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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: 196,569
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: 66,624
09-30-2005, 09:44 AM
1. ### Assignment help

Delete thread please

• Replies: 0
• Views: 943
04-11-2013, 11:37 AM
2. ### Urgent help

I have 30 participants and 45 test items. The test items were divided into low, mid, and high frequencies. I want to investigate if there is a...

• Replies: 4
• Views: 1,180
04-11-2013, 10:51 AM
3. ### statistics

A study was conducted with children in Year 1, 2 and 3 of primary. Twenty Year 1, 20 Year 2 and 20 Year 3 children took maths and science tests. The...

• Replies: 3
• Views: 1,294
04-11-2013, 10:14 AM
4. ### nonparametric equivalent for 2x2 between subjects ANOVA

Dear Forum Members, I am looking for a nonparametric equivalent of 2x2 between subjects ANOVA. The dependent variable is ordinal and negatively...

• Replies: 5
• Views: 3,191
04-11-2013, 09:23 AM
5. ### Population Growth

First of all this is not for homework. I had a stupid thought and wanted to test something. I started thinking if over 50 years for ever 2 people...

• Replies: 0
• Views: 844
04-11-2013, 09:13 AM
6. ### Question About Degree Of Freedom

I know it's used for the T-interval but I have a question. Even if the sample is for example 547, would I do 547-1? For the degree of freedom when...

• Replies: 1
• Views: 1,116
PSG
04-11-2013, 12:11 AM
7. ### Is this correct?- Kriskal Wallis Test

I want to compare multiple groups pre-intervention and post-intervention, to see which intervention was the most effective. So I calculated the...

• Replies: 1
• Views: 1,294
04-10-2013, 09:19 PM
8. ### Method of Moments

Question: Let X1, X2, ... , Xn be a random sample of size n from a population with pdf f(x;theta) = / (theta)^3 from 0 < x < theta and zero...

• Replies: 0
• Views: 1,218
04-10-2013, 09:00 PM
9. ### Dealing with Zero Values in a G-test

Hello, I am dealing with some zero values which are not valid in a G-test. Is it appropriate to substitute zero with a 0.000001 for example? I...

• Replies: 0
• Views: 1,383
04-10-2013, 08:59 PM
10. ### Some Help Please

In A Random Sample of 678 ADULT MALES 20 TO 34 Years of age, it was deermined that 58 of them have hypertension. Part C- You wish to conduct...

• Replies: 2
• Views: 2,623
PSG
04-10-2013, 06:10 PM
11. ### Multilevel models help

I am in a situation where I have an outcome variable (dichotomous) that has been measured in different centers (group variable). Here it is a...

• Replies: 3
• Views: 1,326
04-10-2013, 04:07 PM
12. ### Significance Testing of Fourier Transform

Hi everyone- I am doing vibration analysis of a device and have collected data via an accelerometer. I do a fourier transform to get my data into the...

• Replies: 0
• Views: 1,190
04-10-2013, 08:10 AM
13. ### Liklyhood with small varince in Bayisan

We are trying to set up a Bayesian problem, but the problem we think there is we have a likelihood where the covariance, given by the data set, is...

• Replies: 1
• Views: 1,415
04-10-2013, 07:44 AM
14. ### Homework Help

2. For ten years from 1992 to 2001 A.J.Jones has kept a record of several variables. Here are his data on the average gasoline price in cents per...

• Replies: 1
• Views: 1,364
04-10-2013, 02:49 AM
15. ### Advice/help

Hi all first post from a complete statistics-phobe, I'm just looking for a little advice pointing in the right direction. I'm a first year teacher...

• Replies: 2
• Views: 1,291
04-09-2013, 04:40 PM
16. ### leveraging logistic results

Here are the results of a logistic regression Number of Observations Used 97091 Response Profile Ordered Value buy Total Frequency...

• Replies: 0
• Views: 1,309
04-09-2013, 04:23 PM
17. ### Comparing means on different measurement scales?

I'll try my best to keep this as clear as possible. I have two groups of people divided according to age: teenagers and pensioners. I want to...

