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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: 200,289
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: 68,521
09-30-2005, 09:44 AM
1. ### Links to Useful Data

Hi, I'm new on that forum so please forgive me if I have chosen wrong category to ask my question :) Coming back to the point, as I mentioned in...

• Replies: 3
• Views: 1,635
02-05-2017, 04:25 PM
2. ### Help with OLS estimations

Hi, I have a problem I was doing OLS estimations on the data I gathered and I got strange result. I assumed that the price of house is affected by...

• Replies: 3
• Views: 1,468
02-05-2017, 12:50 PM
3. ### Meta Analysis-Scales

Hi, I am new into meta analysis and doing research on spirituality in organizations. I want to collect all scales and their results(on...

• Replies: 0
• Views: 1,096
02-05-2017, 01:09 AM
4. ### Basic high school correlation coefficient help

Question + info: http://i.imgur.com/iyBWi2i.png In question 3, the correlation coefficient I get is the exact same as in question 2... Therefore...

• Replies: 0
• Views: 1,235
02-04-2017, 05:36 AM
5. ### [SOLVED] presence absence data

I have a data set of fish presence/absence in 15 different lakes. The fish communities include the following combinations: only species A; only...

• Replies: 3
• Views: 2,642
02-04-2017, 04:03 AM
6. ### How to test baseline differences?

I have 5 different groups, each with their own range of data elements like demographics and other metrics. I was wondering if it makes sense to test...

• Replies: 7
• Views: 3,245
02-03-2017, 10:46 AM
7. ### Question about Normal Distribution and covariance between x bar and x i's

Hello. I know this is quite easy,but I forgot! If Xi's have N(a,1) and Xm be the median of this observations then what is the Cov(x bar,Xm) ??

• Replies: 0
• Views: 1,960
02-03-2017, 04:54 AM
8. ### Interaction test

I have a binary outcome and a binary independent variable, and am using an interaction test in SAS to determine whether sex (male vs female) modifies...

• Replies: 19
• Views: 5,379
02-03-2017, 03:28 AM
9. ### Correct Cross Validation. How to calculate the projected R Squared or Residual Sum Sq

Hi, I have read into the subject of finding good estimators to determine the goodness of fit when the regression on a trainingset is projected on a...

• Replies: 0
• Views: 1,802
02-01-2017, 06:11 AM
10. ### is it paired thorugh judgement

could any one help . I have an assumption of independent data . though it came from different file two different format. any expert help me is it...

• Replies: 1
• Views: 1,749
02-01-2017, 05:46 AM
11. ### Statistical design problems

Hello everyone! since I´m not the best when it comes to statistics, I hope to find some good input over here :)! I´m currently writing my...

• Replies: 0
• Views: 1,742
01-31-2017, 07:37 AM
12. ### Using statistical methods to find threshold/base line?

Hello everyone, I am a newbie to statistics and would like to seek some advice. Are there any statistical methods that can be used to determine...

• Replies: 5
• Views: 2,909
01-31-2017, 07:21 AM
13. ### probability for two replication

Suppose that a sample of size n is to be chosen randomly (without replacement) from an urn containing N balls, of which m are white and N-m are...

• Replies: 0
• Views: 1,584
01-31-2017, 03:14 AM
14. ### minimum number of data points for calculating standard error

Hi Is it valid to use only 3 data points to calculate standard error. I have seen many papers with mean and standard error calculated for a variable...

• Replies: 6
• Views: 1,938
01-30-2017, 07:47 PM
15. ### Should I use Pearson or Spearman correlation?

I have to know whether two variables are correlated or not in a sample. None of them are normally distributed, so I assumed that I should run...

• Replies: 1
• Views: 1,963
01-30-2017, 07:12 PM
16. ### Find peaks in a temporal serie

Hi ! I have several temporal series where I would like to find peaks. I mean these series are a bit noisy sometimes, with many local maximum but...

• Replies: 0
• Views: 1,850
01-30-2017, 04:31 PM
17. ### Sample Size Calculator (one group versus population)

Dear all, so far I couldn´t find a solution to calculate the required sample size for the following scenario: Goal: Research continuous...

• Replies: 2
• Views: 2,060
01-29-2017, 03:57 PM
18. ### Nice fit statistics... except for RMSEA! How can I interpret this?

