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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: 197,244
    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: 67,011
    09-30-2005, 09:44 AM Go to last post
  1. Non Parametric alternative to a Mixed Measures ANOVA

    Hi All, I am wondering if you can help me out with a problem i am having. Firstly, i have a single between subjects IV (gender) and then two...

    Started by silent_ice81‎, 12-29-2008 04:00 AM
    • Replies: 2
    • Views: 24,376
    12-31-2008, 02:09 AM Go to last post
  2. Unhappy What if ANOVA post-hoc isn't significant, but T-test is?

    The general question I have is, what do I do when a post-hoc difference comparison of 2 means form an ANOVA (that has a total of 4 groups) shows no...

    Started by hwc007‎, 06-10-2010 03:30 PM
    • Replies: 10
    • Views: 24,285
    06-10-2010, 05:42 PM Go to last post
  3. R-Square in Anova Analysis- How is it calculated?

    In Anova Analysis ( on SPSS or Excel Data Analysis Tool pack), we find R-Square, and Adjusted R-Square in the first table. How is calculated? What...

    Started by Dr.Appalayya‎, 06-02-2012 10:52 PM
    • Replies: 2
    • Views: 24,146
    06-02-2012, 11:08 PM Go to last post
  4. error in SPSS output

    Hello, I am using ANOVA to compare the variable means of 3 groups (N-52), but keep receiving a warning error in SPSS output - "Post Hoc tests are...

    Started by bobrose‎, 03-28-2012 11:06 AM
    • Replies: 7
    • Views: 24,108
    08-25-2017, 02:36 AM Go to last post
  5. How to Determine if 2 variables are dependent?

    I'm trying to figure out whether or not citation flow and trust flow are independent of each other (here is the article containing the data:...

    Started by janhen2‎, 07-23-2012 01:25 AM
    3 Pages
    1 2 3
    data, dependent, independant data, stat, statistics
    • Replies: 37
    • Views: 24,104
    07-31-2012, 05:46 PM Go to last post
  6. Regression: Standard Error of the mean interpretation?

    Im not sure how to interpret the Syx. I have a Syx of 4.1037. So far i can tell to say , the Syx is relatively small in relation to .... ...

    Started by el1‎, 05-28-2008 07:39 PM
    • Replies: 1
    • Views: 24,066
    05-29-2008, 10:41 AM Go to last post
  7. calculating population variance from sampling distribution variance

    Hi all, Let's say that I want to estimate the population mean and variance of a large bag of popcorn (unpopped). I have a scale, but it's not...

    Started by babucher‎, 10-20-2008 02:33 PM
    • Replies: 8
    • Views: 24,065
    05-23-2010, 02:45 PM Go to last post
  8. How do you read a Z-Score Table?

    Im trying to look up the right Z-value to construct a 95% confidence interval. I am using this table: ...

    Started by jjs2168‎, 04-08-2009 06:01 PM
    • Replies: 1
    • Views: 23,940
    04-08-2009, 11:49 PM Go to last post
  9. Help with Log Transformation

    Looking at my results, they do not fit the normal distribution curve. Therefore I was advised to do a 'log transformation' of the data. Is there...

    Started by naturalgut‎, 04-07-2008 07:36 AM
    • Replies: 14
    • Views: 23,939
    07-31-2014, 07:21 AM Go to last post
  10. Question correlate interval and ordinal variables?

    Hello, I currently fight with some statistical analysis for my thesis. I measured mean of heart-rate (continuous variable) during some timeframe...

    Started by sgraeber‎, 03-13-2009 11:45 AM
    • Replies: 3
    • Views: 23,930
    04-02-2012, 07:20 AM Go to last post
  11. Can chi-squared be used on count data with zero counts? If not, alternatives?

    Hello I'm looking for a non-parametric test that works on count data with a few zero counts. Example data set: Cow pat 1: 137 (no ....

    Started by gothicfruit‎, 12-06-2011 11:25 AM
    • Replies: 5
    • Views: 23,886
    12-06-2011, 12:10 PM Go to last post
  12. marginally significant p values

    Hello, I was wondering if someone could shed some light on what constitutes a marginally significant p-value? It doesn't seem to me that there are...

