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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: 197,168
    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: 66,955
    09-30-2005, 09:44 AM Go to last post
  1. Circular statistics

    Has anyone seen a good comprehensive book on Circular statistics? I'm interested using some of the techniques in my work however the one at our...

    Started by TheEcologist‎, 05-22-2008 02:20 PM
    • Replies: 4
    • Views: 3,715
    07-28-2011, 02:46 AM Go to last post
  2. Non parametric alternatives to MANOVA

    I need to perform a MANOVA onto non parametric data in a repeated measures design. The "Median test" is not the one, so.. anybody can help ? I...

    Started by ryochan‎, 03-16-2010 04:57 PM
    • Replies: 4
    • Views: 20,095
    08-31-2011, 08:07 AM Go to last post
  3. Problem with Mann-Whitney test

    Hi, I have a problem with Mann-Whitney test. When I tried to run my data in SPSS, the result for Mann-Whitney U=0.00, p<0.01. Is it ok to have U=0...

    Started by puzzlecode‎, 08-09-2011 10:26 AM
    • Replies: 4
    • Views: 4,637
    08-09-2011, 12:10 PM Go to last post
  4. Categorical Variables - Dummy Coding?

    Hi - I have a question pertaining to a categorical predictor variable with 3 levels (high, medium, low), a continuous predictor variable on a 7-pt...

    Started by CogPsych01‎, 04-15-2011 01:38 AM
    • Replies: 4
    • Views: 7,782
    05-18-2011, 10:07 AM Go to last post
  5. How to deal lab values as "<0.3" or ">100" in statistical analysis

    Dear all, I am new to this forum and I hope that someone here may help! I have to analyse the results of lab values (concentrations of...

    Started by med1234‎, 05-14-2011 10:56 AM
    • Replies: 4
    • Views: 3,386
    05-14-2011, 10:41 PM Go to last post
  6. Expected Value of AB

    Let A=f(x)=(3/8)x^2 where 0<=x<=2 B=g(x)=(1/4)x^3 where 0<=x<=2 I need to find Cov(A,B), I know Cov(A,B) = E-EE, but how to calculate E??

    Started by howfly24‎, 05-15-2011 04:24 AM
    • Replies: 4
    • Views: 9,546
    05-18-2011, 01:31 PM Go to last post
  7. Normality Tests

    I'm trying to follow the below link to test the effectiveness of two ads....

    Started by amathew‎, 05-15-2011 09:56 PM
    • Replies: 4
    • Views: 2,169
    05-16-2011, 10:14 AM Go to last post
  8. The best way to choose weights for parameters that contribute in scoring items

    Hello every one, I am new to stats world. so I need your help plz. I am working on a project that is based on computing a score for a group of...

    Started by Dima Shawahneh‎, 05-16-2011 08:03 AM
    • Replies: 4
    • Views: 2,726
    05-17-2011, 01:04 AM Go to last post
  9. balanced and unbalanced design

    Please kindly help me, my project topic is "A COMPARATIVE STUDY ON BALANCED AND UNBALANCED DESIGN IN EXPERIMENTAL DESIGN" i will really appreciate...

    Started by ibnquasale‎, 05-18-2011 11:14 AM
    • Replies: 4
    • Views: 5,232
    05-18-2011, 11:47 AM Go to last post
  10. Comparing standard deviations of different means

    Hey y'all, I'm a total rookie when it comes to statistics, so please forgive my ignorance/laymen's terms. I want to know when CONSISTENCY is more...

    Started by cpaavola‎, 05-20-2011 06:24 PM
    • Replies: 4
    • Views: 31,538
    05-23-2011, 11:53 AM Go to last post
  11. MANOVA: Can dependent variables correlate each other?

    Hi, I have 2 groups of animals. An animal was tested in a cage. The cage was divided into 4 different locations. I scored the duration the animal...

    Started by Yoshi‎, 05-20-2011 04:54 AM
    • Replies: 4
    • Views: 11,641
    05-24-2011, 08:53 AM Go to last post
  12. What can be concluded from different medians?

