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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: 197,032
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: 66,893
09-30-2005, 09:44 AM
1. ### Transforming data (normal distribution)

If I transform one variable to compensate for skewness/kurtosis, do I have to apply this transformation to all of the other data (i.e. the other...

• Replies: 4
• Views: 8,878
04-18-2009, 04:23 AM
2. ### bimodal distribution

Dear all, My data (expressed in Voice Onset Time, in ms) show a clear bimodal distribution. I've been looking for an answer to the following...

• Replies: 4
• Views: 8,866
05-20-2008, 05:07 AM
3. ### Minimum Variance Hedge Ratio

Hello, Let me provide a quick background of myself. I'm 25, was a math major in college and traded mortgages for the last 3-4 years. I took one...

• Replies: 2
• Views: 8,866
12-26-2010, 12:39 PM
4. ### hypothesis testing by mean levels

hi everyone... i have this homework.. i tried to solve it... can anyone check if it's right or not, please?? Question: The maximum acceptable...

• Replies: 1
• Views: 8,863
11-11-2010, 03:42 AM
5. ### Violation of Homogeneity of variance (MANOVA)

Hi I was planning to do a MANOVA on a data set I have but have just discovered the data violates assumptions of homogeneity. I was advised to...

• Replies: 2
• Views: 8,862
ssi
07-28-2010, 07:48 AM
6. ### Combining Uniform Distributions

Say I have two variables, X and Y, that both have uniformly distributed probability density functions. I also have a variable Z that is always equal...

• Replies: 5
• Views: 8,862
BGM
10-23-2010, 03:33 PM
7. ### Cohen's d for one-sample/paired-samples vs. independent samples, and pooled SDs

I have a few questions for you all about Cohen's d and pooled SDs! This is my first post, hope it goes in line with forum guidelines. 1)...

• Replies: 0
• Views: 8,862
06-07-2012, 12:46 PM
8. ### Method of Distribution Functions

Hi, I have a question about the method of distribution functions, which is used to derive the density function of some function of a continuous...

• Replies: 2
• Views: 8,855
06-25-2010, 06:32 PM
9. ### Does it make sense to calculate a standard deviation from only three values?

I have sets of three values. Does the standard deviation make sense from only three values? Is there a minimum number of values that is recommended...

• Replies: 5
• Views: 8,845
04-28-2006, 07:36 AM
10. ### Sample size for ordinal logistic regression (or at least ordinal)

I am trying to determine the sample size I need for my dissertation and I have no clue where to begin. I have been unable to find a sample size...

• Replies: 1
• Views: 8,839
02-01-2014, 06:00 PM
11. ### Westinghouse Rules

What are Westinghouse rules?

• Replies: 0
• Views: 8,834
04-16-2009, 08:47 AM
12. ### kurtosis skewness and Jarque Bera interpretation

I am getting a value of 27.202 of kurtosis, Jarque bera of 861.4684 with probability 0.000000 and skewness of 5.078,,,,,,,,,, what to interpret are...

• Replies: 2
• Views: 8,813
12-06-2011, 08:58 AM
13. ### log transformation of binary variables

Hi everyone, I am trying to do a factor analysis of a group of drinking behavior variables, and some of them are highly positively skewed. I want...

• Replies: 7
• Views: 8,808
08-25-2011, 02:39 PM
14. ### Likert scale - Tiny sample size - What test to use?

Dear Forum members I am in the progressing of analyzing data from an online Likert scale questionnaire investigating cancer patients experience of...

• Replies: 3
• Views: 8,807
04-02-2012, 06:12 PM
15. ### Type I and II, HO and H1

I am committing to memory the definitions of the Type I and II error rates, but my brain is having difficulty when looking at a null and alternative...

• Replies: 2
• Views: 8,805
09-10-2006, 08:57 AM
16. ### it's me again, need some help, thanks

:D Ok. I think I have it, but my answer does not quite match up. ??? A RECENT POLL OF 700 PPL. WHO WORK INDOORS FOUND THAT 278 OF THEM SMOKE....

• Replies: 1
• Views: 8,797
11-01-2005, 09:56 PM
17. ### Kolmogorov-Smirnov Z - how to calculate effect size??

Hi there, A similar question to Laura's- how do I calculate effect sizes for the Kolmogorov-Smirnov Z? Is the Z value given by SPSS what I need,...

• Replies: 0
• Views: 8,793
12-19-2006, 07:32 AM
18. ### Scheffe Test

Hi all-- Quick question: Can anyone please give me a VERY elementary definition of a Scheffe post hoc test? Any help will be greatly...

