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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: 196,909
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: 66,829
09-30-2005, 09:44 AM
1. ### alpha? p-value?

Hi everyone, I am very confused with p-value and alpha. I do appreciate your help. Please take a look at the following questions and answers: ...

• Replies: 7
• Views: 77,892
BGM
01-03-2012, 09:09 AM
2. ### non-parametric post-hoc tests

Hi, Does anyone know what the proper non-parametric post-hoc test to use with multiple groups? (3, 4, 5). We have run the Kruskal-Wallis anova so...

• Replies: 7
• Views: 53,138
02-24-2011, 07:46 PM
3. ### t test minimum sample size

hello i have a problem: i have to different expperiments yielding time values, the one done in triplicate the other in dublicate. now i wanted to do...

• Replies: 7
• Views: 13,866
05-04-2011, 08:43 PM
4. ### one sample t-test --> nonparametric equivalent?

Dear all, this is my first post in this forum, in which it seems many people find help and share insights :). Working on my MBA thesis, I might...

• Replies: 7
• Views: 16,719
12-19-2011, 06:13 PM
5. ### Requirements for a probability density function?

i am trying to develop a PDF that i will use to model height of trees in a certain forest.Can you give me some requirements for a PDF and explain...

• Replies: 7
• Views: 18,012
10-30-2011, 05:39 PM
6. ### Doubt on partial correlation SPSS output

Hello there, I'd need some help interpreting the output of a partial correlation analysis. The background is quite simple: I have two group of...

• Replies: 7
• Views: 9,508
01-27-2011, 10:31 AM
7. ### Homework question about confidence interval for an estimator

Hi again guys, Sorry to bother you with this, but I thought it might be interesting to someone here. I'm finishing up a homework assignment and am...

• Replies: 7
• Views: 2,552
02-10-2011, 06:07 PM
8. ### 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: 8,717
03-11-2011, 02:35 AM
9. ### Should I use Mann-Whitney?

I have two independent, unpaired samples. Both distributions are non-Gaussian. One is plant data (n=95), the other is insect data (n=48). Both sets...

• Replies: 7
• Views: 6,642
02-22-2011, 07:02 AM
10. ### Multivariate Statistical analysis + Google Analytics

Hello Guys, I'm happy I found you from Google :-) I was given a dissertation topic which contains multivariate statistical analysis of data...

• Replies: 7
• Views: 5,415
02-24-2011, 03:29 PM
11. ### 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: 8,638
05-21-2011, 01:57 AM
12. ### 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 ...

• Replies: 7
• Views: 20,902
03-27-2011, 01:01 AM
13. ### 2 eyes --> One problem

Hi all! I am an optometrist doctorandum student in Madrid. I am comparing vision of people with a strange disease afecting eyes and normal people. ...

• Replies: 7
• Views: 3,755
03-31-2011, 04:47 PM
14. ### Factor analysis

I am running a factor analysis on 20 variables or so. If i only include 16 or so of the variables I get a result that makes sense giving 4...

• Replies: 7
• Views: 2,941
04-14-2011, 10:17 AM
15. ### Multiple dependent proportions problem - Election

Hello, I have spent a few hours trying to untangle this problem by my knowledge of statistics appears to be too limited for me to come to a...

• Replies: 7
• Views: 3,925
06-09-2011, 03:27 PM
16. ### multiple choice homework help

I have a big multiple choice assignment due in a couple of days and to be honest I have no clue where the professor pulled some of these questions...

• Replies: 7
• Views: 2,646
04-24-2011, 02:46 PM
17. ### maximum likelihood estimator

Hi, any help with the following problem would be appreciated. I have the pdf f(x) = ba^-b, 0<x<a, a>0, b>0 I got a joint likelihood...

• Replies: 7
• Views: 2,523
05-01-2011, 10:02 AM
18. ### Bootstrapping

I have a 6000 rows dataset with an incidence rate of 3% (200 Ayes). I am trying to fit a logistic model to predict the probability of 1. I read on...

• Replies: 7
• Views: 3,210
SPR
05-11-2011, 01:23 PM
19. ### significant difference between three proportion??how??

hello thank you for best sit. I have a question. when we have just three proportion how we do say there are significant difference between them?...

