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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 197,168
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 66,955
09-30-2005, 09:44 AM
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...

• Replies: 4
• Views: 3,715
07-28-2011, 02:46 AM
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...

• Replies: 4
• Views: 20,095
08-31-2011, 08:07 AM
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...

• Replies: 4
• Views: 4,637
08-09-2011, 12:10 PM
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...

• Replies: 4
• Views: 7,782
05-18-2011, 10:07 AM
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...

• Replies: 4
• Views: 3,386
05-14-2011, 10:41 PM
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??

• Replies: 4
• Views: 9,546
05-18-2011, 01:31 PM
7. ### Normality Tests

• Replies: 4
• Views: 2,169
05-16-2011, 10:14 AM
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...

• Replies: 4
• Views: 2,726
05-17-2011, 01:04 AM
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...

• Replies: 4
• Views: 5,232
05-18-2011, 11:47 AM
10. ### 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...

• Replies: 4
• Views: 11,641
05-24-2011, 08:53 AM
11. ### 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...

• Replies: 4
• Views: 4,348
05-22-2011, 01:32 AM
12. ### 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.,...

• Replies: 4
• Views: 8,673
05-31-2011, 03:56 AM
13. ### 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...

• Replies: 4
• Views: 3,358
06-07-2011, 09:54 AM
14. ### 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...

• Replies: 4
• Views: 2,041
06-10-2011, 02:41 PM
15. ### 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,...

• Replies: 4
• Views: 24,539
06-11-2011, 02:57 PM
16. ### 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...

• Replies: 4
• Views: 2,445
axs
06-15-2011, 05:34 AM
17. ### 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...

• Replies: 4
• Views: 4,082
06-16-2011, 10:53 PM
18. ### 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...

• Replies: 4
• Views: 2,298
06-20-2011, 05:07 AM
19. ### 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...

• Replies: 4
• Views: 2,413
06-17-2011, 02:55 PM
20. ### 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...

• Replies: 4
• Views: 3,833
psy
07-08-2011, 06:03 AM
21. ### 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...

• Replies: 4
• Views: 3,011
06-26-2011, 02:16 PM
22. ### 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,...

• Replies: 4
• Views: 2,576
07-09-2011, 11:14 AM
23. ### 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...

• Replies: 4
• Views: 3,549
07-12-2011, 04:14 PM
24. ### Help With Stats Homework! Hypothesis Testing

NVM...I fund what I needed.

• Replies: 4
• Views: 2,298
07-15-2011, 09:02 PM
25. ### 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...

• Replies: 4
• Views: 2,043
07-19-2011, 05:35 PM
26. ### 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?

• Replies: 4
• Views: 3,051
07-23-2011, 03:25 AM
27. ### 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...

• Replies: 4
• Views: 3,338
07-25-2011, 09:50 AM
28. ### 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) . ...

• Replies: 4
• Views: 2,188
07-26-2011, 05:10 PM
29. ### 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...

• Replies: 4
• Views: 3,150
07-28-2011, 07:48 AM
30. ### "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...

• Replies: 4
• Views: 7,372
07-27-2011, 04:03 PM
31. ### 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.

• Replies: 4
• Views: 6,034
07-28-2011, 10:16 AM
32. ### inverse of cosine function

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

• Replies: 4
• Views: 3,172
07-31-2011, 01:10 PM
33. ### 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...

• Replies: 4
• Views: 2,192
08-04-2011, 10:46 AM
34. ### 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...

• Replies: 4
• Views: 2,675
08-04-2011, 03:44 PM
35. ### 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...

• Replies: 4
• Views: 14,476
08-05-2011, 01:17 PM
36. ### 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...

• Replies: 4
• Views: 2,008
08-08-2011, 12:02 AM
37. ### 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...

• Replies: 4
• Views: 2,322
08-09-2011, 08:58 AM
38. ### 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...

• Replies: 4
• Views: 2,157
08-16-2011, 11:42 AM
39. ### 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...

• Replies: 4
• Views: 14,685
08-17-2011, 01:26 PM
40. ### 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...

• Replies: 4
• Views: 2,868
08-24-2011, 09:13 AM
41. ### 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...

• Replies: 4
• Views: 3,401
08-30-2011, 05:36 AM

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...

• Replies: 4
• Views: 3,076
08-29-2011, 03:45 PM
43. ### 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...

• Replies: 4
• Views: 3,960
TS1
09-01-2011, 04:31 AM
44. ### Autocorrelation

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

• Replies: 4
• Views: 3,932
08-31-2011, 03:04 PM
45. ### 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...

• Replies: 4
• Views: 4,396
09-12-2011, 05:49 PM
46. ### 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 =...

• Replies: 4
• Views: 2,900
09-07-2011, 02:34 AM
47. ### 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...

• Replies: 4
• Views: 2,782
09-18-2011, 05:13 AM

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...

• Replies: 4
• Views: 2,325
09-07-2011, 07:10 PM
49. ### 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??...

• Replies: 4
• Views: 5,188
09-07-2011, 09:21 PM
50. ### 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...

• Replies: 4
• Views: 18,049
BGM
09-17-2011, 04:32 PM
51. ### 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...

• Replies: 4
• Views: 2,580
BGM
09-19-2011, 08:40 AM
52. ### 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...

• Replies: 4
• Views: 1,789
09-24-2011, 07:32 PM
53. ### 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...

• Replies: 4
• Views: 2,329
09-19-2011, 07:53 AM
54. ### 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...

• Replies: 4
• Views: 5,972
09-21-2011, 11:36 AM
55. ### 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...

• Replies: 4
• Views: 2,722
09-26-2011, 04:47 PM
56. ### 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%...

• Replies: 4
• Views: 1,905
09-25-2011, 01:27 PM
57. ### 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...

• Replies: 4
• Views: 1,612
09-26-2011, 11:36 AM
58. ### 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...

• Replies: 4
• Views: 8,814
BGM
10-04-2011, 10:26 AM

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