• Replies: 5
• Views: 8,776
06-04-2011, 03:34 PM
19. ### Panel data with entity and time fixed effects

I wanna regress Y on ENTITY FIXED VARIABLE(say, like alpha i), TIME FIXED VARIABLE(say, theta t), AND three more aggressors Xi, i=1,2,3. Now I...

• Replies: 0
• Views: 8,775
12-06-2008, 01:11 AM
20. ### 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: 8,775
BGM
10-04-2011, 10:26 AM
21. ### Which statistical test suits my questionnaire?

My research involves constraining the English language to a lexicon of fewer words (e.g. by ensuring one-word one-meaning and removing redundant...

• Replies: 2
• Views: 8,762
01-10-2008, 11:00 AM
22. ### Standard Deviation with values of zero in population

Hey, let's say I want to find the standard deviation for a small population, and a lot of the results = zero, is there a way to compensate? For...

• Replies: 10
• Views: 8,759
05-30-2011, 11:23 PM
23. ### Time demeaned v. LSDV fixed effects regression

I'd like to figure out which method is better for doing a fixed effects regression: a time demeaned regression (like Stata's xtreg function) or what...

• Replies: 0
• Views: 8,757
11-03-2007, 08:28 AM
24. ### How many data rows can SPSS handle?

In a few weeks an internet survey will hopefully start that should get a response rate of somewhere between 2 and 6 thousand people. I'm assuming the...

• Replies: 2
• Views: 8,740
05-18-2013, 04:06 PM
25. ### Transforming a Process into a Markov chain

Can someone please help me understand how this is done: wheter or not it rains today depends on previous weather conditions through the last two...

• Replies: 2
• Views: 8,732
01-26-2011, 11:33 AM
26. ### Significance of Simple Slopes in a 2-way interaction

I have used simple slopes to test a two-way interaction in a regression model. However, I get 1-tailed and 2-tailes significance results. It is my...

• Replies: 7
• Views: 8,724
03-11-2011, 02:35 AM
27. ### Choosing a null hypothesis in general

I've read for the better part of two to three hours about the null hypothesis. I've run hypothesis tests, DOE analysis, ANOVAs, and the like, and I...

• Replies: 5
• Views: 8,724
07-09-2012, 05:50 AM
28. ### Help

I too am having trouble with ANOVA. I have 2 questions that I need assistance with. Question 1: Test the claim that the samples come from...

• Replies: 3
• Views: 8,718
11-29-2005, 10:11 PM
29. ### Geometric mean of normally distributed independent random variables

Hi all, I have a large set of identical normally distributed random variables, all positive and independent, with the same known Mu and Sigma for...

• Replies: 5
• Views: 8,715
06-24-2013, 06:53 AM
30. ### Change scores for pre-post design

Hello One group of participants were measured on 6 items pre- training course. The same group of participants were measured on the same items...

• Replies: 3
• Views: 8,704
02-23-2011, 03:10 PM
31. ### double exponential decay and tau calculation - 2 programs, different answers, no clue

Hi Background: I am volunteering in a lab doing some calcium imaging experiments. The way similar experiments worked in the past, the lab only...

• Replies: 0
• Views: 8,691
03-09-2010, 06:20 PM
32. ### t-score & probability

Well, I had a question given to me and I cannot find my way to agree with the supposed answer. The question was: If there are 100 participants in...

• Replies: 0
• Views: 8,687
10-26-2007, 10:40 AM
33. ### Kruskal Wallis Test - Minimum Group Size?

I have 23 subjects, and I want to make comparisons of the distribution of a measurement (with non-normal distribution) across several categories. In...

• Replies: 2
• Views: 8,669
08-06-2012, 08:20 PM
34. ### Error in parabolic regression of data points

I have some data points, each with a specific (but different) error (standard deviation). I fit a parabolic curve to the data points using least...

• Replies: 11
• Views: 8,663
11-03-2010, 10:57 PM
35. ### Unequal sample sizes and statistical tests

Dear all, I need you help urgently, and I want to thank you all for that. My question is as follows, I have two groups’ j and k and I have two...

• Replies: 3
• Views: 8,660
06-05-2008, 09:53 PM
36. ### Poisson or binomial and nCR or nPr

Hi, How do you tell the difference between: 1) Poisson and binomial distribution, and 2) nCr and nPr? I guess I'm confused between which to...

• Replies: 1
• Views: 8,656
11-23-2010, 06:29 AM
37. ### Statistics Homework Help

1.) Calculate SS, variance, and standard deviation for the following population of N 7 scores: 8, 1, 4, 3, 5, 3, 4. 2.) A population has a mean...

• Replies: 2
• Views: 8,653
08-18-2013, 05:09 PM
38. ### logistic regression for comparison of two gropus

Is it okay to use logistic regression to compare a variable between two groups? (as a non-parametric alternative to t-test when its assumptions are...

