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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,946
    09-30-2005, 09:44 AM Go to last post
  2. 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: 197,161
    07-16-2014, 11:01 AM Go to last post
  1. Likert Scale - Regression Analysis HELP!

    I'm contemplating running a regression analysis on Likert scale constructs. My independent variable would be workspace and dependent variable would...

    Started by adda_kadabra‎, 03-28-2010 06:36 PM
    • Replies: 0
    • Views: 3,486
    03-28-2010, 06:36 PM Go to last post
  2. View/calculate factor loadings - Amos

    I don't know what I should be looking for to find/calculate factor loadings in Amos. Help!

    Started by adda_kadabra‎, 04-14-2010 07:58 AM
    • Replies: 0
    • Views: 5,675
    04-14-2010, 07:58 AM Go to last post
  3. Interpretation of an Interaction Variable in a Quadratic Regression

    Hello everyone, this is my first post in this forum and I really hope you can help me with the interpretation of my data. I am currently writing...

    Started by Adde‎, 06-05-2011 08:58 AM
    • Replies: 0
    • Views: 3,818
    06-05-2011, 08:58 AM Go to last post
  4. Rasch Issue

    I'm having some issues with a rasch analysis I'm doing. First off, I'm using the raschtest .ado in stata. I'm trying to reduce 50 items to about 20....

    Started by addicted2stats‎, 04-05-2011 11:16 AM
    • Replies: 0
    • Views: 2,433
    04-05-2011, 11:16 AM Go to last post
  5. sigma level

    OK, I need just a little help and all I can find are calculators that will do the work for me. Maybe I am not asking the correct questions. He is...

    Started by addision‎, 09-09-2009 03:28 PM
    • Replies: 2
    • Views: 1,904
    09-10-2009, 03:16 AM Go to last post
  6. connection with distinguishable permutations

    The answer I'm trying to figure out is for this question: Find the classical probability of getting a total of 12 when 5 balanced dice are rolled....

    Started by addysdaddy‎, 10-13-2010 12:27 PM
    • Replies: 1
    • Views: 2,415
    10-13-2010, 11:57 PM Go to last post
  7. determining mean without Z score

    Hello, Not looking for the answer, I've just got myself confused. The scenario I have is: I have been given the Standard deviation figure 14.62...

    Started by Ade‎, 05-17-2006 02:25 AM
    • Replies: 4
    • Views: 2,910
    05-22-2006, 09:02 PM Go to last post
  8. plz help me in solving these 2 probs

    I have 2 problems as my assignement and i have to submit them within 5 hours please reply me plz plz plz PROBLEM 1 Muhammad Ali is famous in...

    Started by adeelmushtaaq‎, 03-23-2008 08:53 AM
    • Replies: 0
    • Views: 2,303
    03-23-2008, 08:53 AM Go to last post
  9. Needing some assistance with this problem (true proportion)

    Here's the problem: A U.S. Travel Data Center's survey of 1500 adults found taht 42% of respondents stated that they favor historical sites as...

    Started by adegrasse‎, 10-06-2006 08:07 PM
    • Replies: 1
    • Views: 5,903
    10-07-2006, 08:41 AM Go to last post
  10. Joint Distribution

    Hi everyone, I've got a problem with a joint probability density function question. Given f(x, y) = e^-(x+y), 0 <= x < ∞ , 0 <= y < ∞ , and...

    Started by adegroat‎, 10-07-2015 01:48 AM
    joint density function, joint distribution
    • Replies: 0
    • Views: 945
    10-07-2015, 01:48 AM Go to last post
  11. Where can I find real data for ANOVA for a project?

    Where can I find real data for ANOVA for a project? I have my semester project due soon and I need to get real life data to use for the analysis. I...

    Started by adejames2000‎, 10-18-2013 05:54 PM
    data, data analysis, data analytics, data entry, data generation
    • Replies: 2
    • Views: 1,499
    10-19-2013, 06:51 AM Go to last post
  12. The test statistics for the treatment and staging of a disease

    What is the test statistics that used to tell whether a particular treatment is effective in altering the staging of a particular disease, typically...

