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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: 196,686
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: 66,710
09-30-2005, 09:44 AM
1. ### Need way to statistic puzzle

Hello guys i need help with statistic problem. The problem is : In room have 3 doors, one door is exit from room (o minutes) , second is return us...

• Replies: 0
• Views: 892
10-15-2015, 11:28 AM
2. ### PCA or clustering on binary data?

Hello, I have a dataset consisting of around 30 species of plants (rows) and around 50 variables (my columns) that are medicinal properties of...

• Replies: 14
• Views: 3,148
10-15-2015, 10:55 AM
3. ### Covariance of Time Series

Could someone explain if this is the right way to do it? Thank you! https://goo.gl/photos/ykmodDUj7RVKcS4W9

• Replies: 0
• Views: 833
10-14-2015, 07:53 AM
4. ### Chi-square appropriate for my data? What else can I do?

Hello friends. I'm taking my first statistics class, and this is my first post here, so thank you for having me. I'm writing an apa style paper...

• Replies: 0
• Views: 1,398
10-13-2015, 04:36 PM
5. ### Which statistical test?

I am returning to statistics after a gap of a few years, I was never confident before and seem to be really struggling now! I was wondering if...

• Replies: 7
• Views: 1,296
10-12-2015, 12:20 PM
6. ### Test to prove if two products are same

We have a food company where we produce multiple products on the same machine. For shelf life analysis we are selecting 3 packages from each product...

• Replies: 2
• Views: 1,759
10-12-2015, 09:51 AM
7. ### Which Statistical Test?

I have been given a rather difficult scenario to interpret and based on the information, must determine the appropriate statistical test to use based...

• Replies: 3
• Views: 1,095
10-12-2015, 08:35 AM
8. ### interpreting layered chi square output

Hello, I was wondering if anyone could help with interpretation of a layered chi square table to look for a confounding variable I am getting...

• Replies: 9
• Views: 2,321
10-12-2015, 04:37 AM
9. ### Covariance same as standard score and raw score?

I have a problem in which we have to compute the correlation coefficient, using the standard score formula, covariance formula, and the raw score...

• Replies: 0
• Views: 1,620
10-11-2015, 03:24 PM
10. ### Cramers V after Chi square test

Hi, I was told to use a Chi square test with Cramers V. Do I only use Cramers V as a post-test if the Chi square test is significant? Thank you!

• Replies: 6
• Views: 1,921
10-11-2015, 09:28 AM
11. ### Normal Distribution, probability of a certain value

Hi, does anyone know how to do this question? I am really struggling... I know how to find the probability of someone coming within 8 minutes of...

• Replies: 1
• Views: 1,845
10-11-2015, 07:07 AM
12. ### Analysis of residues

Let Y_i the observed values \hat{Y_i} the fitted values and e_i the residues, for i=1,2,3,4,5. Then we have Y=(35,17,42,28,53) and...

• Replies: 1
• Views: 2,082
10-11-2015, 06:56 AM
13. ### PASW scatterplot

http://imgur.com/GldQa3Y This looks to me like a negative correlation, but how do I justify it in the answers...? c doesn't seem to make...

• Replies: 1
• Views: 1,316
10-11-2015, 02:33 AM
14. ### SPSS interpretation

Is the answer to this (http://imgur.com/GldQa3Y) a? I am extremely confused... What does sig(2 tailed) mean...? Thanks :)

• Replies: 0
• Views: 1,070
10-10-2015, 09:06 PM
15. ### Full and reduced model in linear Regression

The normal error regression model is Y_i=B_0+B_1X_i+\epsilon_i where \epsilon_i\sim N(0,\sigma^2) and the reduced model is Y_i=B_0+\epsilon_i . I...

• Replies: 1
• Views: 3,390
10-10-2015, 07:09 PM
16. ### Median and quartiles

Hello dear mates; WHY the value of median and quartiles are non-unique ? thank you

• Replies: 2
• Views: 1,319
10-09-2015, 03:13 PM
17. ### ANCOVA and stratified sample

Hello folks! I want to measure the effect of an intervention (dummy variable) on a continuous variable in a controlled intervention trial. I...

• Replies: 2
• Views: 2,541
10-09-2015, 10:50 AM
18. ### P Stat Help

I'm having a hard time understanding the calculation of the P stat. I simply have a sample where the expected outcome is 50/50. In this case, 81 of...

