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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: 145,418
07-16-2014, 12:01 PM
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: 42,377
09-30-2005, 10:44 AM
1. A method sensitivity 1:10^3 or 1:10^5

I am developing a PCR method to assess A cell contamination in B cells population. A cell express a large amount of C gene, but B cell only express...

• Replies: 0
• Views: 61
Today, 11:44 AM
2. Reliability question

I am doing some research at the moment using something called transcranial magnetic stimulation, which involves delivering stimulation to the area of...

• Replies: 1
• Views: 50
Today, 11:41 AM
3. standard error of quadratic estimate

Hi all, I want to estimate the value of an independent variable X (temperature in F) that maximized my dependent variable Y (pressure in bars)....

• Replies: 2
• Views: 93
szm
Today, 02:54 AM
4. Basic probability help

Mechanical Engineering reported on the need for wireless networks to monitor the quality of industrial equipment. For example, consider Eaton Corp.,...

• Replies: 2
• Views: 119
Yesterday, 08:02 PM
5. Help its urgent!

Q1)A certain stimulus administrated to each of the nine patients resulted in the following increase in blood pressure: 5,1,8,0,3,3,5,-2,4 Can it be...

• Replies: 0
• Views: 85
Yesterday, 03:27 PM
6. critical value X 2r

Find the critical value X 2R corresponding to a sample size of 19 and a confidence level of 99% if the test is two-tailed. I am lost on how to...

• Replies: 0
• Views: 65
Yesterday, 11:10 AM
7. Analysis of data - how to find the most relevant factors

Solved. Sorry... You can delete it.

• Replies: 0
• Views: 121
skw
02-25-2017, 05:33 PM
8. 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: 8
• Views: 344
02-24-2017, 02:47 PM
9. Some IVs are normally distributed but some aren't, how to deal with it?

Hi there, In my study I had two groups of people (depressed patient vs. healthy control) and I compared their neural physiologic activity (EEG...

• Replies: 10
• Views: 249
02-24-2017, 01:17 PM
10. Diagnostic test- sample size

Hi I wish to work out a sample size to compare two types diagnostic test for accuracy (Sensitivity and specificity). The diagnostic tests are similar...

• Replies: 0
• Views: 118
02-23-2017, 12:51 PM
11. Imdb top 250 and bottom 100 calculation

https://en.wikipedia.org/wiki/IMDb#Ranking The above page describes how the top 250 is calculated where the m (prior) value is set at 25000 for...

• Replies: 0
• Views: 123
02-22-2017, 10:57 PM
12. Analyzing 3 qualitative (categorical) variables

I have a data set with 4 values per record. Product, Location, Month of Year, Units Sold. I am trying to determine for each product if location...

• Replies: 1
• Views: 154
02-22-2017, 08:38 AM
13. Comparison of averages

Hi, I'm hoping this is a very basic question for someone. I am comparing some statistics from a private language school over two years: In...

• Replies: 0
• Views: 104
02-22-2017, 08:05 AM
14. what is quasibinomial distribution?

I've done some search, but still can't understand what quasibionmial distribution is. Can anyone give me an intuitive explanation? What is a...

• Replies: 3
• Views: 7,646
02-21-2017, 06:26 PM
15. Confidence level?

A poll of 80,000 like minded people is taken. The sample is 400. It is a yes or no poll. The results are 395 Yes and 5 No. What can be deduced from...

• Replies: 0
• Views: 128
02-21-2017, 04:24 PM
16. Help with Exploratory factor analysis

Hello, I am running exploratory factor analysis (EFA) to explore the existence of possible structures within my sample and I have managed to...

• Replies: 0
• Views: 112
02-21-2017, 12:09 PM
17. Question

Hi :) please help me this one :D For data that can be modeled with normal distributions, our basic model takes the form Y ∼ N(Xβ, V ), where Y is...

• Replies: 1
• Views: 146
02-21-2017, 08:55 AM
18. Grouping and comparing

Dear forum members, I'm kind of a noob when it comes to statistics :rolleyes: Currently I'm working on a research project where I use SPSS to...

• Replies: 0
• Views: 74
02-21-2017, 04:15 AM
19. difference between estimating variance and standard deviation.

In a simulation study, is there any difference between \bullet to estimate the variance \sigma^2, 1000 times and taking its average, and ...

