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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: 197,285
    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: 67,042
    09-30-2005, 09:44 AM Go to last post
  1. mid-class values

    The following table gives the ages in completed years of 141 persons in a town involved in road accidents during a particular year. Ages (years):...

    Started by furor celtica‎, 11-07-2010 04:26 AM
    • Replies: 7
    • Views: 9,421
    11-12-2010, 08:18 AM Go to last post
  2. Finding a least squares fit for f(x)=A*cos(Bx)

    Hello, I'm trying to derive the solutions for the estimates of A and B for the equation f(x)=A*cos(Bx) or ...cos(Bx+C) using least squares. I have...

    Started by leaf man‎, 07-03-2008 07:45 PM
    • Replies: 5
    • Views: 9,418
    07-06-2008, 11:37 PM Go to last post
  3. Question Effect size - cohen's d

    Hi everybody Who can help I got involved in an experiment at my college working on heart rates in horses before and after training. I think the...

    Started by sophie2cu2‎, 07-25-2008 11:15 AM
    • Replies: 2
    • Views: 9,395
    07-26-2008, 10:50 AM Go to last post
  4. Help

    My question is: Find the critical value Chi squared R corresponding to a sample size of 3 and a confidence level of 95 percent. I know that...

    Started by 1NAMILL‎, 11-04-2005 04:08 PM
    • Replies: 3
    • Views: 9,386
    11-04-2005, 05:25 PM Go to last post
  5. Meaning of P-value when generating Pearson's R correlation coefficient ???

    I know how to generate Pearson's r correlation values in Excel and in R. I understand the meaning of the value as it ranges from -1<r<1 I also...

    Started by CrunchAndSee‎, 01-02-2015 08:12 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 9,377
    01-14-2015, 12:01 PM Go to last post
  6. Relationship b/w correlation and skewness

    Hello I am currently working on network project an i m finding out correlation b/w data. My project supervisor suggested that correlation...

    Started by fahdnoor‎, 08-22-2008 11:57 AM
    • Replies: 3
    • Views: 9,374
    08-24-2008, 11:09 AM Go to last post
  7. Partial Eta squared - how large is it?

    Hi! I need some help in interpreting the partial eta squared in a MANCOVA. I know that it accounts for the variavence on the DV due to de IV...

    Started by Mariana Ramos‎, 04-26-2010 08:54 AM
    • Replies: 1
    • Views: 9,371
    04-26-2010, 09:59 PM Go to last post
  8. hypothesis testing

    I need help learning this. I know how to come up with the null and alternative statements but i don't know how to determine which one is the the...

    Started by FB99‎, 01-28-2007 11:12 AM
    • Replies: 1
    • Views: 9,364
    01-28-2007, 11:24 AM Go to last post
  9. Experimental design...plz help !!

    1) A corporation employs 2000 male and 500 female engineers. A stratified random sample of 200 male and 50 female engineers gives each engineer 1...

    Started by xjinax8807‎, 11-04-2006 04:56 PM
    • Replies: 3
    • Views: 9,359
    11-05-2006, 11:32 PM Go to last post
  10. Question Chi-square (χ2) test a small dilemma

    I used Chi-square (χ2) test to investigate the statistical significance of differences of opinion about the students offered the choice of...

    Started by markecb‎, 02-12-2014 01:16 AM
    • Replies: 0
    • Views: 9,326
    02-12-2014, 01:16 AM Go to last post
  11. Chisquared equivalent for 2x5 table?

    Hi, I have a quick question re: analysing a dataset. The resulting table is 5 rows (a,b,c,d,e) and 2 columns (yes/no). I would like to determine...

    Started by lee_alkureishi‎, 01-21-2009 10:45 PM
    • Replies: 9
    • Views: 9,324
    01-26-2009, 04:02 PM Go to last post
  12. what is the meaning of the N-1 in standard deviation

    Hi Just to understand the role of N-1 in the standard deviation formula, I've done the following experiment. 1. Take a set of values and...

