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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 11:13 AM
    • Replies: 1
    • Views: 131,873
    07-16-2014, 11:01 AM 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 09:44 AM
    • Replies: 0
    • Views: 37,383
    09-30-2005, 09:44 AM Go to last post
  1. Calculating probabilities over time?

    Hello, I'm looking to learn how to calculate probability of an event happening over time. The easiest way to express it is in a dice analogy. I...

    Started by Ferg Deluxe‎, Today 01:45 PM
    • Replies: 1
    • Views: 3
    Today, 01:48 PM Go to last post
  2. Generating rates: individual level or aggregate??

    I have a dataset that contains infraction committed by students during their stay in a school. I want to see the rate of infractions per 100 days...

    Started by Marvin85‎, Today 01:18 PM
    aggregate, rates
    • Replies: 0
    • Views: 15
    Today, 01:18 PM Go to last post
  3. Repeated measures anova?

    Hey guys i am struggling to decide on the correct test I should run for the following design: I am comparing one treatment and one control...

    Started by kasperski‎, 09-19-2016 10:52 AM
    • Replies: 5
    • Views: 159
    Today, 12:01 PM Go to last post
  4. Need Help Understanding Calculation of Printed Circuit Board Design Time

    First post here. If it's not appropriate or needs moved, I apologize. FWIW, this is not a homework problem... I'm in need some help understanding...

    Started by mbeaver‎, 09-22-2016 10:26 AM
    • Replies: 3
    • Views: 125
    Today, 09:39 AM Go to last post
  5. Sampling.

    Suppose any body interested to take up a study on healthcare utilization by differently able person, say he/she has resources for sample of size 100...

    Started by Suvamoy‎, Yesterday 12:02 PM
    • Replies: 1
    • Views: 88
    Today, 08:44 AM Go to last post
  6. Function output difference

    I have two 'unknown' functions that I need to test the check if there is any difference in their outputs. In the easiest case the output is...

    Started by kataka‎, Today 06:31 AM
    • Replies: 0
    • Views: 44
    Today, 06:31 AM Go to last post
  7. Question regarding conditional probability. Did I get this correct when explaining?

    Hello, I'm constantly getting my conversations marked off because I'm not writing exactly what the teacher wants. Here is the question that was...

    Started by dbrantley64‎, 09-24-2016 02:55 PM
    • Replies: 1
    • Views: 109
    09-24-2016, 05:52 PM Go to last post
  8. Question Can Variance be used as an output variable?

    For example, in an experiment the output data (y axis) becomes more dispersed as some input variable (x axis) is changed. So if there seems to be a...

    Started by jarvis‎, 09-22-2016 05:37 AM
    dhglm, gamlss
    • Replies: 6
    • Views: 160
    09-24-2016, 10:52 AM Go to last post
  9. Question Good source for post hoc test selection?

    Hi all - How do I select the most appropriate post hoc (post ANOVA) test? It's data from a normal distribution, 4 groups, experimental data from...

    Started by jarvis‎, 09-23-2016 11:21 AM
    • Replies: 0
    • Views: 70
    09-23-2016, 11:21 AM Go to last post
  10. p-value

    Can someone please help me understand what this means in plain english? The p-value = 2 x < .001, and the results are highly significant. Am I...

    Started by kdsan‎, 09-22-2016 12:31 PM
    • Replies: 6
    • Views: 171
    09-23-2016, 08:55 AM Go to last post
  11. Exclamation SOS-Where to begin on this complex data set and what Stat Model to use?

    Hi Everyone, This is my first time EVER posting anything on the web for help, so here it goes. Recently I applied for a job and they sent me...

    Started by sandiegon8tive‎, 09-22-2016 06:18 PM
    • Replies: 0
    • Views: 86
    09-22-2016, 06:18 PM Go to last post
  12. Best statistics textbooks to read to tackle this type of exam?

    The prescribed textbook we use is our course at ANU is Keller, I have read the book and did most of the end of chapter questions. But the lecturer...

    Started by financialwar‎, 09-22-2016 07:24 AM
    • Replies: 2
    • Views: 109
    09-22-2016, 05:52 PM Go to last post
  13. Which model to use?