• Replies: 6
• Views: 240
02-20-2017, 01:06 AM
20. associations and correlation VS Group differences

Hello to all Talk Stats members! I would really appreciate your help on an issue that's really troubling me... In a previous post of mine I talked...

• Replies: 2
• Views: 112
02-20-2017, 12:31 AM
21. ANCOVA - conflicting results, how to code test

I carried out a group project on a uni field course looking at whether a species' vigilance was affected by whether or not there were young in the...

• Replies: 1
• Views: 89
02-19-2017, 04:56 PM
22. Confidence interval: true or false?

We have measured the concentration cesium-137 in the tissue of 15 tunafish. We may consider the distribution as normal distribution and a 95 %...

• Replies: 12
• Views: 254
02-19-2017, 04:10 PM
23. chi squared (hermit crabs and pieces of plastic)

Good day all, new to this and stats overall so I hope i phrase this appropriately one of our students created an experiment to look at the...

• Replies: 3
• Views: 372
02-19-2017, 03:43 PM
24. Need Help: sports statistics

Hi , I am looking for a formula or an exel formula to rank professional athletes 2016 season statistically. In football, a cornerback has a rating...

• Replies: 0
• Views: 135
02-18-2017, 12:35 PM
25. How can I intepret the effect sizes of Cramer's V when DF is high (like > 20)?

Dear All, I am doing Pearson Chi Square analyses in SPSS. Besides looking at the Chi Square Sig. value I also want to look at Cramer's V to analyze...

• Replies: 1
• Views: 163
02-18-2017, 04:46 AM
26. HELP: Too Basic Of A Stats Question

Hello, I am a physician with a decent amount of experience with clinical research, but am stumped on what statistical test to run on this basic...

• Replies: 3
• Views: 248
02-17-2017, 05:14 PM
27. Methods for visualizing the association between a dichotomous vs. categorical

Type of dependent variable (y variable) vs. type of independent variable (x variable) The question: for the association between a dichotomous vs...

• Replies: 1
• Views: 159
02-17-2017, 04:09 AM
28. Hypothesis Testing: population and samples

Hello and thank you so much in advance for your help! My question has to do with hypothesis testing, specifically in regards to population and...

• Replies: 0
• Views: 142
02-16-2017, 09:34 PM
29. Normality question

Hi everyone. I am doing a panel data project. One of the key factors is unemployment. The dependent is program enrollment. Unemployment is not...

• Replies: 5
• Views: 153
02-16-2017, 11:33 AM
30. How to calculate a confidence interval for the % difference of means for 2 groups?

I have 2 sets of independent (unpaired) continuous data and want to show the relative difference between their means (i.e group B mean is 40% of...

• Replies: 0
• Views: 168
02-16-2017, 10:39 AM
31. How to do a bonferroni correction after Kruskal Wallis H

Hello everyone! My knowledge in statistics being very poor, I would like to ask for your valuable help! Wanting to check any differences between...

• Replies: 5
• Views: 204
02-16-2017, 09:00 AM
32. Confidence intervals with sensitivity and specificity

Hi I'm reading a journal that displays there sensitivity and specificity with 95% confidence intervals however I struggling to see how they worked...

• Replies: 6
• Views: 208
02-15-2017, 10:18 PM
33. Stopping rules for cross-sectional phone surveys?

Hi, I am part of a group who is deploying a phone survey. We're stratifying by age and sex. The sampling frame doesn't exist so we're using RDD to...

• Replies: 0
• Views: 119
02-15-2017, 03:57 PM
34. Sum of log normals not log normal; Monte Carlo Simulation

The Problem is this: Let X1, X2 be two normaly distributed R.V. with equal Variance sigma, expectation 0 undCorrelation Rho. I Would like to: ...

• Replies: 2
• Views: 164
02-15-2017, 07:53 AM
35. Normal Distribution help

Fill in the blank. Suppose you have a normal distribution N(5,1), i.e. µ=5, σ = 1 a) ~68% of observations will fall between _____ and _____ . b)...

• Replies: 2
• Views: 191
02-15-2017, 06:49 AM
36. Comparing whether there is a significant difference between 3 numbers. Help please!!

Hi, So I have lots of participants for whom I have created a score for on three levels. For each participant, I am trying to find out whether...

