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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: 197,097
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: 66,925
09-30-2005, 09:44 AM
1. ### sequencing in m-balls and n-bins

Hi, I'm doing my graduate study in computer science and I faced the following question in my thesis. suppose there are n bins and m balls. we...

• Replies: 4
• Views: 2,913
01-14-2015, 03:19 PM
2. ### Average based on Factor Analysis loadins

I am interested in creating a new variable that is made up of the factors suggested from a Factor Analysis. However, the factor is made up of both...

• Replies: 1
• Views: 2,317
01-14-2015, 11:30 AM
3. ### Contingency Table Disaster

• Replies: 3
• Views: 1,977
01-14-2015, 11:22 AM
4. ### Best test to correlate 3 groups with multiple variables

Hello, I have three groups of patients (different diseases) and for each of these patients I have some (up to 4) clinical/psychological datas (some...

• Replies: 3
• Views: 2,373
01-13-2015, 12:59 PM
5. ### Average of grading in relation to total sample size

Hello all, Lets say I'm grading translation quality of 2 different translators, and want to see their average performances. Below is the current...

• Replies: 2
• Views: 1,409
01-13-2015, 09:37 AM
6. ### Test effect of a variable on paired data

Dear forum readers, I would like to test an effect of a variable on numerical data (same as I would do with t-test or Mann-Whitney U test) but with...

• Replies: 6
• Views: 2,100
01-11-2015, 04:55 PM
7. ### Research project data analysis

Hello, I am a final year college Speech and Language student working on the research proposal for my final year project. I won't go into details...

• Replies: 1
• Views: 1,056
01-11-2015, 04:07 PM
8. ### Should I split my sample?

For my master thesis I have conducted a survey with Likert-scales. But now I'm sure which test to use to verify or falsify my hypotheses. For...

• Replies: 1
• Views: 999
01-11-2015, 02:21 AM
9. ### Application of Multivariate Analysis

The following situation is proven valuable where multivariate analysis can be applied. This example is taken from the book `Applied Multivariate...

• Replies: 0
• Views: 2,340
01-09-2015, 08:10 AM
10. ### Stata Help - Regression Interactions.

Hi everyone, I am currently doing some work on Stata. I have to interact two variables, and I am unsure of a few things - I have made several...

• Replies: 2
• Views: 1,397
01-08-2015, 10:34 PM
11. ### Covariance of two random variables

I wanted to ask can someone explain to me how to prove this implication: If Y is a random variable that has finite second moments and distribution...

• Replies: 1
• Views: 1,242
01-08-2015, 09:13 AM
12. ### Master Thesis research Proposal questions

I have no idea how this works so I'll just post my questions ^^. What is meant by "validation study"? The way I understand this is to first check...

• Replies: 0
• Views: 1,284
01-07-2015, 10:59 PM
13. ### Standard Error of the Measurement vs Method Error

Test-retest reliability studies often use measures of response stability (SEM, ME, CV, etc) to quantify the reliability of testing. SEM =...

• Replies: 1
• Views: 868
01-07-2015, 04:04 PM
14. ### Statistics question help!!

Hi All, I am new to this forum and seeking some help from you all. I am trying to solve this question to prepare for exam. I would need your help. ...

• Replies: 0
• Views: 1,479
01-07-2015, 03:35 PM
15. ### How to check whethere there is a difference between 5 samples means

I have five samples with their means (60, 58, 61.5, 48 and 42) and standard deviations (1, 3, 1.5, 4 and 2) for 3 trials. How to check whether there...

• Replies: 1
• Views: 929
01-07-2015, 08:38 AM
16. ### Calculate optimal sample size (for surveys YES/NO)

Hello, I'd like to calculate the optimal sample size for a survey, where the answers are just YES/NO. I found some tool on the internet, which do...

• Replies: 0
• Views: 1,727
01-06-2015, 01:58 PM
17. ### Turning a continuous and an ordinal variable into one measure?

Hi, In my research I've measured a certain construct in two ways. I'd like to combine both measures so I can have one variable I can use in...

• Replies: 1
• Views: 1,191
01-06-2015, 01:51 PM
18. ### Absence of interaction, but different patterns of simple main effects

Hi, I'm using linear mixed models in SPSS to analyze the Reaction Time (RT) data for my first psycholinguistic study. I have two fixed variables...

• Replies: 0
• Views: 976
01-06-2015, 12:07 PM
19. ### calculating Z for Box-Cox

Hello, I'm a bit rusty with my maths and trying to recall how to calculate Z for a box-cox distribution (LMS). For a given LMS how do I get the Z...

• Replies: 0
• Views: 1,727
01-03-2015, 02:49 PM
20. ### Creating a index variable/metric from a concept

I am seeking help in deriving/designing an index variable/metric based on the concept below. I am trying to create a variable that measures...

