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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: 197,211
    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: 66,986
    09-30-2005, 09:44 AM Go to last post
  1. What is the population parameter of interest? When the responses are normal?

    The problems said: Students in Stanford are supposed to spend on average 3 hours of time per week for every credit hour they take. Last year, 263...

    Started by crazymartin‎, 02-05-2016 08:34 PM
    parameter, population, samples, statistic
    • Replies: 1
    • Views: 2,966
    02-06-2016, 01:55 AM Go to last post
  2. Significance between two populations

    Hello, I'm sure the answer to this is obvious but I've hit a wall. I'm trying to determine if there's a statistical difference in bird...

    Started by Pajaros‎, 02-04-2016 06:59 PM
    • Replies: 3
    • Views: 1,207
    02-05-2016, 10:51 AM Go to last post
  3. Convert access data base to spss

    I have a access database of Diabetes project. So in one sheet of Access is all clinical details of first visit and in sheet 2 there are details of...

    Started by neha_sharma‎, 02-04-2016 06:14 AM
    • Replies: 1
    • Views: 1,341
    02-04-2016, 05:01 PM Go to last post
  4. Question Best way to calculate couple frequency

    Hi all, Francesco's writing from Italy. I cannot solve this problem that seems quite easy: I've got a list of tests that are made of x colors....

    Started by sanbaldo‎, 02-04-2016 10:52 AM
    • Replies: 0
    • Views: 701
    02-04-2016, 10:52 AM Go to last post
  5. question indirect least squares, turning matrices into a system of equations

    Hi everyone, I am studying indirect least squares method and cannot figure out how to create a system of equations from my matrices. Help is much...

    Started by parsec2011‎, 01-27-2016 03:55 PM
    • Replies: 3
    • Views: 1,436
    02-03-2016, 02:31 PM Go to last post
  6. Response time - what is the best central tendency measure?

    I have a bunch of people working under me. I give them some tasks to complete on a regular basis. Some of the tasks are time bound and some aren't. ...

    Started by Broxigar‎, 02-02-2016 11:14 PM
    central tendancy, descriptive statistics
    • Replies: 3
    • Views: 1,812
    02-03-2016, 11:22 AM Go to last post
  7. Intro Stats Problem.

    A student takes a true or false test with 15 questions. He guesses on every question. 1) Find the probability that he gets atleast 1 question...

    Started by stats151‎, 02-02-2016 06:01 PM
    combinations, math, permutations, stats
    • Replies: 7
    • Views: 2,068
    02-02-2016, 08:15 PM Go to last post
  8. Post Any Suggestions A Good Discussion Topic For An Online Intro Statistics Course

    I'm teaching an online Intro Statistics Course for the first time. This week my Discussion Forum Topic is "How will Statistics be important in the...

    Started by mathprof‎, 02-02-2016 05:36 PM
    discussion, forum, online, topic
    • Replies: 0
    • Views: 1,545
    02-02-2016, 05:36 PM Go to last post
  9. Repeated Measures - Maximum number of variables

    I know that the general rule of thumb is that you need 10 observations or 10 cases per variable in your model. How about in a repeated measures...

    Started by Nives_ES‎, 02-01-2016 12:23 PM
    design of experiments
    • Replies: 3
    • Views: 1,744
    02-01-2016, 02:28 PM Go to last post
  10. proc reg vs. proc genmod

    How do you decide which one to use? I noticed genmod didn't give me an R^2.:confused: You can't give a class statement with proc reg but if you...

    Started by StatsClue‎, 01-01-2012 04:25 PM
    • Replies: 7
    • Views: 12,265
    02-01-2016, 01:08 PM Go to last post
  11. Percentage of agreements

    Hi guys! So I'm working on my thesis and my supervisor told me to check per person, the percentage of agreements (so I can single out single...

    Started by Esbes93‎, 02-01-2016 10:53 AM
    • Replies: 0
    • Views: 1,110
    02-01-2016, 10:53 AM Go to last post
  12. Lightbulb Student Dissertation - Data analysis - Which method should I choose?

    Hello Everyone, My research consists of quantitative questionnaires to the age group (18-24) aiming to reflect on Physical Education in the UK and...

    Started by Shane Sports‎, 02-01-2016 10:08 AM
    #data #analysis
    • Replies: 0
    • Views: 573
    02-01-2016, 10:08 AM Go to last post
  13. Smile White ^ Black balls

    Hi guy's, I tryed to figure out couple of weeks how to solve a statistic problem with white and black balls.I kindly ask you if you can help me a...

