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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: 200,111
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: 68,420
09-30-2005, 09:44 AM
1. ### [SPSS - Correlation] Correlation between binary variables?

Hi, I have a question about the limitation of a correlation. I'm using SPSS and have a lot of multiple choice questions with multiple answers...

• Replies: 2
• Views: 1,093
05-16-2017, 06:18 PM
2. ### Analyzing changes in fishery over time

Hi all! I'm a rookie in statistics, but just wrapped up a semester of R analysis for natural resources. I'm working on my grad capstone and hoping I...

• Replies: 0
• Views: 1,010
05-15-2017, 10:38 PM
3. ### Regression equation and prediction

Predict the average marks of a student in Year 6 who has raised their hand 35 times, visited 40 resources, looked at 75 announcements, participated...

• Replies: 3
• Views: 1,229
05-14-2017, 11:13 PM
4. ### Non-converging model

I ran a Generalized Gamma Linear Regression Model which didn't converge which means that I don't have coefficients, confidence intervals or p values...

• Replies: 2
• Views: 917
05-13-2017, 10:13 PM
5. ### Which correlation test when researching the effect of previous success on change?

Hi everyone, I'm doing research on business owners, who have started multiple businesses. I had a sample of 2500 businesses and looked at the...

• Replies: 0
• Views: 776
05-13-2017, 02:28 PM
6. ### significance test begin of puberty

Hello, I am running a metaanalysis about the age of girls and boys at the beginning of puberty (Tanner-stages) and it would be great if someone...

• Replies: 9
• Views: 1,371
05-13-2017, 07:50 AM
7. ### Some sort of one way control chart ??

Hi I have a number of samples and i want to find some lower limit so, lets say that 5% of the samples go below the lower limit. I cannot use...

• Replies: 1
• Views: 1,122
05-12-2017, 11:07 AM
8. ### Statistically independent

Answered the first part of the question: What is the probability that we could randomly select a student whose grade is at least 70? What is the...

• Replies: 0
• Views: 847
05-12-2017, 02:00 AM
9. ### ANOVA? Looking at percentage habitat use (6 different habitats) across four seasons

Hi, I am trying to look at whether habitat use of 6 different habitat types differs across 4 seasons. I have managed to run ANOVA tests but I'm...

• Replies: 1
• Views: 994
05-11-2017, 02:16 PM
10. ### Help with RPSFT model implementation in SAS

Hi! I am doing an analysis on overall survival endpoint. The patients in the placebo group will be switched to treatment group in the open-label...

• Replies: 1
• Views: 1,564
05-11-2017, 08:03 AM
11. ### combination of uncertainties

I try to measure a specific quantity in a target. I assume there are mainly 2 sources of uncertainties, let's call them sigma 1 and sigma 2. I want...

• Replies: 3
• Views: 1,049
05-10-2017, 11:26 PM
12. ### Comparing habitat use across two different locations - mann whitney U?

Hi, I'm really stuck with what test to use with my data. I have data on habitat use of 6 different habitat types across 2 locations and I'm unsure...

• Replies: 2
• Views: 748
05-10-2017, 03:43 PM
13. ### Upper-tail, lower-tail or two-tail test

Hi, I am unsure as to which test is used for the following question: A school administrator believes that students enrol in a sport course as they...

• Replies: 1
• Views: 1,395
05-10-2017, 11:54 AM
14. ### poisson distribution example

If the mean rate of arrival in a restaurant is 10 customers per hour, what is the probability of having 4 customers arriving in any hour? P(4)...

• Replies: 3
• Views: 1,149
05-09-2017, 07:15 PM
15. ### Support vector machines - what's the point?

hi, I just finished the chapter on SVMs from the Statistical Learning book of Hastie and Tibshirani. Their focus is to use the SVMs for...

• Replies: 1
• Views: 1,135
05-09-2017, 01:48 PM
16. ### convert SD of travel time to SD of speed (reciprocal of SD?)

I am trying to get the standard deviation of the reciprocal values of a dataset. Unfortunately, I don't have the original data, only the mean,...

• Replies: 4
• Views: 7,523
05-09-2017, 08:16 AM
17. ### Categorical or Continuous ?

Hello everyone, I have done an experiment in Ergonomics and now I'm dealing with the analysis. It's about a manual lifting task and heart rate...