• Replies: 7
• Views: 8,649
05-21-2011, 01:57 AM
39. ### 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: 8,647
05-31-2011, 03:56 AM
40. ### Box Model

Hey everyone, I need help in creating a box model for a gambling game of dice rolling. So a person pays \$7.50 in order to play a game which...

• Replies: 1
• Views: 8,635
01-11-2010, 02:35 PM
41. ### P value query and SPSS problem

Hi all, This is probably a really stupid question, I apologise. If my Independent Samples T test in SPSS returns a P - value (Sig.(2-tailed) of...

• Replies: 3
• Views: 8,634
07-19-2009, 06:15 AM
42. ### expected value proof

x is normally distributed with mean=0 and variance=1. Show E(abs(X))=squrt(2/pi). abs(x)=absolutel value. Since it is normally distributed I...

• Replies: 5
• Views: 8,614
06-06-2011, 12:50 AM
43. ### Two-Sample Interpretation of data

Ok this one if gonna be a little hard to copy from the book.... Q: A study of the self-concept of seventh-grade students asked if male and...

• Replies: 3
• Views: 8,599
12-04-2005, 10:18 PM
44. ### Hypothesis testing questions

1). If the hypothesis test is conducted using α = .025, this means that: a. there is a 2.5% chance that the null hypothesis is true b. there is a...

• Replies: 2
• Views: 8,582
06-01-2010, 10:31 PM
45. ### Beta-Slope?

Hello, I am working on how to calculate a Beta for a security. I have learnt it in the excel but I dont know why Slope function is used to...

• Replies: 3
• Views: 8,581
06-19-2012, 02:28 AM
46. ### non normal distribution and regression

Hi, If the distribution of y variable is not normal. (skewness equal to 1.1 and kurtosis to 8.2) can i run a simple linear regression of the y on...

• Replies: 1
• Views: 8,580
04-18-2007, 11:20 AM
47. ### SPSS help: 1-way repeated measures ANCOVA

hi, was hoping to find some help with this problem. Trying to set up a repeated measures ANCOVA comparing dependent variable at different times,...

• Replies: 1
• Views: 8,579
10-08-2009, 06:45 PM
48. ### Fisher's Exact Test

Hello,:wave: I'm currently a doctoral candidate in wildlife ecology. I'm analyzing habitat selection data for bullsnakes collected over three...

• Replies: 8
• Views: 8,576
03-26-2014, 07:32 AM
49. ### Cell count too low for chi-square, too high for Fisher?

Hi there, Any help with this would be much appreciated! I'm working on comparing two binary data sets that represent the presence or absence of...

• Replies: 3
• Views: 8,572
08-07-2009, 10:58 AM
50. ### Percentile Rank problems!

I can't figure this out and need help ASAP. If the percentage of of a quantitative GRE score of 650 is 93.32, how do I find the GRE score that...

• Replies: 4
• Views: 8,558
09-24-2008, 02:38 AM
51. ### Multiple choice

Hello, I have some questions: A researcher wants to determine the mean income of adults in a particular state. She decides to tae a random sample...

• Replies: 4
• Views: 8,551
01-13-2006, 08:47 AM
52. ### Welch's t test

Short question; when do I use Welch's t-test? I don't quite get the "unequal variance"-thing. What does it mean that there is unequal variance and in...

• Replies: 6
• Views: 8,550
10-30-2013, 06:19 AM
53. ### Need help bad. Probability and sample mean

I have a test on Monday and can not figure out this problem. I'm drawing a blank with what to do. A population has a mean of 300 gallons with a...

• Replies: 3
• Views: 8,543
04-02-2011, 08:49 PM
54. ### 99% confidence interval

I have worked on this problem for awhile trying it different ways - A random sample of 250 students at a university finds that these students take...

• Replies: 1
• Views: 8,540
04-13-2010, 10:30 AM
55. ### Questions on Type 1 and Type 2 error

Under hypothesis testing discussion of Type1 and Type 2 errors topic seems to be a bit confusing. Where can i find lot of questions on that topic. I...

• Replies: 7
• Views: 8,526
09-14-2011, 03:55 AM
56. ### Large z-score

Hi! I have calculated a z-score of 8.759. When I use Table Z there's a note at the bottom that says ' For z >= 3.90, the areas are 1.0000 to four...

• Replies: 2
• Views: 8,525
10-15-2008, 11:42 AM

The Voyage of the St. Andrew Throughout the picturesque valleys of mid-eighteenth-century Germany echoed the song of the Neul&#228;nder (newlander)....

• Replies: 0
• Views: 8,507
04-27-2008, 12:16 PM

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