• Replies: 2
• Views: 1,466
10-09-2015, 10:16 AM
19. ### Comparing 2 Means with STDev and Sample Size

Hi there, I am trying to compare the means of 2 independent samples to determine if there is a difference between them or not. I have the mean,...

• Replies: 1
• Views: 1,078
10-09-2015, 06:41 AM
20. ### Regression model with normal error

In a small-scale regression study, five observations on Y were obtained corresponding to X = 1,4,10, 11, and 14. Assume that \sigma=0.6,B_0=5,B_1=3...

• Replies: 6
• Views: 1,714
10-09-2015, 01:05 AM
21. ### Standard Deviaton/Unusual (ScreenShot Included)

I dont understand how this is wrong? I need help, I have sat here looking over it for an hour

• Replies: 0
• Views: 1,077
10-08-2015, 04:20 PM
22. ### What is the proper test to use for this study?

It's been too long since I have taken a stats course, and I'm struggling to figure out what the proper test is for this experiment I'm designing. ...

• Replies: 0
• Views: 1,491
10-08-2015, 04:19 PM
23. ### Determine sample size and frequency for long term permanent monitoring monitoring

Hello, I have five years of annual plant count census data from 214 permanent sampling plots. These are complete counts of a single plant species...

• Replies: 0
• Views: 1,019
10-08-2015, 03:20 PM
24. ### Clustering - Average Linking method

Dear community, currently, I am spending my time with the average linking method but actually I don't really understand it. I know HOW to link the...

• Replies: 1
• Views: 1,066
10-08-2015, 12:36 PM
25. ### Estimating Failure Rate: Chi-Square v Poisson

I understand Poisson distribution is for discrete events and can be used to estimate failure rate to a given confidence level from elapsed time and...

• Replies: 0
• Views: 1,038
10-08-2015, 10:35 AM
26. ### Statistical Test - Which one

Hello everyone, I want to make one analysis to understand the behaviour of some stores: if there are some similars, which one are similars, etc. ...

• Replies: 0
• Views: 883
10-08-2015, 09:28 AM
27. ### Ratio of Means - appropriate test for single or multiple comparisons? Fieller's CI?

I would really appreciate any suggestions with the following data analysis issue. Please read till the end as the problem at first may appear...

• Replies: 8
• Views: 2,462
10-07-2015, 12:25 PM
28. ### Joint Distribution

Hi everyone, I've got a problem with a joint probability density function question. Given f(x, y) = e^-(x+y), 0 <= x < ∞ , 0 <= y < ∞ , and...

• Replies: 0
• Views: 932
10-07-2015, 01:48 AM
29. ### z-score within participants before or after averaging conditions

Hi, I have a Group(2) x Condition(5) ANOVA design. Group is a between factor and Condition is within. I'm specifically interested in interaction...

• Replies: 0
• Views: 887
10-06-2015, 08:40 PM
30. ### ANCOVA with more than 2 covariates. homogeneity of regression slopes.

Hello, I am carrying out a ANCOVA with more than 2 covariates with SPSS. I want to check the homogeneity of regression slopes to confirm the...

• Replies: 2
• Views: 1,516
10-06-2015, 08:16 PM
31. ### Econometrics Questions Help PLEASE

I am having a hard time with proofs in econometrics (as i think alot do) but I would really appreciate some help into these questions 1) y= Bo +...

• Replies: 7
• Views: 1,950
10-05-2015, 12:57 PM
32. ### Is Kruskal Wallis really needed?

Dear all, I really do not see why we need Kruskal-Wallis test at all. In terms of the distribution, only platykurtic distribution may increase...

• Replies: 2
• Views: 1,750
10-05-2015, 08:36 AM
33. ### How to calculate sample size using spss

I want to calaculate sample size of 150 population using SPSS. Please explain

• Replies: 0
• Views: 866
10-05-2015, 05:11 AM
34. ### Probability Question

Hello, So I have a question that I thought I did right but in reality, was wrong. The question goes as followed: Suppose I give you a list of 20...

• Replies: 3
• Views: 2,521
BGM
10-05-2015, 03:38 AM
35. ### Filtering hostility from survey

This is not directly related to statistics, but is a problem that stops one from getting good statistics. And pprobably every single person who works...

