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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: 200,289
    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: 68,521
    09-30-2005, 09:44 AM Go to last post
  1. Links to Useful Data

    Hi, I'm new on that forum so please forgive me if I have chosen wrong category to ask my question :) Coming back to the point, as I mentioned in...

    Started by dinomilka‎, 02-04-2017 04:17 PM
    database data
    • Replies: 3
    • Views: 1,635
    02-05-2017, 04:25 PM Go to last post
  2. Help with OLS estimations

    Hi, I have a problem I was doing OLS estimations on the data I gathered and I got strange result. I assumed that the price of house is affected by...

    Started by dinomilka‎, 02-05-2017 11:52 AM
    • Replies: 3
    • Views: 1,468
    02-05-2017, 12:50 PM Go to last post
  3. Meta Analysis-Scales

    Hi, I am new into meta analysis and doing research on spirituality in organizations. I want to collect all scales and their results(on...

    Started by ahmetx‎, 02-05-2017 01:09 AM
    meta analysis, scales
    • Replies: 0
    • Views: 1,096
    02-05-2017, 01:09 AM Go to last post
  4. Basic high school correlation coefficient help

    Question + info: http://i.imgur.com/iyBWi2i.png In question 3, the correlation coefficient I get is the exact same as in question 2... Therefore...

    Started by touran‎, 02-04-2017 05:36 AM
    coefficient, correlation, log
    • Replies: 0
    • Views: 1,235
    02-04-2017, 05:36 AM Go to last post
  5. Question [SOLVED] presence absence data

    I have a data set of fish presence/absence in 15 different lakes. The fish communities include the following combinations: only species A; only...

    Started by blackduck‎, 02-02-2017 07:39 PM
    presence/absence data
    • Replies: 3
    • Views: 2,642
    02-04-2017, 04:03 AM Go to last post
  6. How to test baseline differences?

    I have 5 different groups, each with their own range of data elements like demographics and other metrics. I was wondering if it makes sense to test...

    Started by chiccaboom‎, 01-27-2017 02:03 PM
    • Replies: 7
    • Views: 3,245
    02-03-2017, 10:46 AM Go to last post
  7. t-test and p-value from processed data (mean, SD, sample number)

    Hi all, I am new to this forum and would greatly appreciate your help. I know how to do a t-test for significance when I have simple sets of raw...

    Started by walfrieda‎, 06-12-2008 02:44 AM
    • Replies: 6
    • Views: 45,984
    02-03-2017, 07:17 AM Go to last post
  8. Question about Normal Distribution and covariance between x bar and x i's

    Hello. I know this is quite easy,but I forgot! If Xi's have N(a,1) and Xm be the median of this observations then what is the Cov(x bar,Xm) ??

    Started by At.S‎, 02-03-2017 04:54 AM
    • Replies: 0
    • Views: 1,960
    02-03-2017, 04:54 AM Go to last post
  9. Interaction test

    I have a binary outcome and a binary independent variable, and am using an interaction test in SAS to determine whether sex (male vs female) modifies...

    Started by martink‎, 01-25-2017 03:10 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 5,379
    02-03-2017, 03:28 AM Go to last post
  10. Rescaling to get 5point distribution?

    When creating a scorecard, different categories(6) 5 are currently being rescaled to determine their distribution rating. Is it correct to...

    Started by Smartbuyer‎, 02-01-2017 03:36 PM
    • Replies: 0
    • Views: 1,280
    02-01-2017, 03:36 PM Go to last post
  11. Thumbs up Correct Cross Validation. How to calculate the projected R Squared or Residual Sum Sq

    Hi, I have read into the subject of finding good estimators to determine the goodness of fit when the regression on a trainingset is projected on a...

    Started by morthill‎, 02-01-2017 06:11 AM
    cross validation, least squares, least squares regression, matrix algebra, regression
    • Replies: 0
    • Views: 1,802
    02-01-2017, 06:11 AM Go to last post
  12. is it paired thorugh judgement

    could any one help . I have an assumption of independent data . though it came from different file two different format. any expert help me is it...

    Started by raju1‎, 01-31-2017 11:03 PM
    • Replies: 1
    • Views: 1,749
    02-01-2017, 05:46 AM Go to last post
  13. Statistical design problems

    Hello everyone! since Im not the best when it comes to statistics, I hope to find some good input over here :)! Im currently writing my...