• Replies: 7
• Views: 10,319
hol
05-23-2011, 12:47 AM
20. ### Concatenating Vector of Strings in R

I have a vector (Label) of length 500 with first few elements as: AAA ABM ACD ADR I want to create a new vector (NewLabel) such that it's...

• Replies: 7
• Views: 12,379
05-23-2011, 09:01 PM
21. ### Problem with 90% Confidence Level

I have this problem that i am working on and there must be something that i am just missing or do not understand. I have minitab and tried to find...

• Replies: 7
• Views: 3,551
06-22-2011, 01:30 PM
22. ### Covariance

I have a problem with a contingency table for X=1, 2, 3 and Y = 1 and 2. In a related question, the correlation is asked for X and Y. As far as I...

• Replies: 7
• Views: 3,035
06-18-2011, 04:57 PM
23. ### Is my variable count or measurement and what statistical model would be best?

I am trying to assess the fine-scale spatial distribution of tadpoles along a depth gradient in relation to abiotic and biotic factors -- and am...

• Replies: 7
• Views: 4,079
06-24-2011, 08:58 AM
24. ### plotting a histogram

I need to draw a histogram in R for two vectors , one is the x axis and the other is y axis thanks in advance for your help

• Replies: 7
• Views: 3,386
06-25-2011, 02:43 PM
25. ### Log Normal distribution

Hello everybody, I need to fit the log normal distribution to my data using R. Which is the more accurate taking the log and fit the normal...

• Replies: 7
• Views: 3,752
11-22-2011, 10:35 AM
26. ### Turning Football Statistics into a Formula

Hey Everyone, So I was trying to make sense of some football statistics in Microsoft Excel (no this isn't an Excel question) and I couldn't figure...

• Replies: 7
• Views: 4,915
07-05-2011, 05:33 PM
27. ### Help on an experiment

Hello, I have the following setting to an experiment: There are N objects: Obj_1 can have the value either "red" or "black". Obj_2 can have the...

• Replies: 7
• Views: 2,529
07-28-2011, 06:14 PM
28. ### Quiz on distribution of sample mean

X~B(40,0.3) , n=49 , Find P(X(mean) >= 13) . [I got down to P(X(mean) >=13) = P( Z >= ((13- 1/98) -12)/ root(40*0.3*0.7/49)) My answer...

• Replies: 7
• Views: 2,432
08-12-2011, 09:58 PM
29. ### calculating Z-Scores

hi everyone, ive been trying to figure out this problem for the past hour and couldnt figure it out and i hope that some of you can shed some light...

• Replies: 7
• Views: 3,313
08-11-2011, 04:51 PM
30. ### Type II error calculation

My question: It is desired to test H0: μ = 55 against H1: μ < 55 using α = 0.10. The population in question is uniformly distributed with a standard...

• Replies: 7
• Views: 13,119
08-14-2011, 12:42 PM
31. ### Statistical test with multiple variables?

I did an experiment where I have two types of enzyme: immobilised and free, and three different concentrations: 25, 50 and 75%. I have the data for...

• Replies: 7
• Views: 4,158
08-16-2011, 06:42 PM
32. ### 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: 8,792
08-25-2011, 02:39 PM
33. ### ANOVA - (1 Dataset - 2 Samplings) - Which ANOVA Function?

Okay so let me first say thank you to the board... Statistics is the hardest course I have ever taken, understanding it is SO HARD... until it...

• Replies: 7
• Views: 3,878
09-04-2011, 01:17 PM
34. ### sum of independant poisson processes help

HI, I've a question that says accidents to people and animals are independant poisson processes with intensity lambda and mu respectively. I'm asked...

• Replies: 7
• Views: 4,292
BGM
10-20-2011, 02:12 PM
35. ### 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: 8,506
09-14-2011, 03:55 AM
36. ### Basic question

Hi When I have a dataset {x} consisting of N measurements, and I find the standard deviation by the standard expression sigma^2 = (1/N) * sum {...