    Hi everybody I have two samples describing average wages: one before and one after the treatment. The medians of these two treatments differ. Can...

    Started by Mr. Dazel‎, 05-21-2011 11:25 PM
    median
    • Replies: 4
    • Views: 4,348
    05-22-2011, 01:32 AM Go to last post
  13. Confidence intervals for continuous vs. dichotomous variables: what's the difference?

    Hello, I am performing an analysis and have a variable that is dichotomous (i.e., "0" or "1"). I have another variable that is continuous (i.e.,...

    Started by Wayfarer_Mike‎, 05-30-2011 01:36 PM
    • Replies: 4
    • Views: 8,673
    05-31-2011, 03:56 AM Go to last post
  14. Partial Correlation - Help for a beginner

    Firstly, please forgive me if my question is either badly worded, or just plain wrong. I am concerned I fall into the category that proves a little...

    Started by chrishb59‎, 05-30-2011 09:07 AM
    • Replies: 4
    • Views: 3,693
    06-06-2011, 12:11 PM Go to last post
  15. Is the t test the right one for me?

    Hi guys, I have run a t test for a dissertation i am writing but i am a statistical noob. I needed to compare 66 pressures on one devive against...

    Started by Ninjjaa‎, 06-07-2011 02:07 AM
    • Replies: 4
    • Views: 3,358
    06-07-2011, 09:54 AM Go to last post
  16. Errors and Standard Deviation

    Hello dear all! What type of error can be calculated if I have two replicates of each sample I measure? To calculate the standard deviation we...

    Started by AlinaM‎, 06-07-2011 12:08 PM
    • Replies: 4
    • Views: 2,041
    06-10-2011, 02:41 PM Go to last post
  17. Assigning weights to variables

    Hi all, I'm not a statistician, but just trying to get help on an analysis I'm running, so I apologize ahead of time if this question is basic,...

    Started by jjcinnj‎, 06-11-2011 12:49 PM
    • Replies: 4
    • Views: 24,539
    06-11-2011, 02:57 PM Go to last post
  18. Estimate number of urns based on drawn balls

    Assume there is a number of labeled urns and every urn holds a number of balls (at least one). You know there are n balls in total but you do not...

    Started by axs‎, 06-14-2011 08:38 AM
    • Replies: 4
    • Views: 2,445
    06-15-2011, 05:34 AM Go to last post
  19. Doing exploratory analyses and SEM with same data set

    I have a colleague who wants me to look over survey data and perform exploratory regressions on variables to see if there are any effects. In the...

    Started by krytellan‎, 06-15-2011 12:08 PM
    • Replies: 4
    • Views: 4,082
    06-16-2011, 10:53 PM Go to last post
  20. What stats techniques to use?

    Hi, I have multiple sets of data that I'm comparing against leadership style preferences (numerical 1-10 per style). I've conducted a basic...

    Started by james1010‎, 06-16-2011 11:04 AM
    • Replies: 4
    • Views: 2,298
    06-20-2011, 05:07 AM Go to last post
  21. regression to the mean

    We have done a survy evaluating quality of vision following cataract surgery. We used an instrument previously validated by the NIH on normal people...

    Started by bgaynes‎, 06-16-2011 01:14 PM
    • Replies: 4
    • Views: 2,413
    06-17-2011, 02:55 PM Go to last post
  22. effect size

    hi I have a problem with calculating effect size for my data. my design is single subject and when I calculate effect size for comparing baseline...

    Started by psy‎, 06-21-2011 04:55 PM
    • Replies: 4
    • Views: 3,833
    07-08-2011, 06:03 AM Go to last post
  23. Need some Help

    I am preparing for my final exam but I am having some serious troule with significance levels. I was hoping someone could help me out. The...

    Started by Okohme‎, 06-25-2011 09:05 PM
    • Replies: 4
    • Views: 3,011
    06-26-2011, 02:16 PM Go to last post
  24. A single value that summarises trust in sample mean

    Suppose I have a number N of independent ratings of a given item, where each rating is an integer between 1 and 7 (inclusive). For simplicity sake,...

