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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: 66,934
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: 197,119
07-16-2014, 11:01 AM
1. ### Gini Coefficient

The Gini coefficient is used to compare two distributions. Based on the Wiki pape, applications are wide spread and Gini has been applied in...

• Replies: 1
• Views: 5,378
09-19-2010, 09:28 AM
2. ### Logistic Regression: Interpreting Continuous Variables

Hi All, I had a couple of questions about interpreting odds ratios for continuous variables in logistic regression. I've done some significant...

• Replies: 0
• Views: 2,826
05-05-2014, 05:32 AM
3. ### Reports Dynamically

Is there any statistical tool by which we can generate reports dynamically? I will explain in detail. In case of SPSS, if i did an...

• Replies: 0
• Views: 1,497
07-20-2011, 05:08 AM
4. ### Which statistical test?

Hi I have an exam on Monday and am trying to work out on practice question we received in class. It asks us to identify and match the appropriate...

• Replies: 1
• Views: 2,719
ams
05-21-2007, 07:15 PM
5. ### Why do degrees of freedom matter?

I work with Generalised Linear Models and we use use tests such as chi squared test and the AIC test to compare how good models are. These tests are...

• Replies: 6
• Views: 11,575
12-12-2013, 02:30 PM
6. ### Question on Mean, SD and SEM

A professor has a sample of 500 subjects. The mean is 40, median is 20, range 10-100. a. Could this professor calculate a useful interval with...

• Replies: 1
• Views: 2,180
12-07-2014, 01:48 AM
7. ### Sample error management

Hi Friends, My problem I need to prepare a report on performance time for 12 similar applications that are similar in nature and also have similar...

• Replies: 0
• Views: 1,843
08-21-2009, 01:34 AM
8. ### binomial/sign test

Hi, I was wondering if anyone could please help me out with a binomial test for accuracy data as I'm finding it hard to find any examples using...

• Replies: 0
• Views: 2,740
05-03-2009, 06:55 PM
9. ### I need your help (Urgent)

Hi, I received the below statistics question from my teacher please help me to solve it. Question: When approaching an iceberg, the captain...

• Replies: 1
• Views: 2,215
09-12-2011, 12:59 AM
10. ### Standard deviation effect with single variable

Hi, I have a question about the project I am setting up and was wondering if anyone could point me in the right direction. I feel like I am...

• Replies: 0
• Views: 2,323
07-27-2011, 12:17 PM
11. ### Do I plot a bar graph with unadjusted or adjusted means??

I want to plot a bar graph of mean weight, but should I plot the mean weight that I obtained from raw data, or do I need to plot the estimated...

• Replies: 0
• Views: 6,480
03-28-2008, 09:44 AM
12. ### How should I statistically analyse this study?

HI, I'm a 3rd year medical student studying in Sydney, Australia. I am currently working at one of the hospitals and am conducting a patient...

• Replies: 1
• Views: 2,349
08-01-2007, 11:24 PM
13. ### Non-probability sampling stuff

Hi there, Sorry probably asking a very basic question but just want to make sure... Am I right in saying that if I have surveyed people using a...

• Replies: 3
• Views: 7,305
09-09-2005, 03:23 PM
14. ### Statistics sample / popoualtion question. CoNFuSeD!?

Imagine a total population of T people, made up a total of M men and F women. T = M + F Now imagine I draw a sample of R people from this...

• Replies: 2
• Views: 2,166
11-26-2008, 02:40 PM
15. ### What statistical test should be used?

I've collected data on the number of individuals of seven species at three different sites and want to test if there is a statistically significant...

• Replies: 0
• Views: 1,080
08-03-2016, 04:37 PM
16. ### Probability Question

suppose a reading between 30 and 40 is called very interesting from an archaeological point of view. let us say you take readings at n=12 sites...

• Replies: 0
• Views: 1,475
10-14-2013, 11:59 PM
17. ### Probability without z-score?

Estimate mean of male students on campus. Standard deviation of the heights of young men is about 2.8 inches. Suppose (unknown to you) the mean...

• Replies: 1
• Views: 3,148
10-05-2011, 12:16 AM
18. ### Help needed in SPSS

Hello ! With a friend, we have a paper to write about the fail of measures to counter the illegal downloading of music in our country, for that...

• Replies: 5
• Views: 380
09-21-2017, 06:41 AM
19. ### Help with calculating significance of the results

Hello, I am doing down-stream analysis of genomic data. I have 'X' number of occurrences in our 2000 gene sequences of interest. I have generated...

• Replies: 8
• Views: 3,314
10-22-2010, 10:32 AM
20. ### p-value cutoff for Wilcoxon rank sum test

Hi all, I am using Wilcoxon rank sum test with continuity correction in order to determine if the differences in boxplot are significant. Does...