    Started by abby‎, 01-28-2016 05:24 PM
    • Replies: 5
    • Views: 2,148
    01-31-2016, 03:44 PM Go to last post
  14. 10$ for solving 2 questions

    Dear Experts, I am a undergraduate student and till tomorrow I have to solve this (graded) exercise. For you this exercise might be very easy. ...

    Started by cfdreen‎, 01-31-2016 02:26 AM
    • Replies: 6
    • Views: 1,800
    01-31-2016, 03:05 PM Go to last post
  15. Screening of categorical variables

    hi i am working on a data set which had 36 categorical variables mostly nominnal and 4 continuous variables . These are all predictor variables ....

    Started by shamit123‎, 01-31-2016 06:39 AM
    • Replies: 1
    • Views: 657
    01-31-2016, 08:41 AM Go to last post
  16. average and SD for averge values with SD

    Hi guys, Hope I could find my answer here, since I've been trying to figure it out for quite sometime... Lets say that I am measuring the...

    Started by snadav‎, 01-25-2016 02:27 PM
    • Replies: 1
    • Views: 955
    01-30-2016, 03:27 AM Go to last post
  17. ANOP / ANOMP: what if n_i * p_i < 5 for one i and n_i * p_avg >> 5 ?

    I'm constructing ANOMP/ANOP graphs to follow-up inspectors in a steel factory. In literature (eg The analysis of Means, Peter R. Nelson) they...

    Started by peter_c‎, 01-29-2016 03:34 AM
    anomp, anop, large sample size, normal approxiamation
    • Replies: 0
    • Views: 839
    01-29-2016, 03:34 AM Go to last post
  18. Question about the Standard Error of the Mean

    Hello all, I'm not an expert in statistics. Suppose i have an instrument that measures temperature with tolerance interval in a measurement 5 C....

    Started by jorgebr‎, 01-28-2016 05:28 PM
    • Replies: 1
    • Views: 1,699
    01-28-2016, 06:32 PM Go to last post
  19. Exclamation Comparing Audit and Re-audit - can statistical analysis be performed?

    Hi There I would be very grateful for all the advice I can get please. I performed a re-audit where I retrospectively examined the medical...

    Started by skaur‎, 01-28-2016 02:12 PM
    • Replies: 0
    • Views: 972
    01-28-2016, 02:12 PM Go to last post
  20. Question Calculating Variance Explained by Effect: High Intercept Sum of Squares Problem

    Hi :) Context: I'm using G*Power to conduct a post hoc power analysis. The study design is a 2x2 Two-Way ANOVA. ANOVA was done in SPSS. ...

    Started by KSnider‎, 01-28-2016 12:21 PM
    anova, effect variance, g*power, intercept, sum of squares
    • Replies: 0
    • Views: 1,382
    01-28-2016, 12:21 PM Go to last post
  21. Categorical data in SEM using AMOS. How can results be interpreted?

    I'm very new in SEM and I'm concerned about the reliability of Bayesian estimation of categorical variable in AMOS; then, if it is reliable, how can...

    Started by MatteoCrist‎, 01-28-2016 09:02 AM
    amos, bayes estimation, categorical data, sem, spss
    • Replies: 0
    • Views: 913
    01-28-2016, 09:02 AM Go to last post
  22. Statistics without individual subjects

    Hi all My situation is that I'm going to run an experiment on food behavior. I have a canteen with a buffet available and I'm going to do a...

    Started by AndreasRJ‎, 01-28-2016 05:43 AM
    • Replies: 0
    • Views: 1,031
    01-28-2016, 05:43 AM Go to last post
  23. Question classification of statistical analysis types

    Hi! I'm writing literature review article in which I describe several reaserches including types of statistical analysis used by authors. As I'm not...

    Started by bmotyka‎, 01-27-2016 04:44 PM
    • Replies: 2
    • Views: 3,371
    01-27-2016, 08:28 PM Go to last post
  24. Project Idea - Intro Statistics Class

    I'm a freshman in college now and I'm taking an intro statistics course. We have a final project for this class, and we need to decide on our own...

