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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: 197,237
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: 67,003
09-30-2005, 09:44 AM
1. ### Someone puts Cohen's d in a nutshell, please

Hi, I came across Cohen's d statistic and I would very appreciate if anyone could provide me with a brief explanation of it and with an example...

• Replies: 7
• Views: 96,502
06-15-2013, 05:17 PM
2. ### Statistics Headache - Any help gratefully appreciated!

Hi everyone, I have spent the good part of a week scouring the internet, trying to work this out and would be so grateful if someone could help...

• Replies: 7
• Views: 1,584
04-30-2013, 10:30 AM
3. ### Comparing prices in different countries

Hi Everybody!!! I am currently writing a master's thesis in political science, about how food prices affects the outcome of conflicts. I have some...

• Replies: 7
• Views: 2,648
04-21-2013, 10:44 AM
4. ### Kolmogorov-Smirnov test

Dear all, I need to apply the Kolmogorov-Smirnov test to a set of data in order to verify if the data has a normal distribution. The data have...

• Replies: 7
• Views: 3,293
04-08-2013, 07:14 PM
5. ### Some Help, Please

Let me give you the gists of the problem. n=15 p=.65 x value=10 Okay, it's asking me that at least 10 flights are on time. Our Prof,...

• Replies: 7
• Views: 1,175
PSG
03-15-2013, 11:31 PM
6. ### 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: 1,573
03-11-2013, 05:29 AM
7. ### maximum likelihood

Hello! I would like to know if what I need to do is feasible. Given a sample x=, I would like to know the probability (the likelihood) that the...

• Replies: 7
• Views: 1,892
04-16-2013, 06:13 PM
8. ### distribution of ln(X) when X is binodal normal

Hi everyone. I am trying to find the distribution of ln(X) when i know that X is distributed as a binodal normal distribution, in other words: ...

• Replies: 7
• Views: 1,660
BGM
03-21-2013, 05:28 AM
9. ### 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: 2,211
03-05-2013, 12:00 PM
10. ### Do I use a paired t test or correlation coefficient?

I am a doctor writing a paper on the role of ultrasound in carpal tunnel syndrome. I don't have much knowledge of statistics. I have two sets of...

• Replies: 7
• Views: 2,791
05-16-2013, 09:49 AM
11. ### Meaning of a Statistically Significant Intercept

Greetings: I have been attempting to define the meaning of a statistically significant intercept in multiple regression. I have searched the Web...

• Replies: 7
• Views: 10,142
05-13-2013, 05:58 PM
12. ### compare F statistics vs P-values

Hi I have a question about comparing F statistics among effects. I have the following anova table Parameter Estimate ...

• Replies: 7
• Views: 3,245
05-24-2013, 02:36 PM
13. ### Testin Additivity

Hello everyone, does anyone know how you can test for additivity in a parametric regression model? For instance, if you have a regression model...

• Replies: 7
• Views: 1,517
05-17-2013, 02:04 PM
14. ### Normally distributed RVs

Hello. I'd like to know how can I calculate the probability that normally distributed random variables locate on the surface area on a cylinder? I...

• Replies: 7
• Views: 1,400
BGM
06-03-2013, 01:04 PM
15. ### Quasi-experimental design ignorance

Hi guys. I'm an idiot. Please help me. :-( I want to compare success rates of different interventions on two variables in multiple non-random...

• Replies: 7
• Views: 1,958
06-04-2013, 11:18 AM
16. ### A question in methodology

Good evening, I have a question about methodology, coz i do not know which way to go. For representing av results, I have used descriptive...

• Replies: 7
• Views: 1,261
06-09-2013, 04:03 AM
17. ### What impact does number of trials (as opposed to sample size) have on power of test?

Hi, I am working through some basic statistics courses online and am confused about sample size. I will try to illustrate my question with a concrete...

• Replies: 7
• Views: 2,191
10-17-2013, 05:10 PM
18. ### Gini Coefficient

I hope I have put this in the right forum. Recently, I've been trying to teach myself about measures that I'm not familiar with. One of them is the...

• Replies: 7
• Views: 2,753
07-16-2013, 01:16 PM
19. ### Sorry - another question on normality and ANOVAs - sources needed ....

