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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: 163,065
    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: 50,519
    09-30-2005, 09:44 AM Go to last post
  1. Stats Novice: Help finding if 1 value affects another

    Apologies I have learning trouble and stats are a particularly weak point. Im doing research on 10 animals species, and their conservation status...

    Started by Andrew182‎, Today 01:05 PM
    dependant or independant, relevant, stats, test, what test
    • Replies: 0
    • Views: 56
    Today, 01:05 PM Go to last post
  2. Multiple Regression Homework Help

    A team of researchers believed that parental expectations (PE), emotionality (E) and fear of negative evaluation (FNE) promoted social anxiety (SA)....

    Started by shevy‎, Yesterday 11:16 AM
    • Replies: 0
    • Views: 109
    Yesterday, 11:16 AM Go to last post
  3. Deriving the form of the best size for exponential distribution

    Hi everyone So in this question I am told that a supermarket claims that the mean time to serve a customer is equal to 4 mins.However, a customer...

    Started by XeroPhobous‎, 04-28-2017 06:20 PM
    erlang, gamma distribution, inferential statistics, statistics help, statistics homework
    • Replies: 6
    • Views: 147
    Yesterday, 10:49 AM Go to last post
  4. Nominal R2

    There already exits an R2 for binomial scale (Generalized R2 after Cox/Snell). Is it possible to further generalize Generalized R2 after Cox/Snell to...

    Started by consuli‎, Yesterday 05:32 AM
    • Replies: 0
    • Views: 67
    Yesterday, 05:32 AM Go to last post
  5. How can these signal components be independent ???

    Hi, In wireless communication theory, the complex baseband representation of a signal passing through a multipath propagating channel is modeled as...

    Started by diracsbracket‎, 04-27-2017 07:34 AM
    • Replies: 7
    • Views: 235
    04-28-2017, 10:21 AM Go to last post
  6. Comparing habitat use across seasons - what test can I run

    Hi, I've got some data on deer habitat use across 4 seasons and 6 different habitat types. I would like to test whether habitat use differs...

    Started by whyisstatssohard‎, 04-28-2017 07:12 AM
    • Replies: 0
    • Views: 59
    04-28-2017, 07:12 AM Go to last post
  7. Question about a 3x2 Repeated Measures ANOVA

    Hello :), There is a fairly straightforward problem I am struggling with for a while now, and it would be really cool if someone could tell me if...

    Started by Brutor‎, 04-28-2017 03:56 AM
    • Replies: 0
    • Views: 74
    04-28-2017, 03:56 AM Go to last post
  8. Factorial Design

    Suppose a dermatologist wants to study the effectiveness of two different preparations of a skin lotion using two different forms of application (for...

    Started by Batman3‎, 04-26-2017 06:04 PM
    anova, experimental design, interaction
    • Replies: 0
    • Views: 93
    04-26-2017, 06:04 PM Go to last post
  9. Forecasting with autocorrelation present

    Hello, if one is to compare different lag orders for forecasting (and minimize RMSFE, root mean squared forecast error) for lets say autoregressive...

    Started by schteeke1‎, 04-26-2017 02:14 PM
    autocorrelation, forecasting
    • Replies: 1
    • Views: 87
    04-26-2017, 05:52 PM Go to last post
  10. What type of statistical test do I use?

    Hi. I surveyed 110 people and got two variables: the color of their hair and their score on an exam. I want to find out which group is more likely to...

    Started by dawgs‎, 04-26-2017 09:57 AM
    statistical testing
    • Replies: 1
    • Views: 100
    04-26-2017, 01:41 PM Go to last post
  11. Statistical summary measure for "loyalty"

    Hi, Not sure this is the right forum for questions like this, but I give it a try :) I am selling Apples, Oranges, Bananas and Pears. Now I...

    Started by samot79‎, 04-26-2017 01:55 AM
    • Replies: 3
    • Views: 104
    04-26-2017, 04:54 AM Go to last post
  12. How to calculate reliability of a change score (SAS)

    Hi all, I'm hoping you can lend me your expertise on this somewhat obscure problem. I have some repeated measures data (time 1 measurement, time 2...

    Started by aseifert‎, 04-25-2017 09:42 AM
    difference score, reliability
    • Replies: 1
    • Views: 108
    04-25-2017, 11:35 AM Go to last post
  13. Question Multiple response set - is it possible to combine dichotomy and category responses?

    Hi, I am analysing questionnaire data in SPSS and looking to create a multiple response set for a question I posed. However the question contains...

