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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread 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...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 145,418
    07-16-2014, 12:01 PM Go to last post
  2. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 10:44 AM
    • Replies: 0
    • Views: 42,377
    09-30-2005, 10:44 AM Go to last post
  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...

    Started by Stem‎, Today 11:44 AM
    • Replies: 0
    • Views: 61
    Today, 11:44 AM Go to last post
  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...

    Started by lightwelter‎, Today 11:12 AM
    • Replies: 1
    • Views: 50
    Today, 11:41 AM Go to last post
  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)....

    Started by szm‎, Yesterday 01:51 PM
    • Replies: 2
    • Views: 93
    Today, 02:54 AM Go to last post
  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.,...

    Started by beccaspends‎, Yesterday 06:01 PM
    probability, statistics
    • Replies: 2
    • Views: 119
    Yesterday, 08:02 PM Go to last post
  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...

    Started by Ifailedinstats‎, Yesterday 03:27 PM
    certainty, homework, stats help, urgent, word problems
    • Replies: 0
    • Views: 85
    Yesterday, 03:27 PM Go to last post
  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...

    Started by kate537‎, Yesterday 11:10 AM
    critical value
    • Replies: 0
    • Views: 65
    Yesterday, 11:10 AM Go to last post
  7. Analysis of data - how to find the most relevant factors

    Solved. Sorry... You can delete it.

    Started by skw‎, 02-25-2017 05:33 PM
    data, data analysis, statistic
    • Replies: 0
    • Views: 121
    02-25-2017, 05:33 PM Go to last post
  8. Can I perfrom Two Way Anova? Also, is it possible to predict chemical percentage?

    Dear Fellow members, I have a data (attached the structure) and each data point is average of 30 observations. In this, I measure the chemical...

    Started by lawrence.slj‎, 02-25-2017 04:42 AM
    • Replies: 3
    • Views: 133
    02-25-2017, 07:48 AM Go to last post
  9. 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. ...

    Started by consuli‎, 02-14-2017 12:01 PM
    • Replies: 8
    • Views: 344
    02-24-2017, 02:47 PM Go to last post
  10. 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...

    Started by Ping Koo‎, 02-23-2017 05:16 AM
    • Replies: 10
    • Views: 249
    02-24-2017, 01:17 PM Go to last post
  11. 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...

    Started by throughstream‎, 02-23-2017 12:51 PM
    • Replies: 0
    • Views: 118
    02-23-2017, 12:51 PM Go to last post
  12. 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...

    Started by shaju304‎, 02-22-2017 10:57 PM
    bayesian, bayesian estimation
    • Replies: 0
    • Views: 123
    02-22-2017, 10:57 PM Go to last post
  13. 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...

    Started by gatorrob86‎, 02-21-2017 01:00 PM
    • Replies: 1
    • Views: 154
    02-22-2017, 08:38 AM Go to last post
  14. Question 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...

    Started by vivid‎, 02-22-2017 08:05 AM
    • Replies: 0
    • Views: 104
    02-22-2017, 08:05 AM Go to last post
  15. 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...

    Started by youngukoo‎, 06-20-2013 03:05 AM
    • Replies: 3
    • Views: 7,646
    02-21-2017, 06:26 PM Go to last post
  16. 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...

    Started by Blueray123‎, 02-21-2017 04:24 PM
    confidence, polls
    • Replies: 0
    • Views: 128
    02-21-2017, 04:24 PM Go to last post
  17. Standard error bar question.

    Im doing a lab on mitosis and have calculated the SE already for all the categories. I am almost certain that when the instructions state (± 2 SE)...

    Started by Rsahu1919‎, 02-21-2017 10:59 AM
    • Replies: 4
    • Views: 177
    02-21-2017, 01:46 PM Go to last post
  18. 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...

    Started by paulcoolvoice‎, 02-21-2017 12:09 PM
    efa, factor analysis
    • Replies: 0
    • Views: 112
    02-21-2017, 12:09 PM Go to last post
  19. 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...

    Started by danrodberg‎, 02-21-2017 03:40 AM
    • Replies: 1
    • Views: 146
    02-21-2017, 08:55 AM Go to last post
  20. 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...

    Started by omega6‎, 02-21-2017 04:15 AM
    • Replies: 0
    • Views: 74
    02-21-2017, 04:15 AM Go to last post
  21. 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 ...

