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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 11:13 AM
    • Replies: 1
    • Views: 149,055
    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: 44,199
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1
    • Views: 118
    Today, 06:35 AM Go to last post
  2. 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, Yesterday 11:22 AM
    • Replies: 0
    • Views: 87
    Yesterday, 11:22 AM Go to last post
  3. 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: 0
    • Views: 103
    03-25-2017, 02:33 PM Go to last post
  4. 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: 75
    03-25-2017, 12:35 PM Go to last post
  5. 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: 62
    03-25-2017, 08:44 AM Go to last post
  6. 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: 114
    03-24-2017, 07:57 PM Go to last post
  7. 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: 116
    03-24-2017, 03:42 PM Go to last post
  8. 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: 107
    03-24-2017, 04:14 AM Go to last post
  9. 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: 124
    03-23-2017, 07:17 PM Go to last post
  10. 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: 1
    • Views: 127
    03-23-2017, 01:13 PM Go to last post
  11. 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: 225
    03-22-2017, 12:27 AM Go to last post
  12. Question 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...

    Started by Graveto‎, 02-17-2017 02:49 PM
    cramer's v, effect size, large df
    • Replies: 2
    • Views: 421
    03-21-2017, 06:46 PM Go to last post
  13. 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...

    Started by HateMath‎, 03-21-2017 03:48 PM
    calculations, data sets, experiment, hypothesis testing, null hypothesis
    • Replies: 3
    • Views: 149
    03-21-2017, 05:12 PM Go to last post
  14. 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...

    Started by Hypnoz‎, 03-21-2017 12:04 PM
    • Replies: 0
    • Views: 98
    03-21-2017, 12:04 PM Go to last post
  15. 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,...

    Started by TruroJP‎, 03-20-2017 06:29 PM
    interaction, interpretation, regression, results
    • Replies: 0
    • Views: 124
    03-20-2017, 06:29 PM Go to last post
  16. RSS Residual Sum Squares

    Hi im analysing my dissertation which has a OLS model. My RSS figures are very very big in some cases above 15000. I know a high RSS indicates a...

    Started by rupinp123‎, 03-20-2017 01:29 PM
    ols, ols regression, residuals, rss
    • Replies: 2
    • Views: 109
    03-20-2017, 02:59 PM Go to last post
  17. Quartiles in a normal Distribution

    I cannot figure out how the Z score comes near 0.68 the Table given to me in my textbook gives the z score for 0.75 as 0.77. What have I done wrong?

    Started by fmaxey‎, 03-16-2017 09:10 PM
    • Replies: 6
    • Views: 270
    03-20-2017, 10:36 AM Go to last post
  18. Which test should I run using SPSS ?

    Question: Which (in) accuracy is the waist circumference (LEO) of a grown man be predicted based on its fat (VETP)? Which (in) accuracy of...

    Started by lucaa_h‎, 03-20-2017 07:25 AM
    • Replies: 0
    • Views: 96
    03-20-2017, 07:25 AM Go to last post
  19. What are these formulas and what is their purpose? n=(sigma^2)(Z_alpha/h^2); two more

    I can't find reference to these formulas in the slides posted by my professor. I also can't find any versions of these formulas anywhere else online...

    Started by leadgame‎, 03-18-2017 10:13 PM
    formula, inference, intro
    • Replies: 4
    • Views: 201
    03-19-2017, 10:40 AM Go to last post
  20. Confidence and margin of error in samples

    Hi Forgive me, but my statistics knowledge is terrible having chosen mechanics to go alongside pure mathematics at school, but I have now come...

    Started by cherria1‎, 03-15-2017 10:25 PM
    • Replies: 1
    • Views: 235
    03-18-2017, 09:34 PM Go to last post
  21. 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: 0
    • Views: 154
    03-18-2017, 05:03 PM Go to last post
  22. Standard Error of Regression

    Im currently working on a dissertation. After running an OLS regression I have a statistic called the standard error of the regression. I have...

    Started by rupinp123‎, 03-17-2017 05:25 PM
    dissertation, ols regression, standard error
    • Replies: 3
    • Views: 246
    03-18-2017, 11:16 AM Go to last post
  23. Homework Boxplot/Five number summary question

    Studying for my exam tomorrow and was wondering if I could get some help with a question. Five number summary = 67 102 108 114 152 question :...