    Hi all, I am attempting to model some data but it has been a while since I completed my masters so my statistical skills are not what they used to...

    Started by Manj999‎, 09-22-2016 05:15 AM
    • Replies: 0
    • Views: 63
    09-22-2016, 05:15 AM Go to last post
  14. Is Paired T-test the right tool to use?

    Hi! I want to know whether the paired t-test can be used when the variables for comparison are different (but measuring similar constructs and on...

    Started by Leona‎, 09-21-2016 08:59 PM
    • Replies: 1
    • Views: 80
    09-21-2016, 10:58 PM Go to last post
  15. Help with Correlation

    Hello! I need help for an issue i have. Let's assume that we have data of two variables (X and Y) for 14 different people. We can find the...

    Started by m1chael‎, 09-21-2016 06:26 AM
    correlation, multiple
    • Replies: 10
    • Views: 168
    09-21-2016, 06:26 PM Go to last post
  16. Understanding: Mean Square Treatments ~ Mean Square Error If Null Hypothesis is True

    I am having difficulty understanding how the Mean Square Treatments should be approximately the same as the Mean Square Error if the null hypothesis...

    Started by negodfre‎, 09-21-2016 09:12 AM
    • Replies: 0
    • Views: 66
    09-21-2016, 09:12 AM Go to last post
  17. HELP! Manipulation of a survey question to a Value

    I got a result of survey asking "What percentage of banking applications are designed for mobile access today? where the answers can be -Under 5%,...

    Started by yoni‎, 09-21-2016 01:49 AM
    • Replies: 0
    • Views: 75
    09-21-2016, 01:49 AM Go to last post
  18. Thumbs up Central tendency in stattistic:

    If anyone want to calculate or estimate average age of people of a country (say India) what will be the appropriate method- mean, median or mode and...

    Started by Suvamoy‎, 09-20-2016 07:06 AM
    • Replies: 5
    • Views: 131
    09-20-2016, 12:45 PM Go to last post
  19. finding percentile from z-score

    I have this question which i am so confused how to solve it this is on normal curve. The following table is used to determine the student’s...

    Started by x509‎, 09-19-2016 09:51 PM
    • Replies: 1
    • Views: 105
    09-20-2016, 06:24 AM Go to last post
  20. Standard Dev Question

    Hey guys! Could you guys help with these questions? 1.Which of the two histograms has the larger mean? Explain? 2.Which of the two histograms has...

    Started by collegekid5‎, 09-18-2016 09:56 PM
    • Replies: 3
    • Views: 161
    09-19-2016, 06:05 AM Go to last post
  21. Difference in proportion for large sample size

    Hi, I have 2 proportions from 2 years: P1(2001): 11000/12500 = 88.0% P2 (2002): 11500/12800 = 89.8% I am interested in knowing if there is a...

    Started by pazuuu‎, 09-18-2016 04:36 AM
    • Replies: 3
    • Views: 110
    09-18-2016, 09:33 AM Go to last post
  22. F-Statistic

    I'm trying to understand the intuition behind the F-Statistic. In ISLR: F=(TSS-RSS)/p /RSS/(n-p-1) The numerator is described as the "between...

    Started by droma3‎, 09-15-2016 09:11 AM
    f statistic
    • Replies: 5
    • Views: 220
    09-18-2016, 04:17 AM Go to last post
  23. Are the parametric analyses appropriate?

    In an experimental study, the aesthetic value (independent var) of a picture is manipulated into (low and high quality). "Low Quality" -- to make it...

    Started by uxk8396‎, 09-15-2016 07:08 PM
    anova, manova, regression analysis
    • Replies: 0
    • Views: 113
    09-15-2016, 07:08 PM Go to last post
  24. Confidence Interval Estimate Between Two Means

    Hello all. New user, first time poster, but this looks like a community that can help me learn. I am taking a statistics course and I am at a...

    Started by bvbull200‎, 09-15-2016 05:08 PM
    • Replies: 0
    • Views: 107
    09-15-2016, 05:08 PM Go to last post
  25. 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...

