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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: 160,268
    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: 49,213
    09-30-2005, 09:44 AM Go to last post
  1. Accounting for other variables when looking for main effects (regression)

    I am doing a negative binomial regression, to look for interactions between categorical and continuous predictors. I am currently reporting main...

    Started by TruroJP‎, 03-25-2017 02:33 PM
    effect, main effects, regression, simple effects
    • Replies: 2
    • Views: 327
    Today, 11:16 AM Go to last post
  2. SPSS - Two-Way Repeated Measures ANOVA correct?

    Hi everyone, I was hoping someone could help me out in regards to my methods of analysis. The following experiment setup was a randomised placebo...

    Started by JK95‎, Yesterday 06:52 PM
    • Replies: 1
    • Views: 74
    Today, 08:36 AM Go to last post
  3. F Change Test and ANCOVA

    Given R squared between the DV and covariant, R squared between the DV and treatment (two groups), R squared between DV and covariant treatment...

    Started by mcamigo333‎, Yesterday 07:12 PM
    ancova, f test
    • Replies: 1
    • Views: 93
    Yesterday, 10:00 PM Go to last post
  4. How to interpret Tukey's Test results?

    I know how to interpret plot (a) but I am confused about plot (b) with the Tukey's Results... they don't seem like any of the results i've found...

    Started by jki‎, Yesterday 06:28 PM
    • Replies: 1
    • Views: 65
    Yesterday, 06:54 PM Go to last post
  5. mediation results are not in line with compression of glmm consisted models

    hi all, I'll begin with my two question and all the related information (description of the research and the data and full output) will follow. ...

    Started by uriblasbalgg‎, Yesterday 09:07 AM
    generalized mixed models, mediation
    • Replies: 0
    • Views: 64
    Yesterday, 09:07 AM Go to last post
  6. Comparing small differences in mean values while standard deviation is high...

    Hi, I'm sorry if this is a basic question and I'm also sorry for my cumbersome problem description. I guess I'm lacking some serious fundamentals...

    Started by Pipeline‎, 04-22-2017 03:19 PM
    • Replies: 1
    • Views: 116
    Yesterday, 04:39 AM Go to last post
  7. testing the bootstrap

    hi, below is an experiment I just did testing whether using a bootstrap I could get better results as with simple repetead sampling. Is there any...

    Started by rogojel‎, 04-21-2017 07:20 AM
    bootstrap simulation, sampling
    • Replies: 4
    • Views: 173
    04-21-2017, 11:36 AM Go to last post
  8. Smile Sign differences in coefficients arising from using ordinal vs continuous data

    I run a simple OLS regression: y=a +bx+.....+e, I obtain an estimate of b<0. Prior researchers running the a similar regression obtain an...

    Started by ecumto‎, 04-21-2017 07:47 AM
    linear regression, ordinal data, regression coefficient, statistics
    • Replies: 1
    • Views: 97
    04-21-2017, 08:34 AM Go to last post
  9. Two way ANOVA test?

    Hello every body, I am using SPSS for analyzing my data. The structure of the data composed of two independent variables: 1. Genotype (I have 8...

    Started by sharonin1‎, 04-21-2017 06:43 AM
    • Replies: 0
    • Views: 83
    04-21-2017, 06:43 AM Go to last post
  10. Credit Card Roulette Reverse Draw Questions

    My friends and I have been debating the statistics of a credit card roulette game (reverse draw) we play when the dinner bill arrives to see who pays...

    Started by sgraham88‎, 04-19-2017 05:43 PM
    credit card roulette, reverse draw odds
    • Replies: 6
    • Views: 246
    04-20-2017, 09:52 PM Go to last post
  11. Help with choosing the correct analysis method

    Hello, I have abit of a tricky question for you, but first some context. I carried out a study where students completed 2 sets of questions, and...

    Started by IronPineapple‎, 04-20-2017 04:38 PM
    analysis help, analysis method, graphpad, statistics
    • Replies: 0
    • Views: 138
    04-20-2017, 04:38 PM Go to last post
  12. Logistic Regression Interpretation

    I hope you are all having a good day. How would I interpret the coefficient on age in the following logistic regression (note that the coefficients...