Hi everyone, I have a question about a path model in which the CFI, TLI, and SRMR meet the commonly used cutoffs (i.e., over .9 for CFI & TLI;...

• Replies: 0
• Views: 1,285
01-29-2017, 01:59 PM
19. ### Help on understanding sum of independent variables(new to statistics)

Hello everybody. Im new to stat. Lets say i have an independent random variable X and Im having difficulties on wrapping around the idea on the...

• Replies: 2
• Views: 1,782
01-29-2017, 11:15 AM
20. ### Intro Statistics books too superficial?

I am sure many of you are familiar with the undergraduate "Intro" college textbooks on Statistics. Sometimes I feel these books are "cheating"...

• Replies: 1
• Views: 2,045
01-29-2017, 01:30 AM
21. ### Which significance test should I use?

I have a research questionnaire using a five point Likert scale (not at all, little, neutral, considerable, significant). I want to statistically...

• Replies: 1
• Views: 1,478
01-28-2017, 04:44 AM
22. ### Assumption for inferential regression

I was reading about regressional inference and one of the assumptions stated was: The standard deviation of the responses about the population...

• Replies: 3
• Views: 1,627
01-27-2017, 07:25 PM
23. ### Mallows Cp

Hi all, I'm trying to manually resolve Cp for a simple set of data, but my results don't match the ones I get from Minitab. Data (a is the...

• Replies: 0
• Views: 1,450
01-27-2017, 11:14 AM
24. ### outlier in robust regressiom

hi, I dont understand with this statment. "robust regression can be used to detect outliers and to provide resistant (stable) results in the...

• Replies: 1
• Views: 2,027
01-26-2017, 11:02 AM
25. ### Type II Error in Likelihood Ratio Tests

Good afternoon, I'm currently working on my master thesis. I'm trying to recommend some improvements to the likelihood ratio tests that already...

• Replies: 2
• Views: 2,335
01-25-2017, 02:38 PM
26. ### Calculating pooled standard deviation for more than two groups of unequal sample size

Hi all, I struggle with calculating the pooled standard deviation for more than two groups of unequal sample size. After searching the internet...

• Replies: 0
• Views: 1,890
01-24-2017, 10:10 AM
27. ### Meta-analysis: number of effect sizes needed for meaningful moderator analysis

Hi there, I would like to conduct a moderator analysis looking at the effects of six different moderators on the relationship between anxiety in...

• Replies: 2
• Views: 2,188
01-23-2017, 05:07 PM
28. ### Meta-analysis: How to calculate cohen's d using the range of scores and sample size

Hi there, I am trying to calculate cohen's d (standardised mean difference) for a study that only reports the range (min and max), and not the mean...

• Replies: 4
• Views: 3,109
01-23-2017, 05:05 AM
29. ### Need help on lognormal distribution

Hello I'm a newbie here. I need help on how to find mean and standard deviation for a lognormal distribution. I've been searching on the internet...

• Replies: 1
• Views: 2,265
01-22-2017, 10:29 AM
30. ### Nominal & Ratio Variables: How to correlate?

The following is the hypothesis I'm trying to work with: "Students who do not achieve at least 70% in high school English will not pass a college...

• Replies: 7
• Views: 3,620
01-20-2017, 01:34 PM
31. ### test of a decreasing function

Hello :wave: I have some doubts about testing the effect that a decrease in value of x (independent variable) has on y (the dependent variable) ...

• Replies: 0
• Views: 3,118
01-20-2017, 06:35 AM
32. ### Stats Homework Help

Hey Everyone! :) I am stuck on some stats homework questions! Hoping someone can help me out.. 1. A friend flips a coin 10 times and says that...

• Replies: 0
• Views: 2,336
01-19-2017, 09:39 PM
33. ### Determining which SPSS statistical test to use on unusual data

Hi all! I am new here and am desperately in need of some expert assistance in choosing the correct statistical test to use. I am looking at the...

• Replies: 0
• Views: 2,039
01-19-2017, 07:16 PM
34. ### Statistics Problem...

I have been trying to help my mother the best I can with her studies but we have came across a very large wall we can not seem to take down. The...

• Replies: 4
• Views: 2,806
01-19-2017, 04:21 PM

Hi I'm studying the effect of different music styles on performance tasks. I'm considering a mixed ANOVA analysis, but I'm not very confident...