    Started by hlsmith‎, 09-15-2016 09:45 AM
    • Replies: 9
    • Views: 159
    09-15-2016, 02:06 PM Go to last post
  26. Cope with distributions that may take negative numbers

    Hi to everyone, I would like to know how to cope with distributions that may take negative numbers when it is physically impossible. For instance,...

    Started by davidvansan‎, 09-13-2016 04:48 PM
    2 Pages
    1 2
    non-negative, normal
    • Replies: 16
    • Views: 340
    09-15-2016, 09:27 AM Go to last post
  27. Standard Error of Coefficient w/1 Independent Variable

    Hi- I'm studying regression via ISLR and trying to manually calc a standard error for a data set to better understand the intuition. Below is my R...

    Started by droma3‎, 09-13-2016 10:53 AM
    • Replies: 2
    • Views: 122
    09-15-2016, 09:03 AM Go to last post
  28. Which hypothesis test to use

    I'm doing an assignment and am just a bit rusty and confused. I don't want the answer to the question, just guidance on what sort of test to use. ...

    Started by alldaybrkfst‎, 09-14-2016 05:25 AM
    • Replies: 2
    • Views: 110
    09-14-2016, 09:40 AM Go to last post
  29. Student T-Test on Area Sizes and P-Value significance

    Hello. I am running a t-test. 2 groups, group 1 is a area size of a vein before intervention and the second is a vein after intervention. Some...

    Started by kozak94‎, 09-13-2016 08:10 PM
    • Replies: 1
    • Views: 96
    09-14-2016, 09:26 AM Go to last post
  30. Assess statistical significance of two PPVs

    I recently validated a medical diagnosis in order to compose a study population. To do so, we classified each patient with a diagnosis of interest as...

    Started by marsh_randy‎, 09-13-2016 09:23 AM
    difference, positive predictive value, test of significance, validation
    • Replies: 2
    • Views: 118
    09-13-2016, 01:57 PM Go to last post
  31. Degrees of Freedom for linear combination of VarianceComponents

    I was trying to figure out satterthwaite's degrees of freedom for the combination of variance component to calculate confidence interval. I can...

    Started by dsj‎, 09-13-2016 01:27 PM
    variance components
    • Replies: 0
    • Views: 71
    09-13-2016, 01:27 PM Go to last post
  32. Which ANOVA to use? one-way repeated measures ANOVA test, or a two-way multi-variate

    Problem 1 Research Question 1: What effect does providing captions while learners are watching a video have on their comprehension of the video? ...

    Started by jamestoffee‎, 09-13-2016 08:00 AM
    • Replies: 1
    • Views: 93
    09-13-2016, 09:32 AM Go to last post
  33. Unhappy (too) small sample size?

    Without going into too much detail: I have a number of people every year. At one point, something happens that makes the yearly number of people...

    Started by tessa001‎, 09-12-2016 01:11 PM
    help me, online course, statistics
    • Replies: 1
    • Views: 160
    09-13-2016, 02:22 AM Go to last post
  34. ikelihood

    hello, I have a question about the topic ikelihood. In the literature, the likelihood function is used for the estimation of the parameters, and in...

    Started by andrew_fg‎, 09-12-2016 05:12 AM
    ikelihood
    • Replies: 1
    • Views: 141
    09-12-2016, 05:25 PM Go to last post
  35. Likert Survey -- Stat for comparing single items and sub categories

    Hello, For my dissertation I am using an existing 50 item Likert survey. I am pretty sure I will use a t-test to determine if there are...

    Started by mlewisstats‎, 09-12-2016 01:57 AM
    difference, likert, t-test
    • Replies: 1
    • Views: 92
    09-12-2016, 03:40 AM Go to last post
  36. Data Extrapolation for SEM

    Hi, I have a data of n=50. Is there any way in which I can extrapolate or simulate the data to n=2000, in order to carry out Structural equation...

    Started by alexpjoy‎, 08-17-2016 05:56 AM
    • Replies: 4
    • Views: 251
    09-07-2016, 03:10 PM Go to last post
  37. Biased and Unbiased Variance

    Hello everyone, I did an binomial experiment to flip 10 coins and count the total number of heads.This was repeated 200 times.However at the end...