• Replies: 0
• Views: 1,338
01-03-2015, 02:13 PM
21. ### SPSS output problem

Hello, I'm doing a university assignment where we've received a certain SPSS output and we have to write a report on it (including results...

• Replies: 2
• Views: 1,242
01-03-2015, 05:18 AM
22. ### one sample median test for a Likert item?

Today I was trying to figure out which test would be appropriate if you have an ordinal variable and want to test if the median could be equal to a...

• Replies: 1
• Views: 1,702
01-02-2015, 08:45 AM
23. ### R code

How does the code in R work? Why does it take 3 values? 0:2/5 0.0 0.2 0.4

• Replies: 1
• Views: 1,233
01-02-2015, 08:28 AM
24. ### How to prove random sample is out of known population?

Hi! I hope this is the correct board to discuss this kind of problem. I have some random samples and a known population. Problem is some of the...

• Replies: 2
• Views: 1,464
01-01-2015, 09:55 PM
25. ### Pop corn vs Chocolate. Which statistical test?

Hello all. I have a couple of questions regarding what statistical tests to use for a three-part problem. I would very much appreciate any help....

• Replies: 37
• Views: 7,113
01-01-2015, 02:57 PM
26. ### Chi-Square or Binomial? Data is counts of observations and lots of zeros. Solution?

Hi, I have done a behavioural study on four fish to determine their sex. I paired the fish together so they were introduced to all others in turn...

• Replies: 1
• Views: 1,668
12-31-2014, 07:58 AM
27. ### Help with GLM

Hi everyone, This is the first time I am posting here, but hopefully you can help! I am running a GLM in SPSS on a data set on owl survey...

• Replies: 1
• Views: 1,294
12-31-2014, 07:54 AM
28. ### Meta-analysis of group contrasts

I'm looking at a meta-analysis of randomized trials that consist of comparing two treatments for a disorder (i.e., behavioral treatment versus a...

• Replies: 0
• Views: 1,242
12-30-2014, 02:08 PM
29. ### Hypothesis Test for multiple options rankining question

O.k I got it

• Replies: 0
• Views: 2,024
RCS
12-30-2014, 10:52 AM
30. ### Significance between multiple groups

Hi Guys, I have an okay understanding of statistics but struggled with this one as it is not something I have done before, any help or pointers...

• Replies: 1
• Views: 1,086
12-30-2014, 08:58 AM
31. ### Which statistical analysis should be used?

Hello everyone I have seven localities from which I collected different species of plants (small number of species aout 30) I want to include some...

• Replies: 4
• Views: 1,962
12-29-2014, 10:18 AM
32. ### Guidance with a random variable problem needed

Hello. So I have been trying to solve this problem on my statistics course and I'm having a lot of trouble: "In BME Bioinstrumentation lab, each...

• Replies: 2
• Views: 2,064
12-29-2014, 04:57 AM
33. ### Using Chi-square test for testing correlation between more than two variables

Hi, I don't have deep knowledge in statistic, and I have been googling for an answer to my question, but i got no luck. Hopefully i found an answer...

• Replies: 2
• Views: 2,619
12-28-2014, 05:23 PM

So far, I know how to do single and multi-variable regression in Excel, in order to generate an equation that can be used to calculated expected...

• Replies: 1
• Views: 1,496
12-27-2014, 10:46 PM
35. ### Stream temperature over time: is a repeated measures ANOVA my best bet?

I am trying to analyze temperature data across 5 sites taken over approximately 4 months and am having trouble working out the best test to use (I'm...

• Replies: 3
• Views: 2,702
12-27-2014, 10:22 AM
36. ### Multivariate techniques on overlapping data?

Hello, I am involved in a study where the DV is performance on a word recall test (#words recalled out of 10), and we are comparing 2 groups of...

• Replies: 1
• Views: 1,056
12-25-2014, 09:33 PM
37. ### Excel formula for the inverse Pearson IV distribution?

Hello Everyone, What is the excel formula to generate the inverse Pearson IV distribution? I have mean, standard deviation, skew and kurtosis and...

• Replies: 7
• Views: 4,147
12-24-2014, 07:20 PM
38. ### How can I compare variability of data before & after an intervention within a subject

Hi, I'm trying to analyse some patient data I've collected. Basically, I've got beat by beat heart rate readings before and after an...

• Replies: 4
• Views: 1,386
12-24-2014, 06:49 AM
39. ### Post-hoc after ANOVA < 0.05

Working on tests for some survey questions for a dissertation. I am able to reject one Hypothesis with a 0.042 One way ANOVA. I have 5 groups in...

