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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: 196,960
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: 66,858
09-30-2005, 09:44 AM
1. What F value stands for in ANOVA analysis?

Hi everyone, When I do ANOVA test, I notice in the output many values among them P, F values. Could somebody please tell me what F value in...

• Replies: 11
• Views: 314,298
05-27-2015, 08:09 AM
2. R Squared Value, Anything other than indicator of how much variance is accounted for?

Hi all! Long time lurker but first time poster, normally been able to find everything I need on here! Having a bit of bother with a non-linear...

• Replies: 11
• Views: 1,663
01-06-2014, 06:32 PM
3. Multple Regression

I am doing research on the effect of online professional development on educators use of technology in the classroom using the seven constructs of...

• Replies: 11
• Views: 1,777
01-07-2014, 01:38 PM
4. Help Needed in Statistical Analysis of Simulation Results

Hello Fellow Members, I am a novice in statistical analysis. I have a situation and I do not know what to do. Request you the learned guys please...

• Replies: 11
• Views: 2,887
12-20-2013, 08:36 PM
5. Needd Help Choosing Test : More than Two Proportions using SPSS

New in Statistics: Help needed to choose the Correct Test: ( maybe Chi-square): I have following information: Type1 Type2 Type3 Type4 ...

• Replies: 11
• Views: 3,432
09-07-2014, 11:15 AM
6. Deviance for "neutral"

Hello, if I define a numerical scale from 1 to 9, where 1 is "very negative" and 9 is "very positive" and define 5 as the value for "neutral",...

• Replies: 11
• Views: 2,058
02-24-2015, 02:46 PM
7. Simple problem

Hi all. Just have a quick question. If I have a measure and its SD, say 1.24 metres (0.3), how do I calculate the new SD if I change the measure...

• Replies: 11
• Views: 2,165
07-19-2015, 01:19 PM

I'm having a problem with a US stats software provider that insists on classifying PhD work as commercial if the student has any detectable...

• Replies: 11
• Views: 2,198
09-26-2015, 04:30 PM
9. Main effect vs. Interaction effect in ANOVA

I think that a researcher is in general more likely to find a significant main effect than a significant interaction effect in ANOVA. Do you agree...

• Replies: 11
• Views: 2,547
11-30-2015, 04:04 PM
10. Which test should I use for two unequal groups ?

Hi all! I have data that include 20 samples divided into 2 groups (category A and category B). The groups are independent, none of the value in...

• Replies: 11
• Views: 3,341
12-11-2016, 04:37 PM
11. Multicollinearity issue

Hi, I have a multivariable logistic model, and one of my categorical independent variables has 5 possible levels, with each level calculated as a...

• Replies: 11
• Views: 3,426
12-28-2016, 10:10 AM
12. Need help please, should I use ANOVA or chi square?

Hi there! I am trying to work on a university paper and I am having a hard time with the stats part. I have asked some participants (29) to...

• Replies: 11
• Views: 514
08-31-2017, 10:56 AM
13. How can I determine if two graphs are statistically significantly different

Hi, I'm working on a medical research project and need some stats help. I have limited statistical knowledge but I understand that basics. I need...

• Replies: 11
• Views: 556
09-09-2017, 12:38 PM
14. Employee Performance Project Help

Hello all, I have a project I'm working on and I need some advice. I have only a very basic knowledge of stats. Here goes... Your company has a...

• Replies: 10
• Views: 4,670
11-13-2005, 08:20 PM
15. statistics Books

Hi everybody, I am new to this forum. I am a technical Analyst. I do analysis for Computer Systems using statistics. I am interested to learn...

• Replies: 10
• Views: 6,537
06-07-2007, 09:12 AM
16. z-score nightmare

ok, I read the thread about not doing someones homework for them. I have worked this problem, and can't figure out what the H I am doing wrong. ...

• Replies: 10
• Views: 4,107
08-07-2007, 04:08 PM
17. pattern probability

This isn't homework, but wasn't sure where else to post it. For the following pattern: AA..K.V.. (where . represents any character - there are...

• Replies: 10
• Views: 3,168
08-13-2007, 11:32 AM
18. P value of a statistical test

If the p-value of a statistical test is .038 and the level of significant chosen for the hypothesis tst if .05 then. I believe the correct answer...

• Replies: 10
• Views: 6,405
05-28-2008, 10:00 PM
19. Which test to use?

I am a doctoral candidate doing research on personality differences between IT and CS professors. To simplify my question, I have changed the topic...

• Replies: 10
• Views: 3,354
11-03-2008, 05:54 PM
20. variance of population mean...

.. when the population consists of two sub-populations. size of sub-population1: 20.000 size of sub-population2: 10.000 size of sample...

• Replies: 10
• Views: 5,091
zxc
11-08-2008, 08:43 AM
21. selecting ANOVA over T test

Hello, I am a graduate student in science preparing for my defence and taking a bit of heat regarding the statistical test I chose for an...

• Replies: 10
• Views: 3,924
12-02-2008, 09:44 AM
22. One-tailed to two-tailed

My homework problem is the following... The P value is 0.80, and this is a one-tailed P value. What is the P value if this study becomes two-tailed?...

