11:26 AM Go to last post
  32. Meaning of basic stats abbreviations

    I'm not a student, I'm a writer and I'm attempting to read some raw statistics and have no idea what the numbers mean. Could someone please put in...

    Started by abbynormal‎, 11-05-2007 06:50 PM
    • Replies: 5
    • Views: 16,259
    11-07-2007, 08:05 PM Go to last post
  33. Calculating alpha and power

    A box contains 20 balls, some red and some black. We want to test the hypotheses: Null: there are exactly 4 red balls in the box. Alternative:...

    Started by drippydrop22‎, 10-08-2011 03:53 PM
    • Replies: 14
    • Views: 16,226
    10-09-2011, 03:47 PM Go to last post
  34. Question G*Power Sample Size Calculation

    Hi Everyone, First, let me say that I am thrilled to find this forum! It has been a while since I have taken Stats I and II, and I will be the...

    Started by LadyM‎, 07-11-2012 11:05 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 16,202
    07-16-2012, 03:59 PM Go to last post
  35. probability of sample mean given population mean and SD

    I'm doing a worksheet for homework in my statistics class and have the following question: The population mean annual salary for plumbers is...

    Started by freckles‎, 11-18-2010 12:05 PM
    • Replies: 3
    • Views: 16,185
    11-18-2010, 02:39 PM Go to last post
  36. Exclamation Statistical analysis for likert type scale

    Hey, please help! I am currently analysing data from a likert scale, descriptive stats not a problem, it is the inferential stats im having a problem...

    Started by mariapsychnightmare‎, 04-23-2006 07:03 PM
    • Replies: 6
    • Views: 16,151
    04-24-2006, 08:27 PM Go to last post
  37. XTLOGIT - interpreting odds ratio. Am I on the right track??????

    I ran an xtlogit model on my panel data. Dependent variable: whether ppl adhere to the program or not (0 do not adhere 1 adhere) Independent...

    Started by berry16‎, 01-05-2012 12:52 AM
    • Replies: 14
    • Views: 16,148
    01-08-2012, 06:20 PM Go to last post
  38. How to test normal distribution

    Hi all I have a set of data and want to test is it normal distributed or not? How can I do it? Thanks Daniel

    Started by daniel‎, 09-14-2007 12:56 PM
    • Replies: 5
    • Views: 16,142
    09-20-2007, 03:28 PM Go to last post
  39. Effect size for Wilcoxon Signed Rank

    1) i want to calculate the effect size for wilcoxon signed rank (paired sample). I have one group of 10 participants. I know the formula for the...

    Started by lynnar‎, 01-22-2012 08:05 PM
    effect size, non parametric
    • Replies: 10
    • Views: 16,025
    01-04-2013, 04:02 PM Go to last post
  40. Comparing sample with normative data

    Problem: I will have survey results for a largish sample (n>300) and want to compare how different their scores are to established norms. The norms...

    Started by mrg‎, 07-06-2009 05:30 PM
    • Replies: 14
    • Views: 15,971
    07-17-2009, 04:10 AM Go to last post
  41. Ryan-Joiner test for normality ('by hand' in excel)

    Hi, I can't seem to get the correct Ryan-Joiner test statistic with this data (see attached). In Minitab it gives RJ: 0.998, p>0.100 I'm...

    Started by Silvanus‎, 09-07-2008 09:02 PM
    • Replies: 3
    • Views: 15,904
    07-14-2013, 06:09 AM Go to last post
  42. Coke vs. Pepsi Project Help

    Hello everyone, I have been assigned a statistics project in which we were to conduct a hypothesis test and were asked to poll 50 people and record...

    Started by optic08‎, 03-26-2008 04:35 PM
    • Replies: 5
    • Views: 15,840
    10-12-2008, 01:31 AM Go to last post
  43. t-e test p value interpretation

    Hi All *N.b. title should read t-test* 1st post, I need some help interpreting the results of a t-test. I understand that t-tests normally only...

    Started by ATaylor‎, 07-15-2008 05:32 PM
    • Replies: 2
    • Views: 15,827
    07-15-2008, 07:32 PM Go to last post
  44. Can someone explain the standardized residual formula for me?

    For simple linear regression: (Yi-Yihat)/(s*sqrt(1-pii)) where p is the ith diagonal element of projection matrix P. Yi is the observed value,...

    Started by hehe1223‎, 12-04-2010 02:18 PM
    • Replies: 4
    • Views: 15,827
    12-04-2010, 09:37 PM Go to last post
  45. using ti 84 plus for standard normal distribution

    Hi does anyone know how to find the probabily if the mean is 0 and the standard deviato is 1 , less than -1? what buttons on the ti 84 do i...

    Started by chrischemma‎, 06-20-2009 05:58 PM
    • Replies: 2
    • Views: 15,823
    06-20-2009, 11:57 PM Go to last post
  46. finding percentile

    HI can someone help me set this up to solve. i know i had missed this on one my previous exam, and trying to study for tomorrow final exam. ...