• Replies: 2
• Views: 214
02-15-2017, 05:59 AM
37. Compare two means without raw data

Hello. I have some questions. I have two groups of subjects, let say group A and group B. Group A: I have the raw data of group A. There are 80...

• Replies: 2
• Views: 180
wcy
02-14-2017, 02:38 PM
38. Help with stats for surgery research

hey everyone, first time poster here. I used to be a stats geek but four years of medical school and five years of residency have helped wipe that...

• Replies: 0
• Views: 135
02-14-2017, 02:31 PM
39. Test to use for discrete Y and continuous X

Hello, I need to determine if there is a relationship between an independent variable that is continuous (in seconds) and dependent variable that is...

• Replies: 1
• Views: 168
02-14-2017, 10:05 AM
40. Rewriting integration by summation

Suppose that n individuals have lifetimes represented by random variables T_1, T_2, \ldots, T_n. Instead of the observed values for each lifetime, we...

• Replies: 0
• Views: 72
02-14-2017, 04:55 AM
41. Binomial Distribution confusion

Hi, I'm currently confused on a question and don't quite understand how to solve it. The question is Suppose 75% of all households with telephone...

• Replies: 1
• Views: 188
02-14-2017, 03:39 AM
42. Picking an appropriate ANOVA, assigning factors

Hi all. I recently performed a simple ANOVA on my data, but I think doing so was not quite right. What I'm attempting to do is (1) determine whether...

• Replies: 3
• Views: 227
02-13-2017, 04:55 PM
43. Which test to use except x2 for nominal variables

Dear TalkStatsers, I've been puzzling my head all weekend as to what statistical test I should use for the following question; "Who do you think...

• Replies: 2
• Views: 236
02-13-2017, 02:25 AM
44. 2 way and 3 way interaction

Can anyone explain why a two way interaction only becomes significant when a third factor is introduced. For eg. Time*Treatment ns p=0.2...

• Replies: 0
• Views: 157
02-12-2017, 08:50 PM
45. Doing Parametric Tests without normal distribution

Hello everyone! Is it true that when your sample is more than 30 people, you can do parametric tests, even though your sample may not follow the...

• Replies: 1
• Views: 171
02-12-2017, 09:00 AM
46. the statistical normality test

I have sample in my assignment and that is paired . when I did normality test through sas I had p value .0001 how do we consider whether this...

• Replies: 2
• Views: 249
02-12-2017, 08:57 AM
47. Which test in Spss is appropriate for my case

In my questionnaire I had the 5 scale likert type question “How whould you evaluate new technologies?” (1: entirely negative, 2: relatively negative,...

• Replies: 2
• Views: 231
02-12-2017, 08:38 AM
48. Bayesian inference with MCMC numeric calculation

I need help with this Bayesian inference problem: Basketball team players are shooting balls in a game with the statistics of X = {(ki, ni)}. ki is...

• Replies: 0
• Views: 168
02-11-2017, 04:54 PM
49. Paired sample t-test?

Here is the problem. I conducted a small pilot research on multicultural differences in the perception of giftedness. I asked my students, half...

• Replies: 0
• Views: 185
02-10-2017, 03:26 PM
50. Pool data and compare data for my systematic review

Hello everybody, I am new to this website and to statistics as well. Currently I am writing a systematic review on complications and reoperations...

• Replies: 21
• Views: 801
02-10-2017, 11:21 AM
51. Point-biserial correlation when some of the test assumptions is violated

Hi! I originally posted my question on StacExchange-CrossValidated, but no one there seems to be able to answer my question. This is the...

• Replies: 7
• Views: 263
02-10-2017, 11:09 AM
52. How Do I interpret this? M=5.99, SD=1.16, n+34, range =1 to 17

what does this mean?

• Replies: 3
• Views: 267
02-08-2017, 11:58 PM
53. demonstrate that 3 sequences are equally likely to occur when tossing a coin 10 times

Hi, I am in an intro to stats class and I am totally lost. Please explain as I said I have no idea what to do. Thanks for your help in advance! ...

• Replies: 0
• Views: 178
02-08-2017, 07:38 PM
54. Sample size in a lot with clumped error

Hi, A big bag is emptied in X amount of smaller bags. We are trying to detect an error which is clumped. In other words, if an error is detected into...

• Replies: 0
• Views: 172
Bmi
02-08-2017, 01:52 PM

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