    Started by adel‎, 07-13-2013 03:13 PM
    • Replies: 0
    • Views: 1,187
    07-13-2013, 03:13 PM Go to last post
  13. Which test can I use ?

    I am doing an analysis for collected data of experimental designe using control group, but my participants in the pre-test group are not the same...

    Started by AdelA‎, 02-17-2014 02:07 PM
    • Replies: 5
    • Views: 1,757
    02-18-2014, 01:38 PM Go to last post
  14. Metric to estimate the allowable error/noise in repeated measurments

    Hello, I perform two measurements of a variable once a week and I measured a 10.5% difference from week 1 to week 2. How can I tell if the...

    Started by Adelehony‎, 06-12-2013 07:24 PM
    • Replies: 0
    • Views: 1,227
    06-12-2013, 07:24 PM Go to last post
  15. T-test and large but unequal sample sizes

    Hi, I'm working with a very large data set and would like to compare two independent populations. For the first population, I have approximately...

    Started by adelwich‎, 04-05-2011 10:25 AM
    • Replies: 2
    • Views: 14,568
    04-05-2011, 04:03 PM Go to last post
  16. Making claims about effect size

    Hi, I'm working with a very large sample, and have realized that almost any blip in the data will register as p=0.000 due to the sample size. Of...

    Started by adelwich‎, 04-06-2011 10:46 AM
    cohen's d, cramer's v, effect size
    • Replies: 0
    • Views: 2,723
    04-06-2011, 10:46 AM Go to last post
  17. Null hypothesis question

    Hi, I'm new here, so I hope someone can help. I've read to the point of numbness. Can anyone offer advice? I understand fully the concept of...

    Started by adge666‎, 04-09-2009 07:03 PM
    • Replies: 0
    • Views: 1,721
    04-09-2009, 07:03 PM Go to last post
  18. Order of Statistics - Joint Density Function

    Hello, I have a problem that I just can't seem to solve. Suppose X1; X2; : : : ; Xn constitute a random sample of an in finite population with...

    Started by adhbrown‎, 12-07-2010 10:27 PM
    • Replies: 1
    • Views: 5,063
    12-08-2010, 01:53 AM Go to last post
  19. interpreting correlations of factors within a questionnaire

    Good day I have received stats from my university that I need to interpret but without guidelines. I need help with one in particular: It is about...

    Started by Adi010‎, 09-27-2017 07:38 AM
    • Replies: 5
    • Views: 184
    09-30-2017, 07:59 AM Go to last post
  20. Help needed for spatial statistics - linearity problem

    I am a final year Environmental Geoscience BSc student, currently engaged in a dissertation project on synsedimentary fracturing in carbonates. I...

    Started by Adibaba‎, 12-28-2006 05:59 AM
    • Replies: 0
    • Views: 1,739
    12-28-2006, 05:59 AM Go to last post
  21. Steer me in the right direction??? please please!!!!

    ive been trying for a while and everytime i try to figure it out it seems like im lacking the sample size. Can someone please please please please...

    Started by adidas01‎, 02-23-2008 04:17 PM
    • Replies: 2
    • Views: 6,455
    02-23-2008, 06:01 PM Go to last post
  22. Thanks for the last help!!! i figured it out! one more question please...

    I think im supposed to use the anova test but are there any other similar examples i can look at?? The accompanying table shows the grades for...

    Started by adidas01‎, 02-23-2008 09:18 PM
    • Replies: 1
    • Views: 2,439
    02-24-2008, 08:39 AM Go to last post
  23. Unhappy Goodness of Fit Tests Using Excel

    I have been working through a study guide on tests of goodness of fit and independence. My book Modern Business Statistics and my study group have...

    Started by adie1231‎, 02-11-2011 02:53 PM
    • Replies: 1
    • Views: 7,016
    02-11-2011, 03:18 PM Go to last post
  24. Angry Help

    I'm taking Knowledge management class as part of my MBA , i have dataset of newspaper print depreciation (daily data from Jan. 2002 to Dec. 2009)...

