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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: 197,024
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: 66,889
09-30-2005, 09:44 AM
1. How many samples do I need for allele frequency analysis?

Hi, I want to know a proportion of alleles in a population. If a genetic locus that I'm interested in is biallelic (i.e. two alleles: A & a),...

• Replies: 0
• Views: 959
03-13-2013, 12:22 AM
2. Help in Stata; Simulation

Hello All, I am a beginners user in Stata and I am working on an assignment that requires me to run a simulation for a regression function. I...

• Replies: 0
• Views: 1,495
03-12-2013, 04:26 PM
3. Multiple comparison test, with ambiguous labels/ranks

In a clinical study, I have patient's health condition labeled as grade 1, 2, or 3. Some patients are labeled as "Either 1 or 2" by the doctor,...

• Replies: 3
• Views: 1,780
03-12-2013, 03:07 PM
4. SPSS Stats help URGENT

Hey guys, I am very sorry to bother you but I am wondering if you could help me with a Stats question for a project I am working on. It is bit...

• Replies: 1
• Views: 1,002
03-12-2013, 10:55 AM
5. Statistics question

Hi I am working on a project and would like people's opinions on the statistics, if possible? I am looking at a new processing and cutting...

• Replies: 1
• Views: 1,161
03-12-2013, 07:55 AM
6. direction of association between nominal and ordinal variables

Hello, I have a question about which test are appropriate to find direction of association between a nominal and an ordinal variable. I have...

• Replies: 1
• Views: 2,206
03-11-2013, 04:19 PM
7. Time-Varying VCV Matrix

2asdfasdfasdf

• Replies: 0
• Views: 2,048
03-11-2013, 07:38 AM
8. Statistical tests

Hi. I need to compare two groups of data. And a person told me that I can apply a A, M or t test. A t test I know. But, what is a A or M test?...

• Replies: 7
• Views: 1,567
03-11-2013, 05:29 AM
9. Study Guide Help: Standard Deviation and Percentiles

Hi all, I have a question that asks: Many test scores are (approximately) normally distributed. Your professor reports that the midterm average...

• Replies: 3
• Views: 2,730
03-11-2013, 01:57 AM
10. Pearson and the assumption of normality

Hello I read (here) that apparently Pearson's r does not require your variables to be normally distributed, only that the variables are...

• Replies: 0
• Views: 1,492
03-10-2013, 08:44 PM
11. Seasonal Time Series

Suppose X_t = (\alpha + \beta{t})S_{t} + e_{t}. Define C_{12} = 1 - B^{12} as the backshift operator. Assume S_{t}=S_{t-1} for all i. Is C*X_{t}...

• Replies: 2
• Views: 1,096
03-10-2013, 08:17 PM
12. Finding constant c such that a quantitiy has a t-distribution

Here is my question, and I am not exactly sure where to start: Question: Let X1, X2, ... , X5 be a random sample from of size n = 5 from N(0,...

• Replies: 0
• Views: 1,845
03-10-2013, 07:38 PM
13. Anderson-Darling - Test for Lognormality

I am testing for Lognormality of the following data (R-Code): fish <- c(0.6,0.7,1.1,1.3,1.8,2.0,2.3,2.7,2.9,3.1, ...

• Replies: 0
• Views: 3,665
03-10-2013, 07:32 PM
14. ANOVA - interpreting the results

I'm simplifying my problem here, but assume I run a one-way ANOVA, and my independent factor has three levels, A, B and C. I run the ANOVA and find...

• Replies: 5
• Views: 1,557
03-10-2013, 02:29 PM
15. MLE for beta distribution

I am working on a problem to find the MLE with respect to \theta for the following distribution X: X = \theta Z for some \theta > 0 with ...

• Replies: 3
• Views: 4,592
03-10-2013, 11:47 AM
16. Trying to evaluate/measure how much 1 variable affects another.

Hello. So I've been helping look at some data for a fundraising event my school ran. We used an app and the school wants to evaluate if it is...

• Replies: 0
• Views: 1,553
03-10-2013, 10:08 AM
17. Do post-hoc tests take repeated measures into account?

Hi, I've tried finding an answer to this question but can't find one anywhere :-/ If you perform a repeated measures design experiment (for...

• Replies: 1
• Views: 1,309
03-10-2013, 06:05 AM
18. Testing non-parametric data against an optimal value (Wilcoxon Signed Rank Test?)

Hi everybody, I'm doing a master in Educational Science and had to do a questionnaire on student teachers' belliefs on interactional strategies. ...

• Replies: 0
• Views: 1,011
03-10-2013, 05:02 AM
19. Distributions

I realise this is going to annoy some of you for its simplicity, but when I was "interviewed" I said I wanted to understand more about distributions....

