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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: 141,836
    07-16-2014, 12:01 PM 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 10:44 AM
    • Replies: 0
    • Views: 40,858
    09-30-2005, 10:44 AM Go to last post
  1. Meta-analysis: number of effect sizes needed for meaningful moderator analysis

    Hi there, I would like to conduct a moderator analysis looking at the effects of six different moderators on the relationship between anxiety in...

    Started by DeeAmy‎, Today 05:52 AM
    • Replies: 1
    • Views: 24
    Today, 09:08 AM Go to last post
  2. Meta-analysis: How to calculate cohen's d using the range of scores and sample size

    Hi there, I am trying to calculate cohen's d (standardised mean difference) for a study that only reports the range (min and max), and not the mean...

    Started by DeeAmy‎, 01-21-2017 08:15 PM
    • Replies: 4
    • Views: 141
    Today, 05:05 AM Go to last post
  3. Need help on lognormal distribution

    Hello I'm a newbie here. I need help on how to find mean and standard deviation for a lognormal distribution. I've been searching on the internet...

    Started by djmal87‎, Yesterday 08:25 AM
    • Replies: 1
    • Views: 90
    Yesterday, 10:29 AM Go to last post
  4. Question Nominal & Ratio Variables: How to correlate?

    The following is the hypothesis I'm trying to work with: "Students who do not achieve at least 70% in high school English will not pass a college...

    Started by sjs016‎, 01-18-2017 10:08 AM
    correlation, hypothesis, nominal, ratio
    • Replies: 7
    • Views: 205
    01-20-2017, 01:34 PM Go to last post
  5. Post test of a decreasing function

    Hello :wave: I have some doubts about testing the effect that a decrease in value of x (independent variable) has on y (the dependent variable) ...

    Started by Ted Brasil‎, 01-20-2017 06:35 AM
    • Replies: 0
    • Views: 128
    01-20-2017, 06:35 AM Go to last post
  6. Red face Stats Homework Help

    Hey Everyone! :) I am stuck on some stats homework questions! Hoping someone can help me out.. 1. A friend flips a coin 10 times and says that...

    Started by Roopi‎, 01-19-2017 09:39 PM
    help me, homework, homework help, statistics, stats
    • Replies: 0
    • Views: 90
    01-19-2017, 09:39 PM Go to last post
  7. Determining which SPSS statistical test to use on unusual data

    Hi all! I am new here and am desperately in need of some expert assistance in choosing the correct statistical test to use. I am looking at the...

    Started by Dejana015‎, 01-19-2017 07:16 PM
    • Replies: 0
    • Views: 81
    01-19-2017, 07:16 PM Go to last post
  8. Statistics Problem...

    I have been trying to help my mother the best I can with her studies but we have came across a very large wall we can not seem to take down. The...

    Started by FootBallBat‎, 01-18-2017 05:03 PM
    • Replies: 4
    • Views: 168
    01-19-2017, 04:21 PM Go to last post
  9. Advice requested about mixed ANOVA

    Hi I'm studying the effect of different music styles on performance tasks. I'm considering a mixed ANOVA analysis, but I'm not very confident...

    Started by sconnar‎, 01-18-2017 06:59 AM
    • Replies: 3
    • Views: 165
    01-19-2017, 02:15 PM Go to last post
  10. which type of hypothesis test?

    Hello guys, I have a sample of 10.000 accommodations in 2013- 2016. I want to test two things but I am not sure I am on the right path. ...

    Started by diana_gu‎, 01-17-2017 01:27 PM
    • Replies: 6
    • Views: 197
    01-19-2017, 12:08 PM Go to last post
  11. ROC Curve - Assumptions?

    Hi All, I'd like to run a ROC curve analysis and was wondering if there are any statistical assumptions for this test. I've looked in a number...

    Started by bozatron‎, 01-18-2017 12:21 AM
    • Replies: 7
    • Views: 176
    01-19-2017, 10:07 AM Go to last post
  12. Regression Analysis-Moderation or Mediated Analysis

    Please excuse my lack of understanding of Regression Analysis, but would it be more appropriate to run a moderated or mediated regression analysis...