    Started by adma76‎, 02-11-2010 04:35 PM
    • Replies: 2
    • Views: 1,743
    02-11-2010, 06:40 PM Go to last post
  25. Basic Statitics to Probability Problem

    Hi all, I’m new to the site, and only have a very basic understanding of statistics and probability, so forgive me if this question sounds silly....

    Started by Admonty‎, 07-18-2015 11:28 PM
    • Replies: 0
    • Views: 1,081
    07-18-2015, 11:28 PM Go to last post
  26. Calculating % Deviance Explained from JMP

    Hello. I am hoping someone might be able to help me. I am interested in calculating the % deviance explained by several different models in the GLM...

    Started by Adnan23‎, 09-13-2008 03:18 PM
    • Replies: 0
    • Views: 2,981
    09-13-2008, 03:18 PM Go to last post
  27. Dummy Variables

    I have a question regarding Dummy Variables.. Never been good at it.. Question is like this.. Create the dummy variable for Education Level. ...

    Started by adrian.bastian‎, 10-25-2012 07:35 PM
    dummy variables, estimated equation, regression
    • Replies: 0
    • Views: 2,166
    10-25-2012, 07:35 PM Go to last post
  28. Which analysis to use?

    I work in advertising and it's been a few years since my last stats class (I took two in my undergrad). So, here's the setup: my company will be...

    Started by AdrianP‎, 02-20-2009 09:54 AM
    • Replies: 1
    • Views: 1,999
    02-26-2009, 03:33 AM Go to last post
  29. homogeneity of variance with a MANOVA: what test?

    hello, i have to realize a MANOVA for my thesis and i would like to know how can i test if the variances are homogen? can i use levene's test like...

    Started by adrienbaudouin‎, 06-22-2010 01:33 PM
    • Replies: 2
    • Views: 6,492
    06-25-2010, 09:05 AM Go to last post
  30. Correlation: yes or no?

    Hey! Are two variables significantly positively correlated, if SPSS gives me the following Output: Correlation Coefficient: 0.085** Sig....

    Started by adrosta‎, 07-12-2013 05:32 PM
    • Replies: 2
    • Views: 3,179
    07-14-2013, 08:37 PM Go to last post
  31. Normalizing short sample stats

    Hi, I am trying to use previous game stats in NCAA basketball games, to predict future games all in the same season. By the end of the season,...

    Started by adsxvii‎, 01-22-2009 09:50 AM
    • Replies: 0
    • Views: 2,468
    01-22-2009, 09:50 AM Go to last post
  32. Having a hard time with hypothesis testing...

    A group of 25 husbands and wives were chosen randomly. Each person was asked to indicate the most he or she would be willing to pay for a new car...

    Started by adumau‎, 11-05-2011 02:42 PM
    • Replies: 1
    • Views: 3,539
    11-05-2011, 04:52 PM Go to last post
  33. Mode, non-normal distribution and Chi square

    Hello. I would greatly appreciate help from you guys, since I'm kind of stuck. I got the following question: If I have two non normal...

    Started by AdviceNeeded‎, 02-03-2011 08:07 PM
    • Replies: 6
    • Views: 4,979
    02-04-2011, 10:02 PM Go to last post
  34. Question [Solved] f(x) > 1 ???

    I'm using kernal desnity estimation for the first time. I plotted the density that I got using R's density() function and noticed that portions of...

    Started by advla‎, 10-15-2011 09:55 PM
    • Replies: 3
    • Views: 2,836
    10-21-2011, 10:11 PM Go to last post
  35. Welch–Satterthwaite equation: proof or derivation?

    Hi, I'm studying now the Welch's t-test in which we use the Welch–Satterthwaite equation to calculate the degrees of freedom of the approxiamate...

    Started by advmc‎, 07-17-2010 02:52 PM
    • Replies: 3
    • Views: 109,307
    07-18-2010, 01:19 PM Go to last post
  36. Cochran's theorem

    Hi, I found once again a non proved important theorem, Cochran's theorem, in the introduction of ANOVA decomposition of the sum of squares...

    Started by advmc‎, 07-19-2010 12:11 PM
    • Replies: 3
    • Views: 5,638
    07-19-2010, 03:24 PM Go to last post
  37. a theorem about pôwer transformation

    Hi, while studying on Montgomery's Design and Analysis of experiments, i saw a theorem without proof of which I don't find the correct references....