• Replies: 1
• Views: 1,132
05-09-2017, 12:27 AM
18. ### Binomial logistic regression linearity assumption with categorical variables ?

I am trying to run a binomial logistic regression, and would like to check the linearity assumption. However all the resources I'm reading discuss...

• Replies: 5
• Views: 1,462
05-09-2017, 12:23 AM
19. ### Can someone please check my answers? It's over confidence intervals

This isn't techinally homework. It's extra practice questions giving by my teacher. I just want to make sure I'm understanding everything correctly....

• Replies: 0
• Views: 903
05-08-2017, 02:20 AM
20. ### Question about Repeated Measures and Type 1 Error

I'm working on analyzing a study where there are a number of buckets of soil and observations were recorded on how many plants are visibly growing...

• Replies: 4
• Views: 1,297
05-08-2017, 01:53 AM
21. ### Best fitting model for one gold standard value ?

Hello, trying to solve the following statistical problem in jmp: 1. I got a gold standard y (for example: y = 100) 2. I got three data...

• Replies: 3
• Views: 1,187
05-07-2017, 01:36 PM
22. ### < or > minus numbers

If I wished to say everyone who scored between -100 and -10 was virtually blind, which one of these statements is correct; 1. Everyone who scored...

• Replies: 0
• Views: 1,038
05-07-2017, 12:55 PM
23. ### Incomplete Anova Problem

Hi guys I am trying to solve the ANOVA problem Q3B I have attached but not getting anywhere. Any help would be appreciated ! I am always getting...

• Replies: 1
• Views: 946
05-04-2017, 08:47 PM
24. ### Multivariate and univariate outliers

Hi, Can I just check my understanding of something?! In order to run a repeated measures ANOVA, perform mediation analysis using structural...

• Replies: 1
• Views: 1,089
05-04-2017, 02:50 PM
25. ### number of means (k) and degrees of freedom (df) in 2 way ANOVA for q in TUKEY'S HSD

Hi everyone I have this data for pH of river water, collected over four sesons from five sites in triplicate. Season 1 Site 1 7, 7, 7 Site...

• Replies: 0
• Views: 361
sk2
05-04-2017, 07:18 AM
26. ### No Direction for Project

Hello, everyone. And thank you all for what you do. I seek your council as I succumb to the truth that my teacher is not going to help me. Even this...

• Replies: 4
• Views: 1,421
05-03-2017, 10:51 AM
27. ### significant chi-square but non-significant standardized residuals

Hello, I am running 2x2 and2x3 chi-square tests. For one of the tests I ran, although the Chi-square statistic was significant, none of the...

• Replies: 3
• Views: 1,047
05-03-2017, 10:45 AM
28. ### sampling/probability/correlation?

I have in my course this problem do you have any idea from people who work daily with stats ? the question is like that: the following data are...

• Replies: 0
• Views: 679
05-03-2017, 09:24 AM
29. ### Normalization of the domain of a data set

Hello. I need to normalize a variable to a new # of data points, specifically expand the variable from 70 to 100 points, keeping the same shape and...

• Replies: 2
• Views: 1,048
05-02-2017, 07:28 PM
30. ### Confidence Interval

Construct a 90% confidence interval on the population mean if a random sample of 25 items taken from a normally distributed population with a...

• Replies: 1
• Views: 1,073
05-02-2017, 03:56 PM
31. ### Mann-Kendall - Data

Dear Everyone, I am currently use Mann-Kendall Test to test on Stream Flow. I would like to ask, Is there any rule or minimum requirement of data...

• Replies: 2
• Views: 1,070
05-02-2017, 12:40 AM
32. ### Expected Value + Variance

Hi guys just a quick question I am told i have two values which are 100 with probability of 0.8 and 1000 with probability of 0.2. Now, I know the...

• Replies: 1
• Views: 926
05-01-2017, 10:33 PM
33. ### Comparing means from two dependent (or semi-dependent) populations

Hi, I'm after a little bit of advice about testing means for statistical significance. I have some survey data from two different periods that...

• Replies: 0
• Views: 1,136
05-01-2017, 05:32 PM
34. ### Upper thresholds for response times ??

Hi! I've been asked to determine the lower and upper thresholds for our response times for the fire department for which I work. I watched this...

• Replies: 0
• Views: 866
05-01-2017, 11:38 AM
35. ### Bayes Hypothesis testing via model comparison

Any idea for this exercise? Thanks for help...