    Started by statcem‎, 01-31-2017 07:37 AM
    experiment design
    • Replies: 0
    • Views: 1,742
    01-31-2017, 07:37 AM Go to last post
  14. Using statistical methods to find threshold/base line?

    Hello everyone, I am a newbie to statistics and would like to seek some advice. Are there any statistical methods that can be used to determine...

    Started by nizze‎, 04-19-2016 07:47 PM
    • Replies: 5
    • Views: 2,909
    01-31-2017, 07:21 AM Go to last post
  15. probability for two replication

    Suppose that a sample of size n is to be chosen randomly (without replacement) from an urn containing N balls, of which m are white and N-m are...

    Started by user1234‎, 01-31-2017 03:14 AM
    hypergeometric, probability, replication
    • Replies: 0
    • Views: 1,584
    01-31-2017, 03:14 AM Go to last post
  16. minimum number of data points for calculating standard error

    Hi Is it valid to use only 3 data points to calculate standard error. I have seen many papers with mean and standard error calculated for a variable...

    Started by sk2‎, 01-30-2017 07:13 PM
    • Replies: 6
    • Views: 1,938
    01-30-2017, 07:47 PM Go to last post
  17. Should I use Pearson or Spearman correlation?

    I have to know whether two variables are correlated or not in a sample. None of them are normally distributed, so I assumed that I should run...

    Started by helen9‎, 01-30-2017 06:23 PM
    correlation, correlation coefficient, pearson, pearson correlation, spearman
    • Replies: 1
    • Views: 1,963
    01-30-2017, 07:12 PM Go to last post
  18. Find peaks in a temporal serie

    Hi ! I have several temporal series where I would like to find peaks. I mean these series are a bit noisy sometimes, with many local maximum but...

    Started by payoux‎, 01-30-2017 04:31 PM
    • Replies: 0
    • Views: 1,850
    01-30-2017, 04:31 PM Go to last post
  19. Sample Size Calculator (one group versus population)

    Dear all, so far I couldnt find a solution to calculate the required sample size for the following scenario: Goal: Research continuous...

    Started by Conjoint Chirs‎, 01-29-2017 07:20 AM
    sample size, sample size calculation
    • Replies: 2
    • Views: 2,060
    01-29-2017, 03:57 PM Go to last post
  20. Nice fit statistics... except for RMSEA! How can I interpret this?

    Hi everyone, I have a question about a path model in which the CFI, TLI, and SRMR meet the commonly used cutoffs (i.e., over .9 for CFI & TLI;...

    Started by BlueSky17‎, 01-29-2017 01:59 PM
    • Replies: 0
    • Views: 1,285
    01-29-2017, 01:59 PM Go to last post
  21. Help on understanding sum of independent variables(new to statistics)

    Hello everybody. Im new to stat. Lets say i have an independent random variable X and Im having difficulties on wrapping around the idea on the...

    Started by KelvinG‎, 01-28-2017 11:11 PM
    • Replies: 2
    • Views: 1,782
    01-29-2017, 11:15 AM Go to last post
  22. Calculating the correlation of rankings

    Hello. For some work I have 5 participants who are to create an ordinal rank 5 parameters based on a question I set them. This will give a results...

    Started by dpashley‎, 01-29-2017 10:12 AM
    • Replies: 0
    • Views: 1,447
    01-29-2017, 10:12 AM Go to last post
  23. Intro Statistics books too superficial?

    I am sure many of you are familiar with the undergraduate "Intro" college textbooks on Statistics. Sometimes I feel these books are "cheating"...

    Started by StilloftheNight‎, 01-29-2017 01:16 AM
    • Replies: 1
    • Views: 2,045
    01-29-2017, 01:30 AM Go to last post
  24. Which significance test should I use?

    I have a research questionnaire using a five point Likert scale (not at all, little, neutral, considerable, significant). I want to statistically...

    Started by Zolitoo‎, 01-27-2017 03:07 PM
    • Replies: 1
    • Views: 1,478
    01-28-2017, 04:44 AM Go to last post
  25. Assumption for inferential regression

    I was reading about regressional inference and one of the assumptions stated was: The standard deviation of the responses about the population...

    Started by Mrgarrels‎, 01-27-2017 04:11 PM
    assumption, inference, regression
    • Replies: 3
    • Views: 1,627
    01-27-2017, 07:25 PM Go to last post
  26. Mallows Cp

    Hi all, I'm trying to manually resolve Cp for a simple set of data, but my results don't match the ones I get from Minitab. Data (a is the...