    Started by psychologygirl‎, 04-01-2009 03:31 PM
    • Replies: 2
    • Views: 23,854
    04-26-2014, 06:38 AM Go to last post
  13. Mann-Whitney vs Chi-Square

    What is the difference between a Mann-Whitney U test, and a Chi-square. E.g. for testing marital status as an independent variable to predict QOL...

    Started by JennJoy‎, 06-11-2008 12:20 PM
    • Replies: 1
    • Views: 23,839
    06-11-2008, 01:16 PM Go to last post
  14. [Solved] How to graph a partial correlation?

    Hi everyone, I would like to be able to make a graph for a partial correlation. Of course, to do so, I'll need the new X and Y values. I used SPSS...

    Started by yonder24‎, 08-08-2010 08:50 PM
    • Replies: 5
    • Views: 23,817
    01-09-2011, 03:48 PM Go to last post
  15. P=0.05

    Hello I have a question. I am doing a hypothesis testing, and I get a p value of exactly 0.05. Do I reject the null hypothesis or not, assuming a...

    Started by Yankel‎, 06-12-2013 10:07 AM
    • Replies: 5
    • Views: 23,701
    06-12-2013, 12:33 PM Go to last post
  16. Correlations between dichotomous and continuous variables

    Hello, I need to run a correlation in SPSS between two variables. One is a dichotomous variable (A). People have either answered the question...

    Started by barker‎, 11-07-2013 07:46 AM
    • Replies: 8
    • Views: 23,696
    11-07-2013, 11:11 AM Go to last post
  17. Date data type: Qualitative/quantitative?

    If it's quantitative, is it ratio or interval...? It seems a bit tricky to me because second is somehow quantitative but date is somehow ordinal...?

    Started by watashi‎, 10-09-2008 11:24 AM
    • Replies: 3
    • Views: 23,435
    10-11-2008, 03:46 PM Go to last post
  18. Covariance of Order Statistics from N(0,1) Distribution

    Hello, I am verifing an exact value of the 2nd moment E(R^2) of a sample range (R) from the standard normal distribution. To let you clearly know...

    Started by DHB10‎, 02-02-2012 10:33 PM
    5 Pages
    1 2 3 ... 5
    • Replies: 66
    • Views: 23,432
    02-24-2012, 09:56 AM Go to last post
  19. Squared Error vs Absolute Error loss functions

    The two most popular types of loss functions are 1) squared error: (actual-estimate)^2 --> best estimate is the mean 2) absolute error:...

    Started by shrek‎, 07-24-2008 02:29 PM
    • Replies: 2
    • Views: 23,340
    07-25-2008, 12:45 AM Go to last post
  20. How to determine how 'unusual' a value is within a sample

    I have a question about which sort of statistical analysis is required, and how to go about it, for the following situation. Basically, I've...

    Started by clcochrane‎, 08-15-2012 04:10 PM
    • Replies: 7
    • Views: 23,172
    08-23-2012, 01:42 PM Go to last post
  21. Exclamation Need Help Asap!! (z-scores)

    :eek: I am trying to figure out how to find the z-scores that separate the middle 88% of the data from the area in the tails of the standard normal...

    Started by heylee2005‎, 12-05-2005 11:04 PM
    • Replies: 2
    • Views: 23,048
    12-06-2005, 12:05 AM Go to last post
  22. Estimating the standard error of a ratio of means,(standard error of each mean known)

    Hi everyone, I'm stumped on a question based on dN/dS ratios in genetics. If I have two means, each with a standard error (same units), is there a...

    Started by oheigeas‎, 07-16-2010 09:42 AM
    • Replies: 2
    • Views: 22,992
    07-16-2010, 09:57 AM Go to last post
  23. Regression Analysis - what to do if population data is not normally distributed?

    Hi all I'd like to conduct a regression analysis using the entire population's data which I have at my disposal. However, the data of the...

    Started by student_T‎, 11-12-2006 08:11 AM
    • Replies: 4
    • Views: 22,932
    11-15-2006, 03:15 PM Go to last post
  24. 82% Confidence Interval

    Over the last 15 Major League Baseball seasons, the mean # of strikeouts by the American League leader is 258.5. Assuming that the # of strikeouts by...