• Replies: 1
• Views: 3,110
04-09-2013, 10:39 AM
18. ### Using SPSS to calculate P value? How to do it?

I'm using the SPSS software, and I have been given two columns of data e.g. one column for weight and the other for height how would I go about...

• Replies: 1
• Views: 9,597
04-09-2013, 09:54 AM
19. ### 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: 3,254
04-08-2013, 07:14 PM
20. ### Simulating with or without subgroups?

Hi! I'm trying to do some basic monte carlo. I've seen two ways of going about it, and I'm not sure if one has particular benefits. I'm also...

• Replies: 0
• Views: 987
04-08-2013, 03:16 PM
21. ### Updating covariance matrix when more info becomes available.

Say, I have a solution to a 3D problem in the form of a a triple (x0,y0,z0) with uncertainty specified by an error covariance matrix S. Using these...

• Replies: 0
• Views: 1,105
04-08-2013, 02:55 PM
22. ### Chi-squared test for multiple samples?

I have a problem that I can't seem to find an answer to in my statistics books or via Google, so I thought you guys might be able to help. I have...

• Replies: 6
• Views: 12,606
04-08-2013, 01:50 PM
23. ### How do I arrive at a winner from this?

Hi Guys, I've been asked to do a poll/rating system for some local site that reviews restaurants. We'll be using those 5 stars you can click on...

• Replies: 0
• Views: 1,623
04-08-2013, 01:15 AM
24. ### Model for two way table

Suppose you have data in the following format: <60 60-69 70-79 80-89 90-99 No Exercise 5 10 2 4 1 Moderate ...

• Replies: 0
• Views: 1,301
04-08-2013, 12:58 AM
25. ### Best Way To Tell The Difference From T and Z intervals

Okay, both steps are basically the same, I got the formulas. But what is the best way to tell which is which? I know it is the STD is known(sigma...

• Replies: 1
• Views: 1,259
04-07-2013, 11:58 PM
26. ### Variance

I have a question, can't figure out how to do it, tried several things... to the numbers 0 and 2, you need to join a third number, such that the...

• Replies: 2
• Views: 1,382
BGM
04-07-2013, 01:59 PM
27. ### How do I measure 'escalation' or 'shortening intervals' in data?

Hi there, Not sure I'm phrasing my question correctly in the thread title.........so I'll briefly explain. I have a dataset of rail signal point...

• Replies: 4
• Views: 1,294
04-07-2013, 01:01 PM
28. ### Discrete uniform distribution - completeness

I am working on the following problem. Suppose that X_{1},...,X_{n} IID X where X~Unif{1,...,\theta}, \theta \in \mathbb{N}. Let...

• Replies: 3
• Views: 3,242
BGM
04-07-2013, 12:16 PM
29. ### Correlation coefficient of X Y,Z

the correlation coefficient of X Y is 0.6, and the correlation coefficient of Y Z is 0.7, what is the range of the correlation coefficient of X and...

• Replies: 4
• Views: 1,987
04-07-2013, 10:34 AM
30. ### Help with Stats Assignment

I posted this in the Psych Stats area, but thought it might be better here ... any help or advice is greatly appreciated I came across this forum...

• Replies: 0
• Views: 876
04-06-2013, 10:17 PM
31. ### practice problems on linear model topics

Hi, I am a first year stats grad student and I am taking a class on linear models. The book and lectures focus on definitions and proofs....

• Replies: 0
• Views: 842
04-06-2013, 08:30 PM
32. ### Normal Distribution.. need calc/learning HELP!

can someone teach me how to use my ti-84 plus calculator to find each step? id greatly appreciate it. thanks!

• Replies: 2
• Views: 1,579
04-06-2013, 03:02 PM
33. ### Please help with Homework: Hypothesis Testing with Multivariable Regression

Hi, I stumbled upon this forum upon a Google Search while trying to get help with my homework. I hope I can get help here; I have been stuck for...

• Replies: 0
• Views: 1,131
04-06-2013, 03:34 AM
34. ### If two variables have the same effect on the dependent variable

Hi I don't need a long explanation just enough to point me to the right direction to solving my question. The question is: Determine if income...