    Started by bella7‎, 01-18-2017 11:31 AM
    mediation analysis, mediation spss help, moderation, regression analysis, urgent
    • Replies: 2
    • Views: 113
    01-18-2017, 01:58 PM Go to last post
  13. Parameter of dispersion to use

    Hello, I have a quick question, first here is an example: These are two paramaters, let's say genes A and B and their level of expression in 9...

    Started by Stillhere‎, 01-18-2017 04:48 AM
    genes, hvg, var, variable expression
    • Replies: 1
    • Views: 92
    01-18-2017, 10:00 AM Go to last post
  14. Help with graph apparently showing standard deviation with 2 values?!

    Hi, I've got a presentation on a scientific paper this afternoon and am very confused with a graph in the paper (graph/dot plot C). I hope this...

    Started by jteighty‎, 01-17-2017 06:35 AM
    • Replies: 1
    • Views: 128
    01-17-2017, 03:13 PM Go to last post
  15. Model convergence and fit

    Hi, I am not understanding what the difference is between model convergence (as in a multivariable logistic regression model), versus the fit of a...

    Started by martink‎, 01-16-2017 06:18 PM
    • Replies: 5
    • Views: 209
    01-17-2017, 08:53 AM Go to last post
  16. Calculate component of percentage change

    Hi there, I have an interesting challenge which I hope someone can help me resolve. Please consider the attached table image showing periodic changes...

    Started by joncollin81‎, 01-16-2017 07:12 AM
    • Replies: 0
    • Views: 130
    01-16-2017, 07:12 AM Go to last post
  17. Is a Bonferroni correction needed for my particular dataset?

    I received a review of my manuscript in which one of the three reviewers advised that I will need to apply a Bonferroni correction due to multiple...

    Started by statsSeeker‎, 01-15-2017 02:00 PM
    bonferroni correction
    • Replies: 6
    • Views: 239
    01-16-2017, 02:08 AM Go to last post
  18. Simple percentage comparison

    Hi, I am working on a competition between 4 groups of people. The winner is the person who gets the most number of participants to show up at their...

    Started by ankrunner‎, 01-15-2017 10:04 AM
    • Replies: 1
    • Views: 147
    01-15-2017, 12:36 PM Go to last post
  19. paired or unpaired?

    Hi, Need some advice, if I'm comparing species abundance in the same location across two different seasons is this paired or non-paired for...

    Started by whyisstatssohard‎, 01-14-2017 08:58 AM
    mann whitney u test, paired, unpaired
    • Replies: 6
    • Views: 230
    01-15-2017, 07:43 AM Go to last post
  20. Interpretation of a certain observation

    I have some identities that are distributed in a 2D space. Each identity has the properties X, Y, latitude, and longitude. Each dataset on average...

    Started by alijamali‎, 01-13-2017 03:17 PM
    correlation, statis, statisitcs
    • Replies: 2
    • Views: 154
    01-14-2017, 05:08 PM Go to last post
  21. Normality Assumption for Independent t-test

    Hi All, This may be a fairly basic question but I am not the best at stats and so would very much appreciate your input. I wanted to get your...

    Started by bozatron‎, 01-12-2017 03:48 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 483
    01-14-2017, 01:09 AM Go to last post
  22. Smile Diagnostic test - speciicity when multiple testing - clever statistician needed!

    During validation of a diagnostic test a false positive event is observed in 1 out of 60 occasions leading to a specificity of 98.3% when testing for...

    Started by ChrisA1111‎, 01-13-2017 01:48 PM
    false positives, multiple testing, specificity
    • Replies: 1
    • Views: 119
    01-13-2017, 03:49 PM Go to last post
  23. Question Comparing Groups in Ordinal Logistic Regression

    Hi, I seem to have gotten a little confused about the possibility of comparing groups in ordinal logistic regression. Here is my issue: I...

    Started by Spont‎, 01-13-2017 05:36 AM
    compare groups, groups, logistic regression, ordinal regression, regression
    • Replies: 0
    • Views: 110
    01-13-2017, 05:36 AM Go to last post
  24. Missing data - seeking advice on approach!!

