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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: 196,734
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: 66,739
09-30-2005, 09:44 AM
1. ### Which model for a discrete count with under-dispersed data

Dear All, I am working on the specific effects of poverty on farmers adaptive capacity in sub-saharan Africa (N=1211). In bivariate, two of my...

• Replies: 0
• Views: 912
04-30-2015, 07:30 AM
2. ### How to calculate the sample size

Hello every one, How can i calculate the sample size of the test. for example- I made 16 samples and 1 failed. I have been tasked to...

• Replies: 3
• Views: 1,971
04-30-2015, 12:40 AM
3. ### Out of control signal

True or False: An out of control signal indicates that either the process mean has shifted or that the standard deviation has changed

• Replies: 1
• Views: 1,086
04-29-2015, 12:38 PM
4. ### Conducting Factor Analysis on Data with Nominal, Ordinal, and Interval Data

I would advice on conducting a confirmatory factor analysis on data from an instrument that contains nominal, ordinal, and interval data. I'd think...

• Replies: 0
• Views: 1,944
04-29-2015, 12:07 PM
5. ### standard error question

Suppose after performing a random experiment, it comes out that exactly 3 out of 20 to 30 year old males are shorter than 5.5 feet. consider the...

• Replies: 0
• Views: 551
04-29-2015, 08:24 AM
6. ### sample distribution question

The distribution of height of 20 to 20 year old males in normal with mean 5.8 feet and sd of .3 feet. random samples of size 16 A)what is the...

• Replies: 0
• Views: 755
04-29-2015, 08:22 AM

Suppose after performing a random experiment, it comes out that exactly 3 out of 20 to 30 year old males are shorter than 5.5 feet. consider the...

• Replies: 1
• Views: 1,595
04-29-2015, 02:05 AM
8. ### stats homework help

I could really use some help on this! you measure the serum total cholesterol levels in a random sample of 9 people. the sample mean in 192 and...

• Replies: 1
• Views: 1,639
04-29-2015, 01:48 AM
9. ### Stuck on stats homework

1. Last month a random sample of 1000 subjects were interviewed and asked whether they think the president is doing a good job. This month the same...

• Replies: 2
• Views: 3,876
04-28-2015, 03:17 PM
10. ### Fourier Transformation

Hello every one, Is there a simple way to learn Fourier Transformation , and some examples with excel templete Thanks, Harbi

• Replies: 0
• Views: 1,377
04-28-2015, 02:12 PM
11. ### Sum up Items with very different scales?

Imagine I have the following Items Items 1a, 1b. All of them can have a range from 0 to infinite, but most likely Items 1a has a range from 0-20 and...

• Replies: 0
• Views: 988
04-28-2015, 07:49 AM
12. ### A question about Spearman's Rank and Mean Values

Hello, I'm not entirely sure I've put this in the correct forum... This is possibly a daft question, but I have used SPSS to calculated...

• Replies: 2
• Views: 834
04-28-2015, 04:54 AM
13. ### Multiple regression: Why does a new control variable make an old one insignificant?

Okay guys, I've tried Googling this, but I couldn't really find any good results. I've made a regression analysis of attitudes towards gender...

• Replies: 12
• Views: 2,990
04-27-2015, 05:33 PM
14. ### Deriving mean and variance from a loss distribution

Hi guys! I need to derive the mean and variance of two different loss distributions: L1 = -10000*(exp(R_t,t+10)-1) L2 = -10000*R_t,t+10 ...

• Replies: 0
• Views: 746
04-27-2015, 04:27 PM
15. ### One-way repeated measures ANOVA help

Hello, I am trying to compare the relationship between two variables at 3-5 different time points (ie. at each time point both variables were...

• Replies: 0
• Views: 682
04-27-2015, 03:51 PM
16. ### help with nonparamatric repeated measures analysis

Hi. I have a set of measures repeated for ten consecutive days in 11 subjects (diaphragm thickness) and a within-subject effect with 3 different...

• Replies: 0
• Views: 795
04-27-2015, 12:24 PM
17. ### Comparing percentages data

Hi there! :wave::wave: I have two sets of data: each is composed of percentages (the percentage of dead cells in different samples of cells). I...

• Replies: 1
• Views: 1,192
04-27-2015, 03:05 AM

Hi, I have a homework question that uses the Simpsons characters as a way to illustrate the Simpsons Paradox: Consider Homer and Bart's...

• Replies: 1
• Views: 2,367
04-26-2015, 12:47 PM
19. ### Comparing two groups - which test?

Hi guys! I'm totally lost and in need of help. I don't have much knowledge in stats, and Google couldn't help me out this time. I have two...