    Started by kashyapa‎, 01-16-2015 03:47 PM
    basic, class, data collection, project
    • Replies: 1
    • Views: 3,570
    01-27-2016, 05:08 PM Go to last post
  25. Mixed Repeated Measures and Independent Measures One-Way ANOVA [SPSS]

    Hello, I am trying to determine the best way to carry out my one-way ANOVA in SPSS. I have three groups: Pre-Surgery, Post-Surgery, and...

    Started by biomechL‎, 01-27-2016 04:56 PM
    anova, independent measures, repeated measure anova, spss
    • Replies: 0
    • Views: 1,203
    01-27-2016, 04:56 PM Go to last post
  26. [Excel/SPSS] - How to compare group homogeneity (2 variables)

    Hey dear forum members, it's my first time here, so a big hello to everyone reading this. First of all, I hope my headline gave you a clear idea...

    Started by sammelkorn‎, 01-21-2016 06:17 AM
    homogeneity tests, linguistics, two variables
    • Replies: 5
    • Views: 1,264
    01-27-2016, 05:16 AM Go to last post
  27. TTEST vs Logistic Regression

    I have seen some posts here with the same title but I believe my problem is different: I am unsure whether to conduct a 2 sample ttest or a...

    Started by Nives_ES‎, 01-26-2016 11:07 AM
    categorical, continuous, logistic, ttest
    • Replies: 1
    • Views: 1,722
    01-26-2016, 12:45 PM Go to last post
  28. formula for performing t test for linear regression mean response

    Hi. I am going over my note for stat class and in the chapter for simple linear regression I encountered this: Hypothesis Tests for Mean Response at...

    Started by november‎, 01-24-2016 05:01 AM
    • Replies: 2
    • Views: 1,515
    01-26-2016, 08:42 AM Go to last post
  29. Combining two estimates to minimize MSE

    I am struggling finding the formula for minimizing the Mean Squared Error by placing optimal weights on two estimates. When I place equal weights, I...

    Started by BigBugBuzz‎, 01-25-2016 04:14 PM
    minimizing mse
    • Replies: 1
    • Views: 1,260
    01-26-2016, 04:53 AM Go to last post
  30. Interpreting coefficients in pooled cross-sectional data with cluster-dummies

    Data: pooled cross-sectional data. 6 countries. 3 years of cross sectional data (10 year gaps in between), with different samples of individuals in...

    Started by Stropharia‎, 01-25-2016 10:14 PM
    cross-sectional, fixed effects model, regression coefficients
    • Replies: 0
    • Views: 1,024
    01-25-2016, 10:14 PM Go to last post
  31. CI for a known median survival time without individual subjects data

    Hi All, I need to calculate the 95% CI for a median overall survival of 10 months out of 30 patients, assuming an exponential distribution. No...

    Started by statter‎, 01-25-2016 07:19 AM
    • Replies: 4
    • Views: 1,153
    01-25-2016, 01:06 PM Go to last post
  32. Formally reporting parameter estimates of a covariate (age) of an ANCOVA

    The research questions for my dataset are whether there is an initial visual processing deficit in developmental coordination disorder? And if so...

    Started by Kim Zachon‎, 01-25-2016 07:02 AM
    • Replies: 1
    • Views: 1,249
    01-25-2016, 08:48 AM Go to last post
  33. compute mean square error from summary statistics

    Hi, I have a 2 by 3 repeated measures design, but only the mean, standard deviation and sample size for each cell in the design. I can compute the...

    Started by warrencm‎, 01-22-2016 10:38 AM
    • Replies: 4
    • Views: 1,478
    01-25-2016, 08:44 AM Go to last post
  34. Calculate the interval (from sample of movie budgets)

    Hello guys i have a problem with understanding what to do? task goes like this: Based on the shape of the distribution estimate the percentage of...

    Started by tapessi‎, 01-24-2016 12:45 PM
    • Replies: 0
    • Views: 763
    01-24-2016, 12:45 PM Go to last post
  35. Confidence interval of a mean difference

    Hi all, can someone refresh me on the process to do the following. Based on data that was published in a thesis: A within subjects...

    Started by dreamweaver888‎, 01-23-2016 02:27 AM
    • Replies: 2
    • Views: 1,118
    01-23-2016, 02:38 PM Go to last post
  36. Getting Beta from the output produced by SPSS

    Hello everyone, I'm currently doing a statistical analysis for a course and I'm stuck! We are trying to test for a mediation effect (which is not...