    INTRO:Planning list wise deletion of missing data from large data set (7772). Data is from online survey, participation self-select. Q's could be...

    Started by zardo‎, 01-13-2017 04:15 AM
    missing data, repeated measures, spss
    • Replies: 0
    • Views: 107
    01-13-2017, 04:15 AM Go to last post
  25. Confidence interval of density distribution

    Hi, I am a university student and I have a trouble with the following example. This is not what I am actually confronting, but I think it will make...

    Started by junishigohoka‎, 01-12-2017 06:09 AM
    confidence, confidence bands, density
    • Replies: 3
    • Views: 208
    01-13-2017, 01:46 AM Go to last post
  26. when to standarize and when to normalize

    I dont understand when is it appropriate to standardize my data and when it is appropriate to normalize my data. I know it will differ by project of...

    Started by semidevil‎, 01-12-2017 05:51 PM
    • Replies: 0
    • Views: 101
    01-12-2017, 05:51 PM Go to last post
  27. Calculating 95% Confidence Intervals for Prevalence (%)

    Hi All, I am hoping to get some advice on how I can calculate the 95% Confidence Intervals for prevalence percentages. My sample size is 180, and...

    Started by bozatron‎, 11-23-2016 01:54 AM
    • Replies: 4
    • Views: 427
    01-12-2017, 03:46 AM Go to last post
  28. Composite cut off calculation? And to convert number to percentiles?

    Hi, Can anyone please tell me how to create thresholds based on 3 parameters? For example if I have blood pressure (bp) and want to calculate BP...

    Started by Gigi213‎, 01-11-2017 06:08 PM
    • Replies: 1
    • Views: 143
    01-11-2017, 09:34 PM Go to last post
  29. How to combine standard deviations for paired samples?

    I have a group of individuals X, each member of the group has had two measures taken: i and j. I have the means and SDs of i and j. I also know...

    Started by robmcc‎, 01-10-2017 11:23 AM
    • Replies: 0
    • Views: 137
    01-10-2017, 11:23 AM Go to last post
  30. Which statistical test? I've shown my attempt to work it out.

    2 Questionnaires (for hope and self-image) are given to participants before, during, and after an intervention. All participants take part in the...

    Started by 12321‎, 12-28-2016 06:48 PM
    • Replies: 3
    • Views: 297
    01-10-2017, 07:11 AM Go to last post
  31. Null and alt hypothesis

    Hi, I am very new to anything even remotely to do with statistics. I have 3 questions that I need to get the null and alt hypothesis for. I've done a...

    Started by ts1990‎, 01-09-2017 10:26 AM
    • Replies: 2
    • Views: 193
    01-09-2017, 01:44 PM Go to last post
  32. longitudinal data

    Dear experts, I would like to measure change of performance over time in a longitudinal data set. Each participant was tested at 1 day, 1 week,...

    Started by Palermo‎, 01-08-2017 10:45 PM
    • Replies: 5
    • Views: 244
    01-09-2017, 12:22 PM Go to last post
  33. multiple proportions from one sample- sig testing

    Greetings all, I have a question about analysing responses from a multiple choice question. A lot of what we do in our analysis is say which...

    Started by TonyW‎, 11-05-2010 03:50 PM
    • Replies: 5
    • Views: 3,495
    01-09-2017, 10:49 AM Go to last post
  34. Simple effects to understand interaction between repeated variables in mixed ANOVA

    Hi there, I am having problems with the statistical analysis for a linguistics paper I am writing. So this study is a mixed ANOVA design with 3...

    Started by yinsstats‎, 01-09-2017 06:45 AM
    mixed design anova, simple effects
    • Replies: 0
    • Views: 135
    01-09-2017, 06:45 AM Go to last post
  35. Creating a single line graph

    Hi Probably graphs is not exactly the topic of this forum, but i needed help in this regard. I have values in one column. Like below: Blogs...

    Started by true_friend‎, 01-08-2017 09:39 AM
    graph, graph building
    • Replies: 0
    • Views: 175
    01-08-2017, 09:39 AM Go to last post
  36. Principal component and clustering

    Hi! I have a question concerning principal component analysis and how to pursue. First of all, this is my case: I have a lot of data points...