• Replies: 0
• Views: 781
05-01-2017, 02:43 AM
36. ### Stats Novice: Help finding if 1 value affects another

Apologies I have learning trouble and stats are a particularly weak point. Im doing research on 10 animals species, and their conservation status...

• Replies: 0
• Views: 931
04-30-2017, 01:05 PM
37. ### Multiple Regression Homework Help

A team of researchers believed that parental expectations (PE), emotionality (E) and fear of negative evaluation (FNE) promoted social anxiety (SA)....

• Replies: 0
• Views: 987
04-29-2017, 11:16 AM
38. ### Deriving the form of the best size for exponential distribution

Hi everyone So in this question I am told that a supermarket claims that the mean time to serve a customer is equal to 4 mins.However, a customer...

• Replies: 6
• Views: 1,130
04-29-2017, 10:49 AM
39. ### Nominal R2

There already exits an R2 for binomial scale (Generalized R2 after Cox/Snell). Is it possible to further generalize Generalized R2 after Cox/Snell to...

• Replies: 0
• Views: 978
04-29-2017, 05:32 AM
40. ### How can these signal components be independent ???

Hi, In wireless communication theory, the complex baseband representation of a signal passing through a multipath propagating channel is modeled as...

• Replies: 7
• Views: 1,166
04-28-2017, 10:21 AM
41. ### Factorial Design

Suppose a dermatologist wants to study the effectiveness of two different preparations of a skin lotion using two different forms of application (for...

• Replies: 0
• Views: 836
04-26-2017, 06:04 PM
42. ### Forecasting with autocorrelation present

Hello, if one is to compare different lag orders for forecasting (and minimize RMSFE, root mean squared forecast error) for lets say autoregressive...

• Replies: 1
• Views: 886
04-26-2017, 05:52 PM
43. ### What type of statistical test do I use?

Hi. I surveyed 110 people and got two variables: the color of their hair and their score on an exam. I want to find out which group is more likely to...

• Replies: 1
• Views: 1,074
04-26-2017, 01:41 PM
44. ### Statistical summary measure for "loyalty"

Hi, Not sure this is the right forum for questions like this, but I give it a try :) I am selling Apples, Oranges, Bananas and Pears. Now I...

• Replies: 3
• Views: 1,387
04-26-2017, 04:54 AM
45. ### How to calculate reliability of a change score (SAS)

Hi all, I'm hoping you can lend me your expertise on this somewhat obscure problem. I have some repeated measures data (time 1 measurement, time 2...

• Replies: 1
• Views: 1,296
04-25-2017, 11:35 AM
46. ### Multiple response set - is it possible to combine dichotomy and category responses?

Hi, I am analysing questionnaire data in SPSS and looking to create a multiple response set for a question I posed. However the question contains...

• Replies: 0
• Views: 572
dal
04-25-2017, 08:44 AM
47. ### Accounting for other variables when looking for main effects (regression)

I am doing a negative binomial regression, to look for interactions between categorical and continuous predictors. I am currently reporting main...

• Replies: 2
• Views: 1,625
04-24-2017, 11:16 AM
48. ### SPSS - Two-Way Repeated Measures ANOVA correct?

Hi everyone, I was hoping someone could help me out in regards to my methods of analysis. The following experiment setup was a randomised placebo...

• Replies: 1
• Views: 1,302
04-24-2017, 08:36 AM
49. ### F Change Test and ANCOVA

Given R squared between the DV and covariant, R squared between the DV and treatment (two groups), R squared between DV and covariant treatment...

• Replies: 1
• Views: 1,063
04-23-2017, 10:00 PM
50. ### mediation results are not in line with compression of glmm consisted models

hi all, I'll begin with my two question and all the related information (description of the research and the data and full output) will follow. ...

• Replies: 0
• Views: 612
04-23-2017, 09:07 AM
51. ### Comparing small differences in mean values while standard deviation is high...

Hi, I'm sorry if this is a basic question and I'm also sorry for my cumbersome problem description. I guess I'm lacking some serious fundamentals...

• Replies: 1
• Views: 767
04-23-2017, 04:39 AM
52. ### testing the bootstrap

hi, below is an experiment I just did testing whether using a bootstrap I could get better results as with simple repetead sampling. Is there any...

• Replies: 4
• Views: 934
04-21-2017, 11:36 AM

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