    Started by willisf1‎, 03-17-2017 08:47 PM
    • Replies: 0
    • Views: 151
    03-17-2017, 08:47 PM Go to last post
  24. Statistic And Probability

    Kindly assist: 8% students are left handed, if 20% students are randomly selected, calculate: (i) probability that none of them are left handed...

    Started by Tranquiltzt‎, 03-17-2017 12:21 PM
    • Replies: 1
    • Views: 128
    03-17-2017, 12:24 PM Go to last post
  25. Non-comparative studies in a meta-analysis

    I am currently busy with the statitics of a meta-analysis using non-comparative studies. Therefor I used the RevMan tool by Cochrane Initiative. But...

    Started by Rotterdam‎, 03-14-2017 10:37 AM
    • Replies: 9
    • Views: 278
    03-17-2017, 11:33 AM Go to last post
  26. Smile generating random data for a scatter plot.

    Hi there, My stats knowledge is pretty limited so I would appreciate any help available on the following question. I want to generate a...

    Started by RichardHE‎, 03-16-2017 05:52 AM
    #datapoints, #random, #randomdata, #scatter
    • Replies: 2
    • Views: 226
    03-16-2017, 09:37 AM Go to last post
  27. Question Statistically significantly different percentages, I do not know how to answer this.

    Adult Type 1 diabetics were randomly assigned to standard care or participation in a six week workshop lead by a diabetic specialist nurse. Of the...

    Started by ajuhasz‎, 03-14-2017 04:59 PM
    • Replies: 3
    • Views: 237
    03-15-2017, 11:40 AM Go to last post
  28. Smile Kappa for binary repeated measures

    Hi! I have two raters (patient and physician) who rate the a condition at several visits. I would like to account for inter-individual correlation...

    Started by DSB‎, 03-15-2017 05:52 AM
    binary data, kappa, repeated measure
    • Replies: 0
    • Views: 166
    03-15-2017, 05:52 AM Go to last post
  29. Finding the average of percentage increase of data in a tabular form

    Hi guys I need some help on which method is the best to use in calculating the average of percentage increase

    Started by Alfiegenius‎, 03-15-2017 01:28 AM
    • Replies: 0
    • Views: 165
    03-15-2017, 01:28 AM Go to last post
  30. Analysing proportional data?

    Hi! I'm a masters psychology student needing a little help with a dataset I'm analysing :shakehead Dataset: My data has a within-subjects factor...

    Started by arisu‎, 03-14-2017 12:03 PM
    • Replies: 0
    • Views: 99
    03-14-2017, 12:03 PM Go to last post
  31. Information Value calculation

    Hi guys, I am reading a paper regarding modeling fractional outcomes - http://support.sas.com/resources/papers/proceedings14/1304-2014.pdf and...

    Started by tradermartin‎, 03-13-2017 04:50 PM
    • Replies: 1
    • Views: 182
    03-14-2017, 02:22 AM Go to last post
  32. Comparing two groups and then the sub-groups (of the same)

    Hi I have four groups of variables A, B, C and D. The variables A and B also have (natural) sub-groups (say A1, A2, A3 and B1, B2 and B3). I want to...

    Started by true_friend‎, 03-14-2017 02:06 AM
    anova, comparisons, overlap, subgroups, t test
    • Replies: 0
    • Views: 141
    03-14-2017, 02:06 AM Go to last post
  33. Reporting t-test (table) + boxplot (mean, range and outliers)

    Hi I am looking for a reasonably appropriate way to report t-test along with a summary statistics. Initially I only wanted to go with box plots, and...

    Started by true_friend‎, 03-13-2017 12:15 PM
    box plot, summary statistics, t test
    • Replies: 2
    • Views: 181
    03-13-2017, 11:11 PM Go to last post
  34. How can I solve this expected value equation?

    The equation is E x E = 1 where X is a continuous random variable with its expected value and distribution unknown and f is a function that...

    Started by Gadersd‎, 03-13-2017 03:56 PM
    • Replies: 4
    • Views: 211
    03-13-2017, 06:19 PM Go to last post
  35. Question Which test should I use? (Questionnaire analysis)

    Dear all I just received all questionnaire responses but I am not sure which test is the best for analyzing the data. The questionnaires were...