    Started by smw10c‎, 04-19-2017 09:25 AM
    • Replies: 7
    • Views: 181
    04-20-2017, 11:17 AM Go to last post
  13. Extra credit/completely lost

    Okay so I'm completely lost on how to set the equations up on these proablems I know how to do all the calculations once they are set up but I have...

    Started by Jdiryawush19‎, 04-19-2017 04:17 PM
    • Replies: 0
    • Views: 140
    04-19-2017, 04:17 PM Go to last post
  14. Median Survival CI - SPSS vs Stata

    I've been generating some Kaplan Meier survial curves and the related stats. SPSS and Stata give me the same Median survival but very different 95%...

    Started by Maciej84‎, 04-18-2017 09:29 AM
    • Replies: 3
    • Views: 170
    04-19-2017, 12:38 PM Go to last post
  15. point-biserial correlation?

    Hi! I am doing my thesis about life-events (both positive and negative), social support and anxiety. I want to find out which types of...

    Started by Maggie123‎, 04-17-2017 12:43 PM
    • Replies: 3
    • Views: 173
    04-18-2017, 11:46 AM Go to last post
  16. Mediator transformation

    Recently, I carried out a questionnaire about the effect of a digital communication channel on willingness to buy a personalized advertised product....

    Started by BVDV‎, 04-18-2017 05:44 AM
    • Replies: 0
    • Views: 106
    04-18-2017, 05:44 AM Go to last post
  17. What statistical tests to analyse my data? ANOVA, correlation

    Hi everyone, I am really hoping someone can help me. I have my data all collected however I am really struggling how to analyse it. My supervisor...

    Started by gpmp1996‎, 04-17-2017 08:30 AM
    • Replies: 0
    • Views: 123
    04-17-2017, 08:30 AM Go to last post
  18. How do i analyse interaction in 3x2 ANOVA in SPSS

    Hi, i've discovered a significant interaction in my 3x2 ANOVA in my psychology dissertation (3x2 Between Subjects Design, using SPSS). I was...

    Started by UncleFisty665‎, 04-16-2017 01:41 PM
    anova, interaction, post hoc, psychology, spss
    • Replies: 0
    • Views: 134
    04-16-2017, 01:41 PM Go to last post
  19. Analyzing winrates between populations

    Hello! I am a graduate student and I have already completed my (very limited) statistics requirements for my field in undergrad. That is to say...

    Started by heavenlycolor‎, 04-14-2017 02:55 PM
    • Replies: 1
    • Views: 193
    04-16-2017, 12:39 PM Go to last post
  20. Cluster analysis with conjoint analysis data

    Hello everybody, My team and I have an assignment to run a conjoint analysis with SPSS. So far, we were able to make the orthogonal design to...

    Started by Thaosen‎, 04-14-2017 01:48 PM
    cluster, cluster analysis, conjoint analysis, spss
    • Replies: 8
    • Views: 264
    04-16-2017, 04:40 AM Go to last post
  21. Statified Sampling

    I have an N of 9780. I have two strata and am primarily interested in comparing the two. Strata A has 9490 or 97% of the population in it while...

    Started by Velma‎, 04-15-2017 03:46 PM
    • Replies: 4
    • Views: 208
    04-15-2017, 10:24 PM Go to last post
  22. Statistically significant changes in proportions - comparing 3 populations

    I have data from three populations, 2 observations each populations (opinion poll data from different countries). I am trying to find out if any...

    Started by sev1g14‎, 04-14-2017 01:18 PM
    percentages, proportions, statistical test, time
    • Replies: 3
    • Views: 196
    04-15-2017, 04:41 PM Go to last post
  23. spss nested two way ANOVA help

    Is there a way to do this in spss? I have 12 species within 2 functional groups. There are five treatments applied to each species for five...

    Started by new_user‎, 04-15-2017 03:40 PM
    • Replies: 0
    • Views: 118
    04-15-2017, 03:40 PM Go to last post
  24. Post Hoc test for Fisher's exact test

    Hello everyone! I have performed a Fisher's exact test (5X3 tables) and I have found statistically significant differences in my groups. How can I...