    Started by jon_smark‎, 07-08-2011 06:09 PM
    • Replies: 4
    • Views: 2,576
    07-09-2011, 11:14 AM Go to last post
  25. Question Computing how abnormal a data point is in a non-normal distribution

    Hi, folks. This is my first foray into posting on this forum, so apologies if there is a protocol I am unaware of. Let's say I have a binomial...

    Started by Brian Magerko‎, 07-12-2011 02:36 PM
    outliers
    • Replies: 4
    • Views: 3,549
    07-12-2011, 04:14 PM Go to last post
  26. Help With Stats Homework! Hypothesis Testing

    NVM...I fund what I needed.

    Started by Jazzgear‎, 07-15-2011 08:40 PM
    • Replies: 4
    • Views: 2,298
    07-15-2011, 09:02 PM Go to last post
  27. Splitting a sample

    Ok, so please forgive me in advance, I'm not a stats expert, but I do sampling as part of my function as an auditor. I'm trying to develop a new and...

    Started by mrog71‎, 07-19-2011 04:33 PM
    • Replies: 4
    • Views: 2,043
    07-19-2011, 05:35 PM Go to last post
  28. Distribution of coefficients in regression

    When I get the regression equation y = a.x + b by regressing y on x, how do I find and plot the distribution of a?

    Started by sak‎, 07-22-2011 08:29 AM
    distribution of coeff
    • Replies: 4
    • Views: 3,051
    07-23-2011, 03:25 AM Go to last post
  29. What is variance supposed to represent?

    I've been trying to get my head around variances today. I know the fomulas (for sample and population variances), but I'd like to understand what...

    Started by DaveA‎, 07-24-2011 08:29 PM
    • Replies: 4
    • Views: 3,338
    07-25-2011, 09:50 AM Go to last post
  30. Help deciding statistical test

    Hi! I am going to test 10 persons taking a specific diet for 4 weeks (Going to test before starting on the diet and after they are finished) . ...

    Started by freddi‎, 07-26-2011 07:10 AM
    • Replies: 4
    • Views: 2,188
    07-26-2011, 05:10 PM Go to last post
  31. Help in calculating mean of non- Likert Scale

    Hi everyone. I need to know how the means are calculated in this table specifically how to calculate a mean when we have a yes/no question (not...

    Started by hsaharmo‎, 07-27-2011 05:36 AM
    • Replies: 4
    • Views: 3,150
    07-28-2011, 07:48 AM Go to last post
  32. "independent of" vs "mutually exclusive"

    Hi, I am a stats newbie. Sorry about asking this trivial question. Say I have a 2 x2 contingency table. The categories defining rows and...

    Started by kevinoisac‎, 07-27-2011 10:36 AM
    • Replies: 4
    • Views: 7,372
    07-27-2011, 04:03 PM Go to last post
  33. Test for difference in correlation coefficients

    Hi Does anyone know how I can test for the difference in two correlation coefficients? Any help would be much appreciated.

    Started by Bill77‎, 07-27-2011 06:36 PM
    • Replies: 4
    • Views: 6,034
    07-28-2011, 10:16 AM Go to last post
  34. inverse of cosine function

    Hello everyone how can I use the inverse of a cosine in R? any help will be highly appreciated.

    Started by nana‎, 07-30-2011 06:01 PM
    • Replies: 4
    • Views: 3,172
    07-31-2011, 01:10 PM Go to last post
  35. Z Scores

    Hi All, I am new to the forum and it would help me immensely if someone could help me... I am a sports coach and have to present testing data...

    Started by kier82‎, 08-04-2011 10:01 AM
    • Replies: 4
    • Views: 2,192
    08-04-2011, 10:46 AM Go to last post
  36. Question Point Estimates and Confidence Intervals

    Hello, I am a student enrolled in an elementary statistics class. I am having trouble understanding the concept of the point estimate when...