    Started by user1234‎, 02-19-2017 04:52 AM
    hierarchical model, multilevel modeling, r programing, simulation, variance components
    • Replies: 6
    • Views: 240
    02-20-2017, 01:06 AM Go to last post
  22. 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...

    Started by Curtains White‎, 02-18-2017 10:36 AM
    associations, correlation, group differences, spss 23, study design
    • Replies: 2
    • Views: 112
    02-20-2017, 12:31 AM Go to last post
  23. 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...

    Started by Victoria_W‎, 02-17-2017 11:28 AM
    ancova, covariance, factors
    • Replies: 1
    • Views: 89
    02-19-2017, 04:56 PM Go to last post
  24. Which test to use?

    I have come across a circumstance that I wonder if you can guide me in the right direction. There are player rankings or ratings for certain hockey...

    Started by mgattone‎, 02-17-2017 12:22 PM
    • Replies: 1
    • Views: 82
    02-19-2017, 04:56 PM Go to last post
  25. 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 %...

    Started by medicalstatistics‎, 02-18-2017 08:30 AM
    confidence interval, medical statistics
    • Replies: 12
    • Views: 254
    02-19-2017, 04:10 PM Go to last post
  26. 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...

    Started by patricksean‎, 01-25-2017 12:49 PM
    • Replies: 3
    • Views: 372
    02-19-2017, 03:43 PM Go to last post
  27. Calculating a true relative proficiency index

    I want to calculate an accurate relative rating of a typist's skill or proficiency for each key on the keyboard. If I give someone a sample of...

    Started by Jennifer Murphy‎, 02-18-2017 04:45 PM
    • Replies: 1
    • Views: 140
    02-18-2017, 09:12 PM Go to last post
  28. 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...

    Started by yung jabba‎, 02-18-2017 12:35 PM
    • Replies: 0
    • Views: 135
    02-18-2017, 12:35 PM Go to last post
  29. Question 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...

    Started by Graveto‎, 02-17-2017 03:49 PM
    cramer's v, effect size, large df
    • Replies: 1
    • Views: 163
    02-18-2017, 04:46 AM Go to last post
  30. 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...

    Started by wondrousnicholas‎, 02-16-2017 11:35 AM
    • Replies: 3
    • Views: 248
    02-17-2017, 05:14 PM Go to last post
  31. Bland-Altman plot interpretation

    Good afternoon, I am trying to compare humidity levels taken with our old hygrometers vs. our new one. I did some research over the internet,...

    Started by alexiab‎, 02-16-2017 09:06 AM
    • Replies: 13
    • Views: 344
    02-17-2017, 07:56 AM Go to last post
  32. 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...

    Started by mina44‎, 02-16-2017 10:42 PM
    • Replies: 1
    • Views: 159
    02-17-2017, 04:09 AM Go to last post
  33. 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...

    Started by itssingertime‎, 02-16-2017 09:34 PM
    • Replies: 0
    • Views: 142
    02-16-2017, 09:34 PM Go to last post
  34. 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...

    Started by BetsyL94‎, 02-16-2017 10:11 AM
    normality, panel data, regression analysis
    • Replies: 5
    • Views: 153
    02-16-2017, 11:33 AM Go to last post
  35. 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...

    Started by Terry1945‎, 02-16-2017 10:39 AM
    • Replies: 0
    • Views: 168
    02-16-2017, 10:39 AM Go to last post
  36. 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...

    Started by Curtains White‎, 02-15-2017 05:29 AM
    bonferroni correction, kruskal wallis, spss 23
    • Replies: 5
    • Views: 204
    02-16-2017, 09:00 AM Go to last post
  37. 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...

    Started by throughstream‎, 02-15-2017 08:31 AM
    • Replies: 6
    • Views: 208
    02-15-2017, 10:18 PM Go to last post
  38. 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...

    Started by Sabby‎, 02-15-2017 03:57 PM
    • Replies: 0
    • Views: 119
    02-15-2017, 03:57 PM Go to last post
  39. 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: ...

    Started by Götze1989‎, 02-14-2017 11:18 AM
    lognormal, monte carlo, shapiro-wilk test
    • Replies: 2
    • Views: 164
    02-15-2017, 07:53 AM Go to last post
  40. 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)...