• Replies: 7
• Views: 2,077
09-14-2011, 11:48 AM
37. ### Discussing a model design

I am a software developer and like stats but no professional so I would like your opinon on how to build a concrete statistical model the goal is to...

• Replies: 7
• Views: 2,330
09-19-2011, 07:34 AM
38. ### def. of linear model

Is y = B1x1 + B 2x2 + B1 B2x3 + a linear model? Ie. would you say that it is linear in it's regression coefficients?

• Replies: 7
• Views: 1,947
09-26-2011, 03:28 PM
39. ### I believe Kruskal-Wallis is the right choice, but where do I go from there?

Assumption: Tertiary wing feathers are warmer Hypotheses: 1) During cold weather feather mites will accumulate on the tertiary wing feather 2)...

• Replies: 7
• Views: 3,654
10-11-2011, 07:25 AM
40. ### fixed-effects or random-effects ANOVA

Hello, I have a big study to analyse and I am unsure of which technique to use. I have a group of patients suffering from disease 1. This group...

• Replies: 7
• Views: 3,842
11-24-2011, 12:00 PM
41. ### help guys. Goodness of fit

i dont know how to solve for expected frequency because i have 9 proportion? help

• Replies: 7
• Views: 2,640
10-03-2011, 10:55 PM
42. ### Nonparametric statistics v.s Parametric statistics

Why nonparametric statistics is less preferred compared to parametric statistics even if it requires fewer assumptions?

• Replies: 7
• Views: 4,241
10-19-2011, 05:11 AM
43. ### IID vs IIA; mixed vs conditional vs multinomial logit models

I am reading books on categorical data analysis. are the assumption of indepently and identically distributed (errors terms) and independence of...

• Replies: 7
• Views: 9,818
10-11-2011, 08:30 PM
44. ### I don't know how to tell if something is significant or not

I don't know how to tell if a value passes the critical region or not. What does it mean if something is significant at the .01 level? How do I tell?...

• Replies: 7
• Views: 56,000
10-11-2011, 10:45 PM
45. ### Ordinal data+ independent factors+Marketing analysis+SPSS= HELP!!!!

Hi, I desperately need help analyisng my survey data. Which tests do i use in order to test the relationship between my variables, and to see...

• Replies: 7
• Views: 3,367
10-26-2011, 09:07 PM
46. ### Model with no significant variables

Hello all! I worked on an observational study and after many hours of cleaning up data and making it less biased, I've unfortunately found that none...

• Replies: 7
• Views: 3,167
11-15-2011, 01:01 PM
47. ### Gini coefficient for a uniform distribution of wages

I need to compute the Gini coefficient for a uniform distribution of wages between a lower bound L and a higher bound K. What formula should I...

• Replies: 7
• Views: 5,339
11-16-2011, 04:55 PM
48. ### Quick help understanding a likely easy question

Hello, I was wondering if someone could help me intrepet these regression results. I am looking at an economics paper regarding racial bias in the...

• Replies: 7
• Views: 1,877
12-08-2011, 04:35 AM
49. ### Four variables - creating a number

Hello. So I'm running a test that is going to have four variables, each is essentially a rating of 0-4 if something is present. However, I'd like to...

• Replies: 7
• Views: 2,322
12-13-2011, 07:08 PM
50. ### [SOLVED] chi-square, regr.analysis, help please!

Hi to all! I am answering some statistics questions from the course I have in statistics, and have some problems answering them. I thought somebody...

• Replies: 7
• Views: 2,553
01-28-2012, 12:45 PM
51. ### Chi-square problem

I have a problem that I believe I can solve using a chi-square, however I need to check on the details to make sure I am right in my interpretation...

• Replies: 7
• Views: 2,625
01-28-2012, 07:11 PM
52. ### Interpret results for a proportion end point.

I am doing a study to determine the efficacy of a drug. The efficacy of the drug is measured as the proportion of patients with HbA1c (diabetes...

• Replies: 7
• Views: 3,762
02-01-2012, 06:09 AM
53. ### Eefect size

Hi.. i have a question on effect size..i get a negative value of effect size..should i report it as an absolute value or a negative value.. and...

• Replies: 7
• Views: 2,434
02-07-2012, 07:38 PM

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