    Started by bsaikrishna‎, 01-21-2011 02:26 AM
    • Replies: 2
    • Views: 9,321
    01-21-2011, 10:19 AM Go to last post
  13. Testing the difference between two reliability statistics: ICC vs. kappa

    Dear all, I would like to test if the interobserver reliabilities of two assessments differ significantly. The problem is: the assessments are...

    Started by Barmless‎, 01-26-2009 01:23 PM
    • Replies: 1
    • Views: 9,314
    01-26-2009, 02:00 PM Go to last post
  14. [need help] example Variogram in excel

    Hi All ! im newbie here ^^ I need example of creating variogram in excel.. Any help is very welcome. Thanking in advance. Kind regards,...

    Started by erikyoga‎, 03-10-2011 08:49 AM
    • Replies: 1
    • Views: 9,310
    03-10-2011, 12:33 PM Go to last post
  15. Does having too many variables in a regression affect the R^2 result?

    Right now I have 1 variable that I need to predict the outcome of and 18 possible independent variables. When I ran the analysis, the R^2 value was...

    Started by david_q‎, 02-15-2012 07:31 AM
    • Replies: 9
    • Views: 9,282
    02-15-2012, 02:00 PM Go to last post
  16. Data will not normalize & need to run ANOVA

    Hello, I have a set of data that I need to run a 2-way ANOVA on. My data is very highly skewed to the right, so it does not follow a normal...

    Started by Lizzbee‎, 02-22-2013 05:31 PM
    anova, minitab, normality, sigmaplot, transformations
    • Replies: 6
    • Views: 9,272
    02-22-2013, 06:55 PM Go to last post
  17. Online Statistics Resources

    Statistics textbooks: Concepts and Applications of Inferential Statistics HyperStat Online Electronic Statistics Textbook DIG Stats

    Started by quark‎, 11-12-2005 05:40 PM
    • Replies: 1
    • Views: 9,267
    06-12-2012, 11:59 PM Go to last post
  18. statistics for dummies

    Hi All: I am not a math person and know very littel about statistics. I have conducted an experiment by dividing my students randomly into two...

    Started by nonmath‎, 01-12-2008 09:27 AM
    • Replies: 1
    • Views: 9,266
    01-15-2008, 01:44 AM Go to last post
  19. Significance level. Critical Value approach

    Help please. All i need is to know what formula to use with this question and i will be ok. There are so many and i have been stuck for days. ...

    Started by sweetx‎, 03-11-2009 09:13 AM
    • Replies: 3
    • Views: 9,262
    03-13-2009, 02:50 PM Go to last post
  20. Interpreting factor loadings

    Hi, I tried running factor analysis using correlations matrix as input data - used varimax to get orthogonal factors. How do I read the...

    Started by jyoti59n‎, 12-28-2011 07:12 AM
    • Replies: 3
    • Views: 9,247
    12-29-2011, 10:10 AM Go to last post
  21. Calculating average annual percentage change for trend data

    Hi I'm a student with prescription medication use data and I am analyzing trends in use between 1996 and 2005. Specifically, my data are...

    Started by minnes‎, 02-23-2009 06:56 PM
    • Replies: 0
    • Views: 9,240
    02-23-2009, 06:56 PM Go to last post
  22. Hypothesis testing???

    Hi, I have a homework problem I need help with...if anyone could help or even point me in the direction of similar examples, I would be grateful! I...

    Started by tiffalala‎, 10-04-2014 12:30 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,237
    10-05-2014, 03:38 AM Go to last post
  23. Faster Binomial distribution

    I have question to do that would require me to write out about a page of binomial distribution equations. I am wondering if there is a better way to...

    Started by BaalHacks‎, 02-18-2011 04:19 PM
    • Replies: 6
    • Views: 9,232
    02-22-2011, 01:58 PM Go to last post
  24. Explain standard deviation formula

    Hi all, We take the square root of variance to get the standard deviation, right? And the reason is that variance units are in square terms....

