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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: 196,960
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: 66,858
09-30-2005, 09:44 AM
1. ### CHi square X2 to rule out differences between groups on demographics

Hi I was wondering if someone could please help me understand how Chi square helps me rule out differences between groups on the demographics of...

• Replies: 9
• Views: 14,185
03-08-2014, 09:14 PM
2. ### Degrees of Freedom

Hello, I want to explain the meaning of degrees of freedom to people that are not mathematicians. What should i tell them? More specifically i...

• Replies: 9
• Views: 11,830
07-15-2015, 09:00 AM
3. ### Statistics - Visualization

There is only so much excel, SAS, R, JMP, and whatever software you use can do in terms of helping people understand your data. I want to explore...

• Replies: 9
• Views: 1,962
06-21-2014, 04:46 PM
4. ### Upper Bound Error for Expectation Approximation?

Dear all, I have a problem for the past few weeks and couldn't find the answer in the books or in the internet. I know that in general: E(g(X1,...

• Replies: 9
• Views: 1,464
11-24-2013, 08:38 PM
5. ### How can I analyse this likert scale? Any help would be greatly appreciated

Hi there, I am creating a 20 question questionnaire for my dissertation at university. It is a likert scale questionnaire and I will be using a...

• Replies: 9
• Views: 1,956
10-12-2013, 01:50 PM
6. ### Finding MLE of a transformation

I think calling it a transformation is most accurate, anyways. Let X_1, X_2, \cdots , X_n ~ N(\theta, 1). Define Y_i = 1 if X_i > 0 or Y_i =...

• Replies: 9
• Views: 2,306
11-03-2013, 09:11 PM
7. ### To calculate p value, or not to calculate P vale...?

Hey everyone. I am doing a project comparing development of heel ulcerations from achilles tendon lengthening. I have NEVER taken a statistics...

• Replies: 9
• Views: 2,143
10-30-2013, 12:36 PM
8. ### Test Development -> KMO issue

Issue Hi there, while summarizing the results of a newly developed test I came upon a highly unsatisfactory KMO index while all other measures...

• Replies: 9
• Views: 4,245
01-07-2014, 03:05 PM
9. ### Spearman's correlation: a continuous with a binary variable

Hi everyone. I'm pretty new to statistics so sorry for the dummy question :o I need some nonparametric statistics to correlate a binary variable...

• Replies: 9
• Views: 13,788
12-29-2013, 07:20 AM
10. ### changing a continuous variable into a categorical one - central tendencies as guides

Hi all, This is my first post, I'll try to follow all the guidelines. I searched online, this forum and the FAQs but couldn't find an answer...

• Replies: 9
• Views: 2,629
02-06-2014, 09:29 PM
11. ### Can someone help me in understanding this (t-statistics)?

Hi, I am trying to understand a paper right now that says: Does someone know what this means and how the t-statistics were calculated here? ...

• Replies: 9
• Views: 2,132
02-12-2014, 03:32 AM
12. ### One-sample t-test, is this reasonable?

Hi all, I am asked to construct a one-sample hypothesis testing in my assignment. I have collected data on GDP for 40 African countries, then I...

• Replies: 9
• Views: 1,483
03-17-2014, 09:35 AM
13. ### How do I prove my results are statistically significant or not?

Sorry in advance, I'm a complete statistics novice! I have a three chemical samples which were prepared in exactly the same way, and when tested...

• Replies: 9
• Views: 1,637
04-27-2014, 03:29 PM
14. ### Calculating SD for data with many zeros

Hi all, I have multiple datasets with lots of zeros. Some are counts, others are percentages, but none of them can have negative values. When...

• Replies: 9
• Views: 4,295
05-21-2014, 11:11 PM
15. ### Age as a Dependent variable in 2-way ANOVA?

Hi, I have a dataset comprising of Ages and Genders of patients in two WardUnits. I want to determine if patient Ages differ by WardUnit and...

