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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: 200,368
    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: 68,582
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,279
    03-21-2017, 12:04 PM Go to last post
  2. 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: 1,179
    03-20-2017, 06:29 PM Go to last post
  3. 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: 1,176
    03-20-2017, 02:59 PM Go to last post
  4. 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: 2,418
    03-20-2017, 10:36 AM Go to last post
  5. 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: 1,112
    03-20-2017, 07:25 AM Go to last post
  6. 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: 2,084
    03-19-2017, 10:40 AM Go to last post
  7. 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: 1,910
    03-18-2017, 09:34 PM Go to last post
  8. 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: 2,050
    03-18-2017, 11:16 AM Go to last post
  9. 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: 1,327
    03-17-2017, 08:47 PM Go to last post
  10. 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: 1,330
    03-17-2017, 12:24 PM Go to last post
  11. 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: 1,905
    03-17-2017, 11:33 AM Go to last post
  12. 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: 1,804
    03-16-2017, 09:37 AM Go to last post
  13. 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: 1,277
    03-15-2017, 11:40 AM Go to last post
  14. 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: 1,448
    03-15-2017, 05:52 AM Go to last post
  15. 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: 983
    03-15-2017, 01:28 AM Go to last post
  16. 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: 1,262
    03-14-2017, 12:03 PM Go to last post
  17. 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: 1,609
    03-14-2017, 02:22 AM Go to last post
  18. 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: 1,171
    03-14-2017, 02:06 AM Go to last post
  19. 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: 1,260
    03-13-2017, 11:11 PM Go to last post
  20. 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: 3,732
    03-13-2017, 06:19 PM Go to last post
  21. 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: 1,174
    03-13-2017, 06:59 AM Go to last post
  22. 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 07:09 AM
    anova, group comparison, t-test
    • Replies: 1
    • Views: 1,508
    03-13-2017, 06:54 AM Go to last post
  23. 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: 1,180
    03-12-2017, 09:06 PM Go to last post
  24. 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: 1,426
    03-12-2017, 03:20 PM Go to last post
  25. 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: 1,193
    03-12-2017, 12:54 PM Go to last post
  26. 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: 1,196
    03-12-2017, 12:48 PM Go to last post
  27. 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 08:17 PM
    • Replies: 2
    • Views: 1,372
    03-11-2017, 02:59 PM Go to last post
  28. 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 09:06 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 5,577
    03-11-2017, 01:20 PM Go to last post
  29. 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 12:32 PM
    hypothesis testing, t paired test
    • Replies: 0
    • Views: 1,245
    03-11-2017, 12:32 PM Go to last post
  30. 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 11:50 AM
    • Replies: 0
    • Views: 1,352
    03-10-2017, 11:50 AM Go to last post
  31. 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, 03-10-2017 12:55 AM
    nominal data, spss anova
    • Replies: 0
    • Views: 1,796
    03-10-2017, 12:55 AM Go to last post
  32. 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 03:00 PM
    anova, repeated measures
    • Replies: 0
    • Views: 1,397
    03-09-2017, 03:00 PM Go to last post
  33. 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 07:09 AM
    • Replies: 0
    • Views: 1,035
    03-09-2017, 07:09 AM Go to last post
  34. 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 04:43 AM
    error, sample size, statistic, survey, uncertainty
    • Replies: 0
    • Views: 1,282
    03-09-2017, 04:43 AM Go to last post
  35. 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 04:46 PM
    3afc, chi-square test, repeated measures
    • Replies: 0
    • Views: 1,689
    03-08-2017, 04:46 PM Go to last post
  36. 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 07:07 PM
    • Replies: 2
    • Views: 1,661
    03-08-2017, 11:00 AM Go to last post
  37. 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 08:20 AM
    • Replies: 0
    • Views: 1,525
    03-08-2017, 08:20 AM Go to last post
  38. 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 09:05 AM
    data, data analysis
    • Replies: 2
    • Views: 1,784
    03-08-2017, 07:33 AM Go to last post
  39. 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 08:43 AM
    • Replies: 5
    • Views: 1,834
    03-08-2017, 07:12 AM Go to last post
  40. 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 12:55 PM
    • Replies: 1
    • Views: 1,026
    03-07-2017, 05:06 PM Go to last post
  41. 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 04:55 AM
    confidence interval, excel
    • Replies: 2
    • Views: 1,522
    03-07-2017, 10:11 AM Go to last post
  42. 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 12:47 PM
    • Replies: 0
    • Views: 1,294
    03-06-2017, 12:47 PM Go to last post
  43. 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 02:48 PM
    • Replies: 1
    • Views: 1,342
    03-05-2017, 03:18 PM Go to last post
  44. 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: 2,520
    03-05-2017, 09:45 AM Go to last post
  45. 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 03:57 PM
    • Replies: 2
    • Views: 1,463
    03-05-2017, 04:37 AM Go to last post
  46. 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 01:52 PM
    • Replies: 2
    • Views: 1,892
    03-05-2017, 04:29 AM Go to last post
  47. calculate missing values