• Replies: 2
• Views: 2,595
03-05-2013, 03:10 PM
21. ### Help me out: Computing SE CV SED LSD

Dear All, In calculating standard error of mean (SE) and coefficient of variation (CV) for summary table of means exported to excel from SAS anova...

• Replies: 0
• Views: 9,640
09-13-2006, 08:19 AM
22. ### Stat. Sig of a dollar amount

Need help measuring the statistical significance of when a customer responds to a solicitation, & the size of their purchase. This is a direct...

• Replies: 1
• Views: 2,314
08-24-2007, 10:34 AM
23. ### split halves test

I just read there was something called a split halves test: If you get a 95% or so significance that means youll still be wrong in 5% of the cases....

• Replies: 0
• Views: 2,345
07-24-2007, 05:28 PM
24. ### Computing statistical significance for qualitative data?

In internet marketing there's something called pay per click marketing. You only pay if a user clicks on your ad. You can also test different ads to...

• Replies: 0
• Views: 4,440
07-24-2007, 05:35 PM
25. ### computing a confidence interval for 1 variable / jarque bera test necessary?

Say I have a data sample and want to compute the 95% confidence interval for the mean of this data sample. If the sample is big enough I can...

• Replies: 1
• Views: 5,488
07-24-2007, 05:45 PM
26. ### one-sided vs. two-sided hypothesis test (exp?)

My first language isnt English so hopefully you guys understand what Im trying to say by one-sided vs. two-sided? What I found pretty confusing in...

• Replies: 2
• Views: 4,700
07-25-2007, 11:42 AM
27. ### assuming a variable is/variables are normally distributed

Ive read and also been told on here that if the sample size is > 30 I can assume the variable is normally distributed. I'm wondering if 30 isn't a...

• Replies: 2
• Views: 4,020
08-19-2007, 10:54 PM
28. ### impact of factors of search engine rankings

I read a study that I think is very flawed. It's in German, though and it's probably flawed intentionally by the webmaster, but it raised a question...

• Replies: 5
• Views: 2,935
08-29-2007, 05:59 PM
29. ### Is this a valid approach?

I asked this in another thread, but unfortunately I still don't know whether it's possible to do this or not. I'll keep my question/example as brief...

• Replies: 6
• Views: 2,447
08-30-2007, 03:30 PM
30. ### logistic regression & saturation

I had 2 statistics classes, the first one was about the very very basics not going into detail about regression analysis. However we had diff. kinds...

• Replies: 1
• Views: 3,964
09-03-2007, 10:35 AM
31. ### two auto-correlation questions

Hello, I'm just wondering if I really understand what auto-correlated error terms are: Say I'm looking at time series data of the points per...

• Replies: 3
• Views: 4,071
12-27-2007, 12:16 PM
32. ### Is this a case of auto-correlation?

There's a person (sort of like a mentor) who I send a lot of e-mails to. During certain periods (when I need help) I send him quite a lot of e-mails....

• Replies: 0
• Views: 2,584
01-17-2008, 07:17 PM
33. ### How to prove the magnitude of improvement (two data sets)?

Hi Guys! I am struggling a bit with some statistical validations. Currently using Google Analytics in order to get data from my website. Testing...

• Replies: 2
• Views: 1,081
10-02-2016, 10:36 AM
34. ### Help! I need to use R to calculate a recursive function!

hi,all Z(i)=0.05X(i)+0.95Z(i-1), where i = 1.....32, and X's are given data, the question is how to use r to get the 32 values of Z. I couldn't do...

• Replies: 2
• Views: 2,360
03-09-2010, 11:37 PM
35. ### Simple question about a repeated trial

Say I have a die that I throw an N number of times and I record the distribution of 1s, 2s, .. 6s. Can we say anything about this distribution? Will...

• Replies: 6
• Views: 2,077
02-03-2009, 04:29 PM
36. ### Proof of why this happens

I have a task that I think runs in 2 milliseconds. To judge it's performance, I time it, but the granularity of my timer is 16ms. In other words when...

• Replies: 1
• Views: 2,353
02-05-2009, 07:57 AM
37. ### Simple question about sampling

If I know nothing about a particular distribution, is there a way for me to draw samples from it so as to determine it's characteristics? I'd be...

• Replies: 1
• Views: 1,717
04-11-2012, 09:09 PM
38. ### Help with Managerial report

I have to generate a report and need help with data and its interpretation. Please help - I am using excel and statdisk Data: School Enroll Per...

• Replies: 0
• Views: 2,939
07-31-2008, 12:26 PM
39. ### change of cale, rank correlation SPEARMAN

Hello everybody, I have computed a coeffecient correlation of SPEARMAN for 2 columns number; as you know, the result is between -1 and 1. My...