    Started by Miguelogy‎, 09-07-2016 04:03 AM
    • Replies: 3
    • Views: 149
    09-07-2016, 07:04 AM Go to last post
  38. Can a non-baseline variable be used as a co-variate in ANCOVA?

    Dear All, I have a question related to selection of covariates in ANCOVA analysis. I understand that baseline covariates can be selected based...

    Started by placebo‎, 09-07-2016 04:21 AM
    • Replies: 0
    • Views: 127
    09-07-2016, 04:21 AM Go to last post
  39. Question is a standard deviation value valid when n is 2?

    is a standard deviation value valid when n is 2?

    Started by KHoss‎, 09-06-2016 05:05 PM
    • Replies: 3
    • Views: 199
    09-06-2016, 08:23 PM Go to last post
  40. Interpretation of 99% confidence interval

    Hello guys, this is my first post here in the forum and if I missed anything, then pls correct me. My first statistic class starts this week...

    Started by 7thSlap‎, 09-06-2016 10:32 AM
    • Replies: 8
    • Views: 181
    09-06-2016, 04:09 PM Go to last post
  41. Comparing counts with chi square test of homogeneity

    Hi! I need to compare the results of two computer simulations in order to establish their equivalence. Each simulation result (actually it is the...

    Started by deusex‎, 09-06-2016 04:57 AM
    • Replies: 0
    • Views: 139
    09-06-2016, 04:57 AM Go to last post
  42. Paired Sample T-Test, Bivariate Correlation, Factors Influencing Resistance to Change

    Hi there, My study investigates factors that influence resistance to change in an organisation. The independent variables are: trust,...

    Started by GioiaD‎, 09-06-2016 01:56 AM
    bivariate correlations, paired sample t-test, pearsons correlation, spss, stepwise regression
    • Replies: 0
    • Views: 117
    09-06-2016, 01:56 AM Go to last post
  43. Law of Large numbers(turning pen experiment)

    Hello everyone, My class did an turning pen experiment in class,where we turn a pen 5 times eventually, each time there is a possibility of the...

    Started by Miguelogy‎, 09-05-2016 10:44 AM
    • Replies: 4
    • Views: 231
    09-05-2016, 11:46 PM Go to last post
  44. Examine the effect of one independent var

    Hi, I want to examine the effect of still images (independent var) with two levels (monochromatic and multi-color) on mood perception (dependent...

    Started by uxk8396‎, 09-05-2016 07:32 PM
    anova, regression analysis, statistical analysis
    • Replies: 0
    • Views: 116
    09-05-2016, 07:32 PM Go to last post
  45. calculate the standard error of the mean

    To whom it may concern: I have a cognition experiment which has 10 subjects. Each subject performs 400 trials. My advisor wants me to...

    Started by Jay Chen‎, 09-04-2016 09:15 PM
    standard error of mean
    • Replies: 2
    • Views: 187
    09-05-2016, 09:41 AM Go to last post
  46. Sampling Technique and Sample Size

    Hi, I intend to estimate household level gas consumption for a city with a population of 1 million and 200,000 houses through a survey. The city...

    Started by has70‎, 09-02-2016 02:13 PM
    • Replies: 3
    • Views: 183
    09-03-2016, 08:36 PM Go to last post
  47. N particles in 2 boxes - distinguishable/indistinguishable - probability association

    Hi there I'm new here, I have this question on my homework that has been bugging me for a couple of days now and I was wondering if anybody could...

    Started by koalabear‎, 09-03-2016 05:55 AM
    mechanics, physics, statistics, thermodynamics
    • Replies: 1
    • Views: 157
    09-03-2016, 08:50 AM Go to last post
  48. Partial Autocorrelation Function

    Hello everyone, I am preparing for a test and I have came across a question I am having problems with: Calculate partial autocorrelation of...

    Started by Lukasz_‎, 09-03-2016 05:45 AM
    arima, autocorrelation, timeseries analysis
    • Replies: 0
    • Views: 111
    09-03-2016, 05:45 AM Go to last post
  49. Fisher's exact test - two-tailed

    Hi guys, I performed a fisher's exact test on Genstat and got this result: One-tailed significance level 0.563 Mid-P value 0.371 Two-tailed...