    Started by advmc‎, 08-09-2010 02:43 PM
    • Replies: 1
    • Views: 82,891
    08-09-2010, 03:11 PM Go to last post
  38. Discrete or Continuous?

    Hello, I've got a question about the use of temperature as a factor in a two-factor design. Should it be treated as a continuous or discrete? ...

    Started by AdvoTDV‎, 12-09-2008 11:16 PM
    • Replies: 1
    • Views: 2,905
    12-10-2008, 01:24 AM Go to last post
  39. Question Spearman's rho or no? is one of my datasets non-monotonic?

    Hi, I'm dyslexic with limited stat education (and the internet is not helping thus far) and I'm having horrible trouble understanding what tests I...

    Started by adyslexicsnemesis‎, 08-12-2016 03:33 PM
    association, correlation, nonlinear, spearman's rho
    • Replies: 1
    • Views: 1,465
    08-13-2016, 09:18 AM Go to last post
  40. Proof for multiple regression R^2

    Hi, I am trying to prove that R2 is the sample squared correlation of yhat and yi, preferably by SS decomposition. I only know how to prove this...

    Started by aeb‎, 10-21-2010 01:48 AM
    • Replies: 0
    • Views: 4,382
    10-21-2010, 01:48 AM Go to last post
  41. Is this integration right or wrong...yes or no?

    I haven't had calc in a few years and it's not coming back very easily: Are either of these correct?

    Started by Aegis‎, 10-24-2006 05:12 AM
    • Replies: 1
    • Views: 2,766
    10-24-2006, 06:25 AM Go to last post
  42. Problem involving stocks and upper limits

    The scenario is as follows: If these criteria are met, the club will issue one new share at a price of $1,000 for every two average attendees between...

    Started by Aeicha‎, 11-20-2010 10:22 PM
    • Replies: 0
    • Views: 3,007
    11-20-2010, 10:22 PM Go to last post
  43. Smile Regression Help!!

    I am doing some econometrics work aiming to build a good regression model and I was wondering is it possible to have a Lin-Log regression were only...

    Started by AEJD90‎, 04-28-2012 08:00 PM
    regression
    • Replies: 1
    • Views: 1,346
    04-28-2012, 08:02 PM Go to last post
  44. Polynomial regression help!

    When performing a regression which includes a sqaure term what is it exactly that this term is showing for exmaple regressing price against weight...

    Started by AEJD90‎, 04-29-2012 06:44 PM
    • Replies: 0
    • Views: 2,205
    04-29-2012, 06:44 PM Go to last post
  45. Rating scales -- meaningful summary

    What is the most meaningful analyses for rating scale (5 point) data? I want to compare attitudes before and after an intervention. I am using Calc...

    Started by aeliana‎, 03-09-2012 11:21 AM
    • Replies: 0
    • Views: 1,574
    03-09-2012, 11:21 AM Go to last post
  46. Unhappy Factor analysis question

    I am working on a project where I need to write Business Requirements for how to take a raw data file, run factor analysis against it and then output...

    Started by aelliott54‎, 11-16-2011 05:02 PM
    api, factor analysis, software
    • Replies: 5
    • Views: 2,206
    11-17-2011, 03:40 PM Go to last post
  47. I don't understand the results of my ANOVA

    I have run general linear model (ANOVA) in SPSS to test whether habitat type (2 categories) and habitat disturbance (2 categories) have an effect on...

    Started by aelw‎, 04-30-2014 02:35 PM
    anova, biology, ecology
    • Replies: 1
    • Views: 1,075
    04-30-2014, 03:39 PM Go to last post
  48. Stat101 y-intercept of regression line

    Slope of regresson line is 1.4, the mean of x-values is 5.0, mean of y-values is 6.5. What is the y-intercept of regression line?

    Started by aenyiema‎, 09-09-2009 08:16 AM
    • Replies: 3
    • Views: 19,129
    09-09-2009, 11:29 AM Go to last post
  49. Stat101 expected value

    Random sample of 200 people chosen and doy of week of birth is recorded. What is the expected value for the numbers of births for each day of the...