    Started by jwmccalmon‎, 08-04-2011 10:53 AM
    • Replies: 4
    • Views: 2,675
    08-04-2011, 03:44 PM Go to last post
  37. Test of hypothesis at 2% level of significance

    I would like to help answer this question: a mathematic journal recently reported the mean IQ of all statistics professors is at least 120. to test...

    Started by lulu88‎, 08-05-2011 09:01 AM
    • Replies: 4
    • Views: 14,476
    08-05-2011, 01:17 PM Go to last post
  38. Normal Distribution???

    When I work this problem out I end up with -1.25; then the table gives me .1056 but the answer is .3944, how do they get .3944? Normally...

    Started by Trying4MBA‎, 08-07-2011 06:45 PM
    • Replies: 4
    • Views: 2,008
    08-08-2011, 12:02 AM Go to last post
  39. Identify statistical method: pair-wise analysis of descriptiors from Economist.com

    Greetings, In an article on the Economist.com a writer describes a stastical method for reducing a large number of quantifiable "descriptors" down...

    Started by John Reed‎, 08-07-2011 11:11 PM
    • Replies: 4
    • Views: 2,322
    08-09-2011, 08:58 AM Go to last post
  40. estimation problem stucked

    X1, X2, .... ,Xn are independet exponential random variables with E(Xk)=k times lambda where k = 1,2,...,n. What is the sufficient statistics and...

    Started by phinejose5‎, 08-16-2011 03:28 AM
    • Replies: 4
    • Views: 2,157
    08-16-2011, 11:42 AM Go to last post
  41. Post-hoc MANCOVA Tests in SPSS

    Hi, SPSS won't allow me to run post-hoc tests on a MANOVA with covariates - how can I now interpret results following a significant Wilk's Lambda...

    Started by garou22‎, 08-16-2011 08:09 AM
    • Replies: 4
    • Views: 14,685
    08-17-2011, 01:26 PM Go to last post
  42. Power question

    I know generally what power is and I have determined for my analysis (via Gpower) that my power is .25 (yeah I know that is really low....). My...

    Started by noetsi‎, 08-23-2011 07:53 PM
    • Replies: 4
    • Views: 2,868
    08-24-2011, 09:13 AM Go to last post
  43. Mann Whitney U test- Sample size Difference

    Hello everybody :wave: I have two very basic problems. I'm performing Mann Whitney U test on two set of data drawn from a larger population. My...

    Started by dhriti‎, 08-28-2011 11:08 PM
    • Replies: 4
    • Views: 3,401
    08-30-2011, 05:36 AM Go to last post
  44. simple one for beginner - Mean VS Correlation please help!

    let's say i want to calculate the Mean of the frequency of studens's use of facebook (1=low, 5=high) , and i find that: the Mean of students with...

    Started by ymds‎, 08-29-2011 03:07 PM
    • Replies: 4
    • Views: 3,076
    08-29-2011, 03:45 PM Go to last post
  45. comparing categorical data within the same group

    Help! This may be basic but I am trying to compare the responses to a (yes/no) question given to a group of people before and after an event. The...

    Started by TS1‎, 08-31-2011 12:22 PM
    • Replies: 4
    • Views: 3,960
    09-01-2011, 04:31 AM Go to last post
  46. Autocorrelation

    When error terms are autocorrelated a. their means are necessarily different than zero. b. estimated coefficients are biased c. estimated...

    Started by aycanada‎, 08-31-2011 02:28 PM
    • Replies: 4
    • Views: 3,932
    08-31-2011, 03:04 PM Go to last post
  47. Help with power analysis!

    So, I've never taken a statistics course before. Just completed my honors thesis and graduated. Now I'm trying to do power analysis (post hoc) on my...

    Started by redskins‎, 09-12-2011 01:09 PM
    effect size, power analysis, sample size
    • Replies: 4
    • Views: 4,396
    09-12-2011, 05:49 PM Go to last post
  48. Help with Bayes Theorem

    I am having trouble setting this up: Probability of people who speed and crash = .821 Probability of people who don't speed and still crash crash =...