    Started by ridley1013‎, 06-22-2008 03:18 PM
    • Replies: 2
    • Views: 22,825
    06-22-2008, 08:40 PM Go to last post
  25. 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: 22,812
    01-16-2011, 06:06 AM Go to last post
  26. Difference between a covariate and fixed factor

    Hi, in a linear mixed model, what is the difference between a covariate and a fixed factor ? The best explanation I've been able to find is: A...

    Started by thrillhouse86‎, 05-26-2010 09:10 AM
    • Replies: 3
    • Views: 22,745
    05-27-2010, 10:39 AM Go to last post
  27. p1=p2 test statistic question

    Hi I am now studying for my final which is tomorrow and i am doing some reviews how do i do this problem compute the test statistic used to...

    Started by chrischemma‎, 07-02-2009 01:38 AM
    • Replies: 4
    • Views: 22,627
    07-02-2009, 10:45 PM Go to last post
  28. Help! Correlation between Categorical Data & Interval data

    Hi, I am looking for some basic stats help and would appreciate any and all feedback! Thank you in advance! 1. I am trying to correlate...

    Started by Frenz5iron‎, 08-06-2009 11:32 AM
    • Replies: 7
    • Views: 22,586
    08-11-2009, 02:36 PM Go to last post
  29. Non parametric equivilent to ANCOVA

    Is there a non parametric test equivilent to an ANCOVA?

    Started by Savvy‎, 05-14-2008 01:48 AM
    • Replies: 5
    • Views: 22,549
    03-17-2015, 12:54 PM Go to last post
  30. which optimal bin width formula to choose for histogram

    For histogram construction, I learned from that for Gaussian distributed samples, 3.49*sigma*N^(-1/3) is optimal as the bin width. However, for...

    Started by stony‎, 12-12-2011 09:14 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 22,471
    12-15-2011, 07:04 PM Go to last post
  31. Show that s^2 is an unbiased estimator for sigma^2

    I am trying to complete a proof showing that s^2 = sum(Yi - Yi hat)^2/(n-2) is unbiased for sigma^2 In other words, show that E = sigma^2 I...

    Started by statgirl11‎, 10-06-2009 09:14 PM
    • Replies: 4
    • Views: 22,451
    10-06-2009, 11:22 PM Go to last post
  32. structural equation modeling (SEM), sample size

    I require structural equation modeling (SEM) for a project, and I need to calculate an estimated sample size. I am not a statisician, so I don't know...

    Started by JasonD‎, 01-27-2011 09:20 PM
    • Replies: 2
    • Views: 22,042
    02-04-2012, 01:52 PM Go to last post
  33. sample size calculation for a convenience sample

    hi, first, can you calculate sample sizes for a convenience (non-probability) sample or just for a probability sample? i work in a clinic. i...

    Started by randomrandom‎, 10-18-2011 06:38 PM
    • Replies: 3
    • Views: 22,033
    10-19-2011, 12:35 PM Go to last post
  34. how to calculate prevalance of obesity in spss using bmi values

    i am a newbie and i dont know how to calculate prevalance of obesity in spss using bmi values

    Started by arkabbot‎, 09-05-2012 12:09 PM
    2 Pages
    1 2
    prevalance, spss
    • Replies: 16
    • Views: 21,920
    09-09-2012, 11:35 AM Go to last post
  35. Kuder-Richardson Reliability Coefficients (KR20) in SPSS?

    Dear all, I am checking how to do a Kuder-Richardson Reliability Coefficients (KR20) in SPSS. I want to use the KR20 to learn about the internal...

    Started by collegeblock‎, 05-25-2012 04:35 AM
    • Replies: 1
    • Views: 21,860
    05-25-2012, 04:39 AM Go to last post
  36. 2 sided exact significance in fisher's exact test

    i compared the frequency of cardioembolism between age-group <45years and 46-50 years using SPSS using cross-tab. As you can see the result in the...

    Started by hikehub‎, 09-29-2012 12:57 AM
    • Replies: 1
    • Views: 21,859
    09-29-2012, 06:09 AM Go to last post
  37. Transform data to use ANOVA?