    Started by aenyiema‎, 09-09-2009 08:12 AM
    • Replies: 0
    • Views: 1,735
    09-09-2009, 08:12 AM Go to last post
  50. Stat101 Standard Deviation of sample mean

    What is the SD of sample mean, given a population SDof 7.36 and a sample size of 30? I just need to verify that the formula is population...

    Started by aenyiema‎, 09-09-2009 05:11 PM
    • Replies: 1
    • Views: 3,565
    09-09-2009, 09:16 PM Go to last post
  51. Stat101 95% Confidence Interval

    One compared the fertility rate of frogs in two ponds. Suppose p1 denotes fertility rate in Pond1 and p2 denotes fertiliity rate in Pond2. which of...

    Started by aenyiema‎, 09-09-2009 05:40 PM
    • Replies: 6
    • Views: 2,644
    09-11-2009, 07:59 AM Go to last post
  52. STAT101 Scatterplot quiz. Just need verification

    A scatterplot is best used with which type of data analysis? Pearson r, one-way ANOVA, independent t-test, chi-square I picked pearson r because...

    Started by aenyiema‎, 09-10-2009 01:37 PM
    • Replies: 1
    • Views: 2,614
    09-10-2009, 05:58 PM Go to last post
  53. Overlapping error bars and p <0.05

    Hi, I have a column chart which represents two means and their error bars (standard deviation), the two error bars overlap of about half of their...

    Started by aep251‎, 09-21-2011 04:44 AM
    • Replies: 4
    • Views: 5,971
    09-21-2011, 11:36 AM Go to last post
  54. Quick question on tukey's HSD

    Using JMP If I run an ANOVA on ranked data (for Kruskal Wallis) and then perform Tukey's HSD, do I need to adjust alpha from 0.05? I have 4 groups....

    Started by aesopclimber‎, 11-03-2010 01:45 AM
    • Replies: 0
    • Views: 2,091
    11-03-2010, 01:45 AM Go to last post
  55. How can I analyze data that is yes/no (I have it as 1/0)

    -Hi, I have a 2x2 factorial ANOVA design. It has several variables measured, but the only one I can't figure out is the one for specimen movement. ...

    Started by aesopclimber‎, 01-13-2011 01:50 AM
    • Replies: 11
    • Views: 22,784
    01-16-2011, 06:06 AM Go to last post
  56. Unhappy ANOVA and ANCOVA help please

    Hi, I am having problems with my ANCOVA. I have been asked to perform an ANCOVA on the data we have been given. Normally I'm okay with ANCOVAS.. but...

    Started by afairclo‎, 04-13-2009 11:40 PM
    • Replies: 0
    • Views: 1,954
    04-13-2009, 11:40 PM Go to last post
  57. reporting correlations, APA format.

    Hallo, I am trying to report my correlation statistics, but I can't remember if it is N-2 in the brackets or N-1. ie. r(n-?)= #, p < .05. I had a...

    Started by afairclo‎, 04-14-2009 09:19 PM
    • Replies: 0
    • Views: 6,008
    04-14-2009, 09:19 PM Go to last post
  58. ANCOVA post hocs?

    How do I do post hocs for ANCOVAs?

    Started by afairclo‎, 04-18-2009 01:09 AM
    • Replies: 2
    • Views: 4,223
    04-18-2009, 01:23 PM Go to last post
  59. naming w/ factor analysis

    Hallo, I am doing a factor analysis and have identified 2 factors but i don't know what to name them. The first 3 that correlate are french, german...

    Started by afairclo‎, 04-25-2009 03:33 AM
    • Replies: 1
    • Views: 2,411
    04-25-2009, 04:44 AM Go to last post
  60. Question Question about Hazard Ratio Interpretation

    Hi, all. I've done all the coding already for this, I just don't know how to interpret it. For an assignment, we were given this data taken from the...

    Started by afarrey11‎, 12-01-2013 11:57 PM
    cox regression, hazard ratios, sas
    • Replies: 2
    • Views: 2,460
    12-02-2013, 06:09 PM Go to last post

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