    Started by loes7815‎, 01-06-2017 09:04 AM
    cluster, clustering, pca, trendline
    • Replies: 0
    • Views: 185
    01-06-2017, 09:04 AM Go to last post
  37. Different samples

    Hello everyone I have the following doubt How can I prove that the data of different samples (sample 1 and sample 2) have similar behaviors? ...

    Started by MrDavid‎, 01-05-2017 10:22 PM
    distribution function, statistical analysis, test hypothesis
    • Replies: 3
    • Views: 248
    01-06-2017, 08:57 AM Go to last post
  38. Help with Statistical distributions

    Hello I have the following doubt, I hope you can help me, I really appreciate it - I have a population of 500 businesses - A sample of the...

    Started by MrDavid‎, 01-05-2017 07:34 AM
    distribution probability, distribution tests, statistical analysis, statistical inference
    • Replies: 2
    • Views: 188
    01-05-2017, 10:06 PM Go to last post
  39. normal distribution

    hi i am studying notmal distributions in class at the moment but i am struggling to understand how they appear graphically - i understand they look...

    Started by sophies27‎, 01-05-2017 10:27 AM
    • Replies: 3
    • Views: 196
    01-05-2017, 05:49 PM Go to last post
  40. Question Changing significance of variables

    Hello, I have two questions regarding the significance of variables, which may sound stupid but which I don't understand. I've done some...

    Started by StatStud‎, 01-05-2017 04:26 AM
    • Replies: 4
    • Views: 216
    01-05-2017, 12:03 PM Go to last post
  41. Inverse of the Standard Normal Cumulative Distribution

    I am not well versed on statistics, I know enough to be harmful I guess. I am working on some statistical models for safety stock and came across a...

    Started by goin4boge‎, 01-05-2017 10:18 AM
    • Replies: 1
    • Views: 141
    01-05-2017, 11:45 AM Go to last post
  42. Covariance function

    A stochastic process is identically equal to one. What is its covariance function? I got: M(1)^2-M^2(1)=1-1=0 Thx

    Started by redalertgamer‎, 01-05-2017 11:40 AM
    • Replies: 0
    • Views: 136
    01-05-2017, 11:40 AM Go to last post
  43. Help with basic statistics

    Hello, I am working in one research and I have to use statistics in order to show my data is significant or not... But I am just terrible at it...

    Started by valedanae‎, 01-05-2017 09:23 AM
    • Replies: 1
    • Views: 131
    01-05-2017, 10:53 AM Go to last post
  44. multivariate regression

    I would like to use a multivariate regressor of X to Y, while maintaining that the regression values are yet uncorrelated as possible to another...

    Started by nishanth‎, 01-04-2017 03:29 PM
    regression, statistics
    • Replies: 0
    • Views: 195
    01-04-2017, 03:29 PM Go to last post
  45. ANCOVA without between-subject variable

    I wonder whether it's meaningful to include a covariate if I am doing an repeated-measure analysis without any between-subject variable. In my...

    Started by gn02179246‎, 01-04-2017 07:34 AM
    • Replies: 0
    • Views: 199
    01-04-2017, 07:34 AM Go to last post
  46. Which statistical methods can i use in a quiz and survey application?

    Hello. I am a computer science student. I do a survey and quiz application for my final project. Teachers can create quizzes or surveys from their...

    Started by sagnymine‎, 01-04-2017 01:50 AM
    • Replies: 0
    • Views: 190
    01-04-2017, 01:50 AM Go to last post
  47. Multiple regression

    Is there any way you can control for a variable using multiple regression? In order to see if the relationship reduces or disappears between an Iv...

    Started by LLH1994‎, 01-02-2017 12:55 PM
    multiple regression, psychology, spss, statistical control
    • Replies: 3
    • Views: 300
    01-03-2017, 01:22 PM Go to last post
  48. Stratification Before or After Sample Size Estimation

    Hello, I have a population/universe of data that I intend to split into two groups based on a certain parameter. My question is should I stratify...

    Started by Lakshmee‎, 01-02-2017 04:08 PM
    • Replies: 0
    • Views: 211
    01-02-2017, 04:08 PM Go to last post
  49. Are 2 means statistically different?