    Started by dal‎, 04-25-2017 08:44 AM
    category, dichotomize, multiple response, questionnaire, spss
    • Replies: 0
    • Views: 91
    04-25-2017, 08:44 AM Go to last post
  14. Statistics exam

    Hi everyone, I've attached my statistics exam that's being sat on 9th May. I'm incredibly stuck and unsure where to begin. I figure question 2 is...

    Started by lorow‎, 04-25-2017 04:55 AM
    • Replies: 0
    • Views: 105
    04-25-2017, 04:55 AM Go to last post
  15. 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: 383
    04-24-2017, 11:16 AM Go to last post
  16. 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, 04-23-2017 06:52 PM
    • Replies: 1
    • Views: 125
    04-24-2017, 08:36 AM Go to last post
  17. 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, 04-23-2017 07:12 PM
    ancova, f test
    • Replies: 1
    • Views: 124
    04-23-2017, 10:00 PM Go to last post
  18. 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, 04-23-2017 06:28 PM
    • Replies: 1
    • Views: 101
    04-23-2017, 06:54 PM Go to last post
  19. 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, 04-23-2017 09:07 AM
    generalized mixed models, mediation
    • Replies: 0
    • Views: 91
    04-23-2017, 09:07 AM Go to last post
  20. 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: 138
    04-23-2017, 04:39 AM Go to last post
  21. 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: 196
    04-21-2017, 11:36 AM Go to last post
  22. 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: 116
    04-21-2017, 08:34 AM Go to last post
  23. 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: 110
    04-21-2017, 06:43 AM Go to last post
  24. 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: 272
    04-20-2017, 09:52 PM Go to last post
  25. 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: 166
    04-20-2017, 04:38 PM Go to last post
  26. 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: 215
    04-20-2017, 11:17 AM Go to last post
  27. 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: 163
    04-19-2017, 04:17 PM Go to last post
  28. 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: 196
    04-19-2017, 12:38 PM Go to last post
  29. 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: 190
    04-18-2017, 11:46 AM Go to last post
  30. 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: 133
    04-18-2017, 05:44 AM Go to last post
  31. 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: 142
    04-17-2017, 08:30 AM Go to last post
  32. 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: 169
    04-16-2017, 01:41 PM Go to last post
  33. 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: 211
    04-16-2017, 12:39 PM Go to last post
  34. 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: 290
    04-16-2017, 04:40 AM Go to last post
  35. 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: 226
    04-15-2017, 10:24 PM Go to last post
  36. 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: 216
    04-15-2017, 04:41 PM Go to last post
  37. 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: 137
    04-15-2017, 03:40 PM Go to last post
  38. 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: 284
    04-11-2017, 03:18 PM Go to last post
  39. [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
    • Replies: 4
    • Views: 229
    04-11-2017, 11:42 AM Go to last post
  40. 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: 141
    04-11-2017, 09:14 AM Go to last post
  41. 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: 320
    04-08-2017, 07:39 PM Go to last post
  42. 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: 250
    04-08-2017, 01:52 AM Go to last post
  43. 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: 350
    04-07-2017, 05:47 PM Go to last post
  44. 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: 189
    04-07-2017, 02:38 PM Go to last post
  45. 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: 373
    04-06-2017, 02:13 PM Go to last post
  46. 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: 455
    04-06-2017, 11:48 AM Go to last post
  47. 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: 206
    04-06-2017, 09:29 AM Go to last post
  48. 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: 283
    04-05-2017, 09:51 AM Go to last post
  49. 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: 268
    04-04-2017, 12:28 PM Go to last post
  50. 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: 270
    04-04-2017, 07:25 AM Go to last post
  51. 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: 213
    04-04-2017, 05:56 AM Go to last post
  52. 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: 299
    04-03-2017, 03:51 PM Go to last post
  53. 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: 354
    04-03-2017, 12:06 PM Go to last post
  54. 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: 472
    04-02-2017, 12:03 PM Go to last post
  55. 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: 281
    04-02-2017, 11:21 AM Go to last post
  56. 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: 207
    04-02-2017, 06:46 AM Go to last post
  57. 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: 464
    04-01-2017, 03:57 PM Go to last post
  58. 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: 242
    04-01-2017, 03:28 PM Go to last post
  59. 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: 207
    04-01-2017, 11:18 AM Go to last post
  60. 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: 313
    03-31-2017, 04:48 PM Go to last post

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