    Started by TiUResearch‎, 01-23-2016 06:35 AM
    • Replies: 0
    • Views: 954
    01-23-2016, 06:35 AM Go to last post
  37. Time series[comparison over time]Thesis defense questions. Need your opinions please

    Hi, I`am going to be defending my thesis in two weeks. My thesis is basically about Information technology usage per individuals in my country. I...

    Started by johnny1355‎, 01-22-2016 02:09 PM
    • Replies: 1
    • Views: 1,387
    01-22-2016, 06:01 PM Go to last post
  38. impose internal coherence (positive definite) on a matrix

    how do I turn a matrix which bears the resemblance of a variance covariance matrix into a "positive definite" matrix (=a usable var cov matrix) ? ...

    Started by shredder11‎, 01-22-2016 09:30 AM
    covariance, positive definite, turn, variance
    • Replies: 2
    • Views: 1,244
    01-22-2016, 02:52 PM Go to last post
  39. Comparing 2 groups of categorical data - chi, fishers exact or something else?

    Hi There I would be very grateful for all the advice I can get please. QUESTION 1 I retrospectively examined the medical notes for 55 patients...

    Started by skaur‎, 01-22-2016 06:12 AM
    • Replies: 2
    • Views: 943
    01-22-2016, 07:05 AM Go to last post
  40. Dataset for college project

    I am a college math teacher and I was assigned to teach a statistics course. I must create a project for my students in which they will have to...

    Started by SWeiss‎, 01-21-2016 06:08 PM
    • Replies: 1
    • Views: 940
    01-21-2016, 06:19 PM Go to last post
  41. which test for a 2-way repeated measures design with multivariate data in Matlab or R

    Hello, I have one of the annoying 'which test'? questions. I have trivariate metric data (x1,x2,x3) from a repeated measures design with 2...

    Started by marohde‎, 12-28-2015 02:18 PM
    matlab, multivariate data, repeated measures design, statistical inference
    • Replies: 2
    • Views: 1,686
    01-21-2016, 11:58 AM Go to last post
  42. moderated regression analysis: help would be awesome.

    What I know: -1 IV standardized ''rating/score scale''(? ) variabel -1 Iv coded (1/-1) dichtomous -1 Dep. rating scale mean -something called a...

    Started by Eggcelent‎, 01-21-2016 08:16 AM
    • Replies: 1
    • Views: 1,328
    01-21-2016, 08:49 AM Go to last post
  43. Chi Square 1x2 degrees of freedom?

    Good Morning, I have what I hope is a simple question. If I am running a chi square test 1x2 -- I cannot use 0 degrees of freedom when...

    Started by SiobhanRoisin‎, 01-21-2016 06:43 AM
    • Replies: 2
    • Views: 1,805
    01-21-2016, 08:47 AM Go to last post
  44. Standard Deviation bessel correction

    Hello friends. I can't seem to find the last piece in my puzzle. If you take a look at my general script here: I'm having all the right...

    Started by Bingo_Bongo‎, 01-20-2016 02:59 PM
    • Replies: 1
    • Views: 2,312
    01-20-2016, 07:39 PM Go to last post
  45. need urgent help :/

    Dear All, just had a question from my teacher and don't know how to begin. What are the most productive branches of economies around the world...

    Started by gkozak‎, 01-19-2016 12:33 PM
    • Replies: 3
    • Views: 1,651
    01-20-2016, 07:02 PM Go to last post
  46. Are two sources of variation ever completely independent?

    Pick three values to represent the true value, and two error sources and put them as the header in separate columns. Remember to include a positive...

    Started by CuriousJohn‎, 01-20-2016 03:18 PM
    independence, variance
    • Replies: 1
    • Views: 1,203
    01-20-2016, 03:54 PM Go to last post
  47. When should a time series model be used

    Consider the following scenario: i have a set of responses y(t),y(t-1),.....y(1), where Y's are continuous and fall between , and "t" is the...

    Started by pemfir‎, 09-29-2015 09:02 PM
    regression analysis, time series forecast, time series regression
    • Replies: 1
    • Views: 1,205
    01-20-2016, 07:13 AM Go to last post
  48. Non Significant ANOVA results - need to explain why.

    I was given data to work on for a lab report. I did a 2 x 2 between subjects ANOVA (if it matters n=187). Main effect of IV1 was not significant....

