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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,873
09-30-2005, 09:44 AM
2. ### 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: 197,002
07-16-2014, 11:01 AM
1. ### Difference between the population and sample

I have a general understanding of the difference between a population (set of entities under study) and a sample (a subsection selected from the...

• Replies: 1
• Views: 2,642
05-13-2011, 05:27 PM
2. ### Normality Tests

• Replies: 4
• Views: 2,164
05-16-2011, 10:14 AM
3. ### Basic Question about Weight Average

This is a pretty simple question and I'm wondering how to go about finding a solution. I have the following data. ttt =...

• Replies: 0
• Views: 895
05-08-2013, 10:20 AM
4. ### Probability Question

Urn 1 has 2 white balls and 4 red balls. Urn 2 has 2 white balls and 1 red ball. a ball is then randomly picked from urn 1 and placed into urn 2...

• Replies: 2
• Views: 2,459
05-14-2007, 03:24 AM
5. ### mean time for an random event to occur?

I'm trying to estimate how much margin I must build into a design. The design is very simple: I have a voltage applied to the input of a comparator....

• Replies: 0
• Views: 1,756
09-16-2009, 08:56 AM
6. ### STATA - Finance - Portfolio Volatility

Please refer to the Statistical Package section for this post

• Replies: 0
• Views: 1,222
12-02-2014, 03:45 AM
7. ### Help with analysis of statistical data

Hi, I'm new to this forum, the reason I chose to sing up was because I'm currently in the middle of solving a statistical assignment for my...

• Replies: 0
• Views: 2,363
05-03-2010, 01:24 PM
8. ### Question about Mantel Test results

Hello, I have two matrices that I would like to join together for analysis -providing they are similar "enough". My Mantel test stat result was...

• Replies: 0
• Views: 2,892
08-27-2008, 10:08 PM
9. ### Confounding vs. Extraneous Variables?

I need to know the difference between these two in a psychological research paper I am studying, in which there are two levels of independent...

• Replies: 3
• Views: 2,544
04-01-2014, 03:09 PM
10. ### Help determining normality test...low N and uneven sample size

Hi all, I am trying to do some statistics on juvenile coral growth rates from a 4 year study. I am looking to answer how growth rates differ from...

• Replies: 1
• Views: 3,758
04-27-2010, 11:13 AM
11. ### Unweighted and Weighted Data (Chi Square)

Here's my situation: I have a dataset with unweighted data taken from a small, annual survey. I also have a large dataset with weighted and...

• Replies: 0
• Views: 7,207
01-19-2007, 08:38 AM
12. ### Which analysis do i need for this type of likert-scale questions?

Hi! I have two questions in my questionnare which has already been applied to 507 people. The questions are like this: There are the factors which...

• Replies: 0
• Views: 3,064
06-07-2009, 05:55 AM
13. ### Interpreting sensitivity and specificity with corresponding PPV and NPV

Hello, I have calculated sensitivities, specificities with pos and neg predictive values for different cutoff values of two biomarkers. What i...

• Replies: 9
• Views: 3,531
08-15-2013, 02:43 PM
14. ### Hypothesis Testing of Plant Height

Hello, I'm trying to figure out how to do hypothesis testing, working only from class notes, and the following example I just cannot follow. " We...

• Replies: 1
• Views: 3,790
12-12-2007, 12:00 AM

I am working on project that is comparing two types of corn and their crop yield. For each corn variety they were planted in various soil types and...

• Replies: 1
• Views: 1,207
03-23-2014, 04:08 PM
16. ### Effective sample size

Hi, I'm trying to work on a survey dataset, and am unsure whether I should be using the effective sample size, or the actual sample size as a...

• Replies: 0
• Views: 2,614
03-23-2010, 11:07 AM
17. ### Coefficient of variation

I have some yearly time series data (20 years) on the level of income for a variety of institutions, and want to assess whether the level of...

• Replies: 0
• Views: 3,375
12-06-2010, 12:58 PM
18. ### Test to compare email open rates

Hi, I am trying to measure an email campaign and I have the open rates of emails from various segments of customers (there are about 10 segments...

• Replies: 3
• Views: 1,939
11-07-2014, 02:39 AM
19. ### Logistic regression cutoff at 0.3

Hi, I have built a logistic regression model with misclassification rate around 18%. When I look at the ROC curve(area under the curve is 0.76)...