    Started by mgzx‎, 09-03-2016 04:28 AM
    fisher's exact test, p-value, two-tailed
    • Replies: 1
    • Views: 107
    09-03-2016, 05:26 AM Go to last post
  50. Question about permutations ANOVA test

    Hello everyone, I have data of a variable from 4 sites, with 3 repetitions from each site. Tests revealed that I do have homoscedasticity but no...

    Started by Royan‎, 08-31-2016 06:31 AM
    anova, permutation, repetitions
    • Replies: 8
    • Views: 234
    09-02-2016, 05:31 AM Go to last post
  51. Survey Results Help

    Hi, We did a survey of our staff in March and had 23 respondents. We redid the exact same survey in July with 19 respondents. We would like to...

    Started by VPLe‎, 08-31-2016 05:10 PM
    • Replies: 1
    • Views: 180
    09-01-2016, 02:31 PM Go to last post
  52. ICC analysis: per trial, per condition on per patient?

    Hi everyone, I have a question relative to an ICC analysis. I want to compare 2 methods to assess motor blocks occurring during walking in...

    Started by Mur‎, 09-01-2016 07:43 AM
    • Replies: 0
    • Views: 105
    09-01-2016, 07:43 AM Go to last post
  53. Can I use a pearson correlation with repeated measures?

    I have measured 5 different behavioural responses of birds to birdsong playbacks from a speaker (e.g. how long they took to sing back to the playback...

    Started by shardman‎, 08-29-2016 11:00 AM
    correlation, pearson
    • Replies: 5
    • Views: 180
    08-30-2016, 05:35 PM Go to last post
  54. bounds on the value of the SD

    I learned stats in a very applied, algebra-based way...so for those of you who've taken a series of more rigorous stats courses, this will likely be...

    Started by bruin‎, 08-29-2016 04:56 PM
    • Replies: 5
    • Views: 197
    08-30-2016, 12:22 AM Go to last post
  55. Calculating chi-squared statistic in Excel

    Folks I've carried out a chi-squared test on the following observed and expected values using the CHISQ.TEST function in Excel: Observed: 176,...

    Started by Remster‎, 08-29-2016 12:02 PM
    • Replies: 3
    • Views: 149
    08-29-2016, 06:45 PM Go to last post
  56. Insignificant correlation - significant regression

    I couldn't find this on the search - maybe it's too basic ;) So I have two variables which significantly positively correlate with each other (r =...

    Started by Rec‎, 08-29-2016 12:13 PM
    • Replies: 1
    • Views: 130
    08-29-2016, 01:10 PM Go to last post
  57. Statistical method to compare urban vs rural matched siblings

    I am writing a study protocol for my masters thesis. The study seeks to compare the rates of Non Communicable Diseases and risk factors and determine...

    Started by rectus‎, 08-29-2016 01:37 AM
    compare groups
    • Replies: 1
    • Views: 129
    08-29-2016, 10:19 AM Go to last post
  58. index of variability

    Hi I have objects and each object have given precentages of their appearances in different situations. For example: object 1 20% 40% 30% 5%...

    Started by luida‎, 08-11-2016 05:19 PM
    • Replies: 2
    • Views: 287
    08-29-2016, 05:34 AM Go to last post
  59. A/B Split Testing - How to factor in cost?

    Hi guys! I'm looking for advices in the application on an A/B split test calculator. Hopefully we can solve this problem together... Here goes: ...

    Started by Zeth‎, 08-26-2016 02:32 AM
    • Replies: 1
    • Views: 164
    08-28-2016, 04:28 PM Go to last post
  60. Hypothesis Test

    n=45 sample mean = 17.1 sample std dev = 6.4 What is the probability that the sample mean differs from the true mean by 2 or more? Thanks in...

    Started by AntonChigurh‎, 08-16-2016 12:21 PM
    • Replies: 3
    • Views: 214
    08-27-2016, 04:33 PM Go to last post

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