    Started by Curtains White‎, 04-11-2017 03:12 PM
    fisher's exact test, post hoc test
    • Replies: 1
    • Views: 242
    04-11-2017, 03:18 PM Go to last post
  25. [Sampling] Which type of sampling to use in this case

    I would appreciate any help in this case took from a book (without answers and tips): Consider that a court wishes to evaluate the proportion of...

    Started by Ardêncio‎, 04-11-2017 09:01 AM
    sampling
    • Replies: 4
    • Views: 206
    04-11-2017, 11:42 AM Go to last post
  26. Seeking Confidence levels on returned samples

    Hello all I've run a survey, asking organisations to returned a number of surveys based on the size of the population they work with. I've based...

    Started by Gribblor‎, 04-11-2017 09:14 AM
    • Replies: 0
    • Views: 128
    04-11-2017, 09:14 AM Go to last post
  27. p vs. r

    Sorry if this is a naive question, but its all a crash course for me... I am running a bivariate correlation in SPSS on some data. The Pearson...

    Started by leejones15‎, 04-08-2017 12:36 AM
    • Replies: 2
    • Views: 301
    04-08-2017, 07:39 PM Go to last post
  28. Normalizing data before calculating variation?

    Hello, We want to identify for which categories we need to differentiate in assortment over stores. We want to prioritize categories from highest...

    Started by Inge‎, 04-08-2017 01:52 AM
    normalised data, variability, variance
    • Replies: 0
    • Views: 237
    04-08-2017, 01:52 AM Go to last post
  29. Central Limit Theorem Help

    I am not quite sure what the questions are asking, do they want numbers or an explanation? Suppose you are interested in finding out how happy...

    Started by ocomin‎, 04-06-2017 04:11 PM
    • Replies: 3
    • Views: 332
    04-07-2017, 05:47 PM Go to last post
  30. Bootstrap method & Confidence Interval

    Hey, I'm trying to figure out how this method works. My data: - 1000 samples from unknown distribution. - I need to create 40 vectors from that...

    Started by bootstraper‎, 04-07-2017 02:38 PM
    • Replies: 0
    • Views: 178
    04-07-2017, 02:38 PM Go to last post
  31. Why normality assumption needed?

    I often see that for parametric tests one assumption is that the population should be normally distributed. However if I understand correctly the...

    Started by blubblub‎, 04-06-2017 07:23 AM
    normality test
    • Replies: 8
    • Views: 353
    04-06-2017, 02:13 PM Go to last post
  32. RIght test for nominal data analysis

    Hello folks, I am working with categorization of subjects in two different periods, and I want to test whether people migrated from categories or...

    Started by igorsteinmacher‎, 04-05-2017 11:16 AM
    • Replies: 5
    • Views: 422
    04-06-2017, 11:48 AM Go to last post
  33. Comparing pooled data

    I have started a meta analysis comparing the complication rates of different treatments of distal radius fractures. I have pooled the complication...

    Started by Rotterdam‎, 04-06-2017 09:29 AM
    • Replies: 0
    • Views: 199
    04-06-2017, 09:29 AM Go to last post
  34. Effect of a new in-store promotion

    I am measuring the effect of a new in-store promotion technique. This technique will be applied to 1000+ products over a period of time, in the...

    Started by KARPOS‎, 04-05-2017 09:51 AM
    • Replies: 0
    • Views: 247
    04-05-2017, 09:51 AM Go to last post
  35. Confidence interval for the standard deviation

    Hi, I'm using the typical formula SQRT(((N-1)*s^2)/(CHISQ.INV((1-Confidence)/2, N-1))). By mistake I entered a very low confidence and I noticed...

    Started by mgubellini‎, 04-04-2017 11:30 AM
    • Replies: 1
    • Views: 253
    04-04-2017, 12:28 PM Go to last post
  36. Bootstrap and hypothesis test

    Hi, I have to decide whether two groups have the same variance or not. My sample size is less then impressive, 13 data points per group. I ran...

    Started by rogojel‎, 04-04-2017 01:58 AM
    bartlett test, bootstrap, hypotheses testing, simulation
    • Replies: 2
    • Views: 255
    04-04-2017, 07:25 AM Go to last post
  37. Should I be using ANOVA?

    Hi, I haven't done statistics in just over a year so trying to read through old notes and feeling a bit stuck! I'm running an experiment looking at...