• Replies: 10
• Views: 6,304
12-02-2008, 07:44 PM
23. simple normal distribution question

Hello, studying for a test and need to make sure.. If X1 - X2 ~ N(0, 2 sigma^2), how do I convert them to N(0,1)? What is the general formula for...

• Replies: 10
• Views: 3,383
04-25-2009, 11:07 AM
24. descriptive statistics, easy question

hello, I got a small question, I think I know the answer and just want to confirm it with you guys: A researcher is interested in comparing the...

• Replies: 10
• Views: 4,824
10-14-2009, 07:07 PM
25. Rank data-proper test

Ok I will admit I am getting old, and out of practice so those graduate level classes might not have been useful :-) I have 3 data sets. Within...

• Replies: 10
• Views: 3,837
12-17-2009, 12:32 PM
26. Need to solve this equation

I am trying to solve the following equation for Tc (Temperature in celsius). My end goal is to map the curve of the relationship between temperature...

• Replies: 10
• Views: 4,135
08-19-2010, 01:42 PM
27. What if ANOVA post-hoc isn't significant, but T-test is?

The general question I have is, what do I do when a post-hoc difference comparison of 2 means form an ANOVA (that has a total of 4 groups) shows no...

• Replies: 10
• Views: 24,204
06-10-2010, 05:42 PM
28. Calculating Coefficients of regression with discrete Predictors

I know that in case of interval predictors, the coefficients such as beta are the slope of the line and have a specific formula. But, what would be...

• Replies: 10
• Views: 4,927
07-14-2010, 06:47 PM
29. finding distribution

Let X_{1}, X_{2}, ... X_{n} be a random sample from a distribution with pdf f(x;\theta) = \frac{1}{\theta} , 0<x \le \theta . The cdf of X is ...

• Replies: 10
• Views: 3,600
BGM
09-14-2010, 12:03 PM
30. Probabilities of Geometric Random Variables question

W(1) and W(2) are independent random variables with parameters p(1) and p(2). It asks to find P(W = W) and P(W < W) I found W(1) = W(2) as 1/n...

• Replies: 10
• Views: 6,860
10-12-2010, 08:08 PM
31. Game-show probability

A person is playing in a game show where is wins money for giving correct answers(similar to Who Wants to be a Millionaire). The person has won...

• Replies: 10
• Views: 5,037
11-13-2010, 04:44 AM
32. Stats help Urgent!!

Hello, I have an assignment due tomorrow and i can't seem to figure out this question. Question 1: Carlinville, Illinois, has just started an...

• Replies: 10
• Views: 2,804
12-02-2014, 11:53 PM
33. Choosing alpha for Pearson's correlations

Does anyone know of any good references that discuss how to choose alpha for a Pearson's correlation?

• Replies: 10
• Views: 1,838
12-09-2014, 04:48 PM
34. Is there a way to convert relative risk to cohen's d or odd's ratios?

So I only have RR but no counts. For a meta-analysis these need to be put on a common metric with other results which all use cohen's d. Hence the...

• Replies: 10
• Views: 3,661
01-30-2015, 05:42 PM
35. Statistical Difference vs. Norm

Hello, I would appreciate your help with something. I have a study to test an advertisement of n=150. The results are given as percentages for...

• Replies: 10
• Views: 2,307
03-14-2015, 04:35 PM
36. Welch t-test?

Several years ago, with the help of some experts in statistics, I selected the Welch t-test for an experiment of mine. I'm now reviewing that...

• Replies: 10
• Views: 3,895
05-11-2015, 01:43 AM
37. How to plot binary on scatter?

Ok, so forgive me for my ignorance in some areas of statistics but I am working with a binary output of: 0 and 1. I am also working with a kNN...

• Replies: 10
• Views: 1,838
07-06-2015, 07:57 AM
38. linear probability models: heteroscedasticity

I have to run linear probability models rather than logistic regression models (dichotomous endogenous variable) and I am wanting to look for a way...

• Replies: 10
• Views: 4,440
10-02-2015, 01:01 AM
39. Create lognormal from a normal distribution

Hello All, For a research I am doing I have a source that says that the range is 120 seconds to 1260 seconds, and that the mean is 356. Also, that...

• Replies: 10
• Views: 2,086
11-24-2015, 05:34 PM
40. Bootstrap Approach for Effect Size 95% Percentile Interval for Non-parametric Stat

I am trying to get an effect size for a Wilcoxon rank sum test. There is a postulated approach of dividing the z-score from the normalization of test...

• Replies: 10
• Views: 1,791
04-07-2016, 01:11 PM
41. Help with Correlation

Hello! I need help for an issue i have. Let's assume that we have data of two variables (X and Y) for 14 different people. We can find the...

• Replies: 10
• Views: 1,629
09-21-2016, 06:26 PM
42. Some IVs are normally distributed but some aren't, how to deal with it?

Hi there, In my study I had two groups of people (depressed patient vs. healthy control) and I compared their neural physiologic activity (EEG...

• Replies: 10
• Views: 2,628
02-24-2017, 01:17 PM
43. Establishing Causality

Hi All, I'm new to this forum and have a very basic question. How do we establish causality after establishing association? Do we have any...

• Replies: 10
• Views: 1,309
06-08-2017, 02:27 PM

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