    Started by beemzet‎, 11-28-2009 05:34 PM
    • Replies: 7
    • Views: 9,227
    09-12-2010, 12:44 PM Go to last post
  25. Multiple Regression: How to obtain VIF values from correlation coefficient

    I understand that VIF = 1 / (1-R^2) If I only have the parameter estimates table with the intercept, X1, and X2 and also the correlation...

    Started by IneedHELPbadly‎, 10-27-2011 03:02 PM
    anova, correlation coefficient, multiple regression, parameter estimates, vif
    • Replies: 3
    • Views: 9,204
    10-28-2011, 09:13 AM Go to last post
  26. Theil U statIstic

    Hey I was doing an assignment and my professor want Theil U stat for validation purpose of the forecasting that i have done .Can anyone please...

    Started by jayaramg‎, 10-01-2009 07:14 PM
    • Replies: 1
    • Views: 9,203
    10-02-2009, 11:15 AM Go to last post
  27. degrees of freedom for residuals in Anova

    Hi, I want to establish if this method is correct to find the degrees of freedom for the anova residuals. say t treatments with r replicates. ...

    Started by PeterVincent‎, 12-05-2009 08:09 AM
    • Replies: 6
    • Views: 9,198
    12-05-2009, 11:19 AM Go to last post
  28. Relation between gamma function and exponential function

    Hi All, Can someone help me understand the relation between the gamma function and exponential function, please? Basically, I am trying to figure...

    Started by MonitorStats‎, 04-27-2009 04:13 AM
    • Replies: 2
    • Views: 9,195
    04-27-2009, 10:39 AM Go to last post
  29. Confirmatory Factor Analysis: Appropriateness and interpretation

    Greetings, all! I am working on the statistics for my dissertation, and while it seems that confirmatory factor analysis fits my needs based on...

    Started by shawn‎, 06-15-2011 06:43 PM
    cfa, factor analysis
    • Replies: 2
    • Views: 9,189
    06-16-2011, 10:30 AM Go to last post
  30. 95% confidence interval help

    How much money does the average professional football fan spend on food at a single football game? That question was posed to ten randomly selected...

    Started by sinful‎, 10-25-2006 04:50 PM
    • Replies: 8
    • Views: 9,179
    10-25-2006, 09:36 PM Go to last post
  31. Norms and standardization

    As a starter, my question is very simple. How to apply norms and standardize a test. I have two tools - One with 120 items and another with...

    Started by rockyallen7771‎, 11-05-2010 12:35 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 9,178
    11-08-2010, 08:19 AM Go to last post
  32. Exclamation tukee formula for outliers

    what is it? can't find it.

    Started by hectex‎, 10-21-2007 04:03 PM
    • Replies: 1
    • Views: 9,171
    10-22-2007, 08:34 AM Go to last post
  33. Nonparametric version of MANOVA in SPSS

    Does anyone know how to run a multiple DV nonparametric version of a MANOVA in SPSS? I see that you can select Analyze/Nonparametric Tests/K...

    Started by jrkuhn‎, 07-16-2009 03:30 PM
    • Replies: 1
    • Views: 9,167
    07-16-2009, 11:32 PM Go to last post
  34. Cronbach's coefficient alpha

    Hi, I'm calculating cronbach's coefficient alpha for items on a newly constructed test consisting of likert scale items. The frequency of...

    Started by CharmSchool‎, 06-19-2009 12:09 AM
    • Replies: 4
    • Views: 9,165
    06-19-2009, 08:11 PM Go to last post
  35. Likelihood Likert Scale, No of Items?

    Hello everyone, i am creating a survey and there will be a certain question such as "Would you suggest this to the others?" Obviously i could...

    Started by micdhack‎, 08-21-2011 02:16 PM
    • Replies: 14
    • Views: 9,162
    08-23-2011, 04:32 PM Go to last post
  36. Technical replicates vs. biological replicates

    I've done a lot of reading on hypothesis testing and I can't find the answer to this question: What is the standard way to handle variation in...