    Started by caitgracet‎, 04-04-2017 05:56 AM
    anova, correlation
    • Replies: 0
    • Views: 199
    04-04-2017, 05:56 AM Go to last post
  38. Sample size help

    Hi would really appreciate any help as I've spent nearly a day trying to work out what to do. I have two diagnostic tests looking and looking...

    Started by statsfail2‎, 04-01-2017 09:05 AM
    • Replies: 1
    • Views: 289
    04-03-2017, 03:51 PM Go to last post
  39. Parametric vs. Nonparametric.

    Suppose a researcher estimated a parameter in parametric way with correct distributional assumption. Another researcher estimated the same...

    Started by Cynderella‎, 04-01-2017 12:58 AM
    accuracy, inference, nonparametric, parametric data, unbiased estimator
    • Replies: 6
    • Views: 340
    04-03-2017, 12:06 PM Go to last post
  40. Hypothesis Testing

    I have 8 pre-test results and 8 post-test results but nothing identifying who took which test. How can i test to see if the post-test group feels...

    Started by kathleenem‎, 03-18-2017 05:03 PM
    hypothesis test
    • Replies: 1
    • Views: 444
    04-02-2017, 12:03 PM Go to last post
  41. X & Y not sig.correlated, but X predicts Y in SEM?

    Hi everyone, I'm wondering if any of you have run into this before - two variables, X & Y, are NOT significantly correlated in SPSS, but X...

    Started by BlueSky17‎, 04-02-2017 11:21 AM
    • Replies: 0
    • Views: 254
    04-02-2017, 11:21 AM Go to last post
  42. SPSS Statistics: Significant Differences between follow-up scores independent groups

    Hi, I have collected data on scores for a sample population before, 1 year after and 6 years after an intervention. All participants in the...

    Started by aa11‎, 04-02-2017 06:46 AM
    anova, mann whitneu u, missing data
    • Replies: 0
    • Views: 194
    04-02-2017, 06:46 AM Go to last post
  43. Which statistical test?

    Hi everyone, It's been a couple of years since I've taken a statistics class and I'm struggling to remember which test I should use. Essentially,...

    Started by cruiselife‎, 03-24-2017 05:15 PM
    • Replies: 3
    • Views: 439
    04-01-2017, 03:57 PM Go to last post
  44. Error in SPSS. homogeneity test

    Test of Homogeneity of Variancesa Sinusoid2.5Hz4 Levene Statistic df1 df2 Sig. .b 1 . . a Test of homogeneity of variances cannot be...

    Started by ycc25‎, 04-01-2017 03:28 PM
    • Replies: 0
    • Views: 229
    04-01-2017, 03:28 PM Go to last post
  45. Inputting scored questionnaires

    Please please please can someone help? I am doing my dissertation and I've got to put an ASQ (autistic spectrum questionnaire) in to SPSS but I don't...

    Started by LoobyLou‎, 04-01-2017 11:18 AM
    • Replies: 0
    • Views: 195
    04-01-2017, 11:18 AM Go to last post
  46. Sobel test in STATA with survey data

    Hi, I am trying to run a Sobel test for mediation on a panel database to test for significance of indirect effects in a mediation. My regress...

    Started by TruroJP‎, 03-31-2017 04:48 PM
    mediated moderation, mediating effect, regression, sobel
    • Replies: 0
    • Views: 288
    03-31-2017, 04:48 PM Go to last post
  47. Estimating a negative binomial curve, from sample size and mean

    Hey guys! Apologies for the potentially *stupid* question... I'm *very* rusty on my maths and am not getting anywhere with Google's support. ...

    Started by jmikulin‎, 03-31-2017 12:15 PM
    negative binomial, regression models
    • Replies: 0
    • Views: 198
    03-31-2017, 12:15 PM Go to last post
  48. Dichotomous test - posible to calculate the min number of 'positives' ?

    Hi, Is it possible to calculate the minimum number of positives (when I have 36 participants) for a dichotomous test at a 90% confidence level...

    Started by Linde‎, 03-26-2017 11:22 AM
    • Replies: 7
    • Views: 539
    03-30-2017, 06:26 PM Go to last post
  49. Cohen's Kappa Chance Calculation

    I am confused about the "total agreement by chance" calculation in Cohen's Kappa statistic. Say that Rater 1 agrees in 13/19 of the cases, and...