    Hey, I have a set of non-normal data that I need to run an ANOVA on. Do you think I would get away with transforming the data to do it, since one...

    Started by statn00b‎, 11-23-2011 11:42 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 21,828
    11-23-2011, 05:48 PM Go to last post
  38. Indicated probability or percentage of sampling error

    I have tried this problem for three days, and I cannot find the example of how to do this in my book, or online anywhere. Scores on an apptitude...

    Started by tdurepo‎, 11-26-2005 02:41 PM
    • Replies: 3
    • Views: 21,707
    11-28-2005, 09:27 AM Go to last post
  39. when "normalizing" values, do i need to re-calculate SEM

    hello, i apologize for the simple question, but i have no experience with stats. i have a data set that i am trying to analyze. i have calculated...

    Started by medstudent1‎, 09-18-2008 11:58 AM
    • Replies: 6
    • Views: 21,616
    09-21-2008, 12:24 PM Go to last post
  40. Question Interpretting Levene's test (Stata)

    I looked this up quite a bit, and found alot about it, but I'm still not entirely sure if I got it right. I just recently got an assignment back with...

    Started by Lukan27‎, 05-03-2012 03:00 PM
    confidence, interpret, levene, test
    • Replies: 5
    • Views: 21,604
    09-13-2013, 08:24 AM Go to last post
  41. Post [Sponsored]Statistical estimations with Finaquant Protos – free .net library with tab

    Hello all, We would like to introduce our non-commercial software for students and academic staff: finaquant® protos - free .net library with...

    Started by quark‎, 02-26-2013 01:38 AM
    • Replies: 0
    • Views: 21,540
    02-26-2013, 01:38 AM Go to last post
  42. A question on means, adding and taking scores and standard deviation.

    need a bit of help on my statistics homework. I've taken the class twice and no matter how much I study I seem to only be able to achieve a D. So...

    Started by Deganveran‎, 02-06-2010 09:47 PM
    • Replies: 3
    • Views: 21,499
    02-08-2010, 01:41 PM Go to last post
  43. How to convert ordinal into interval?

    Hi all, i'm a new member here.. I have a problem, right now i'm on my undergraduate thesis, my thesis is about the relation between internal audit...

    Started by smartmushu‎, 08-16-2006 04:29 AM
    • Replies: 4
    • Views: 21,415
    08-18-2006, 02:35 PM Go to last post
  44. Correlation (data need to be normall distributed?)

    Hi, today, I read through the chapter 'correlation' and there it is stated: the condition to apply either regression or correlation is that...

    Started by beginner‎, 11-14-2009 12:35 PM
    • Replies: 7
    • Views: 21,337
    11-22-2009, 07:12 PM Go to last post
  45. 2 way ANOVA posthoc VS pairwise comparisons

    I am doing some research that I am analysing with a 2 way ANOVA, using SPSS version 17 software. The design of my analysis is: 2 between subject...

    Started by psych_phd‎, 02-09-2010 09:35 AM
    • Replies: 6
    • Views: 21,259
    04-19-2011, 09:05 PM Go to last post
  46. how to prove E(Σei^)=ΣE(yi^)-E(Σyihat^)

    this formula looks simple but i really don't know how to explain mathmatically E(Σei^)=ΣE(yi^)-E i tried putting E(Σei^)=E but then don;t know how...

    Started by azuresky‎, 01-26-2007 12:52 AM
    • Replies: 1
    • Views: 21,070
    01-27-2007, 02:17 AM Go to last post
  47. Regression: squaring variables in models

    Ok I'm pretty sure someone will have a simple answer to this but I don't entirely understand it. Using a large dataset (2000+ cases) of...

    Started by Fingbut‎, 09-05-2008 03:50 PM
    • Replies: 3
    • Views: 21,057
    09-05-2008, 05:08 PM Go to last post
  48. What does P(z>1.65) translate to probability

    Form the z table for standard normal curve, I am trying to find out the probability of z>1.65. According to z table, z score of 1.65 is 0.4505 ...