    Started by phalse‎, 09-06-2011 03:43 PM
    • Replies: 4
    • Views: 2,900
    09-07-2011, 02:34 AM Go to last post
  49. Chi Square

    Hi In every book on chi^2 I read, the author mentions that the chi^2-distribution becomes Gaussian for large degrees of freedom. Is this...

    Started by Niles‎, 09-15-2011 04:25 AM
    • Replies: 4
    • Views: 2,782
    09-18-2011, 05:13 AM Go to last post
  50. Homework Help Please?!

    I am having trouble with this question..or with stat in general! Can you help me? Question: The life of a light bulb follows a normal distribution...

    Started by jhutchings‎, 09-07-2011 10:28 AM
    • Replies: 4
    • Views: 2,325
    09-07-2011, 07:10 PM Go to last post
  51. R2 in mixed models (MIXED)

    Hi all, I need calculate R2 in mixed model, i can do it in GLM but i can not found the option in this kind of model, do you know if its posible??...

    Started by Rodrigo Badilla Cabrera‎, 09-07-2011 05:33 PM
    • Replies: 4
    • Views: 5,188
    09-07-2011, 09:21 PM Go to last post
  52. How to apply Continuity Correction Factor to stat test

    Regarding Hypothesis Test for Difference Between Proportions: http://stattrek.com/ap-statistics-4/test-difference-proportion.aspx Is it ever...

    Started by egret‎, 09-16-2011 09:42 AM
    • Replies: 4
    • Views: 18,049
    09-17-2011, 04:32 PM Go to last post
  53. Help Me Understand Conflicting Formulas for Standard Deviation

    Hello, I just took a statistics quiz. I did fine. However, something is bothering me: the instructor handed out a cheat-sheet with statistics...

    Started by T.C.‎, 09-16-2011 08:46 PM
    • Replies: 4
    • Views: 2,580
    09-19-2011, 08:40 AM Go to last post
  54. Scatter Plot data help

    Hello, I have a data set- 30 questions that are positive attitude/ 30 that are negative attitude AND I have two groups of individuals tested - One...

    Started by watasnake‎, 09-22-2011 02:43 PM
    • Replies: 4
    • Views: 1,789
    09-24-2011, 07:32 PM Go to last post
  55. Days Off Work

    Hi I was wondering if you could help with an statistical calc I am embarking on. I have someone in my group who has taken 8 days off ill in 18...

    Started by Chadwick‎, 09-18-2011 10:10 PM
    • Replies: 4
    • Views: 2,329
    09-19-2011, 07:53 AM Go to last post
  56. 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: 5,972
    09-21-2011, 11:36 AM Go to last post
  57. Find the value of b with a Chi-Square distribution

    Hi! I am doing Chi-Square distribution and I have the following question, how do I solve for b? How do I find the value of b? D.f. = 4 and...

    Started by ksan1936‎, 09-24-2011 07:27 PM
    • Replies: 4
    • Views: 2,722
    09-26-2011, 04:47 PM Go to last post
  58. Help regarding standard deviation

    A consolidated sales (67,200) & the corresponding standard deviation (20,160) is given. The sales is distributed across two regions A & B - A(65%...

    Started by vishal.khatri09‎, 09-25-2011 10:35 AM
    • Replies: 4
    • Views: 1,905
    09-25-2011, 01:27 PM Go to last post
  59. Simple Regressions Help Needed!

    I'm having trouble figuring out how to use this data into a program or by doing it by hand. (3) Extra Credit: If you know how to estimate simple...

    Started by sosteezy‎, 09-25-2011 04:12 PM
    • Replies: 4
    • Views: 1,612
    09-26-2011, 11:36 AM Go to last post
  60. Extremely urgent - Pls help- how to calculate the p value

    I have to calculate a p value, but I am completely ignorant.... Pls help me My data: mean 18 deviation 6 min 12 max 27 sample size 4 I...

    Started by ROURIKA‎, 10-04-2011 06:08 AM
    • Replies: 4
    • Views: 8,814
    10-04-2011, 10:26 AM Go to last post

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