    Started by Orngarth‎, 05-21-2008 07:09 PM
    • Replies: 2
    • Views: 9,159
    05-22-2008, 12:57 AM Go to last post
  37. Nonparametric equivalent for (factorial) MANOVA?

    I once had some experience in SPSS/statistical testing, but now I really need it, I cannot seem to find the appropriate tests. I hope anyone can...

    Started by owj_315‎, 07-07-2011 02:07 PM
    • Replies: 8
    • Views: 9,154
    07-08-2011, 08:40 AM Go to last post
  38. Question Please Help with probabilities.....

    A study at a college in the west coast reveals that, historically, 45% of their students are minority students. If random samples of size 75 are...

    Started by Blevil‎, 07-14-2010 06:26 AM
    • Replies: 6
    • Views: 9,150
    07-14-2010, 05:55 PM Go to last post
  39. What is oversampling?

    Hi, Please help me understand this paragraph. "Your response rate is anticipated before you carry out your sample selection, so you need to...

    Started by SadieKhan‎, 04-28-2011 12:44 PM
    • Replies: 2
    • Views: 9,130
    04-28-2011, 10:46 PM Go to last post
  40. Multiple, Single Sample t-tests (and Wilcoxon)

    Hi everyone, I have an experiement with several groups of animals that have all received a different treatment and each group is subsequently...

    Started by Drosophila‎, 11-18-2009 06:50 AM
    • Replies: 3
    • Views: 9,097
    11-19-2009, 08:43 AM Go to last post
  41. Tukey's HSD formulas

    I am analyzing real-world temperature data which came out significantly different in the ANOVAs. There seem to be two formulas for the Tukey's HSD...

    Started by hjulich‎, 09-28-2010 11:13 PM
    • Replies: 2
    • Views: 9,089
    09-28-2010, 11:34 PM Go to last post
  42. urgent help required in stats

    I need only explanation to these basic level questions for my son 1. The archaeological site of Tara is more than 4,000 years old. Tradition...

    Started by hammad_arshad‎, 07-15-2007 09:31 PM
    • Replies: 0
    • Views: 9,080
    07-15-2007, 09:31 PM Go to last post
  43. Exclamation Winsorizing data

    Hi there, I already checked the two other threads about winsorizing, but it didn't solve my problem. I have a dataset for OLS regression and...

    Started by fxen3k‎, 11-03-2012 04:04 AM
    • Replies: 2
    • Views: 9,049
    11-03-2012, 06:07 AM Go to last post
  44. Confidence Interval Help

    Hello :) I have a question in my homework that states: "Lorraine computed a confidence interval for μ based on a sample size of 41. Since she...

    Started by Gina77‎, 04-16-2014 10:46 AM
    • Replies: 3
    • Views: 9,044
    04-16-2014, 03:11 PM Go to last post
  45. t- and F- values of correlation efficients

    What are the data sets that are used in finding t-value and F-value of correlation coefficients? If the correlation coefficient for X data set and Y...

    Started by Dr.Appalayya‎, 08-05-2010 06:24 AM
    • Replies: 11
    • Views: 9,042
    08-13-2010, 11:55 AM Go to last post
  46. kolmogorov smirnov interpretation significance level

    Hi, I used the kolmogorov smirnov(K-S) test in order to determine if a experimental distribution fits a power law distribution. I get the...

    Started by dirkheld‎, 06-19-2009 09:03 AM
    • Replies: 0
    • Views: 9,033
    06-19-2009, 09:03 AM Go to last post
  47. AMOS - fit indices for nonnormal data

    Dear all, I've am struggling on a CFA in AMOS conducted on multivariate nonnormal data. I want to identify the factorial structure that best...

    Started by Daea‎, 10-29-2012 06:23 PM
    • Replies: 3
    • Views: 9,026
    10-30-2012, 08:04 AM Go to last post
  48. Bayesian Statistics Question

    My current state is that I am clueless and have no idea what to do with it. Could somebody provide me some knowledge of how to start with this?