    Started by ocean1‎, 03-17-2011 11:01 PM
    • Replies: 7
    • Views: 20,989
    03-27-2011, 01:01 AM Go to last post
  49. How to make a confidence interval

    Hi. I'm interested in understanding the process of making (constructing?) a confidence interval for a normal distribution. Using a problem I...

    Started by everlost‎, 01-11-2011 05:43 PM
    ci for normal data
    • Replies: 2
    • Views: 20,984
    01-11-2011, 06:52 PM Go to last post
  50. ANCOVA test of homogeneity of regression slopes

    Hi, I recently learned how to conduct ANCOVAs in SPSS and know that one of the assumptions that needs to be tested is the assumption of homogeneity...

    Started by tkut‎, 05-04-2009 11:51 AM
    • Replies: 2
    • Views: 20,960
    05-05-2009, 01:48 PM Go to last post
  51. Likert Scale Computation

    Hello, i have a likert scale questionnaire where respondents will ranked questions 1(Strongly Agree)-6(Disagree). the research is about comparing...

    Started by sndz‎, 02-22-2012 08:35 AM
    computation, likert, scale
    • Replies: 4
    • Views: 20,887
    02-23-2012, 07:06 PM Go to last post
  52. Interpret Chi-Square Goodness-of-Fit Test?

    Hi and thank you for reading this post, I ran a factor analysis on a scale and its data, and it came with a "Chi-Square goodness-of-fit" output...

    Started by statn00b‎, 11-18-2011 01:08 PM
    • Replies: 13
    • Views: 20,802
    11-18-2011, 03:45 PM Go to last post
  53. What does the rho symbol mean for this statistics problem?

    A part of a question on my homework is: X1, X2 are independent, uniform random variables. Calculate ρ_(x1+x2, x1-2x2). I don't know what I am...

    Started by saaam‎, 04-18-2011 04:41 PM
    • Replies: 5
    • Views: 20,712
    04-19-2011, 01:10 PM Go to last post
  54. [SOLVED] Expected Value of Order Statistics from Standard Normal Distribution

    Question: Find the expected value of the largest order statistic in a random sample of size 4 from the standard normal distribution. Remarks: I...

    Started by DHB10‎, 01-21-2012 03:39 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 20,649
    02-01-2012, 06:03 AM Go to last post
  55. T-value meaning?

    I have done a paired t-test in the minitab and got the t-value = -4.78 and p-value = 0.001 My Null Hypothesis: The drug is not effective therefore...

    Started by vanklik‎, 12-07-2011 03:45 PM
    • Replies: 3
    • Views: 20,626
    12-07-2011, 08:18 PM Go to last post
  56. Unhappy Variance and sample size of the sampling distribution of the mean

    Hello all, Im a postgraduate student doing a statistics assignment. I have been working through it steadily until I came across this question and...

    Started by LiquidMoon‎, 11-15-2010 05:36 PM
    • Replies: 2
    • Views: 20,359
    11-16-2010, 01:32 PM Go to last post
  57. Basic t score question

    Is it ok to have a t-score that is negative? If it is negative, when looking at the t score table do I look at the number as a positive? Thanks

    Started by playbrunson‎, 12-18-2008 08:04 PM
    • Replies: 2
    • Views: 20,313
    12-18-2008, 10:05 PM Go to last post
  58. Can age be treated as normally distributed?

    My thinking is that if you had an entire data set of everyone in the USA and viewed a histogram of their ages with a normal curve, it would appear...

    Started by rtyrtyrtyus‎, 05-07-2010 12:31 PM
    • Replies: 4
    • Views: 20,290
    05-08-2010, 12:30 AM Go to last post
  59. help with SPSS output and repeated measures ANCOVA and MANCOVA

    Hi, I was wondering if someone could recommend a good text on how to interpret SPSS output for repeated measures ANCOVA and MANCOVA (or maybe someone...

    Started by psychologygirl‎, 03-17-2009 09:31 AM
    • Replies: 2
    • Views: 20,249
    02-14-2011, 07:06 PM Go to last post
  60. difference between sigma and standard deviation

    please, what is the difference between sigma and standard deviation in quality control

    Started by sihem‎, 10-24-2011 12:24 PM
    • Replies: 1
    • Views: 20,192
    10-24-2011, 01:32 PM Go to last post

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