Hello everyone, I have been trying to find information everywhere and would be so grateful for any help. My situation: As part of my postdoc...

• Replies: 7
• Views: 1,991
08-12-2013, 06:30 PM
20. ### How to do this hypothesis test about Bernoulli process

Hi, I'm stuck with this question about Bernoulli process. Could someone give me some clue? First define experiment A as Repeat a Bernoulli...

• Replies: 7
• Views: 2,373
06-30-2013, 06:54 PM
21. ### Create Multivariate Linear Model in Matrix Notation

Two spider species (A and B) areto be compared to see eats flies quickest. One hundred flies are released into a cage, and one spider of each...

• Replies: 7
• Views: 1,751
06-30-2013, 04:39 PM
22. ### overdispersion of binary data

Hi, I have binary data that I am testing for the significance of nesting effects. How do I determine if (or whether) the data is overdispersed?...

• Replies: 7
• Views: 4,675
08-13-2013, 03:33 PM
23. ### Which statistic to prove that one data point dominates the proportions in dataset?

I'm very new to statistics so apologies if this is a dumb question. I've got a grasp of the concepts but not real-life usage of them (but I am...

• Replies: 7
• Views: 2,849
09-02-2013, 05:19 AM
24. ### Expected value of a squared random variable

Hi Guys -newbie here. Glad to have found this buzzing community. I'm working on an econometrics course and was looking at the following problem ...

• Replies: 7
• Views: 3,974
09-06-2013, 06:28 PM
25. ### Show the two forms of the sample variance are equivalent

Show that the two forms are equivalent: \frac{1}{n-1} \sum_{i=1}^n (Y_i - \bar{Y})^2 = \frac{1}{2n(n-1)}\sum_{i=1}^n \sum_{j=1}^n (Y_i-Y_j)^2 I...

• Replies: 7
• Views: 2,434
09-12-2013, 09:07 PM
26. ### Is this a large standard deviation or small?

My data set is: 0.84, 0.47, 1.98, 4.97, 1.50, 7.64, 5.02, 2.82 Mean = 3.15 and SD= 2.5 Is this a small standard deviation or large? thank...

• Replies: 7
• Views: 3,047
10-13-2013, 01:06 PM
27. ### Confusion with inverse fallacy.

Okay, this isn't homework, this is a real modeling thing I'm having trouble with. I'm developing a system designed to develop sets for a Sunday...

• Replies: 7
• Views: 2,144
11-22-2013, 06:11 AM
28. ### Poll: Nonparametric MANOVA - is Kruskal-Wallis appropriate?

Many thanks in advance. I'm an engineer, and struggling to choose the appropriate statistical test. Here is a description of my data: I have two...

• Replies: 7
• Views: 6,196
11-23-2013, 09:28 AM
29. ### Finding the probability distribution of a dataset

Hello, I have a dataset of 100 numbers. The numbers seem to be random. I wanna find the probability distribution of the dataset. How can I do it...

• Replies: 7
• Views: 3,760
12-08-2013, 01:38 AM
30. ### Comparing means with different sample sizes

Dear all, I am new to this forum. :wave: My name is Max, I am a student at a Paris-based business school. I might need some (hopefully...

• Replies: 7
• Views: 2,490
01-22-2014, 09:56 PM
31. ### Very simple business question from a statistics simpleton

Hello Folks, I am hoping one of you can help me with a very simple, business related question. I run a business that uses a point of sale machine. ...

• Replies: 7
• Views: 2,102
Zad
12-11-2013, 11:17 AM
32. ### Help with regression analysis and 95% confidence interval

Hello! We have a couple of tasks for an assignment where we need to use regression analysis and 95% confidence interval, we're not sure on how to...

• Replies: 7
• Views: 1,580
12-26-2013, 11:37 AM
33. ### Exercise in Stationarity

Hello everyone, I am Alexandra I am completely new to the forum and have no IDEA about statistics. My boyfriend is at his final semester of his...

• Replies: 7
• Views: 1,398
02-23-2014, 11:47 AM
34. ### Inputting data with lots of variables/ which test to use?

Hi, Really hope someone can help. For my final year project i am looking at language development in twins v singletons and comparing their results...

• Replies: 7
• Views: 1,594
02-27-2014, 12:15 PM
35. ### ANOVA/Regression

Hi all, First timer here. I am hoping this is the right forum and that someone could point me in the right direction. I am analyzing a dataset...