    Started by mgubellini‎, 01-27-2017 11:14 AM
    • Replies: 0
    • Views: 1,450
    01-27-2017, 11:14 AM Go to last post
  27. outlier in robust regressiom

    hi, I dont understand with this statment. "robust regression can be used to detect outliers and to provide resistant (stable) results in the...

    Started by Pamona D‎, 01-26-2017 07:03 AM
    outlier, robust linear regression
    • Replies: 1
    • Views: 2,027
    01-26-2017, 11:02 AM Go to last post
  28. A group is normally distributed but the other isn't

    Hi everyone, Using Shapiro -Wilk test I found that the assumption of normality for the control group was satisfied but that of the experimental...

    Started by MrM‎, 01-24-2017 05:46 AM
    • Replies: 7
    • Views: 2,337
    01-25-2017, 07:47 PM Go to last post
  29. Type II Error in Likelihood Ratio Tests

    Good afternoon, I'm currently working on my master thesis. I'm trying to recommend some improvements to the likelihood ratio tests that already...

    Started by Carlos CT‎, 01-25-2017 02:14 PM
    likelihood ratio test, type 2 errors, value at risk
    • Replies: 2
    • Views: 2,335
    01-25-2017, 02:38 PM Go to last post
  30. Calculating pooled standard deviation for more than two groups of unequal sample size

    Hi all, I struggle with calculating the pooled standard deviation for more than two groups of unequal sample size. After searching the internet...

    Started by cs_ut‎, 01-24-2017 10:10 AM
    • Replies: 0
    • Views: 1,890
    01-24-2017, 10:10 AM Go to last post
  31. 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, 01-23-2017 05:52 AM
    • Replies: 2
    • Views: 2,188
    01-23-2017, 05:07 PM Go to last post
  32. 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: 3,109
    01-23-2017, 05:05 AM Go to last post
  33. 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, 01-22-2017 08:25 AM
    • Replies: 1
    • Views: 2,265
    01-22-2017, 10:29 AM Go to last post
  34. 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: 3,620
    01-20-2017, 01:34 PM Go to last post
  35. 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: 3,118
    01-20-2017, 06:35 AM Go to last post
  36. 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: 2,336
    01-19-2017, 09:39 PM Go to last post
  37. 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: 2,039
    01-19-2017, 07:16 PM Go to last post
  38. 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: 2,806
    01-19-2017, 04:21 PM Go to last post
  39. 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: 2,447
    01-19-2017, 02:15 PM Go to last post
  40. 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: 2,868
    01-19-2017, 12:08 PM Go to last post
  41. 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: 3,579
    01-19-2017, 10:07 AM Go to last post
  42. 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: 2,946
    01-18-2017, 01:58 PM Go to last post
  43. 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: 1,918
    01-18-2017, 10:00 AM Go to last post
  44. 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: 2,695
    01-17-2017, 03:13 PM Go to last post
  45. 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: 2,339
    01-17-2017, 08:53 AM Go to last post
  46. 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: 2,469
    01-16-2017, 07:12 AM Go to last post
  47. 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: 3,233
    01-16-2017, 02:08 AM Go to last post
  48. 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: 2,069
    01-15-2017, 12:36 PM Go to last post
  49. 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: 3,172
    01-15-2017, 07:43 AM Go to last post
  50. 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: 2,454
    01-14-2017, 05:08 PM Go to last post
  51. 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: 5,933
    01-14-2017, 01:09 AM Go to last post
  52. 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: 2,681
    01-13-2017, 03:49 PM Go to last post
  53. 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: 2,402
    01-13-2017, 05:36 AM Go to last post
  54. 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: 2,597
    01-13-2017, 04:15 AM Go to last post
  55. 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: 2,948
    01-13-2017, 01:46 AM Go to last post
  56. 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: 2,875
    01-12-2017, 05:51 PM Go to last post
  57. 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: 5,064
    01-12-2017, 03:46 AM Go to last post
  58. 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: 2,770
    01-11-2017, 09:34 PM Go to last post
  59. 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: 2,293
    01-10-2017, 11:23 AM Go to last post
  60. 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: 3,164
    01-10-2017, 07:11 AM Go to last post

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