• Replies: 3
• Views: 1,381
11-23-2014, 07:12 AM
20. ### LInear discriminant analysis

I have been reading up on LDA and I found the following on Wikipedia Homogeneity of variance/covariance (homoscedasticity): Variances among...

• Replies: 0
• Views: 1,382
11-26-2014, 11:08 PM
21. ### Any One Can Tell Me Desirable Properties of Interval Estimation ?????

• Replies: 8
• Views: 1,434
11-21-2013, 11:48 AM
22. ### Intresting In Statistics

Hi , I hope you all of you fine if any wanna intrested or want to work together, or publishing the paper he can contact with me, I will help all of...

• Replies: 0
• Views: 1,179
06-27-2013, 12:39 PM
23. ### Need Help

Any one can help me on this topic i need help on "Ethical hacking and networking and their role in statistics"

• Replies: 1
• Views: 932
01-30-2014, 07:53 AM
24. ### Efficiency of an estimator (truncated Poisson)

Hello, I wonder if anyone could help me with this problem. I have been asked to answer Exercise 2.23 of this book; ...

• Replies: 0
• Views: 2,349
10-26-2009, 04:04 AM
25. ### is there another solution? this one is not intuitive.

Here is the problem and the solution. I understand them both but, the solution is not intuitive. Is there another way to work it out? problem: ...

• Replies: 5
• Views: 4,765
03-31-2011, 02:18 PM
26. ### Descriptive Statistics

There's information about a variety of descriptive statistics, such as measures of location, measures of variability, and measures that will help you...

• Replies: 3
• Views: 2,696
02-04-2012, 08:28 PM
27. ### Calculating Z- Scores.. Anyone??

Ok, I know how to get to the Z score using the standard deviation and the mean. However I am not sure how to figure a out a problem in regards to...

• Replies: 1
• Views: 3,354
07-12-2009, 08:53 PM
28. ### Confidence Intervals

Hello All, I am having a bit of trouble figuring out what equations to use when asked to find a particular percentage for a confidence interval...

• Replies: 0
• Views: 2,848
07-22-2009, 02:05 PM
29. ### Calculate the exact P-Value for an F-Test by hand

Does anyone know the algorithm, formula, or procedure to calculate the exact p-value for an F-test by hand? I already know how to find out what...

• Replies: 2
• Views: 27,139
09-07-2011, 09:38 PM
30. ### Mixed model

Hello there! I have a question concerning my data and the use of Mixed models in SPSS 21.0. I want to investigate the influence of the...

• Replies: 0
• Views: 755
05-21-2017, 03:53 AM
31. ### Question about which test to use

Hi there everyone, I apologize if this is in the wrong section. It is not technically coursework but is elementary (I think) so I put it here! ...

• Replies: 1
• Views: 1,370
12-08-2015, 02:59 AM
32. ### Sampling Distribution

Hi Guys, I hope you can help me out to figure what I am doing wrong... I have the answer to the exercise and I don't get how I find something...

• Replies: 0
• Views: 202
08-20-2017, 05:53 AM
33. ### ANOVA/ANCOVA/Regression

question : The linkage between "self learning" and "work efficiency" differs between women and men can be determined by : a. two-way ANOVA....

• Replies: 6
• Views: 3,382
02-08-2009, 10:24 AM
34. ### 4 sets of true/false data

I just need a hint .. I have 19 subjects, and I have performed 4 types of examinations on each of them - trying to measure the same parameter...

• Replies: 1
• Views: 1,527
02-26-2009, 03:13 AM
35. ### lot quality assurance sampling

Why in lot quality assurance sampling, means are compared, when in fact we are getting proportions as immunization coverage etc.?

• Replies: 0
• Views: 1,705
07-28-2011, 10:23 AM
36. ### How can I compare regression coefficients in a same multivariate regression mode

Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

• Replies: 3
• Views: 1,993
02-27-2014, 11:45 AM
37. ### Statistical Study Help

Hi, would someone mind reading this study and explaining the statistics used and some of the graphs and charts? I'm only in an introductory...

• Replies: 0
• Views: 1,279
06-03-2014, 07:07 PM
38. ### Logistic Regression

Could someone explain the basics of logistic regression? Thank you!

• Replies: 12
• Views: 3,119
06-06-2014, 05:01 AM
39. ### calulating a sample size for a PhD project

Hello all, And thank you for viewing my post, I have begun developing my PhD proposal and become unstuck on sample size calulations. this is what...

