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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 200,305
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 68,531
09-30-2005, 09:44 AM
1. ### 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. ...

• Replies: 0
• Views: 623
04-23-2017, 09:07 AM
2. ### 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...

• Replies: 1
• Views: 784
04-23-2017, 04:39 AM
3. ### 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...

• Replies: 4
• Views: 947
04-21-2017, 11:36 AM
4. ### 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...

• Replies: 1
• Views: 724
04-21-2017, 08:34 AM
5. ### 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...

• Replies: 0
• Views: 1,012
04-21-2017, 06:43 AM
6. ### 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...

• Replies: 6
• Views: 1,227
04-20-2017, 09:52 PM
7. ### 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...

• Replies: 0
• Views: 828
04-20-2017, 04:38 PM
8. ### 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...

• Replies: 7
• Views: 1,045
04-20-2017, 11:17 AM
9. ### 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%...

• Replies: 3
• Views: 1,570
04-19-2017, 12:38 PM
10. ### 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...

• Replies: 3
• Views: 704
04-18-2017, 11:46 AM
11. ### Mediator transformation

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

• Replies: 0
• Views: 817
04-18-2017, 05:44 AM
12. ### 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...

• Replies: 0
• Views: 759
04-17-2017, 08:30 AM
13. ### 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...

• Replies: 0
• Views: 1,350
04-16-2017, 01:41 PM
14. ### 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...

• Replies: 1
• Views: 775
04-16-2017, 12:39 PM
15. ### 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...

• Replies: 8
• Views: 1,292
04-16-2017, 04:40 AM
16. ### 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...

• Replies: 4
• Views: 837
04-15-2017, 10:24 PM
17. ### 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...

• Replies: 3
• Views: 515
04-15-2017, 04:41 PM
18. ### 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...

• Replies: 0
• Views: 1,068
04-15-2017, 03:40 PM
19. ### 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...

• Replies: 1
• Views: 1,683
04-11-2017, 03:18 PM
20. ### [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...

• Replies: 4
• Views: 1,409
04-11-2017, 11:42 AM
21. ### 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...

• Replies: 0
• Views: 740
04-11-2017, 09:14 AM
22. ### 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...

• Replies: 2
• Views: 1,507
04-08-2017, 07:39 PM
23. ### 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...

• Replies: 0
• Views: 1,145
04-08-2017, 01:52 AM
24. ### 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...

• Replies: 3
• Views: 1,291
04-07-2017, 05:47 PM
25. ### 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...

• Replies: 0
• Views: 840
04-07-2017, 02:38 PM
26. ### 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...

• Replies: 8
• Views: 2,080
04-06-2017, 02:13 PM
27. ### 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...

• Replies: 5
• Views: 1,318
04-06-2017, 11:48 AM
28. ### 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...

• Replies: 0
• Views: 1,260
04-05-2017, 09:51 AM
29. ### 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...

• Replies: 1
• Views: 1,035
04-04-2017, 12:28 PM
30. ### 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...

• Replies: 2
• Views: 922
04-04-2017, 07:25 AM
31. ### 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...

• Replies: 0
• Views: 749
04-04-2017, 05:56 AM
32. ### 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...

• Replies: 1
• Views: 1,324
04-03-2017, 03:51 PM
33. ### Parametric vs. Nonparametric.

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

• Replies: 6
• Views: 1,173
04-03-2017, 12:06 PM
34. ### 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...

• Replies: 1
• Views: 1,638
04-02-2017, 12:03 PM
35. ### 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...

• Replies: 0
• Views: 1,353
04-02-2017, 11:21 AM
36. ### 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...

• Replies: 0
• Views: 777
04-02-2017, 06:46 AM
37. ### 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...

• Replies: 0
• Views: 1,004
04-01-2017, 03:28 PM
38. ### 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...

• Replies: 0
• Views: 617
04-01-2017, 11:18 AM
39. ### 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...

• Replies: 0
• Views: 1,497
03-31-2017, 04:48 PM
40. ### 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. ...

• Replies: 0
• Views: 972
03-31-2017, 12:15 PM
41. ### 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...

• Replies: 7
• Views: 1,459
03-30-2017, 06:26 PM
42. ### 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...

• Replies: 1
• Views: 1,303
03-29-2017, 02:07 PM
43. ### 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...

• Replies: 0
• Views: 1,119
03-28-2017, 02:19 PM
44. ### 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...

• Replies: 0
• Views: 992
03-28-2017, 02:13 PM
45. ### 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...

• Replies: 3
• Views: 1,507
03-28-2017, 11:50 AM
46. ### 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...

• Replies: 2
• Views: 1,167
03-28-2017, 04:19 AM
47. ### 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...

• Replies: 0
• Views: 958
03-25-2017, 12:35 PM
48. ### 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...

• Replies: 0
• Views: 1,313
03-24-2017, 07:57 PM
49. ### 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...

• Replies: 1
• Views: 1,357
03-24-2017, 03:42 PM
50. ### 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...

• Replies: 1
• Views: 1,115
03-24-2017, 04:14 AM
51. ### 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...

• Replies: 1
• Views: 1,293
03-23-2017, 07:17 PM
52. ### How can I intepret the effect sizes of Cramer's V when DF is high (like > 20)?

Dear All, I am doing Pearson Chi Square analyses in SPSS. Besides looking at the Chi Square Sig. value I also want to look at Cramer's V to analyze...

• Replies: 2
• Views: 2,477
03-21-2017, 06:46 PM
53. ### We did an experiment and don't know how to start/proceed with statistics?

We had to do an experiment in my research methods class. Me and my group did an experiment where we tested if participants remembered words better...

• Replies: 3
• Views: 1,553
03-21-2017, 05:12 PM
54. ### Which model to use + best fit?

Dear I'm wondering which is the best model to use for my data which is retrieved from a questionnaire at supermarkets. I'm trying to research...

• Replies: 0
• Views: 1,277
03-21-2017, 12:04 PM
55. ### Interpreting strange results

So effectively I have two variables, language problems, and emotional problems, both of which independently cause an increase in a third variable,...

• Replies: 0
• Views: 1,176
03-20-2017, 06:29 PM

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