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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: 197,273
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: 67,035
09-30-2005, 09:44 AM
1. ### trying to determine which test to use for constancy of mean price of milk

"You have been asked to determine if the mean price of milk in your city has remained constant. Suppose that a random sample of n=2 was selected for...

• Replies: 0
• Views: 1,654
02-01-2015, 03:44 PM
2. ### Confidence Interval for binary data

If I want to calculate the 99% confidence interval for binary data. For example lets say I asked 500 people if they had ever done a bungee jump? ...

• Replies: 0
• Views: 2,297
02-01-2015, 02:48 PM
3. ### Sample size calculation for kappa statistic, at 90% power

Hello everyone! I have looked through many previous posts, but cannot find an answer to my question. I am comparing the results from two pieces of...

• Replies: 1
• Views: 4,632
02-01-2015, 10:24 AM
4. ### Adding the mean to a set of scores doesn't change it. Why?

Hello everybody! I am very happy to have found this forum. I am working away with my undergraduate research methods courses. I am not very good at...

• Replies: 8
• Views: 2,653
01-31-2015, 04:58 AM
5. ### Performing a Paired T test

239 subjects had their cholesterol measured, and then were put on high-fiber diets. After a month on the high-fiber diet, the cholesterol was...

• Replies: 0
• Views: 1,261
01-30-2015, 11:39 PM
6. ### Is there a way to convert relative risk to cohen's d or odd's ratios?

So I only have RR but no counts. For a meta-analysis these need to be put on a common metric with other results which all use cohen's d. Hence the...

• Replies: 10
• Views: 3,686
01-30-2015, 05:42 PM
7. ### Equivalence testing - on IQ scores for independent groups

Equivalence testing IQ Hello, I want to conduct a test of equivalence on IQ between two groups. I came across a post where someone (I think it was...

• Replies: 6
• Views: 1,897
01-30-2015, 03:01 PM
8. ### What is pillai's trace value?

Dear fellows, I stumbled on this using the software Gpower, Doing some basic research I cannot really understand what exactly is!:confused: ...

• Replies: 0
• Views: 3,432
01-30-2015, 07:11 AM
9. ### independent or dependent samples

I am trying to learn which test to use to determine if the difference between two samples is significant. For instance, "The following data set...

• Replies: 1
• Views: 1,827
01-30-2015, 03:37 AM
10. ### How to detect a seasonnal variation on time series data

Hello everyone, I would like to compare the distribution of night bat activity recorded each hour from 5 pm to 3am (a number of call per hour)...

• Replies: 0
• Views: 899
01-29-2015, 11:45 PM
11. ### Scoring model/formula to rank based on accuracy of data sources

Let us say i have 5 different data sources. My aim is arrive a score to arrive the accuracy of this data sources. It is like below 1. Refer the...

• Replies: 0
• Views: 1,555
01-28-2015, 08:11 PM
12. ### Confidence Intervals

Let p1 and p2 be the respective proportions of women with nutritional anemia in each of two developing countries. If a random sample of 250 women...

• Replies: 0
• Views: 1,572
01-28-2015, 08:11 PM
13. ### Basic question...how to calculate minimum sample size with complete population data

Hello, out-of-practice stats guy here. A business question I have is what is the minimum sample size I need to accurately measure revenue per...

• Replies: 1
• Views: 1,624
01-28-2015, 03:09 PM
14. ### Which Statistical Test to use for my project - Comparing two ranked lists, 2 groups

I have a project comparing two medical treatments - 1) Treat a Presentation and 2) Treat after Growth. I am comparing the groups based on the...

• Replies: 0
• Views: 1,386
01-28-2015, 03:02 PM
15. ### Formula question (frequency based dominance index FDI)

solved: its a summing over both the i and the k. Reading the manuscript again I realized which cells must be omitted when doing the double...

• Replies: 0
• Views: 1,170
01-28-2015, 01:37 PM
16. ### Spatial statistics: proving a relationship between the proximity of two features

Dear all, I have several maps of an estuary, with two variables noted for each year the map was made: position of salt marsh edge and position of the...

• Replies: 0
• Views: 1,359
01-27-2015, 01:34 PM
17. ### How to model/test the accuracy of a computer simulation vs real life?

I want to do a project where I see how accurate FIFA 14 is at simulating soccer. I am planning to simulate a full Premier League season by using the...