    Started by tomzxzx1705‎, 03-13-2017 02:32 AM
    analysis, quantitative analysis, questionnaire
    • Replies: 1
    • Views: 191
    03-13-2017, 06:59 AM Go to last post
  36. ANOVA or T-test

    Hi I have two categorical variables as in below example: Region Dim Value PK Dim1 2 PK Dim2 3 PK Dim3 -1 PK Dim4 -4 US Dim1 -0.5 US Dim2 4.3...

    Started by true_friend‎, 03-11-2017 06:09 AM
    anova, group comparison, t-test
    • Replies: 1
    • Views: 226
    03-13-2017, 06:54 AM Go to last post
  37. Is this a completely randomized design?

    Hello everyone, I am wanting to make sure that what I have is a completely randomized design. This is not homework, but rather thesis research. It...

    Started by 98mazdaman‎, 03-12-2017 09:06 PM
    • Replies: 0
    • Views: 167
    03-12-2017, 09:06 PM Go to last post
  38. Sample size

    Hi I'm trying to work out how a previous study calculated their sample size. They're are looking at two different diagnostic test and performing both...

    Started by statsfail2‎, 03-12-2017 09:42 AM
    • Replies: 1
    • Views: 168
    03-12-2017, 03:20 PM Go to last post
  39. MANOVA with one cell "missing"?

    Hi everyone, I have a problem with an analysis that's part of a statistics course. We were handed out a dataset (total n=456) that's supposed to...

    Started by davbr7‎, 03-12-2017 12:54 PM
    manova
    • Replies: 0
    • Views: 150
    03-12-2017, 12:54 PM Go to last post
  40. Quasi Experimental design

    If i have two groups that are statistically different can I use a switching replications design to increase validity?

    Started by jmem12‎, 03-12-2017 12:48 PM
    • Replies: 0
    • Views: 146
    03-12-2017, 12:48 PM Go to last post
  41. Data trending and probability claims

    Hello all, I have a question which might not have a solution but here goes nothing. I need to conduct some testing over a products shelf life...

    Started by Brbobo4‎, 03-09-2017 07:17 PM
    • Replies: 2
    • Views: 277
    03-11-2017, 01:59 PM Go to last post
  42. Bland-Altman plot interpretation

    Good afternoon, I am trying to compare humidity levels taken with our old hygrometers vs. our new one. I did some research over the internet,...

    Started by alexiab‎, 02-16-2017 08:06 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 921
    03-11-2017, 12:20 PM Go to last post
  43. Two Tailed Hypothesis Testing

    A sales compnay wants to forecast its sales . There are 2 samples with n1 =30 and n2=30 .Since its a small sample I did paired t- Test in excel . I...

    Started by Swatrhi‎, 03-11-2017 11:32 AM
    hypothesis testing, t paired test
    • Replies: 0
    • Views: 172
    03-11-2017, 11:32 AM Go to last post
  44. Making RevMan work for a meta-analysis

    I tried using RevMan for my meta-analysis, but It doesn't work. I filled in all data, but because all data come from different studies, the data...

    Started by Rotterdam‎, 03-10-2017 10:50 AM
    • Replies: 0
    • Views: 241
    03-10-2017, 10:50 AM Go to last post
  45. SPSS 2 way ANOVA with nominal data

    I have to analyze data from an in class experiment. The experiment had 4 total conditions (2 IVs, each with 2 levels) and tested memory recall (DV)...

    Started by muluni‎, 03-09-2017 11:55 PM
    nominal data, spss anova
    • Replies: 0
    • Views: 176
    03-09-2017, 11:55 PM Go to last post
  46. Interpreting Repeated Measures Anova

    Hello, I have what I think is a very elementary question about the results of a repeated measures ANOVA. Say that there are two factors of...

    Started by Zach‎, 03-09-2017 02:00 PM
    anova, repeated measures
    • Replies: 0
    • Views: 185
    03-09-2017, 02:00 PM Go to last post
  47. What would be the most appropriate table, chart or graph for this study?

    We just concluded data gathering on a study involving the relation of time spent doing Math homework to the student's math grade for the certain...

    Started by asus30‎, 03-09-2017 06:09 AM
    • Replies: 0
    • Views: 221
    03-09-2017, 06:09 AM Go to last post
  48. Survey uncertainty with a given population proportion

    Hello! I have to estimate the uncertainty of the result of a survey where there sample size was defined to have an uncertainty of 2.76%, based on...

