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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: 148,409
    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: 43,852
    09-30-2005, 09:44 AM Go to last post
  1. 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: 173
    Yesterday, 12:27 AM Go to last post
  2. 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: 382
    03-21-2017, 06:46 PM Go to last post
  3. 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: 114
    03-21-2017, 05:12 PM Go to last post
  4. 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: 67
    03-21-2017, 12:04 PM Go to last post
  5. 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: 91
    03-20-2017, 06:29 PM Go to last post
  6. 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: 80
    03-20-2017, 02:59 PM Go to last post
  7. 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: 231
    03-20-2017, 10:36 AM Go to last post
  8. 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: 73
    03-20-2017, 07:25 AM Go to last post
  9. 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: 168
    03-19-2017, 10:40 AM Go to last post
  10. 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: 188
    03-18-2017, 09:34 PM Go to last post
  11. 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: 114
    03-18-2017, 05:03 PM Go to last post
  12. 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: 212
    03-18-2017, 11:16 AM Go to last post
  13. 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: 120
    03-17-2017, 08:47 PM Go to last post
  14. 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: 100
    03-17-2017, 12:24 PM Go to last post
  15. 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: 228
    03-17-2017, 11:33 AM Go to last post
  16. 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: 188
    03-16-2017, 09:37 AM Go to last post
  17. 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: 206
    03-15-2017, 11:40 AM Go to last post
  18. 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: 127
    03-15-2017, 05:52 AM Go to last post
  19. 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: 136
    03-15-2017, 01:28 AM Go to last post
  20. 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: 69
    03-14-2017, 12:03 PM Go to last post
  21. 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: 158
    03-14-2017, 02:22 AM Go to last post
  22. 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: 116
    03-14-2017, 02:06 AM Go to last post
  23. 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: 154
    03-13-2017, 11:11 PM Go to last post
  24. 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: 181
    03-13-2017, 06:19 PM Go to last post
  25. 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: 163
    03-13-2017, 06:59 AM Go to last post
  26. 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: 189
    03-13-2017, 06:54 AM Go to last post
  27. 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: 136
    03-12-2017, 09:06 PM Go to last post
  28. 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: 142
    03-12-2017, 03:20 PM Go to last post
  29. 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: 123
    03-12-2017, 12:54 PM Go to last post
  30. 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: 116
    03-12-2017, 12:48 PM Go to last post
  31. 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: 242
    03-11-2017, 01:59 PM Go to last post
  32. 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: 851
    03-11-2017, 12:20 PM Go to last post
  33. 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: 146
    03-11-2017, 11:32 AM Go to last post
  34. 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: 210
    03-10-2017, 10:50 AM Go to last post
  35. 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: 146
    03-09-2017, 11:55 PM Go to last post
  36. 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: 157
    03-09-2017, 02:00 PM Go to last post
  37. 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: 190
    03-09-2017, 06:09 AM Go to last post
  38. 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: 156
    03-09-2017, 03:43 AM Go to last post
  39. 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: 202
    03-08-2017, 03:46 PM Go to last post
  40. 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: 232
    03-08-2017, 10:00 AM Go to last post
  41. 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: 195
    03-08-2017, 07:20 AM Go to last post
  42. 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: 298
    03-08-2017, 06:33 AM Go to last post
  43. 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: 355
    03-08-2017, 06:12 AM Go to last post
  44. 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: 252
    03-07-2017, 04:06 PM Go to last post
  45. 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: 222
    03-07-2017, 09:11 AM Go to last post
  46. 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: 120
    03-06-2017, 11:47 AM Go to last post
  47. 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: 237
    03-05-2017, 02:18 PM Go to last post
  48. 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: 805
    03-05-2017, 08:45 AM Go to last post
  49. 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: 225
    03-05-2017, 03:37 AM Go to last post
  50. 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: 255
    03-05-2017, 03:29 AM Go to last post
  51. calculate missing values

    Hello, I have these data: X | Y |X+Y| 1 | 2 | 3 | 4 | 2 | 6 | - | - | ...

    Started by donan‎, 03-04-2017 04:01 PM
    • Replies: 3
    • Views: 264
    03-05-2017, 03:13 AM Go to last post
  52. Help with non-linearity (log odds and predictor) in logistic regression - next steps

    Hi, I posted this previously in the wrong section of the forum . . . I think it belongs here. I'm new to modelling and logistic regression, so I...

    Started by AliceMiles‎, 03-05-2017 12:23 AM
    • Replies: 1
    • Views: 236
    03-05-2017, 01:56 AM Go to last post
  53. [SPSS - T-Test] - understanding how to approach a question

    Hello, I have I inputted my data into SPSS. This is the question that I have been given: Compare the QABF attention(interval data)scores...

    Started by emilyrose‎, 03-04-2017 09:57 AM
    descriptive statistics, inferential statistics, spss, t-test, t-test two-sample
    • Replies: 1
    • Views: 222
    03-04-2017, 03:09 PM Go to last post
  54. Joint Probability

    Hi All, I'm currently in a grad course with a nice complement of stats which we have been tasked to learn ourselves. Having some difficulties...

    Started by McHombre‎, 03-04-2017 12:17 PM
    correlation, covariance, independent events, joint probability
    • Replies: 1
    • Views: 199
    03-04-2017, 03:06 PM Go to last post
  55. Null hypothesis for Roman dice

    I’m museum curator working on a project that’s looking for evidence of bias in Roman dice. This involves me rolling each dice a few hundred times and...

    Started by sburrow‎, 03-04-2017 08:41 AM
    • Replies: 1
    • Views: 227
    03-04-2017, 01:49 PM Go to last post
  56. simple question: descriptives in excel

    Hi, I was just looking at descriptives in excel and I saw that I get different values when I do it manually, and I'm not sure why. If I have the...

    Started by fffrost‎, 03-04-2017 01:44 AM
    • Replies: 2
    • Views: 220
    03-04-2017, 03:35 AM Go to last post
  57. Logistic regression - intepretation of results

    Hi all, I have binary data for which 70% involve 1 (yes) and 30% involve 0 (no). I've done logistic regression in MedCalc. Results below: ...

    Started by AgataM‎, 03-02-2017 01:51 PM
    logistic regression
    • Replies: 5
    • Views: 325
    03-02-2017, 04:08 PM Go to last post
  58. critical value X 2r

    Find the critical value X 2R corresponding to a sample size of 19 and a confidence level of 99% if the test is two-tailed. I am lost on how to...

    Started by kate537‎, 02-26-2017 10:10 AM
    critical value
    • Replies: 1
    • Views: 312
    03-02-2017, 12:35 PM Go to last post
  59. Help its urgent!

    Q1)A certain stimulus administrated to each of the nine patients resulted in the following increase in blood pressure: 5,1,8,0,3,3,5,-2,4 Can it be...

    Started by Ifailedinstats‎, 02-26-2017 02:27 PM
    certainty, homework, stats help, urgent, word problems
    • Replies: 1
    • Views: 302
    03-02-2017, 12:34 PM Go to last post
  60. HELP: How to calculate sample size for prospective cohort study

    I'm trying to calculate the sample size for a prospective cohort study in which I will be comparing risk factors in 2 groups: group 1 will have a...

    Started by murphy‎, 03-02-2017 12:23 PM
    • Replies: 0
    • Views: 221
    03-02-2017, 12:23 PM Go to last post

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