• Replies: 3
• Views: 2,447
01-19-2017, 02:15 PM
36. ### which type of hypothesis test?

Hello guys, I have a sample of 10.000 accommodations in 2013- 2016. I want to test two things but I am not sure I am on the right path. ...

• Replies: 6
• Views: 2,868
01-19-2017, 12:08 PM
37. ### ROC Curve - Assumptions?

Hi All, I'd like to run a ROC curve analysis and was wondering if there are any statistical assumptions for this test. I've looked in a number...

• Replies: 7
• Views: 3,579
01-19-2017, 10:07 AM
38. ### Regression Analysis-Moderation or Mediated Analysis

Please excuse my lack of understanding of Regression Analysis, but would it be more appropriate to run a moderated or mediated regression analysis...

• Replies: 2
• Views: 2,946
01-18-2017, 01:58 PM
39. ### Parameter of dispersion to use

Hello, I have a quick question, first here is an example: These are two paramaters, let's say genes A and B and their level of expression in 9...

• Replies: 1
• Views: 1,918
01-18-2017, 10:00 AM
40. ### Model convergence and fit

Hi, I am not understanding what the difference is between model convergence (as in a multivariable logistic regression model), versus the fit of a...

• Replies: 5
• Views: 2,339
01-17-2017, 08:53 AM
41. ### Is a Bonferroni correction needed for my particular dataset?

I received a review of my manuscript in which one of the three reviewers advised that I will need to apply a Bonferroni correction due to multiple...

• Replies: 6
• Views: 3,233
01-16-2017, 02:08 AM
42. ### Simple percentage comparison

Hi, I am working on a competition between 4 groups of people. The winner is the person who gets the most number of participants to show up at their...

• Replies: 1
• Views: 2,069
01-15-2017, 12:36 PM
43. ### paired or unpaired?

Hi, Need some advice, if I'm comparing species abundance in the same location across two different seasons is this paired or non-paired for...

• Replies: 6
• Views: 3,172
01-15-2017, 07:43 AM
44. ### Interpretation of a certain observation

I have some identities that are distributed in a 2D space. Each identity has the properties X, Y, latitude, and longitude. Each dataset on average...

• Replies: 2
• Views: 2,454
01-14-2017, 05:08 PM
45. ### Diagnostic test - speciicity when multiple testing - clever statistician needed!

During validation of a diagnostic test a false positive event is observed in 1 out of 60 occasions leading to a specificity of 98.3% when testing for...

• Replies: 1
• Views: 2,681
01-13-2017, 03:49 PM
46. ### Comparing Groups in Ordinal Logistic Regression

Hi, I seem to have gotten a little confused about the possibility of comparing groups in ordinal logistic regression. Here is my issue: I...

• Replies: 0
• Views: 2,402
01-13-2017, 05:36 AM
47. ### Missing data - seeking advice on approach!!

INTRO:Planning list wise deletion of missing data from large data set (7772). Data is from online survey, participation self-select. Q's could be...

• Replies: 0
• Views: 2,597
01-13-2017, 04:15 AM
48. ### Confidence interval of density distribution

Hi, I am a university student and I have a trouble with the following example. This is not what I am actually confronting, but I think it will make...

• Replies: 3
• Views: 2,948
01-13-2017, 01:46 AM
49. ### when to standarize and when to normalize

I dont understand when is it appropriate to standardize my data and when it is appropriate to normalize my data. I know it will differ by project of...

• Replies: 0
• Views: 2,875
01-12-2017, 05:51 PM
50. ### Calculating 95% Confidence Intervals for Prevalence (%)

Hi All, I am hoping to get some advice on how I can calculate the 95% Confidence Intervals for prevalence percentages. My sample size is 180, and...

• Replies: 4
• Views: 5,064
01-12-2017, 03:46 AM
51. ### Composite cut off calculation? And to convert number to percentiles?

Hi, Can anyone please tell me how to create thresholds based on 3 parameters? For example if I have blood pressure (bp) and want to calculate BP...

• Replies: 1
• Views: 2,770
01-11-2017, 09:34 PM
52. ### Which statistical test? I've shown my attempt to work it out.

2 Questionnaires (for hope and self-image) are given to participants before, during, and after an intervention. All participants take part in the...

• Replies: 3
• Views: 3,164
01-10-2017, 07:11 AM

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