    Started by milanoleonardo‎, 03-09-2017 03:43 AM
    error, sample size, statistic, survey, uncertainty
    • Replies: 0
    • Views: 189
    03-09-2017, 03:43 AM Go to last post
  49. Chi-square test OK for repeated measures?

    Hello, I have conducted a 3 alternative forced choice experiment (3AFC) where participants had to combine one out of three visualizations with a...

    Started by emmenru‎, 03-08-2017 03:46 PM
    3afc, chi-square test, repeated measures
    • Replies: 0
    • Views: 237
    03-08-2017, 03:46 PM Go to last post
  50. Comparing tests - Graph Help

    Hi, This is very basic but really struggling to find the correct terminology to find out what I want to do. I have collected data on two methods...

    Started by k093‎, 03-07-2017 06:07 PM
    • Replies: 2
    • Views: 272
    03-08-2017, 10:00 AM Go to last post
  51. help - from data to glm (non-normal, central limit theorem etc)

    Hey! I have some data, i have made glm's (binomial family and log link) and got some output. i'm not quite sure about what i'm actually doing...

    Started by eternally.grateful‎, 03-08-2017 07:20 AM
    • Replies: 0
    • Views: 228
    03-08-2017, 07:20 AM Go to last post
  52. How should i use this dataset?

    Hi all! I'm trying to figure out which way I should deal with my data I have data sampled from 2 "general areas" on opposite sides of the...

    Started by eternally.grateful‎, 03-03-2017 08:05 AM
    data, data analysis
    • Replies: 2
    • Views: 332
    03-08-2017, 06:33 AM Go to last post
  53. Unbalanced, non-normal, heteroscedastic ANOVA alternatives.

    I wanted to compare the means of 4 groups, all of which with a different number of observations. None of the group residuals are normally distributed...

    Started by Prometheus‎, 03-03-2017 07:43 AM
    • Replies: 5
    • Views: 385
    03-08-2017, 06:12 AM Go to last post
  54. Angry Beginner needing basic advice - Ordinal Data correlations - how??

    Hi all, I'm very new to statistics and was hoping for some easy to digest infomation regarding my (probably easy) problem. I have a set of...

    Started by tbarrows112‎, 03-06-2017 11:55 AM
    • Replies: 1
    • Views: 279
    03-07-2017, 04:06 PM Go to last post
  55. Help with figuring out confidence interval level

    Hello. My group was conducting a statistics study and we had all our data in an Excel file. We held a pretest (asked survey to nonmembers of the...

    Started by asus30‎, 03-07-2017 03:55 AM
    confidence interval, excel
    • Replies: 2
    • Views: 261
    03-07-2017, 09:11 AM Go to last post
  56. Testing mean difference on group means, multiple independent groups/sites

    Hello Talk Stats group, I am trying to find out what statistical tests to run on a set of aggregate data (no individual data) on 3 different...

    Started by PamelaF‎, 03-06-2017 11:47 AM
    • Replies: 0
    • Views: 159
    03-06-2017, 11:47 AM Go to last post
  57. Calculating test stats from hypothesis (easy question, but O completely confused)

    Hello, I am trying to complete what seems to be an easy problem, but I am stumped. Using the theory (null hypothesis) that a genetic trait is...

    Started by dorothy8‎, 03-05-2017 01:48 PM
    • Replies: 1
    • Views: 264
    03-05-2017, 02:18 PM Go to last post
  58. How do I set up this Chi Square Test of Independence?

    Here's the problem I'm working with: "During economic downturns corporations may undertake a “reduction in force,” known as an RIF, in which...

    Started by landsman‎, 06-20-2015 03:49 PM
    • Replies: 2
    • Views: 838
    03-05-2017, 08:45 AM Go to last post
  59. Using standard deviations to group participants

    I have scores from 83 participants, and would like to group them in to high, medium and low. The data is normally distributed. I thought that I...

    Started by charlie007‎, 03-04-2017 02:57 PM
    • Replies: 2
    • Views: 259
    03-05-2017, 03:37 AM Go to last post
  60. i need help interpreting this chart for a research article i'm studying

    this is the data i'm looking at. I'm a nursing student and we haven't really gone over statistics for this class. So, The first table examines the...

    Started by jmgonzalezj‎, 03-04-2017 12:52 PM
    • Replies: 2
    • Views: 294
    03-05-2017, 03:29 AM Go to last post

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