    Started by chrischemma‎, 07-02-2009 01:54 AM
    • Replies: 4
    • Views: 15,806
    07-05-2009, 10:28 PM Go to last post
  47. Hypothesis Testing involving Poisson Distribution

    Hi, Could anybody help me solving it? I am sure how to do a hypothesis test of Poisson distribution with small sample. A person will decide to...

    Started by marsuconn‎, 11-06-2009 09:43 AM
    • Replies: 3
    • Views: 15,669
    11-07-2009, 12:07 PM Go to last post
  48. Computing Z scores

    I am doing homework and i can't seem to figure out the correct answer. Question: Men vs. Women The average 20 - 29 year old man is...

    Started by sophieb‎, 02-26-2006 06:00 PM
    • Replies: 1
    • Views: 15,624
    02-26-2006, 06:07 PM Go to last post
  49. construct a confidence interval

    Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (The Wall...

    Started by USMstudent85‎, 05-02-2011 10:37 AM
    • Replies: 2
    • Views: 15,453
    05-03-2011, 01:18 AM Go to last post
  50. P- Values, Critical Values, Test Value

    I'm having major issues with these, can anyone point me in the right direction?? A recent study claims that business travelers spend an average of...

    Started by trailrider81888‎, 11-06-2008 08:16 PM
    • Replies: 2
    • Views: 15,447
    11-06-2008, 10:38 PM Go to last post
  51. Question Power Analysis for Factorial ANOVA Design?

    Hello, I have the following experimental design: Dependent Variable: time taken for task Independent Variables: task difficulty(2), device...

    Started by firefly2442‎, 05-18-2011 03:01 PM
    anova, gpower3, number of participants, power analysis
    • Replies: 2
    • Views: 15,425
    06-30-2011, 12:32 PM Go to last post
  52. Post Higher order interaction in Four-way ANOVA

    I have performed a four-way ANOVA ( four random independant variables and one dependant variable). On performing analysis, I founf out that four-way...

    Started by Tausif‎, 08-31-2011 12:49 PM
    • Replies: 2
    • Views: 15,386
    08-31-2011, 01:08 PM Go to last post
  53. Mean Square Error in Excel

    completely desperate...need to calculate the mean square error (MSE) for my master thesis (in order to run a standardized t-test) and somehow I just...

    Started by bella_85‎, 11-11-2009 05:05 AM
    • Replies: 1
    • Views: 15,355
    11-11-2009, 09:26 AM Go to last post
  54. Standard Deviation of a Weighted Mean

    Does anyone know how to calculate the standard deviation of a weighted mean? v p(v) 0 0.3 1 0.4 2 0.3 I need to calculate the...

    Started by anemro‎, 07-26-2008 10:57 PM
    • Replies: 6
    • Views: 15,175
    07-28-2008, 01:41 PM Go to last post
  55. Excel regression output Anova table

    Hi all, In the attached regression theres a value for standard error at the top of the summary output and specific standard error values assigned...

    Started by rwd5013‎, 06-21-2010 12:32 PM
    • Replies: 3
    • Views: 15,165
    06-22-2010, 09:19 AM Go to last post
  56. adjusted residuals or standardized residuals?

    Hi, I am performing chi-square analyses for my dissertation data and am wondering about appropriate "post-hoc" analyses when chi-square values are...

    Started by rydingray‎, 06-21-2006 09:19 AM
    • Replies: 2
    • Views: 15,104
    06-27-2006, 03:58 PM Go to last post
  57. Shapiro-Wilk test for large samples

    Hi all, does anyone know a routine with which to calculate the Shapiro-Wilk test statistic and corresponding p-values for sample sizes of >10000?...

    Started by choschech‎, 03-22-2010 04:36 PM
    • Replies: 7
    • Views: 15,080
    03-25-2010, 04:21 PM Go to last post
  58. what is quasibinomial distribution?

    I've done some search, but still can't understand what quasibionmial distribution is. Can anyone give me an intuitive explanation? What is a...

    Started by youngukoo‎, 06-20-2013 02:05 AM
    quasi
    • Replies: 3
    • Views: 15,039
    02-21-2017, 06:26 PM Go to last post
  59. Excel TTEST() vs Excel DataAnalysis\t-test

    Hi, A while ago I had to compare an old and new punch tool using t-tests. I did the sums manually (as Excels DataAnalysis tool pack, which I...

    Started by fiducial‎, 02-01-2008 01:18 AM
    • Replies: 5
    • Views: 15,036
    02-06-2008, 01:49 PM Go to last post
  60. Test of significance with discrete binary data

    Hello all, I'm new to the forum. Please excuse me if the following question has been answered before. A search of the forum did not yield the...

    Started by joe7987‎, 07-05-2012 03:45 PM
    • Replies: 5
    • Views: 14,958
    07-09-2012, 08:40 AM Go to last post

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