    Started by Lunachyld‎, 01-19-2016 09:40 PM
    anova, interaction, non-significant, results
    • Replies: 4
    • Views: 1,635
    01-20-2016, 05:22 AM Go to last post
  49. Test to identify bias in staff recording data - some guidence please

    Hi, First post on this forum. Have tried to search for the correct answer in this forum, but have not found it (perhaps I'm not searching correctly)...

    Started by PeterHOZ‎, 01-19-2016 09:58 PM
    anova, bias
    • Replies: 0
    • Views: 927
    01-19-2016, 09:58 PM Go to last post
  50. Help Needed Quickly on Original but Simple Research

    Hello everybody! I recently conducted research where I ran protein powders through a spectrophotometer which gave out concentration values to...

    Started by Proteindude‎, 01-19-2016 06:09 PM
    • Replies: 0
    • Views: 1,067
    01-19-2016, 06:09 PM Go to last post
  51. Estimation

    There's school elections. A guy, asked 8 people and he realized that he had 25% support. Confidence level is 95%. So 25%+(or -) **,**. And **,**=? I...

    Started by icantsolve‎, 01-18-2016 10:38 AM
    • Replies: 2
    • Views: 1,443
    01-18-2016, 03:44 PM Go to last post
  52. Fisher's Exact Test 1x2 ( P1<>P2 ) Calculation

    Good Morning, I am wanting to code to run a Fishers Exact Test on a 1x2 table where I specify the expected frequencies of each of my two...

    Started by SiobhanRoisin‎, 01-18-2016 06:39 AM
    • Replies: 0
    • Views: 2,774
    01-18-2016, 06:39 AM Go to last post
  53. Euclidean distance comparison weighted by correlation

    Hello, I want to calculate the Euclidean distance between two objects across a set of n variables. For those n variables I have generated a...

    Started by theyjamin‎, 01-17-2016 06:52 PM
    correlation matrix, euclidean distance
    • Replies: 0
    • Views: 1,416
    01-17-2016, 06:52 PM Go to last post
  54. Pearson or T?

    Trying to finish my science fair, so after reading a number of the posts, this may be way beneath you, but if you're bored or need community service...

    Started by Meljayskye‎, 01-17-2016 07:51 AM
    • Replies: 3
    • Views: 1,499
    01-17-2016, 05:21 PM Go to last post
  55. Multiple intervention groups for meta-analysis help

    Hi everybody I'm conducting a meta-analysis, and some papers have 2 or 3 intervention groups in addition to the control. I read that I should...

    Started by glassman365‎, 01-16-2016 04:47 AM
    control group, meta-analysis, split observations
    • Replies: 2
    • Views: 1,910
    01-16-2016, 06:47 PM Go to last post
  56. Statistics for regional disease risk factors

    Hi, I've data set collected from 700 sheep farms from 5 regions of England (north, south, East, West, Central). The aim is find out if climate...

    Started by Jojo2015‎, 12-20-2015 06:25 PM
    biostatistics, multivariate analysis, poisson regression, statistical analysis
    • Replies: 2
    • Views: 1,678
    01-16-2016, 05:48 PM Go to last post
  57. Unhappy changing frequency of data

    Is it acceptable in PhD thesis to use data that have been converted from low frequency (annually data) to higher frequency (quarterly data). I'm...

    Started by siddig‎, 01-14-2016 01:27 PM
    identification, var
    • Replies: 7
    • Views: 1,627
    01-16-2016, 09:59 AM Go to last post
  58. How to calculate the mean of two log-likelihood values.

    Hi All, I'm confused how to calculate the mean of two (natural) log-likelihood values. The software I'm using (MrBayes) does this for me...

    Started by StevenH‎, 01-15-2016 08:41 AM
    likelihood, logarithm, mean of logs
    • Replies: 3
    • Views: 1,223
    01-15-2016, 12:33 PM Go to last post
  59. Monte Carlo Simulation?

    Sorry I want this deleted

    Started by ber1023‎, 01-14-2016 09:44 AM
    excel, montecarlo, stats
    • Replies: 0
    • Views: 1,150
    01-14-2016, 09:44 AM Go to last post
  60. 1 X 2 Chi Square? With controlled expected values?

    Good Morning, Im wondering if you could possibly help me with a little problem. I have some data: 1. Number and date of disease outbreak...

    Started by SiobhanRoisin‎, 01-14-2016 05:43 AM
    chi square, expected values
    • Replies: 2
    • Views: 1,717
    01-14-2016, 09:34 AM Go to last post

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