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

    Started by donan‎, 03-04-2017 05:01 PM
    • Replies: 3
    • Views: 1,355
    03-05-2017, 04:13 AM Go to last post
  48. 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 01:23 AM
    • Replies: 1
    • Views: 1,271
    03-05-2017, 02:56 AM Go to last post
  49. [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 10:57 AM
    descriptive statistics, inferential statistics, spss, t-test, t-test two-sample
    • Replies: 1
    • Views: 1,194
    03-04-2017, 04:09 PM Go to last post
  50. 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 01:17 PM
    correlation, covariance, independent events, joint probability
    • Replies: 1
    • Views: 1,071
    03-04-2017, 04:06 PM Go to last post
  51. 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 09:41 AM
    • Replies: 1
    • Views: 1,262
    03-04-2017, 02:49 PM Go to last post
  52. 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 02:44 AM
    • Replies: 2
    • Views: 1,185
    03-04-2017, 04:35 AM Go to last post
  53. 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 02:51 PM
    logistic regression
    • Replies: 5
    • Views: 1,874
    03-02-2017, 05:08 PM Go to last post
  54. 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 11:10 AM
    critical value
    • Replies: 1
    • Views: 1,701
    03-02-2017, 01:35 PM Go to last post
  55. 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 03:27 PM
    certainty, homework, stats help, urgent, word problems
    • Replies: 1
    • Views: 2,039
    03-02-2017, 01:34 PM Go to last post
  56. 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 01:23 PM
    • Replies: 0
    • Views: 1,422
    03-02-2017, 01:23 PM Go to last post
  57. Which test to determine if statistically significant

    What test can I use to determine if a result is statistically significant, see screenshot: https://www.screencast.com/t/y5z9SpFtW. 5% of the orders...

    Started by jasonwebber‎, 02-28-2017 12:42 PM
    significance test
    • Replies: 1
    • Views: 1,814
    03-02-2017, 01:00 PM Go to last post
  58. Mann Whitney U: can mean ranks be used along with medians in similarly shaped distrib

    Dear TalkStatsers, I would be deeply grateful if you could help me with a simple question I have!!! From what I have read about Mann Whitney U,...

    Started by Curtains White‎, 03-02-2017 11:39 AM
    mann whitney u test, mean ranks, means, median, shape of distributions
    • Replies: 0
    • Views: 1,376
    03-02-2017, 11:39 AM Go to last post
  59. Inverse Hazard Ratio and confidence interval

    Hi I'm trying to include a study in a meta-analysis of HRs but I think their HR is the reciprocal of what I need (p<0.05, HR 0.538 95%CI...

    Started by ngmowbray‎, 03-02-2017 05:59 AM
    • Replies: 1
    • Views: 2,231
    03-02-2017, 10:58 AM Go to last post
  60. New normed Goodness of Fit Measures ?

    Hello everybody! I am currently working on a robust regression problem, where Model R^2 and Spearman correlation recommend different models. ...

    Started by consuli‎, 02-14-2017 12:01 PM
    • Replies: 9
    • Views: 2,854
    02-27-2017, 08:51 PM Go to last post

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