    Started by ocomin‎, 02-11-2017 11:44 PM
    • Replies: 2
    • Views: 191
    02-15-2017, 06:49 AM Go to last post
  41. 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...

    Started by Dragonfly‎, 02-13-2017 03:23 PM
    comparing, difference, means, significant, spss
    • Replies: 2
    • Views: 214
    02-15-2017, 05:59 AM Go to last post
  42. 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...

    Started by wcy‎, 02-14-2017 01:08 PM
    • Replies: 2
    • Views: 180
    02-14-2017, 02:38 PM Go to last post
  43. 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...

    Started by PapaGiorgio‎, 02-14-2017 02:31 PM
    • Replies: 0
    • Views: 135
    02-14-2017, 02:31 PM Go to last post
  44. 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...

    Started by jascareer29‎, 02-14-2017 09:56 AM
    • Replies: 1
    • Views: 168
    02-14-2017, 10:05 AM Go to last post
  45. 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...

    Started by user1234‎, 02-14-2017 04:55 AM
    biostatistics, cox proportional hazard, hazard function, kaplan-meier, survival analysis
    • Replies: 0
    • Views: 72
    02-14-2017, 04:55 AM Go to last post
  46. 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...

    Started by Aleckandre98‎, 02-13-2017 09:30 PM
    • Replies: 1
    • Views: 188
    02-14-2017, 03:39 AM Go to last post
  47. 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...

    Started by meltvariant‎, 02-13-2017 02:33 PM
    • Replies: 3
    • Views: 227
    02-13-2017, 04:55 PM Go to last post
  48. Need Help breaking down a formula

    I'm having trouble getting my head around this formula. I've always had a rough time with them and I don't understand why Sigma is on the right side...

    Started by Pasdeseul‎, 02-13-2017 12:49 PM
    • Replies: 1
    • Views: 160
    02-13-2017, 02:17 PM Go to last post
  49. 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...

    Started by Curtains White‎, 02-12-2017 01:29 PM
    nominal variables, spss 23, x2 test
    • Replies: 2
    • Views: 236
    02-13-2017, 02:25 AM Go to last post
  50. 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...

    Started by Palermo‎, 02-12-2017 08:50 PM
    • Replies: 0
    • Views: 157
    02-12-2017, 08:50 PM Go to last post
  51. 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...

    Started by Curtains White‎, 02-12-2017 08:46 AM
    non parametric tests, normal distribution, parametric tests, spss 23
    • Replies: 1
    • Views: 171
    02-12-2017, 09:00 AM Go to last post
  52. 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...

    Started by raju1‎, 02-02-2017 06:11 PM
    • Replies: 2
    • Views: 249
    02-12-2017, 08:57 AM Go to last post
  53. 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,...

    Started by Curtains White‎, 02-11-2017 11:47 AM
    chi-square test, fisher exact test, spss
    • Replies: 2
    • Views: 231
    02-12-2017, 08:38 AM Go to last post
  54. 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...

    Started by one1‎, 02-11-2017 04:54 PM
    bayesian inference
    • Replies: 0
    • Views: 168
    02-11-2017, 04:54 PM Go to last post
  55. 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...

    Started by Ornat‎, 02-10-2017 03:26 PM
    paired sample; t-test
    • Replies: 0
    • Views: 185
    02-10-2017, 03:26 PM Go to last post
  56. 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...

    Started by Rotterdam‎, 01-27-2017 10:16 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 801
    02-10-2017, 11:21 AM Go to last post
  57. 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...

    Started by RasmusGreen‎, 02-07-2017 11:42 AM
    continous variable, dichotomous, mann-whitney, pearson's r, point-biserial
    • Replies: 7
    • Views: 263
    02-10-2017, 11:09 AM Go to last post
  58. How Do I interpret this? M=5.99, SD=1.16, n+34, range =1 to 17

    what does this mean?

    Started by Deanabrown36‎, 02-08-2017 09:08 PM
    • Replies: 3
    • Views: 267
    02-08-2017, 11:58 PM Go to last post
  59. Question 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! ...

    Started by amandaq‎, 02-08-2017 07:38 PM
    • Replies: 0
    • Views: 178
    02-08-2017, 07:38 PM Go to last post
  60. 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...

    Started by Bmi‎, 02-08-2017 01:52 PM
    sample size calculation
    • Replies: 0
    • Views: 172
    02-08-2017, 01:52 PM Go to last post

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