• Replies: 13
• Views: 2,471
03-09-2013, 11:38 PM
20. Methods to find an optimum k in k-means clustering algorithm

Hi all, What would be the most popular or most successful or most recent method to determine the number of clusters in the k-means algorithm? I...

• Replies: 0
• Views: 1,164
03-09-2013, 10:51 PM
21. Correcting Sample Bias

Hey everyone! Great forum, so glad i found it. :tup: Would appreciate if anyone could help with a problem i have with a report I'm writing on...

• Replies: 3
• Views: 1,433
03-09-2013, 09:46 PM
22. Analyzing the percent of time present in 5 areas

I was trying to figure out the best way to analyze a divided area used by an animal and the percent of time this animal spent in each of the 5 areas....

• Replies: 0
• Views: 1,268
03-09-2013, 07:15 PM
23. interpreting standard deviation in decimal format...

Hi all I'm working on a problem that says identify when the time series goes above or below 1.5 Standard deviations. The standard deviation is...

• Replies: 0
• Views: 1,467
03-09-2013, 05:20 PM
24. Max likelihood and bayesian stats in phylogenetic analysis

Hi, I'm writing doing a phylogenetic analysis and I'm a bit stuck in writing a brief description of max likelihood and bayesian analysis. Could...

• Replies: 6
• Views: 1,119
03-09-2013, 02:47 PM
25. Probability and normal distributions

Hello everyone. :wave:

• Replies: 1
• Views: 1,186
03-09-2013, 12:53 PM
26. Novice: Help deciding which statistical method to use

Hi, I am having some trouble deciding which statistical method to use for example data such as the one below. Basically, I want to see how...

• Replies: 2
• Views: 1,452
03-09-2013, 10:12 AM

I am having trouble with this question The following data is the age at death (in days) for infants who died from sudden infant death syndrome...

• Replies: 2
• Views: 2,924
03-08-2013, 09:15 PM
28. Optimus estimatorin

Hi, I'm looking for the best estimator for estimate de number of corners a football team get in a match. At this moment I have a data sheet with...

• Replies: 0
• Views: 1,304
03-08-2013, 07:30 PM
29. Aggregating across data sets

First, I just want to say that I am as green is it gets regarding statistics, but am hoping someone here can help me do a sanity check. Right now,...

• Replies: 0
• Views: 995
03-08-2013, 02:53 PM
30. Exponential Distribution Help Needed

Hello all. I am having trouble with the exponential distribution in general, but specifically on the following problems: 4.2.2) Suppose that you are...

• Replies: 2
• Views: 2,831
03-08-2013, 02:15 PM
31. need a push in the right direction.

Hello all, I am new here and I thank you for reading this and possible suggestions, I would very appreciate it if someone could direct me in the...

• Replies: 0
• Views: 1,203
03-08-2013, 09:07 AM
32. Expressing a time series in more detailed time interval using approximations

Hello, I have a time series with a dependent variable (electricity comsumption) measured on a daily basis. I have also an independent variable...

• Replies: 0
• Views: 1,249
03-08-2013, 08:22 AM
33. Help with basic probability word problem.

deleted........

• Replies: 0
• Views: 1,343
03-08-2013, 03:53 AM
34. Correlation and Movements

Hi there... I have a question pertaining to correlation and movements... lets say we have 2 variables X and Y. If X & Y are correlated to...

• Replies: 6
• Views: 1,226
03-07-2013, 05:49 PM
35. Testing means of means

I received mean data for individuals and want know if I find the mean of the means and conduct a single sample ttest or nonparametric equivalent with...

• Replies: 5
• Views: 1,234
03-07-2013, 04:04 PM
36. Determining a particular test for this situation

Hello, everyone! This is my first post here. First, let me say thanks to everyone active at this forum. It's really cool that you guys donate your...

• Replies: 1
• Views: 1,291
03-07-2013, 02:01 PM
37. Umvue

Hi all, i'm quite stuck with the following problem: Let X₁.....Xn be i.i.d Bernoulli Random Variables with parameter p, i.e Pr = P. It is...

• Replies: 1
• Views: 1,951
BGM
03-07-2013, 01:50 PM
38. Test the results from a Monte Carlo study

Hello, I have conducted a Monte Carlo study with 200000 simulations of a value and I want now test if the mean of these simulated are equal to the...

• Replies: 1
• Views: 1,759
03-07-2013, 10:49 AM
39. Spearman vs Kendall, tied ranks

I am running a non-parametric correlational analysis, and I am not sure about if I should use Spearman or Kendall. Kendall is recommened if there is...

• Replies: 0
• Views: 2,505
03-07-2013, 07:15 AM
40. Factorization Theorem for Sufficient Statistic

Hi, I am working through a problem using the Fisher–Neyman factorization theorem. Show that \prod_{i=1}^{n}X_i and \sum_{i=1}^{n}X_i are...