    Started by MegaMan‎, 12-08-2011 06:22 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 51
    • Views: 9,014
    12-12-2011, 11:49 AM Go to last post
  49. Finding Quartiles in a normal distribution

    How would one find quartiles in a normal distribution with mean and standard deviation other that (0,1)?

    Started by Samar‎, 03-24-2012 01:11 AM
    • Replies: 1
    • Views: 9,014
    03-24-2012, 10:54 AM Go to last post
  50. Comparing two groups of percentages

    Hello! First a bit of background: I am trying to compare the performance of two groups of people (A and B) on various simple tasks that require...

    Started by Thorr‎, 02-11-2009 12:01 PM
    • Replies: 2
    • Views: 8,995
    02-12-2009, 05:01 AM Go to last post
  51. Red face Fisher's exact and Yates' correction for continuity

    i got a bit confused, could any one remine me please, when to use Fisher's exact and Yates' correction for continuity in 2x2 tale with one or more...

    Started by nurul‎, 08-16-2010 11:09 PM
    • Replies: 2
    • Views: 8,984
    08-16-2010, 11:38 PM Go to last post
  52. ANOVA interactions,Tukey HSD

    Hello I am analyzing behavioral data on face processing. This is a within-subject 3x2x2 design. When I run repeated-measure ANOVA, I obtain...

    Started by valgo3117‎, 09-17-2008 05:59 AM
    • Replies: 1
    • Views: 8,974
    09-17-2008, 09:15 AM Go to last post
  53. Writing results from transformed data - help needed asap

    Hello Sorry if this is a silly question but I am fairly new to writing up reports using transformed data and would be very grateful if someone...

    Started by gemma7‎, 08-28-2008 06:01 PM
    • Replies: 1
    • Views: 8,970
    08-28-2008, 08:06 PM Go to last post
  54. What is/are Latent Dimension(s)

    In the following description of Discriminant Analyses, what is meant by "latent dimensions"? "It is a multivariate technique that considers the...

    Started by hlsmith‎, 08-17-2012 03:45 PM
    • Replies: 5
    • Views: 8,963
    08-18-2012, 07:24 PM Go to last post
  55. Data independent and identically distributed... How to prove it?

    Hello everybody! I am running a frequency analysis of flood and wind speed, for which the data are assumed to be independent and identically...

    Started by af_231‎, 11-18-2011 02:11 AM
    • Replies: 3
    • Views: 8,961
    11-18-2011, 11:26 AM Go to last post
  56. confidence interval for covariance estimation

    Is it possible to calculate the confidence interval for the sample covariance estimation of two random variables? The two random variables can be...

    Started by brakepad‎, 05-31-2010 08:29 PM
    • Replies: 4
    • Views: 8,954
    06-01-2010, 01:56 PM Go to last post
  57. Sample Size.. to generalize sample out to the population

    Hi all, Here, I ask your advise to overcome this, currently, I am working on master research, the aim of the research is to study the users...

    Started by MKAMER‎, 08-28-2012 08:32 AM
    • Replies: 9
    • Views: 8,941
    08-29-2012, 12:53 AM Go to last post
  58. Distribution of MLE

    Hey guys how are you? I have the following question: Let X1,X2,...,Xn be a random sample from a Pareto distribution having pdf f(x|b)=...

    Started by Darktranquillity‎, 10-26-2011 06:15 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 8,933
    10-30-2011, 04:53 PM Go to last post
  59. Please someone help me

    4. A political strategist believes that 58% of voters in a certain state support his candidate. He then commissions a poll of 600 voters and 53% of...

    Started by benchiefjr‎, 11-11-2006 11:00 PM
    • Replies: 2
    • Views: 8,924
    11-13-2006, 12:29 AM Go to last post
  60. Comparing variable frequency in groups=help!

    Hi, I am in need of desperate help. I have collected data consisting of frequencies of aggression in a group of chickens according to different...

    Started by Thomas-Smyth‎, 02-23-2011 04:30 PM
    chi-squared, frequency, spss
    • Replies: 4
    • Views: 8,917
    02-23-2011, 05:06 PM Go to last post

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