• Replies: 4
• Views: 1,517
04-26-2015, 06:53 AM
20. ### Conditional distribution of Poisson Process

Hi, A portion of the problem I am working on requires that I find the conditional expectation of X(1) given X(2)=1. Now since we are dealing...

• Replies: 1
• Views: 881
BGM
04-26-2015, 01:30 AM
21. ### SPCA analysis to reduce dimentionality?

I'm a complete newbie to this, and would much appreciate any help. I have a large set, 400K+ items, each has 2000 descriptor values. I need to...

• Replies: 0
• Views: 1,407
04-25-2015, 09:37 PM
22. ### Transformation of variable - does it still have a continuous distribution function

Hi all. I would appreciate your help because I cannot seem to find the answer for the following question. I will describe what I have, what I want...

• Replies: 0
• Views: 854
04-25-2015, 02:57 PM
23. ### Sufficient statistics and maximum likelihood

Find a maximum-likelihood estimator for a in the density f(x;a)=\frac{2}{a^2}(a-x)I_{(0,a)}(x) for samples of size 2.Is it a sufficient statistic? ...

• Replies: 1
• Views: 1,071
04-25-2015, 07:06 AM
24. ### Cohen's d Value with Insignificant t Test

A B 42 43 45 51 40 56 37 40 41 32 41 54 48 51 50 55 45 50

• Replies: 3
• Views: 1,627
04-25-2015, 04:47 AM
25. ### Sample proportion 3 questions

I have a homework question but i am not sure what the answer is. I have a clue to what the formula is but I cant seem to get the right answer. ...

• Replies: 4
• Views: 1,269
04-24-2015, 06:51 PM
26. ### Correlations - What is the best measuring test?

Hi everyone, I'm an MS candidate for a Human Resources program so my question may sound pretty basic. I'm trying to prove that Millennials...

• Replies: 0
• Views: 988
04-24-2015, 05:59 PM
27. ### Fixed vs. Random effects for clustered data

Hello, My question is about interpreting "Sargan-Hansen statistic results" using xtreg, re and xtoverid in STATA. I have three models each...

• Replies: 0
• Views: 1,568
04-24-2015, 12:19 PM
28. ### Discriminant Analysis? Or something else?

Hi guys, This is my homework question. I would appreciate if i could get some idea of where i'm wrong. Determine whether the variables Smoking,...

• Replies: 1
• Views: 1,986
04-24-2015, 07:12 AM
29. ### Help with research model

I am in need of a quick statistical advice for a study I planned, and I hope you can help me a bit with it. I'd really appreciate your expertise....

• Replies: 0
• Views: 506
04-24-2015, 04:42 AM
30. ### Stuck at std error, two mean values (indep pop avgs) of continuous numerical data

Hello All, non-numerate scientist here with a statistics question regarding the comparison of two mean values (independent population averages) of...

• Replies: 1
• Views: 850
04-24-2015, 02:08 AM
31. ### non parametric multiple pairwise comparisons - which correction is allowed?

Hello all, I have a data set from plant experiments with only 4 replicates. data are numbers of mites after different treatments. Because the...

• Replies: 2
• Views: 1,214
04-24-2015, 01:33 AM
32. ### Panel Data Regression Results

My regression results give me this : What I'm confused about is, is there something wrong in my data that resulted in the almost 0 standard...

• Replies: 0
• Views: 1,094
04-23-2015, 11:42 PM
33. ### Calculating a confidence interval when the sample size is unknown

The problem that I am trying to solve is the following: ...A standardized test is used to assess the students knowledge (national reported...

• Replies: 1
• Views: 1,486
04-23-2015, 09:45 PM
34. ### PROCESS or regression?

Hi, I am a bit confused about this problem. I would appreciate if i could get some help. Conduct the analysis necessary to answer the following...

• Replies: 0
• Views: 881
04-23-2015, 07:11 PM
35. ### Appropriate Grouping of Data

I have a problem where there is a control and experimental group. Each group has 2 subjects and each of the subjects has 5 replicate values. I...

• Replies: 6
• Views: 1,366
04-23-2015, 03:14 PM
36. ### Ergm

Hii Does anyone knows how to add attribute to edges in ERGM R model? Tank you

• Replies: 0
• Views: 695
04-23-2015, 11:38 AM
37. ### Help! Choosing test to compare means between two groups w/ multiple variables

Hi everyone! I work for a non-profit that recently conducted a food security and livelihood assessment of Ebola-affected communities. We sampled...

