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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: 197,262
    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: 67,029
    09-30-2005, 09:44 AM Go to last post
  1. Compare std deviation to know which dataset has more data points closer to mean?

    Hi I have two datasets each with different mean and standard deviation (std). We know that, std is a measure of the dispersion of the numbers from...

    Started by zqzuk‎, 05-26-2013 06:25 PM
    • Replies: 2
    • Views: 1,258
    05-28-2013, 11:41 AM Go to last post
  2. Uncertainty of the sample mean

    I am sampling an unknown distribution (see attachment for a histogram of 10000 samples) and calculating the sample mean Ķ_bar. Now I would like to...

    Started by Tax‎, 05-24-2013 09:53 AM
    • Replies: 3
    • Views: 4,448
    05-28-2013, 11:32 AM Go to last post
  3. model comparison, log likelihood score, P value.

    I am working on Bioinformatic analysis of genomic data. I am doing some statistical analysis and doing model comparison and have some conceptual...

    Started by bagdevi‎, 05-27-2013 04:49 AM
    log likelihood score, model comparison, p value
    • Replies: 3
    • Views: 3,475
    05-28-2013, 08:10 AM Go to last post
  4. Grouping multiple survey question to obtain 1 Mean & Std. Dev.

    Hi, I am currently doing an academic research and I would like some advice on the following issue. The research is about age & gender...

    Started by makkumakku‎, 05-28-2013 08:08 AM
    customer satisfaction
    • Replies: 0
    • Views: 1,541
    05-28-2013, 08:08 AM Go to last post
  5. Question interpreting and commenting on Repeated-Measures ANOVA results

    Hello, everybody, you've always been really helpful, so I've got a question to you, again :) I am dealing with an assignment, where we have to...

    Started by invisibleme‎, 05-28-2013 06:43 AM
    anova, repeated measure anova, reporting results
    • Replies: 0
    • Views: 1,244
    05-28-2013, 06:43 AM Go to last post
  6. What Test to Use to Compare Groups

    I'm looking through some data that I have collected from my patients over the past year and wanted to know what Statistical Test to use to see if a...

    Started by nmverma‎, 05-27-2013 08:01 PM
    equivalence testing, test of significance
    • Replies: 10
    • Views: 1,693
    05-28-2013, 03:35 AM Go to last post
  7. Stats homework Help

    Hey Guys I kind of need help with these questions:) would really appreciate it:) 1.)When the assumption of sphericity is violated, correction...

    Started by kavi‎, 05-28-2013 01:59 AM
    homework
    • Replies: 2
    • Views: 1,754
    05-28-2013, 02:37 AM Go to last post
  8. GW shark study- You give advice on the stats and I give advice on swim spots ;)

    Disclaimer: I am fairly new to the stats side of Ecology, I have carried out a bit of field work in my time but have only come over to the analysis...

    Started by Clem‎, 05-06-2013 04:45 AM
    anova ecology biology
    • Replies: 10
    • Views: 1,866
    05-28-2013, 01:35 AM Go to last post
  9. Poll Poll: Compare differnt size portfolio performance

    Hello this is my first post, apologies if itís not clear or the wrong format I am currently comparing loan arrears of different loan portfolios. ...

    Started by Philc‎, 05-28-2013 01:18 AM
    • Replies: 0
    • Views: 793
    05-28-2013, 01:18 AM Go to last post
  10. NMDS and Arch Effect?

    Dear experts, I have a pattern in my NMDS plot (isoMDS, vegan, based on Simpson dissimilarity between communities), which looks like it is...

    Started by PatHim‎, 05-28-2013 12:20 AM
    • Replies: 0
    • Views: 830
    05-28-2013, 12:20 AM Go to last post
  11. Simple Pre Post Survey Results

    Hello, I have the following setup 30 individuals, comprising * 3 ethnicities * 3 occupations 10 survey questions (answers from 1 to 10) ...

    Started by mdi455‎, 05-27-2013 12:01 PM
    post, pre
    • Replies: 1
    • Views: 1,164
    05-27-2013, 07:07 PM Go to last post
  12. Correlating two variables having different value ranges

    Hi folks! I'm really a novice when it comes to statistics so please be gentle. I'm analyzing data from genomic assays and I would like to correlate...