• Replies: 5
• Views: 3,039
01-29-2013, 03:02 PM
40. ### Z score

I am having difficulty understanding the Z score. Its looks like that SD and Z score is doing the same function? Could you please explain with small...

• Replies: 2
• Views: 4,204
01-25-2006, 05:41 PM
41. ### New Student need help

Hi, I am a new student in statistics and any help will really appriciate. I am doing my assignment and one of the question was about level of...

• Replies: 2
• Views: 3,121
01-25-2006, 11:12 AM
42. ### Variability

Hi, I have a question for my home work about finding the 3 measure sof vairability for the variable that is given to us.but i am little confuse...

• Replies: 2
• Views: 3,923
02-01-2006, 10:49 AM
43. ### level of meausrement

Hi , I am woundering if you can tell me if I am corect in understanding the levelof mesuremnet? The following data's level of measurement is...

• Replies: 2
• Views: 3,091
02-13-2006, 03:53 PM
44. ### level of measurement

Hi John, just to confirm if the following is the ratio measurement. I belive its ratio because the zero is the actual possibility, when there is no...

• Replies: 4
• Views: 7,906
02-23-2006, 01:53 PM
45. ### level of measurement.

Hi john, I am real confuse when I see zero in the data, in the following I am thinking,:confused: is ordinal but when I see the zero it seems it...

• Replies: 2
• Views: 2,650
03-24-2006, 10:56 AM
46. ### Calculating Sample Size - Determining Sampling Plan

Hi All, I need some help to determine the best method to go about setting up a sampling plan of some sort. Here is the situation... our business...

• Replies: 2
• Views: 1,373
03-10-2015, 08:23 AM
47. ### help need

AOA respected sir kindly guide me in this artical which link is given below, how auther has been drived instability index value in table no. 4 with...

• Replies: 0
• Views: 1,719
01-03-2011, 07:52 AM
48. ### Correlation of dependent variables

Hello! I've been googling all night without finding what I'm looking for, so now I post here hoping that someone can point me in the right...

• Replies: 5
• Views: 6,016
02-01-2011, 08:39 PM
49. ### McNemar test: are my reviewers bone-headed or have I misunderstood?

Hi all, I would very much appreciate any comments on an analysis I have conducted. I think it's a straightfoward issue, but several reviewers of...

• Replies: 1
• Views: 2,491
10-06-2009, 01:39 PM
50. ### Pool data from individuals in sign test or Fisher's exact test - valid or pseudorep?

Hi all! My intuition is telling me a particular approach is valid even though is appears to go against the principle of not pooling multiple data...

• Replies: 10
• Views: 2,893
03-16-2012, 04:52 AM
51. ### nonlinear least square vs. maximum likelihood

I am trying to fit spawner recruit data to typical recruitment models (e.g. Beverton holt, Ricker), can this be done with nonlinear least squares, or...

• Replies: 0
• Views: 2,514
03-16-2011, 02:05 PM
52. ### standardizing a small sample?

I'm looking to compare a sample A (n=33) to a smaller sample B (n=18). In both of these samples, several different measurements and counts were...

• Replies: 0
• Views: 1,749
04-26-2011, 11:48 PM
53. ### small sample size n=18

I have two samples and I was wondering if there is a way to standardize the calculations in my smaller sample so that the calculations in both...

• Replies: 6
• Views: 4,205
04-30-2011, 07:21 PM
54. ### Questions about KL divergence

Hi all, I am comparing two distributions with KL divergence which returns me a non-standardized number that, according to what I read about this...

• Replies: 1
• Views: 3,283
08-03-2010, 04:48 PM
55. ### Publications that use/report KL divergence

Who can point me to papers and publications that used KL divergence and report it in the paper in some direct form. I would like to read how it is...

• Replies: 0
• Views: 2,746
07-29-2010, 09:21 PM
56. ### Methods for distributional

The question in short: What methods can be used to quantify distributional relationships between data when the distribution is un-known? Now the...

• Replies: 0
• Views: 2,300
08-03-2010, 04:58 PM
57. ### Lorenz curve = QQ plot ?

Are Lorenz curves and QQ plots the same? If not, where are the differences? I read about both of them and they appear to be two terms for the same...

• Replies: 1
• Views: 3,921
09-22-2010, 12:50 PM

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