• Replies: 7
• Views: 2,179
03-02-2014, 01:41 PM
36. ### Which analysing technique do I use?

Hi everyone! First of all sorry for my bad English, but I am Flemish. I am currently working on a paper for school, about the relationship...

• Replies: 7
• Views: 1,819
03-03-2014, 11:48 PM
37. ### The best way to analyse my data?

Hi everyone, I have been grading a set of data to receive 80 numeric values (four measurements for each of the 20 subjects). I have also got an...

• Replies: 7
• Views: 1,805
03-09-2014, 06:05 PM
38. ### What statistical analyses to use? How age influences bone density

So I have a variable, lets say Bone density in older adults. I have200+ participants ranging from 50-80 years and with its respective bone...

• Replies: 7
• Views: 9,959
03-18-2014, 03:04 AM
39. ### Appropriate analysis for Likert scale items.

Hey, everyone! Quick question regarding analysis of survey (which aims to asses women's views and attitudes towards offenders with mental health...

• Replies: 7
• Views: 2,179
03-24-2014, 02:47 PM
40. ### anyone know how to do this? im stumped.

thanks in advance.

• Replies: 7
• Views: 1,630
03-30-2014, 10:44 AM
41. ### The rationale behind bootstrap percentile interval?

When we create a confidence interval for our parameter, using a bootstrap percentile interval, , we find the empirical percentiles of the bootstrap...

• Replies: 7
• Views: 2,069
04-03-2014, 08:12 AM
42. ### Interpreting r² for non-significant results

Hi, Quick question about the interpretation of effect sizes. I was taught that (in line with APA formatting) you should always report an...

• Replies: 7
• Views: 6,059
04-21-2014, 09:02 PM
43. ### Which ANOVA? ...very stuck!

I have been looking for days now which ANOVA would be best but I am not sure which one I can use to analyse my data! Any help would be massively...

• Replies: 7
• Views: 1,346
04-24-2014, 07:03 AM
44. ### Statistical Help for Dissertation

Hi there I'm currently undertaking my dissertation. I'm dong water quality and my data is as follows: Sites 2013/14 1978 1 7.98 7.06...

• Replies: 7
• Views: 1,188
05-04-2014, 01:36 PM
45. ### Null Hypothesis

Hey, I am having troubling trying to figure out how I would write this for the null and alternative hypothesis. Any help would be appreciated ...

• Replies: 7
• Views: 2,149
05-20-2014, 09:59 PM
46. ### I need to consult your opinion! Thank you in advance!

As a newbie in statistics i need to understand what type of statistical tests to use in my research?

• Replies: 7
• Views: 3,012
05-30-2014, 05:42 PM
47. ### Dependent proportions: McNemar test although one cell is inevitably zero?

Hi everyone, I would like to compare dependent proportions. The aim is to find out whether the proportion of people who commit an error in test B...

• Replies: 7
• Views: 3,106
08-03-2014, 02:14 PM
48. ### [SOLVED] Moving average: Smoothing until stable

I am looking at a score in discourse over equally spaced intervals. Basically this is a time series. I want to view this as a line graph using the...

• Replies: 7
• Views: 3,943
06-17-2014, 01:04 AM
49. ### Use of letters to show difference between 2 groups of means ?

Hello, I hope everyone is doing well ! So, I want to ask you a question about mean comparison from statistics perspective ! well ! I have a...

• Replies: 7
• Views: 1,425
07-11-2014, 07:58 AM
50. ### [ HELP] Employees Absence

Hi everyone, I need a basic procedural help here. I have to analyze the employees absence in a manufacturing firm. I was given the data of...

• Replies: 7
• Views: 1,684
07-24-2014, 02:13 AM
51. ### Multicolinearity?

Hi, I am doing research on the importance of culture and ideology in politics. I have a dataset on Congress therefore. So, I use REP and DEM as the...

• Replies: 7
• Views: 1,783
08-18-2014, 04:10 PM
52. ### Anova related question

Hi everyone. I have a small doubt about reporting Anova result. I am examining 70 design among 40 students, so calculated the anova based on the...

• Replies: 7
• Views: 2,090
08-16-2014, 09:26 PM

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