    Good morning, I was wondering if there is a way to calculate a p value with only the following information: Group A: n=64; Oswestry Disability...

    Started by Trabeculae‎, 01-01-2017 01:39 PM
    standard deviation, t-test; variance; excel
    • Replies: 3
    • Views: 282
    01-02-2017, 10:56 AM Go to last post
  50. A (probably very basic) question...

    Hello, Sorry if this is not the correct place to post this. I have a binomial stats question that I just cannot get to grips with at all and I'm...

    Started by jdrewind‎, 01-01-2017 10:39 AM
    • Replies: 3
    • Views: 301
    01-02-2017, 02:56 AM Go to last post
  51. Brier score calculation: 2 methods should yield same result

    I have a set of 234 predictions of tennis match outcomes and 5 different prediction models. I use the two different methods for calculating the Brier...

    Started by beta‎, 01-01-2017 06:43 AM
    brier score, prediction, scoring
    • Replies: 1
    • Views: 194
    01-01-2017, 12:24 PM Go to last post
  52. Continuous vs categorical analysis

    I have a logistic multivariable regression model, and I am trying to understand what would happen if I analyze an independent variable, age, as...

    Started by martink‎, 12-30-2016 03:50 PM
    • Replies: 0
    • Views: 231
    12-30-2016, 03:50 PM Go to last post
  53. evaluating Kruskal-Wallis test results

    Using an online statistical tool I evaluated 5 group of students' (self-identified ethnic groups with na= 105; nb= 50; nc= 44; nd= 43; ne= 33.) ...

    Started by Zsuzsa‎, 12-21-2016 04:17 PM
    • Replies: 7
    • Views: 508
    12-30-2016, 03:02 PM Go to last post
  54. partial correlation with ordinal variables in SPSS???

    Dear stats friends I have 700 subjects with data on an ordinal DV: heart disease score between 0 and 3. I I want to run a partial correlation...

    Started by wulfgar‎, 12-30-2016 07:39 AM
    • Replies: 0
    • Views: 188
    12-30-2016, 07:39 AM Go to last post
  55. Chosing 2 data out of 4

    Hi, I need some suggestion. I am working at laboratory that uses mostly ASTM and ISO methods for coal analysis. For any test sample I make 2...

    Started by therdem‎, 12-30-2016 02:00 AM
    • Replies: 1
    • Views: 223
    12-30-2016, 03:22 AM Go to last post
  56. time series - ARIMA + ARIMAX + R

    Hello, I am not a statistician, a machine learning computer science person. Recently, have read quite a bit about ARIMA and ARIMAX and using them in...

    Started by Amaterasu‎, 12-29-2016 07:24 AM
    • Replies: 1
    • Views: 272
    12-29-2016, 01:42 PM Go to last post
  57. SPSS - enter a single case twice without increasing the total number of the cases

    I am in a data analysis phase of my PhD project which is archaeological in nature. I am looking at the distribution of lamps across time (N=687)....

    Started by traktor‎, 12-28-2016 08:06 PM
    chi-square, spss
    • Replies: 1
    • Views: 234
    12-28-2016, 09:40 PM Go to last post
  58. Multicollinearity issue

    Hi, I have a multivariable logistic model, and one of my categorical independent variables has 5 possible levels, with each level calculated as a...

    Started by martink‎, 12-25-2016 11:57 PM
    • Replies: 11
    • Views: 512
    12-28-2016, 10:10 AM Go to last post
  59. using Mann Whitney

    I am trying to analyze a survey that asked students to respond to questions e.g. “In my opinion, the economic system in the US leads to an unfair...

    Started by Zsuzsa‎, 12-28-2016 09:06 AM
    • Replies: 0
    • Views: 215
    12-28-2016, 09:06 AM Go to last post
  60. Calculating Sample Size for Prospective Study

    I'm trying to calculate the sample size needed for an observational prospective study that is assessing social predictors of depressive symptom...

    Started by murphy‎, 12-27-2016 06:44 PM
    • Replies: 0
    • Views: 233
    12-27-2016, 06:44 PM Go to last post

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