• Replies: 0
• Views: 1,238
01-26-2015, 10:57 PM
18. ### Randomized Block ANOVA

While reading through my lecture notes, I came across a randomized block ANOVA model and some assumptions. What intermediate steps did the authors...

• Replies: 0
• Views: 1,345
01-26-2015, 05:19 PM
19. ### Different Sample sizes in 3 way contingency tables

Hi there ;) I am looking at the relationship between two variables age (young/old) and income (low/medium/high), using a contingency table as...

• Replies: 0
• Views: 1,592
01-26-2015, 12:24 PM
20. ### Determining Nature of Regression Analysis

I have the following dependant and four independent variables: Dependant  Ratio -- this is actually a count, but IDK if that makes it a ratio...

• Replies: 3
• Views: 1,704
TMF
01-26-2015, 10:14 AM
21. ### How to calculate the distance from the mid-point of a Likert scale using the mean?

I've recently completed a survey which offers respondents options from 1 (Strongly agree) through to 5 (Strongly disagree). This has allowed me...

• Replies: 1
• Views: 1,378
01-26-2015, 08:48 AM
22. ### Forget how to normalize to a range

I used to know how... I want to normalize a set of data to -2.5 to 2.5, but I only remember how to do between 0 and 1, any help or references would...

• Replies: 1
• Views: 1,553
01-26-2015, 08:17 AM
23. ### I am sure I am overthinking this...

HI, I am a graduate nursing student taking an informatics course. I am doing some review questions that really are basic, and like I said , I am...

• Replies: 0
• Views: 1,695
01-25-2015, 11:13 PM
24. ### Confidence interval

I calculated a 95% confidence interval around a the response rate I got from a list of people age 30-39. How else can I test this response rate and...

• Replies: 0
• Views: 2,593
01-25-2015, 04:15 PM
25. ### Cronbach Alpha vs Pearson r

Hi all, this might sound like a completely amateurish question but...what is the practical difference between cronbach's alpha and the Pearson...

• Replies: 25
• Views: 38,245
01-25-2015, 05:51 AM
26. ### Need help analyzing my data for a research project.

Kind of embarrassed to ask basic stats questions, but it's been a solid decade since I've had to design my own study. I'm doing a retrospective study...

• Replies: 2
• Views: 2,362
01-24-2015, 08:59 AM
27. ### Calculate Sigma and µ for a normal distribution

Hallo! I don't know how to solve the following problem: A company manufactures automobile parts. If a part has a diameter between 19.9mm and...

• Replies: 2
• Views: 2,330
01-24-2015, 04:37 AM
28. ### Continuous or categorical variable

Hi guys, I'm currently enrolled in a medical statistics course and I'd like some help with a problem I'm facing. I have a dataset that contains...

• Replies: 14
• Views: 2,224
01-23-2015, 06:02 PM
29. ### Confidence interval for pooled variance of multiple populations?

Given: -10 data sets from different populations -20 measurements per data set -Each data set has a statistically different mean -The variance...

• Replies: 1
• Views: 1,631
BGM
01-23-2015, 06:21 AM
30. ### Standard Deviation of a Sequence of Standard Deviations

Hi, My goal is to estimate arrival times of buses at bus stops where historical GPS data for each bus is available and real-time bus location is...

• Replies: 1
• Views: 1,106
Clk
01-22-2015, 08:54 PM
31. ### Help with hypothesis forming

Hi All, I am newbie to statistics. When I read the literature regarding null hypothesis, I understand that the null hypothesis should always...

• Replies: 4
• Views: 1,329
01-22-2015, 03:49 PM
32. ### What is seasonality and how is it defined?

Let's say that I have a univariate dataset pertaining to sales and people claim that the sales numbers follow a seasonal pattern. I get that when...

• Replies: 5
• Views: 2,961
01-22-2015, 12:24 PM
33. ### T-test .. new student pls help

Hi everyone .. I'm new to the forum and need help in my new class. I have two questions can someone be kind the explain what I need to do? 1....

• Replies: 7
• Views: 2,173
01-22-2015, 10:53 AM

Not sure if the forum permits it, but just a quick plug that Stanford just launched a statistics class that would run from January to April to learn...

• Replies: 1
• Views: 1,016
01-22-2015, 12:56 AM
35. ### Correlation with a nominal variable?