    Started by Darius‎, 05-27-2013 08:13 AM
    correlating
    • Replies: 0
    • Views: 1,120
    05-27-2013, 08:13 AM Go to last post
  13. permutation test on 2-factor contingency table

    Anyone has an idea on how to perform a permutation test on a 2-factor contingency table? In R? thanks!! :)

    Started by stablum‎, 05-27-2013 06:07 AM
    2-factor, contingency table, factors, permutation test, r-language
    • Replies: 0
    • Views: 2,314
    05-27-2013, 06:07 AM Go to last post
  14. Kruskal-Wallis & Regression: unequal n, unequal sd & non-normal dep.var.

    Hello and thank you for reading this thread! My problem is as follows: I conducted a simple experiment to check for the effect of gender and...

    Started by fxp‎, 05-24-2013 04:35 PM
    • Replies: 2
    • Views: 3,734
    05-27-2013, 03:28 AM Go to last post
  15. Can an explanatory variable be both a random and fixed effect simultaneously?

    Hello, and thank you for reading. I am trying to test for what environmental variables (3 continuous distance variables e.g. distance from...

    Started by t.cheng‎, 05-26-2013 08:29 AM
    ecology, glm, mixed effects model, nested
    • Replies: 0
    • Views: 1,994
    05-26-2013, 08:29 AM Go to last post
  16. Power of a one sample t-test

    Hi all, I have a little problem with power calculations. I have calculated the power for a one sample Z test, which was fine. I found the critical...

    Started by NN_STAT‎, 05-26-2013 08:04 AM
    power
    • Replies: 0
    • Views: 2,251
    05-26-2013, 08:04 AM Go to last post
  17. Question help with exam

    Hey, i have an exam in 2 days about statistics for genome analysis and I'm having some troubles with some questions from an example exam. All help...

    Started by tijsrx‎, 05-25-2013 02:00 PM
    exam
    • Replies: 2
    • Views: 1,986
    05-25-2013, 04:43 PM Go to last post
  18. Expected Values of Random Variables

    Hi all, As you can imagine, I am working on this problem. Background In the carnival game Under-or-Over-Seven, a pair of fair dice is...

    Started by masterofchupi‎, 05-24-2013 06:08 PM
    • Replies: 1
    • Views: 6,523
    05-24-2013, 06:21 PM Go to last post
  19. How to find dependency between different variables in a data set?

    Hello, I have data about profitability of various companies. We have lot of additional details along with it like: 1) What is the company type...

    Started by SaurabhChandra‎, 05-24-2013 01:44 PM
    • Replies: 1
    • Views: 3,541
    05-24-2013, 03:27 PM Go to last post
  20. Result interpretation

    Pls someone should help to interprete my result for 2 way anova so as to compare with my own interpretation. My values are:The critical value of Fr...

    Started by naanah_imam@yahoo.com‎, 05-24-2013 02:30 PM
    dason, hlsmith
    • Replies: 2
    • Views: 1,196
    05-24-2013, 03:08 PM Go to last post
  21. compare F statistics vs P-values

    Hi I have a question about comparing F statistics among effects. I have the following anova table Parameter Estimate ...

    Started by szm‎, 05-23-2013 12:54 PM
    anova, comparison, f statistic
    • Replies: 7
    • Views: 3,245
    05-24-2013, 02:36 PM Go to last post
  22. statistical significance

    I am using McNemar's test to determine if a difference between two percentages is statistically significant. When comparing 100% versus 81.7%, I have...

    Started by EmmaS‎, 05-23-2013 03:46 AM
    • Replies: 4
    • Views: 1,496
    05-24-2013, 10:40 AM Go to last post
  23. Comparing percentages based on qualitative data

    Dear all, Could someone please advise me which test to use/how to compare two percentages that are based on qualitative data? I have searched SPSS...

    Started by ZoeT‎, 05-24-2013 05:16 AM
    • Replies: 1
    • Views: 1,466
    05-24-2013, 05:22 AM Go to last post
  24. Sample Categorization?