• Replies: 2
• Views: 1,488
10-05-2015, 01:26 AM
36. ### Finding relationships between 3 or more variables?

Hello, Total newbie here - but I'm hoping someone can help me out. I have finished running a multiple regression analysis and have my results....

• Replies: 0
• Views: 1,757
Tzo
10-04-2015, 03:33 PM
37. ### Sign Test Problem how to solve?

A physical instructor claims that a particular exercise when done continuously for 7 days,reduces body weight at least by 3.5kg. Five overweight...

• Replies: 4
• Views: 1,972
10-04-2015, 01:49 AM
38. ### Correct SD for between-groups Cohens d, when variable is a difference between means

Hi all, Im working on a meta-analysis using effect sizes, and trying to integrate other researcher's data. I have a question I am hoping to clarify,...

• Replies: 0
• Views: 949
10-03-2015, 02:08 AM
39. ### Needing help for the correct statistics to use...

Hi, all! I am a newbie to this site and am super limited on my stats knowledge. I have a project that is being done that requires statistical...

• Replies: 4
• Views: 1,774
10-02-2015, 04:14 PM
40. ### Pre-requisites for learning R

Hi experts, So i recently started learning R but looks like its tough for me. Are there any essential languages to learn before jumping into the R....

• Replies: 2
• Views: 1,313
10-02-2015, 10:22 AM
41. ### Chi-square test. 87,5% have expected count less than 5

Hi, 4x4 table. What should I do when over 20 % of the cells have expected count less that 5? What other statistic analyse is recomended?...

• Replies: 2
• Views: 1,056
10-02-2015, 08:40 AM
42. ### How to compare percentages?

I have no experience in statistics whatsoever and would really appreciate some help with how to compare percentages. I have a patient group (n77) and...

• Replies: 2
• Views: 1,769
10-02-2015, 02:37 AM
43. ### 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: 4,409
10-02-2015, 01:01 AM
44. ### Time Series (Random Walk?)

I just recently started to learn about moving average process of order 1, however, I get confused if there are other things attached to the equation....

• Replies: 0
• Views: 1,072
09-30-2015, 11:48 AM
45. ### Time Series (White Noise)

Suppose W_t and Y_t are two independent normal white noise series with Var(W_t)=2Var(Y_t)=4. Let X_t = W_t-0.5W_{t-1} and...

• Replies: 0
• Views: 1,775
09-30-2015, 11:43 AM
46. ### Hypothesis test for a Proportion

The Digital New Zealand 2014 report also reports on a survey into who is playing games in New Zealand. The survey collected data from 2,377...

• Replies: 1
• Views: 1,101
09-30-2015, 08:16 AM
47. ### Control Chart help - Determining if it's in control or not

Hello all. I need help for this assignment. Here I have 3 different control charts. My assignment is to determine if they are in statistical control...

• Replies: 1
• Views: 1,133
09-30-2015, 06:39 AM
48. ### Create new variable in R dataframe by counting values equal to or greater than 1

Hi, I have a dataframe in which I need to create a new column by counting all values equal to or greater than 1 occurring row-wise. I tried to use...

• Replies: 1
• Views: 1,417
09-29-2015, 08:11 PM
49. ### Negative Binomial Panel Regression Model cannot be fitted

Hello everybody, I have a question: one of the negative binomial panel regression models I'm trying to calculate cannot be fitted - using Stata...

• Replies: 0
• Views: 1,297
09-28-2015, 01:04 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: 2,190
09-26-2015, 04:30 PM
51. ### Confidence limits on occupant satisfaction in buildings

Apologies to all if this is a chestnut of a question, but I've just joined TalkStats. Question: what is an appropriate confidence limit to apply...

• Replies: 0
• Views: 796
09-25-2015, 10:54 AM
52. ### 6 Widget Producing Machines - How often one machine produces the most/above average

I'm looking to be able to calculate (not simulate) how often a sample from one distribution exceeds the sample of multiple other distributions. I am...

• Replies: 3
• Views: 1,515
09-24-2015, 11:33 AM
53. ### Repeated t-tests or ANOVA for discerning difference between two treatments

Hello, I am helping my sister with some statistics in her master's dissertation in behavorial/social sciences. I have studied a couple of courses...

• Replies: 0
• Views: 983
09-24-2015, 09:51 AM

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