• Replies: 16
• Views: 4,141
12-23-2014, 06:49 PM
40. ### McNemar test and all the variations, is mid-p indeed the best?

After a long search I think I finally got this right, but would like to know for sure. I've been trying to sort out all the variations on the McNemar...

• Replies: 1
• Views: 2,437
12-23-2014, 11:11 AM
41. ### What statistical method to use in SPSS?

Hello everybody here, l am new in staitistics, and l am working on an assignment to test volunteering behaviour of people in Country 1. I am...

• Replies: 1
• Views: 1,416
12-23-2014, 10:08 AM
42. ### ARMA one step ahead forecast and forecast error

For a ARMA(1,1) process with constant \theta is X_t=\alpha X_{t-1}+\theta +Z_t+\beta Z_{t-1} where Z_T is white noise with mean 0 and...

• Replies: 0
• Views: 959
12-23-2014, 07:15 AM
43. ### Comparing primary and secondary data?

Hi! I am writing scientific paper about franchising in Serbia and USA. I will have primary data for Serbia (questionaire) and secondary data for USA...

• Replies: 1
• Views: 983
12-22-2014, 08:29 PM
44. ### Non-parametric repeated measures guidance needed

What I am studdying is Aspergillosis (a disease) -it is caused by the terrestrial soil fungus called Aspergillus sydowii - of the sea fan Gorgonia...

• Replies: 0
• Views: 1,429
12-22-2014, 07:46 PM
45. ### Gamma expectation

Hi, I need to find the expection of 1/Y where Y is distributed by Gamma with parameters \alpha and y. Do I need to find the pdf of 1/Y by using...

• Replies: 1
• Views: 1,128
12-21-2014, 10:50 PM
46. ### Predicting the increase/decrease of number

I have these entries in my database that looks like this: ItemID Coefficient Time 14 1.74 "2014-12-21 17:13:29" 14 1.73 ...

• Replies: 0
• Views: 1,290
12-21-2014, 12:13 PM
47. ### Loglinear Analysis

Hi, I work in a university and am trying to analyse a dataset that contains data for a number of years on whether students perform sufficiently...

• Replies: 0
• Views: 1,099
12-20-2014, 10:05 AM
48. ### Basic Measurement Error when calculating the Mean

Hi all, I have a question about measurement error and how it can play a role when calulating the error of the mean. I have an automated process...

• Replies: 6
• Views: 1,858
12-19-2014, 12:12 PM
49. ### What's the phenomenon when something is less likely to occur as time goes on?

Let's say my friend says "I'll probably call you today". It's 8am. There's some % chance of him calling before 5pm. Let's say that's X%. So...

• Replies: 1
• Views: 1,250
12-19-2014, 11:55 AM
50. ### Calculating effect size when there are multiple outcomes

Hi, I'm trying to work the effect size for a study in which there are several outcomes for the same intervention. The intervention is a strength...

• Replies: 1
• Views: 1,126
12-19-2014, 04:57 AM

Hello, I am calculating an attendance factor by dividing the average daily attendance by the highest single daily attendance occurrence. eg. ...

• Replies: 2
• Views: 1,982
12-18-2014, 06:18 PM
52. ### method/metric of comparing two random samples and their impact

Hello I have the following problem - given a set S of N=100000 data elements I need to extract a random sample R of size n=20 and then for each...

• Replies: 0
• Views: 1,102
12-18-2014, 09:45 AM
53. ### Basic question: is the std of complex numbers the std of its components?

Sorry for the basic question, I searched the internet but could not get a simple and clear answer. Application: I want to compute the std of a...

• Replies: 1
• Views: 1,194
12-17-2014, 05:19 PM
54. ### Changing a target value that minimize the product being outside the specifications in

I was doing problems in the article here. http://elearning.vtu.ac.in/10/enotes/06IPIM65/Mod10-NVN.pdf In the question on page 16

• Replies: 0
• Views: 1,559
12-17-2014, 06:52 AM
55. ### Finding ciritical W Values for Shapiro Wilk Test

Hey, my first post here =) First off all, english is not my first language, so it is difficult for me to translate the scientific terms into...

• Replies: 0
• Views: 1,174
12-17-2014, 06:31 AM
56. ### Analysis of possible variables causing incorrect test results (false-positive etc)

Dear geniuses, Thank you in advance to hearing my plea. First off, I'm new to the world of statistics, so if possible please keep it plain and...

• Replies: 3
• Views: 1,227
12-16-2014, 04:16 PM
57. ### Comparing regression equations

Hello! I have a question about how to compare regression equations and regression coefficients. I have data set A with n data points, and two...

• Replies: 0
• Views: 1,201
12-16-2014, 03:28 PM

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