    Started by StilloftheNight‎, 03-29-2017 01:49 PM
    • Replies: 1
    • Views: 299
    03-29-2017, 02:07 PM Go to last post
  50. Medical Industry - 3 Dichotomous Indepedent Variables - ANOVA filtering

    Hi all, I have a data set with 3 proposed dichotomous independent variables: sex (male or female), side (left or right), and region (lower or...

    Started by JoshG‎, 03-28-2017 02:19 PM
    anova, filtering data, independent variable, multivariate analysis
    • Replies: 0
    • Views: 262
    03-28-2017, 02:19 PM Go to last post
  51. correlation between group/factor level & individual scores with group means and MSE

    Hi everyone, I've been working on this problem for a couple hours now, and I'm stumped. Essentially what we have are 4 groups of 25 people...

    Started by JeffreyWind‎, 03-28-2017 02:13 PM
    anova, correlation, group means, sums of squares
    • Replies: 0
    • Views: 199
    03-28-2017, 02:13 PM Go to last post
  52. Hypothesis testing and minitab

    Hi New to the site - I've managed 11 out of 13 questions for my final set of Master Black Belt homework but now stuck! Can anyone offer an...

    Started by heathermarie41‎, 03-28-2017 11:30 AM
    hypothesis testing, minitab, statistics
    • Replies: 3
    • Views: 290
    03-28-2017, 11:50 AM Go to last post
  53. Appropriate test for non-normal data with less than two groups?

    Hello, My question is about what kind of statistical test I can use with my data. I have two groups of 6 participants (one control group and one...

    Started by lv.hmltn‎, 03-23-2017 01:07 PM
    • Replies: 2
    • Views: 348
    03-28-2017, 04:19 AM Go to last post
  54. Regression, GLM or Contingency table or another type of model?

    Dear I'm doing a study where I need to research if X1/X2 has an increasing influence on Y when the educational level rises. Next to this I'm also...

    Started by Hypnoz‎, 03-25-2017 12:35 PM
    • Replies: 0
    • Views: 254
    03-25-2017, 12:35 PM Go to last post
  55. Reporting a significant interaction

    Hi! I am struggling on how to report a significant categorical x continuous interaction, which I found using a negative binomial regression. I...

    Started by TruroJP‎, 03-25-2017 08:44 AM
    • Replies: 0
    • Views: 298
    03-25-2017, 08:44 AM Go to last post
  56. What statistical test?

    Hi, I need to analyse a two type of scores about probabilty to die. Te first one, scores each case (hospitalization) in a ordinal scale (4...

    Started by Trindade_14‎, 03-24-2017 07:57 PM
    • Replies: 0
    • Views: 376
    03-24-2017, 07:57 PM Go to last post
  57. combinatorics question

    The letters of the word CONSTANTINOPLE are written on 14 cards, one on each card. The cards are shuffled and then arranged in a straight line: how...

    Started by Roohul Amin‎, 03-24-2017 01:34 PM
    • Replies: 1
    • Views: 350
    03-24-2017, 03:42 PM Go to last post
  58. Help! Econometrics

    Hi all, I am writing a research paper on intergovernmental funds. I would need to come up with a proper method for analysing my results. I have...

    Started by litenmarcus‎, 03-24-2017 04:01 AM
    • Replies: 1
    • Views: 296
    03-24-2017, 04:14 AM Go to last post
  59. One significant interaction out of many

    So I am in the process of interpreting a set of results. I conducted 6 regression analyses to determine if a variable acts as a moderator. One of...

    Started by TruroJP‎, 03-23-2017 06:25 PM
    interaction effect, interaction effects, interpret, regression
    • Replies: 1
    • Views: 327
    03-23-2017, 07:17 PM Go to last post
  60. How to convert data for Bland Altman plot?

    I have data from two different tests, one is an ultrasound and the other is an antibody based test. My aim is to validate the efficacy of the latter...

    Started by Tabi‎, 03-19-2017 10:47 PM
    • Replies: 2
    • Views: 464
    03-22-2017, 12:27 AM Go to last post

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