• Replies: 0
• Views: 1,009
05-02-2013, 03:05 AM
40. ### False positive qustion

Hey All I have a quick question while I was preparing my self to an interview I have , this is the question : What is better :having 10 false...

• Replies: 1
• Views: 1,223
10-28-2016, 07:28 AM
41. ### No S.E. C.R. or p value in my SEM AMOS output

I’m a bit concerned about the fact that I am not getting S.E., C.R or p values for many regressions (in some models). That table will normally ...

• Replies: 0
• Views: 2,461
08-31-2012, 02:14 AM
42. ### Which statistical analysis should be used?

Hello everyone I have seven localities from which I collected different species of plants (small number of species aout 30) I want to include some...

• Replies: 4
• Views: 1,962
12-29-2014, 10:18 AM
43. ### Please, need some help

Dear people, I need some help regarding the following. Hopefully someone can help!! I'm looking at the effect of student employment on grades....

• Replies: 0
• Views: 1,813
11-25-2010, 04:32 AM
44. ### generating variables

I have a variable in the SHARE dataset which is like this: EX026_ TRUST IN OTHER PEOPLE 'Finally' at the beginning of the question text removed. I...

• Replies: 0
• Views: 879
03-04-2013, 08:22 AM
45. ### Question on Normal distributions and sampling distributions

I have the following questions for homework and seem to have hit a roadblock..any help would be apprecieated. 1. A recent statistics exam had a...

• Replies: 0
• Views: 4,835
04-10-2009, 03:52 PM
46. ### Reasons and advantages of using an ANCOVA instead of a Regression

Hello everyone, Just wondering if any of you could help me. Just wondering when the variables I’m using can be used for both ANCOVA and...

• Replies: 1
• Views: 1,880
06-08-2016, 02:46 PM
47. ### Survey Analysis-Test for significance?

Hello, This is my first post to the forum so I hope i am in the appropriate category. I am analyzing satisfaction data for my organization. I...

• Replies: 2
• Views: 4,383
06-12-2010, 12:04 AM
48. ### Largest Number within the lowest 90% of a group of Numbers

How would you go about writing a formula (ideally in excel, access, vba code, etc) that would return the largest number within the lowest 90% of a...

• Replies: 4
• Views: 1,267
02-21-2014, 09:31 AM
49. ### 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: 3,103
01-15-2015, 06:00 AM
50. ### Statistics Help

My question may be very simple but here it is, Find the value of z such that the area under the standard normal curve in teh left tail is 0.05. ...

• Replies: 3
• Views: 3,829
10-21-2008, 12:12 PM
51. ### Stndrd Norm Distrib

For a standardized normal distribution, calculate the following probabilities: a. P(z<1.5) b. P(z_> 0.85) c. P(-1.28< z <1.75) Aren't I missing...

• Replies: 3
• Views: 2,922
10-23-2008, 11:30 AM
52. ### Normal distribution - do it need to test that for Kendall's W

Hello guys, i have a quick question, i am currently conducting my master thesis and am ranking some barriers according to their mean and median...

• Replies: 0
• Views: 1,194
07-29-2013, 04:05 AM
53. ### Factor analysis (pcf) and linear regression

Der all, I've got a general question on factor analysis using principle-component-factors in Stata in order to check for the validity of the...

• Replies: 5
• Views: 1,726
02-12-2015, 09:10 AM
54. ### chi-square test with very uneven binary variable and an ordered variable

Hello everyone, this is probably a quite simple question, yet I would like to ask it here. I want to run a chi-square test between one binary coded...

• Replies: 3
• Views: 1,174
11-26-2015, 03:35 AM
55. ### Box-Cox-Model: How to get p-Values?

:wave: Hello everybody, Does anybody know how to get p<chi2-values for each of the independent variables when running a box-cox model in...

• Replies: 0
• Views: 2,070
08-31-2008, 03:06 PM
56. ### Reduce dummy variables to scores reflecting underlying dimensions

I'm having a set of 34 dummy variables for a little more than 100 obs. I would now like to know what would be an appropriate technique to find out ...

• Replies: 5
• Views: 5,582
06-21-2010, 10:11 AM
57. ### Annotation of bootstrapping

Hi all, I've been asked by reviewers to make the methods section of a paper more formal. The method in short is bootstrapping a probability...

• Replies: 2
• Views: 1,525
12-27-2015, 05:48 PM
58. ### Wilcoxon signed-rank test - Can I use for this case?

Hello guys, I'm trying test if the results of a measurement variable (obtained with observation) is significantly greater than a other (obtained...

• Replies: 0
• Views: 1,760
02-27-2012, 04:41 AM
59. ### Paired t on large data set

This is my first of hopefully many posts. Statistics is not one of my strong points :) I have a question. Below is the output from a paired t-test...

• Replies: 7
• Views: 5,356
12-31-2008, 11:31 AM

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