    Hello, I was wondering if you any of you knew what the best method would be for dividing a large sample (approx 30000) into 'categories'. This is...

    Started by pottersj‎, 05-22-2013 12:35 PM
    • Replies: 9
    • Views: 1,508
    05-24-2013, 05:12 AM Go to last post
  25. Question daily growth rates

    hello, a question from a relative novice in this whole field :) I am trying to evaluate the following: I have the number of daily visitors to a...

    Started by cbr‎, 05-24-2013 05:01 AM
    • Replies: 0
    • Views: 1,087
    05-24-2013, 05:01 AM Go to last post
  26. Distributions with different shapes in Mann-whitney

    Hey guys.. I'm working on this research and using Mann-whitney U test for data analysis. I encountered this situation where the shapes of the...

    Started by nicolai‎, 05-24-2013 12:14 AM
    #distributionshapes, #mann-whitney, #nonparametrictests, #statistics
    • Replies: 0
    • Views: 1,042
    05-24-2013, 12:14 AM Go to last post
  27. My sample has to much variability for me to know what to do

    I only took the calculus series at my university and I'm now in an ecology class. I have field data and I'm attempting to study the effect of...

    Started by organicartist‎, 05-23-2013 01:29 PM
    • Replies: 4
    • Views: 1,397
    05-23-2013, 04:48 PM Go to last post
  28. Logistic Regression and Panel data -Does it matter?

    Hello everyone. I am still very new to statistics and am having an issue. I am presented with a loan level data set (thousands of loans over a 10-20...

    Started by Anotherdream‎, 05-23-2013 09:35 AM
    • Replies: 0
    • Views: 1,338
    05-23-2013, 09:35 AM Go to last post
  29. Statictics Assistance needed

    Hi Im really stuck with a particular question regarding calculating confidence intervals. I dont expect anyone to solve it for me but just a push in...

    Started by Mischa23‎, 05-23-2013 04:38 AM
    confidence intervals, statistics
    • Replies: 1
    • Views: 1,237
    05-23-2013, 08:36 AM Go to last post
  30. Question How to analyze these tables?

    Dear Talk Stats community, I have some statistical data, but I am not sure of how to operate with it. As I am very new to statistics I appreciate...

    Started by Ryter‎, 05-23-2013 04:09 AM
    • Replies: 1
    • Views: 1,154
    05-23-2013, 08:13 AM Go to last post
  31. Normal curve and averages

    Hi, I am hoping this is a simple one. I have a normally distributed population with mean of 20 and standard deviation of 10. I want to look only...

    Started by sfischer‎, 05-23-2013 05:52 AM
    • Replies: 0
    • Views: 948
    05-23-2013, 05:52 AM Go to last post
  32. Calculation of impact of multiple variable on single event

    Hello all, I want to calculate impact of multiple variables acting on a single event. For example, Revenue of last year is 10 Crs and revenue...

    Started by shivangi.naik‎, 05-21-2013 08:28 AM
    • Replies: 3
    • Views: 1,291
    05-23-2013, 04:15 AM Go to last post
  33. Main effect not significant, interaction significant

    Hi, I've got some data which is normally distributed, and I have just run a two-way ANOVA on it, with two levels per group. The main effect is...

    Started by abacus‎, 05-22-2013 01:49 PM
    • Replies: 4
    • Views: 4,258
    05-22-2013, 08:27 PM Go to last post
  34. nonparametric linear regression

    Hi I would like to run a linear regression to predict variable X, however it is severely positively skewed and the usual transformations don't help...

    Started by Palermo‎, 05-20-2013 02:54 AM
    • Replies: 8
    • Views: 2,067
    05-22-2013, 08:01 PM Go to last post
  35. Independence Assumption Multiple Regression

    Hi. I have a hypothetical regression scenario to ask my question. Suppose I want to predict the total number of votes for Barack Obama and Mitt...

    Started by Ilfautque‎, 05-22-2013 07:52 PM
    • Replies: 0
    • Views: 1,068
    05-22-2013, 07:52 PM Go to last post
  36. Question collapsing a factor to see summarized levels of the other one (ANOVA?)