• Replies: 6
• Views: 2,831
03-07-2013, 01:21 AM
41. Playing Marco Polo with mutes.

Hello, I am in the dismal position of having to teach myself statistics. It is not unlike playing Marco Polo with mutes. I am not trying to score...

• Replies: 0
• Views: 1,158
03-06-2013, 11:14 PM
42. Fitting a zero-inflated normal

Hi everyone, I have what (to me) seems like it should have a relatively simple solution but I'm struggling to find one. I'm fitting a pretty...

• Replies: 0
• Views: 2,051
03-06-2013, 11:08 PM
43. Don't Really Know where to start

Suppose that a restaurant includes a free toy with every kid’s meal. There are five types of toys, and a kid wants to collect at least one of each...

• Replies: 1
• Views: 1,144
BGM
03-06-2013, 10:14 PM
44. Needs tutoring with lisrel

I am new to lisrel. And I am hoping to find a tutor for a couple of hours to teach me how to perform some analysis with the software. If you have the...

• Replies: 0
• Views: 1,377
03-06-2013, 05:14 PM
45. Minimum to run Spearman's or Kendall

Hi What is the minimum number of values to run Spearman's rank correlation coefficient and min to run Kendall tau rank correlation coefficient ?...

• Replies: 4
• Views: 1,603
03-06-2013, 10:50 AM
46. I need help with cross-country data and regression over a specific time period

Hi all :wave: I have lagged data for 50 countries over years 1981-1988 and the data for dependent is from 1989-1997. The model contains GDP growth...

• Replies: 1
• Views: 3,299
03-06-2013, 10:32 AM
47. Z - Test

Morning guys, I'm new to this forum, and was wondering if I could get some help trying to answer a question I've been working on for the last day,...

• Replies: 5
• Views: 1,956
03-06-2013, 10:03 AM
48. DOE for rock paper scissor analysis - suggestions for analysis needed!

Hi, I am in a design of experiments class at my university. We are analyzing rock-paper-scissor strategies and results among females and males on...

• Replies: 8
• Views: 1,695
03-05-2013, 06:02 PM
49. Confused about different Z formulas

Hello, I'm confused about the two different Z formulas: z = (X-bar - mu) / (std dev) and z = (X-bar - mu) / When do you use the sqrt of...

• Replies: 4
• Views: 1,322
03-05-2013, 05:36 PM
50. help in two way anova

hello! pls I need some help in my dissertation analysis, am using a two way anova method and I happens to have negative values in my f-ratio values,...

• Replies: 6
• Views: 3,564
03-05-2013, 05:05 PM
51. Calculating the Power of the test

Hello, I'm very confused about my homework. I'm trying to calculate the power of the test and draw a power curve. Very confusing. I've got the...

• Replies: 1
• Views: 1,429
03-05-2013, 04:12 PM
52. p-value cutoff for Wilcoxon rank sum test

Hi all, I am using Wilcoxon rank sum test with continuity correction in order to determine if the differences in boxplot are significant. Does...

• Replies: 2
• Views: 2,588
03-05-2013, 03:10 PM
53. Calculate Confidence Interval of Parameters of a Fitted Distribution

I have a data set obtained experimentally that I expect to be lognormally distributed (deviation from this distribution in the experimental data I...

• Replies: 5
• Views: 2,186
BGM
03-05-2013, 12:40 PM
54. Why does the grade distribution among students in a test is similar to a normal dist?

It seems everything can be described as a normal distribution. The question is why. For instance, after each test, the distribution of grades in a...

• Replies: 7
• Views: 2,202
03-05-2013, 12:00 PM
55. Mann–Whitney U tests around mean or median?

Hello. So I helped run a fundraising event earlier this year that used an app, and we're now trying to measure if people the used the app...

• Replies: 4
• Views: 35,000
03-05-2013, 11:46 AM
56. Before and after comparison using ANOVA

I have 3 groups of people (A, B, C). I measure the baseline (BLBP) blood pressure for all 3 groups. I put each group on a different diet for 6...

• Replies: 0
• Views: 2,302
03-05-2013, 10:57 AM
57. Survival Analysis SPSS: Repeated Events

Dear TalkStats Forum, Does anyone have experience using SPSS for survival analysis when there are repeated events? the good news is, I'm...

• Replies: 2
• Views: 2,414
03-04-2013, 07:58 PM
58. Hazard Function

Q: Given the following Hazard Function: 2t^2, what is P. I recently had this on an exam and know that the Hazard Function is the PDF/Survival...

• Replies: 4
• Views: 1,857
03-04-2013, 01:58 PM
59. MANOVA question regarding writing up main effects

My professor had us run main effects of MANOVA in two different orders in order for us to understand the impact of ordering variables. In this...

• Replies: 2
• Views: 1,738
03-04-2013, 01:23 PM

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