• Replies: 1
• Views: 1,043
04-22-2015, 10:14 AM
38. ### Recommendations for statistical models with scale and nominal data

Hi everyone! I've recently rejoined the world of academia and have to get back into using stats. When it comes to descriptive stats, I don't have...

• Replies: 1
• Views: 1,247
04-22-2015, 10:12 AM
39. ### Cronbach's alpha superlow on pretests, superhigh on posttests (?!)

Dear Stats Wizards, I am a doctoral student at Georgetown University. I am finishing my dissertation and computed the item reliability of my...

• Replies: 2
• Views: 5,417
04-22-2015, 06:02 AM
40. ### choosing the right statistical test for comparing data, when do you use which test

Hello all, I would like some feedback on the right approach of analysing data, comparing means of groups of data. Currently I work with the...

• Replies: 13
• Views: 1,993
04-22-2015, 03:31 AM
41. ### Social Statistics help please

I am really stuck on these 2 problems, if you can help me out i would appreciate it very much. 1. How to sell a burger: A fast-food chain wants to...

• Replies: 1
• Views: 2,857
04-22-2015, 02:57 AM
42. ### Kappa to Assess Interrater Reliability

Hi All, I would like to assess the inter-rater reliability of a diagnostic measure. My sample will include 20 participants, with the same two...

• Replies: 3
• Views: 1,632
04-22-2015, 02:53 AM
43. ### good books covering both parametric and non parametric statistics tests

Hello all, What would be the best book as a reference on both parametric and non parametric tests. I'm looking for a practical applied book with...

• Replies: 0
• Views: 973
04-22-2015, 01:34 AM
44. ### Need design help...not sure how to analyze

Hi, I am writing a proposal in which I am trying to implicitly activate a stereotype. Specifically, I want to see if professional sexy attire (not...

• Replies: 0
• Views: 948
04-21-2015, 03:29 PM
45. ### Statistical significance of results in observational study

Hello all, this is my first post. I am seeking some advice on the following study. A group of students is rated on how many questions they ask in...

• Replies: 3
• Views: 928
04-21-2015, 01:47 PM
46. ### hep please...would using spearman or pearson would be correct

Hi all May be this is a dumb question but I need quick help please I have data for 95 people Outcome scored by doctors as excellant(4),...

• Replies: 5
• Views: 1,823
04-21-2015, 08:36 AM
47. ### How to find correlation coefficients for periodic data?

I am working on a hedging model for commodity.I have past 36 months data of commodity market price and future contracts price. e.g. on 1st...

• Replies: 0
• Views: 1,239
04-21-2015, 01:28 AM
48. ### Quick question

Hey everyone, I'm having some trouble with a Intro to Stat question I have for homework. I'm hoping someone can help me out with this. I'm not...

• Replies: 1
• Views: 1,200
04-20-2015, 10:03 PM
49. ### Z test

My Intro Stats book mentions about inferring a population mean from a sample when a population standard deviation known, "a Z test". For a Z...

• Replies: 2
• Views: 1,592
04-20-2015, 04:36 PM
50. ### Z Score

Calculate the z-score to determine the probability that the stock price for Firm A will fall below a penny (i.e., \$0.01). Firm A mean of 1.58 with a...

• Replies: 6
• Views: 1,711
04-20-2015, 11:08 AM
51. ### Whether normal distribution models are time independent or not?

A random variable(such as void sizes ) depending on manufacturing methods can follow normal or log normal distribution. To justify these two arising...

• Replies: 1
• Views: 782
04-20-2015, 10:28 AM
52. ### Help need to decide what stat test to use.

For my dissertation I am investigating the effect of zinc nano particles in plant growth. I want to test for significance in the change in plant...

• Replies: 2
• Views: 1,619
04-20-2015, 08:42 AM
53. ### SPSS - ICC (consistency or absolut agreement?)

Hello, I am calculating the agreement between the data (mean wave amplitude) obtained through two different methods (intracranial and lumbar route)....

• Replies: 0
• Views: 2,656
04-20-2015, 06:34 AM
54. ### One-Way repeated Measures ANOVA: how to follow up main effects?

Hi all, I run a One Way Repeated Measures ANOVA to compare color differences means on SPSS. I have a within-subjects factor with 7 levels and a...

• Replies: 1
• Views: 1,242
04-19-2015, 01:00 PM
55. ### Inter-Rater Reliability for Diagnostic and Continuous Measure

Hi All, I am hoping to compute the inter-rater reliability (IRR) of a diagnostic measure and a continuous screening measure. For the...

• Replies: 4
• Views: 1,173
04-19-2015, 12:45 AM

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