    Hi, in 2-factor analysis, is it possible to "collapse" a factor in order to have a clear view of the effect of the levels of the other factor?...

    Started by stablum‎, 05-22-2013 05:02 PM
    anova, factor
    • Replies: 0
    • Views: 937
    05-22-2013, 05:02 PM Go to last post
  37. pesky issue regarding percentile calculation

    Hi guys, I have this problem with percentiles, I have to write the code for them, and it's crashing when there are too less values in the table. ...

    Started by quantster‎, 05-22-2013 04:41 PM
    • Replies: 1
    • Views: 1,176
    05-22-2013, 05:01 PM Go to last post
  38. survey test

    I have two identical surveys (rated 1 to 7) - one for group 1 and the other for group 2. They were both asked 10 questions. I want to answer: 1)...

    Started by spider123‎, 05-21-2013 05:41 PM
    • Replies: 1
    • Views: 1,124
    05-22-2013, 04:39 PM Go to last post
  39. Questions concerning which test to use

    Hello everybody, At the moment I'm analyzing some data but I have some difficulties about which test I should use and I hope someone out there...

    Started by oliesjeik‎, 05-21-2013 03:38 PM
    • Replies: 3
    • Views: 1,598
    05-22-2013, 04:01 PM Go to last post
  40. Question evaluating the numerical influence of a factor in an ANOVA setting

    Hi, is there a way to calculate with precision the numerical influence of a factor in a 2-factor setting? Maybe using ANOVA? thanks!

    Started by stablum‎, 05-22-2013 03:57 PM
    anova, factors
    • Replies: 0
    • Views: 1,595
    05-22-2013, 03:57 PM Go to last post
  41. posts and MLE

    Suppose that the posts (each containing N words) of 20 newsgroups are generated the following way: first we randomly select the newsgroup, then we...

    Started by Kiuhnm‎, 05-22-2013 02:48 PM
    • Replies: 0
    • Views: 974
    05-22-2013, 02:48 PM Go to last post
  42. 2-Way Analysis when the DV is Bimodally Distribution

    Hello, I conducted a study with a 2X2 between-participants design. The DV is continuous but is theoretically assumed to be distributed bimodally,...

    Started by Oren S.‎, 05-14-2013 04:37 PM
    anova, bimodal, non-parametric test
    • Replies: 6
    • Views: 2,123
    05-22-2013, 10:23 AM Go to last post
  43. gaussian mixture

    Hello everyone, I have data which range from eg. 30 to 400 with no. of samples around 140 . These number belong to one or many component (from...

    Started by stats in biophysics‎, 05-22-2013 06:52 AM
    • Replies: 0
    • Views: 1,258
    05-22-2013, 06:52 AM Go to last post
  44. type of test for small sample size

    Hi there, I'm having problem in determining the correct test on a small grp (n=4). If i wanna compare on two different grp, control design and new...

    Started by Katherine99‎, 05-21-2013 11:17 PM
    • Replies: 1
    • Views: 1,139
    05-22-2013, 06:49 AM Go to last post
  45. Normalizing data

    Hello, I know I'm a bit simplify what supposed to be a bigger more complicated exam, but with the resources I currently dealing with, this is what...

    Started by atlant15‎, 05-22-2013 01:49 AM
    • Replies: 0
    • Views: 1,271
    05-22-2013, 01:49 AM Go to last post
  46. Test Type Help

    Can someone please help me? I just spent an hour writing a really detailed explanation of my stats project and it ended up getting deleted when I...

    Started by PsycoNova‎, 05-19-2013 09:48 PM
    proportion, statistics, test
    • Replies: 2
    • Views: 1,450
    05-21-2013, 11:25 PM Go to last post
  47. Overlapping Samples T-test

    Hi, Could someone please tell me how to do an overlapping samples t-test? In my survey, respondents rate (0 to 10) any of 10 options that they're...

    Started by ResearcherPat‎, 05-21-2013 02:30 PM
    means, overlapping, significance, t-test
    • Replies: 2
    • Views: 3,892
    05-21-2013, 05:24 PM Go to last post
  48. Kmeans Cluster - Changing Clusters with Additional Data

    Hi, I am running kmeans() in R and need help. I have a training data set which I separate into 7 clusters. I then predict the clusters for a...