• Replies: 0
• Views: 2,141
04-06-2013, 12:25 AM
35. ### How to interpret a standardized multiple regression coefficient

How can I write an interpretation of the standardized multiple regression equation for both Age of Child and Number of Siblings in this model: ...

• Replies: 4
• Views: 36,454
04-05-2013, 09:34 PM
36. ### How do I calculate this enormous P-value?

Hello, I have the following data and want to perform a Poisson dispersion test. ...

• Replies: 2
• Views: 2,074
04-05-2013, 04:28 PM
37. ### how to know when to square a variable in an MLS

in a multiple linear regression, I notice that occasionally a variable will appear as it is, and also as a squared version of itself. This is...

• Replies: 0
• Views: 991
04-05-2013, 03:30 PM
38. ### 2 Sample T Test for Nonnormal data

Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

• Replies: 0
• Views: 1,273
04-05-2013, 02:32 PM
39. ### reading significance values for partial correlation coefficitns

in Stata the pcorr command gives significance levels with the partial correlation coefficients between variables. How do I read these significance...

• Replies: 0
• Views: 1,412
04-05-2013, 12:49 PM
40. ### summary statistics for dummy variables

If I have a dummy variable that is 1 for true and 0 for false of a certain characteristic of a set of data, can I interpret summary statistics like...

• Replies: 0
• Views: 1,494
04-05-2013, 12:12 PM
41. ### Help: Dummy Variable Regression with two components

Here is the question: I was thinking it might look something like Y=B0+B1D+B2(X1i.D)...

• Replies: 1
• Views: 1,184
04-05-2013, 10:33 AM
42. ### Why does a larger sample size produce a smaller p-value?

Hi, I need help with this problem... The obtained p value for a correlation analysis is .036, for a sample size is 50. If the analysis had been...

• Replies: 2
• Views: 5,104
04-05-2013, 05:55 AM
43. ### Cluster analysis and statistical test

Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

• Replies: 5
• Views: 2,113
04-05-2013, 05:25 AM
44. ### Sampling design question

1.what is the difference between stratified and systematic sampling

• Replies: 0
• Views: 1,241
04-05-2013, 02:54 AM
45. ### Variance between two time series (action and feedback)

I would like to know how find the variance between two (or more) time series. I have a series of timings (in milliseconds) which represent the...

• Replies: 0
• Views: 2,242
04-05-2013, 02:32 AM
46. ### Variable transformation

Hi all, I've got a question concerning variable transformation: In many books it is recommended to use variable transformation, if your data is...

• Replies: 0
• Views: 974
04-05-2013, 02:12 AM
47. ### Potential confounding factor in study - am I analyzing this data properly?

I have conducted an experiment regarding the effects of tag size on fish survival (sample size = 90 fish), which I have simplified for ease of...

• Replies: 0
• Views: 941
04-04-2013, 09:23 PM
48. ### Zero-inflation models

Hi everyone, I've been researching these more and more due to some unusual data I have, but have a fairly overarching question I seem unable to find...

• Replies: 2
• Views: 1,362
04-04-2013, 08:25 PM
49. ### Understanding which simple effect to do and why

I've been struggling to figure out which simple effect test to do for my assignment, and most importantly why. The hypothesis is that the effect...

• Replies: 3
• Views: 1,178
04-04-2013, 07:08 PM
50. ### Question abour Anderson Darling test

Is k sample Anderson Darlıing test equavelent to Kruskal wallis test? Can I perform k sample Anderson darling test for comparing k groups instead of...

• Replies: 0
• Views: 1,292
04-04-2013, 04:00 PM
51. ### 2x3 factorial design

Hi, I need to analyse a 2x3 factorial design of an experimental group and a control group, doing 3 serial recall tests over time. so far I've used...

• Replies: 0
• Views: 2,407
04-04-2013, 01:31 PM
52. ### Will a t-test (or nonparametric equivalent) work for me?

I am trying to measure whether individual scores on a behavioural scale are statistically different from the average (median) score on that scale. ...

• Replies: 2
• Views: 1,317
04-04-2013, 11:06 AM

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