• Replies: 9
• Views: 2,608
09-05-2014, 10:33 AM
16. ### I need help

I need your help with my univerity project, I am testing awareness of insurance. (Yes/no) againt media internet,newspaper, tv, radios to see if...

• Replies: 9
• Views: 2,541
10-06-2014, 10:49 AM
17. ### I Need Help with Scale of Measurement

I tend to over-think things, and there are multiple items within each part of an assignment I am doing. Any help would be greatly appreciated. :yup:...

• Replies: 9
• Views: 2,224
12-02-2014, 06:36 AM
18. ### Right closed or left closed histograms

What difference does it make if histograms are right closed (left open) or left closed (right open). Please, someone do help me?

• Replies: 9
• Views: 2,452
12-07-2014, 05:34 PM
19. ### Bayes estimator 2

If X ~ Poisson(\theta) and \pi(\theta)~exp(1)(prior). Find the Bayes estimator for P_\theta(X=0) with respect to quadratic loss I calculated the...

• Replies: 9
• Views: 1,850
04-03-2015, 09:42 AM
20. ### 3 values ordinal variable: Mann-Whitney or Chi-squared?

Hello, I have an ordinal variable which assumes only 3 values. I need to do a comparison between 2 treatments. I used Mann-Whitney test, since...

• Replies: 9
• Views: 2,277
02-18-2015, 05:46 AM
21. ### Statistics II Excel Hangups

Hello all, I somehow find myself Statistics II. As a gen-ed student at a community college, this is the final math course required of me and what...

• Replies: 9
• Views: 1,321
02-26-2015, 02:21 PM
22. ### Quick question: Parametric vs Non Parametric

Hi everyone! Just a quick question! I ran a Shapiro-Wilk test for normality and I have some normally distributed data as Age and others as...

• Replies: 9
• Views: 1,691
06-20-2015, 04:55 PM
23. ### What distribution is appropriate for length of a signal (in days)?

I have a vector of "signal lengths", which is the amount of days a signal lasts once initially activated. For the purpose of confidence intervals and...

• Replies: 9
• Views: 1,387
07-29-2015, 06:07 AM
24. ### Confidence Intervals

Hello Everyone, Is it possible to have confidence interval for a probability of 0? For instance, a random sample of 40 persons were asked if they...

• Replies: 9
• Views: 1,153
08-25-2015, 02:12 PM
25. ### Non-proportion percentage as a response

Moderator note: This thread was split from a previous thread as it didn't directly address the question in the previous thread and deserves its own...

• Replies: 9
• Views: 2,250
09-07-2015, 08:37 AM
26. ### Relative risk and statistical significance

Hello everyone, My first post here. I just started a job that requires me to learn some statistics. I've been reading some books but it still...

• Replies: 9
• Views: 2,217
10-17-2015, 10:59 AM
27. ### Comparing response to treatment across two separate *populations*

Hi all, Forgive me if this seems a straightforward question but ive tried in vain to find the answer. I'm doing a medical research project and want...

• Replies: 9
• Views: 2,392
10-16-2015, 10:01 AM
28. ### interpreting layered chi square output

Hello, I was wondering if anyone could help with interpretation of a layered chi square table to look for a confounding variable I am getting...

• Replies: 9
• Views: 2,333
10-12-2015, 04:37 AM
29. ### Difficult problem

Recently James got 2 part-time jobs. The jobs are roster-based. He works at each job in alternate weeks. In office 1, he works in week #1, week...

• Replies: 9
• Views: 2,111
10-16-2015, 03:24 PM
30. ### Correction for attenuation or deattenuation factor

Just stumbled across this and was wondering if others were familiar with it. Also, can someone give me the 10,000 foot overview of what it is about....

• Replies: 9
• Views: 3,862
11-12-2015, 11:57 PM
31. ### Logistic regression interpretation for an idiot

Hi. I'm not a statistician.... more of an statistidiot. I have been trying for some time to understand logistic regression interpretation but am...