    Started by bscully‎, 05-20-2013 12:07 PM
    • Replies: 3
    • Views: 5,292
    05-21-2013, 02:31 PM Go to last post
  49. Interpreting 'growth rate' of Gompertz 3P

    I collected insects over a 3 month period and converted my collections into Julian Dates to make distances between collections even (easier to use...

    Started by jhartsho‎, 05-21-2013 10:56 AM
    • Replies: 0
    • Views: 1,935
    05-21-2013, 10:56 AM Go to last post
  50. Is what I am trying to do even possible?

    Letís say I am a doctor and I am examining a patient for their life-time risk of developing mind cancer. I recently read two articles in the Journal...

    Started by InstableIguana‎, 05-20-2013 10:27 AM
    • Replies: 5
    • Views: 1,767
    05-21-2013, 08:56 AM Go to last post
  51. Augmented Dickey Fuller Test

    has been solved...

    Started by cze‎, 05-20-2013 12:05 PM
    • Replies: 0
    • Views: 861
    05-20-2013, 12:05 PM Go to last post
  52. Adjusted Beta from Multiple Logistic Regression vs Mantael Haenszel

    Hi all, I was wondering if I should expect the same OR from multiple logistic regression vs. the Mantael Haenszel from a 2x2 table and why. All...

    Started by lmartinnyc‎, 05-19-2013 05:25 PM
    • Replies: 2
    • Views: 1,281
    05-19-2013, 09:18 PM Go to last post
  53. Odds ratio/relative risk interpretation?

    If this is in the wrong section or is inappropriate then I apologise profusely. I have been fiddling around with SPSS and ran an odds ratio to...

    Started by newmember‎, 05-19-2013 08:38 AM
    • Replies: 3
    • Views: 996
    05-19-2013, 09:12 PM Go to last post
  54. Hypothesis testing question

    Question answered

    Started by jonesdesm‎, 05-19-2013 07:38 PM
    • Replies: 2
    • Views: 1,450
    05-19-2013, 08:09 PM Go to last post
  55. Discretize a continuous factor

    I have to do an exercise and I need help in a question. This is a part of that question: "Analyze the influence of the factor "width of wings"...

    Started by Badjoras‎, 05-19-2013 09:06 AM
    • Replies: 0
    • Views: 1,229
    05-19-2013, 09:06 AM Go to last post
  56. How many data rows can SPSS handle?

    In a few weeks an internet survey will hopefully start that should get a response rate of somewhere between 2 and 6 thousand people. I'm assuming the...

    Started by FrankC‎, 05-18-2013 02:16 PM
    spss, sql
    • Replies: 2
    • Views: 8,778
    05-18-2013, 04:06 PM Go to last post
  57. Computing the variables

    Hello everyone.. Please suggest.. After factor analysis, my scale factorized in to 3 factors such as knowledge creation, Knowledge sharing and...

    Started by ashima‎, 05-18-2013 02:29 AM
    • Replies: 0
    • Views: 849
    05-18-2013, 02:29 AM Go to last post
  58. Comparing histograms

    Hi all, I have two histograms, looking at the proportion of cases meeting a criteria in London and in England. When comparing histograms, say you...

    Started by skewif‎, 05-18-2013 12:52 AM
    • Replies: 0
    • Views: 1,024
    05-18-2013, 12:52 AM Go to last post
  59. Testin Additivity

    Hello everyone, does anyone know how you can test for additivity in a parametric regression model? For instance, if you have a regression model...

    Started by Taibo‎, 05-17-2013 05:58 AM
    • Replies: 7
    • Views: 1,519
    05-17-2013, 02:04 PM Go to last post
  60. Population vs. Sample Confidence Interval for Mean

    This has been confusing me for a while. I understand the difference between using data as population or sample but how would the equation for...

    Started by sak‎, 05-16-2013 02:13 PM
    • Replies: 1
    • Views: 1,606
    05-16-2013, 03:55 PM Go to last post

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