Hello, I'm conducting a research project where I'm trying to find the correlation between the LSI-R total score (survey) and recidivism (if the...

• Replies: 14
• Views: 32,384
01-21-2015, 08:43 AM
36. ### Resampling for pseudo-sample size calculation

Hey, I have a multiple logistic regression model with four binary independent variables (IV) with an additional interaction term (consisting of...

• Replies: 4
• Views: 2,755
01-20-2015, 10:01 PM
37. ### Entering interaction terms

I am new to this site, but have high hopes that I can find some relief. I have a question regarding entering interaction terms (moderation) in...

• Replies: 6
• Views: 1,449
01-20-2015, 08:14 PM
38. ### Identifying data for which variance is isolated to a few observations

The problem I'm running into has to do with biological data, but is not specific to a biological system, and I suspect the answer is fairly...

• Replies: 4
• Views: 1,492
01-20-2015, 06:33 PM
39. ### Is it statistically correct to conduct ANOVA upon the R-squares evolution?

Hello everybody, My issue is basically the question exposed in the title. I have a model where 5 factor explain the variance of the DV....

• Replies: 1
• Views: 1,013
01-20-2015, 09:28 AM
40. ### Finding Generalized Linear Ratio Test Statistic for binomial distrributions

Suppose that X is a random variable with that follows a binomial distribution with parameters n and p_x. And let Y be a random variable independent...

• Replies: 0
• Views: 1,236
01-19-2015, 11:54 AM
41. ### physio

Hi please help! I am trying to figure out which/what stat(s) to use for my quasi-experimental design. There are 2 non randomized groups they...

• Replies: 2
• Views: 1,452
01-19-2015, 11:45 AM
42. ### Basic question

Suppose my null hypothesis is “Not more than 50% person prefer milk” and alternate hypothesis is “More than 50% (or majority) prefer milk”. Actually...

• Replies: 1
• Views: 1,429
01-18-2015, 07:49 AM
43. ### Statistical Problem..Need assistance.

How do I know what alpha level to use in a statistical problem that doesn't give one? Is the p-value for z=6.75 = 0.0001? Finally, how do I...

• Replies: 3
• Views: 1,471
01-17-2015, 02:40 PM
44. ### Standard Deviation of Mean Absolute Error

Hi guys, As basic as this question is, I'm looking for a way to calculate standard deviation of mean absolute error using pivot table or atleast...

• Replies: 1
• Views: 1,662
01-17-2015, 02:10 PM
45. ### Which statistical test to use?

Hi Guys, I have two datasets that I need to compare for means, but one is much larger than the other. One has about 2000 records, and other about...

• Replies: 1
• Views: 758
01-17-2015, 05:05 AM
46. ### Appropriate SAS test for comparing within and between seasons?

I am a new animal science/agronomy grad student trying to analyze my data. I have a very limited stats background (one class with an interesting...

• Replies: 0
• Views: 767
01-16-2015, 03:54 PM
47. ### Gold Standard vs. New Technology

• Replies: 7
• Views: 2,374
01-16-2015, 03:52 PM
48. ### Density function of the mixture of two NHPP

I'd like to know how can I calculate the density function of the mixture of two non-homogeneous Poisson process? I should mention that I have the...

• Replies: 7
• Views: 1,868
BGM
01-16-2015, 02:20 PM
49. ### Is there ANOVA way?

• Replies: 1
• Views: 1,583
01-16-2015, 12:55 PM
50. ### Missing value treatment for categorical & continues variables and testng MCAR/MAR

Hello everybody, My dataset (N=90) consists of ordinal variables serving as IVs and dichotomous and continuous variables serving as DVs. IVs and...

• Replies: 2
• Views: 4,491
01-16-2015, 09:08 AM
51. ### sample size calculation for paired proportions when one discordant pair is 0

Hello! I am trying to calculate sample size for a study using paired data. My groups are such that one discordant pair will always be 0. I...

• Replies: 1
• Views: 1,707
01-15-2015, 04:47 PM
52. ### Minimum Detectable Difference for Two-Sample t-Test for Means

Dear all, I was looking for a method for posthoc calculation of the minimum detectable difference for Two-Sample t-Test and I came across this...

• Replies: 0
• Views: 3,124
01-15-2015, 06:00 AM

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