• Replies: 9
• Views: 1,597
03-26-2016, 07:37 AM
32. ### Help me with Empirical Methods

Dear Gurus of statistics :wave: I am student in Germany and I have an exam after 2 days from Empirical methods :shakehead ... is it possible that...

• Replies: 9
• Views: 1,850
11-19-2015, 03:08 AM
33. ### trying to understand the t-distribution

In an hypothesis test when we use the sample standard deviation and we assume that the population is normally distributed, we use the following...

• Replies: 9
• Views: 2,254
02-24-2016, 03:17 PM
34. ### Affirmation of Analysis Write-up

Hi all, I am new to this forum and looking for somebody with statistical experience to affirm the write up of my results. I completely understand...

• Replies: 9
• Views: 1,520
02-24-2016, 03:37 PM
35. ### Imputing missing values thanks to correlated data ?

Hello everyone, I'm new here, nice to meet you :) As English is not my native language, I apologise if I'm not always clear, please don't hesitate...

• Replies: 9
• Views: 1,775
04-01-2016, 04:26 AM
36. ### Themes in Survey Response, maybe PCA

I have a sample of 50 respondents to a cross-sectional (identical) survey administer at four time points. The instrument asks the potential...

• Replies: 9
• Views: 2,365
09-15-2016, 02:06 PM
37. ### Standard Uniform Distribution

Hi, how to prove that U~uniform is equivalent to (i.e. if and only if) ~uniform{0,1,2,...,n-1} for all positive integers n. is the floor function. I...

• Replies: 9
• Views: 2,040
10-15-2016, 03:14 PM
38. ### Bemused by student question.

We have taken a simple random sample to estimate the mean of a population. A student asked me - The numbers near the middle of our sample will...

• Replies: 9
• Views: 2,457
10-23-2016, 06:50 PM
39. ### 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: 1,160
05-13-2017, 07:50 AM
40. ### New normed Goodness of Fit Measures ?

Hello everybody! I am currently working on a robust regression problem, where Model R^2 and Spearman correlation recommend different models. ...

• Replies: 9
• Views: 2,692
02-27-2017, 08:51 PM
41. ### I need help figuring out type of analysis for duration of therapy and adverse outcome

Hi everyone, I have a prospective cohort of 90 subjects who were previously on drug X (duration of drug X = "varx"), now on drug Y and followed...

• Replies: 9
• Views: 429
08-29-2017, 02:36 PM
42. ### Analyzing skewed data, how to determine % spread and variation? Testing method error

Hello everyone, I'm trying to determine the overall error of a measurement method by comparing it to the true value. I have a set of data which...

• Replies: 9
• Views: 505
09-06-2017, 11:47 PM
43. ### 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: 2,636
01-31-2015, 04:58 AM
44. ### ANOVA exercise

Hello, My question is: in which way this exercise should be solved? It can't be solved with F test, because there were no given F-test value table...

• Replies: 8
• Views: 1,515
02-12-2015, 08:21 AM
45. ### Maximum Likelihood estimator

If X_1,X_2,....,X_n is a random sample of X with density f(x;\theta)=\frac{\theta}{x^2}I_{ i)Find the estimator of moments and discuss its...

• Replies: 8
• Views: 1,987
BGM
03-17-2015, 04:41 PM
46. ### What test to do to compare means, not fo experimental data, but of real world data

I want to also understand if the test to compare means are meant to be carried out only for experimental data. What about real world data? I...

• Replies: 8
• Views: 1,744
04-13-2015, 03:06 AM
47. ### What statistical analysis to use for a ordinal scale questionnaire?

Dear Experts, Im a noob when it comes to statistics. So please pardon my lack of knowledge in this post. I need to do a statistical analysis on...

• Replies: 8
• Views: 2,254
04-13-2015, 01:15 PM
48. ### Which test can I use here?

I have two different groups, measured over time, continuous variable, two different treatments. I know there is a significant change in both...

• Replies: 8
• Views: 1,313
05-14-2015, 03:48 PM

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