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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: 136,219
    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: 38,879
    09-30-2005, 10:44 AM Go to last post
  1. ANOVA - Calculate the sum of squares within and between from the total sum of squares

    Hi there, I am wondering how to calculate the Sum of Squares within and the Sum of Squares between when I have been given the total sum of squares,...

    Started by gpmp1996‎, Yesterday 06:54 AM
    • Replies: 1
    • Views: 82
    Today, 03:27 AM Go to last post
  2. Misbehaving variable in AMOS

    Hi everyone! I'm currently doing random-intercept cross lagged panel modeling in AMOS. It's good fun...except....one of my variables is...

    Started by jereminho‎, Today 01:23 AM
    • Replies: 0
    • Views: 16
    Today, 01:23 AM Go to last post
  3. Lightbulb How many mothers with shoolkids (scholars, pupils). COFFEE inside

    Hello! INSANE REQUEST: There are 22.681M school age kids in Philippines, how many MOTHERS (or FATHERS) do they have? Knowing that the...

    Started by AntonF‎, Yesterday 07:22 PM
    • Replies: 5
    • Views: 70
    Yesterday, 08:05 PM Go to last post
  4. Calculating values of a reference group

    Hi everyone, Thanks for the great homework help! I am supposed to calculate the estimated BMI for those at with 122 SBP, 134 SBP and 147 SBP...

    Started by smashing‎, 12-03-2016 06:29 PM
    • Replies: 0
    • Views: 95
    12-03-2016, 06:29 PM Go to last post
  5. Question Absolute Loss Function

    I am quite honestly at an "absolute loss" with this one... I know the answer can't be 2 yet I keep getting it.. any help is much appreciated. ...

    Started by Shaun2010‎, 10-09-2013 02:05 PM
    baysian, decision theory, loss function
    • Replies: 6
    • Views: 2,168
    12-03-2016, 11:28 AM Go to last post
  6. Estimation of Loss Distribution Parameters.

    A statistician is trying to decide on the value of an unknown parameter ϴ, where ϴ is the maximum claim that can occur for a line of business whose...

    Started by MathMaster135711‎, 12-03-2016 07:30 AM
    loss distribution uniform
    • Replies: 0
    • Views: 87
    12-03-2016, 07:30 AM Go to last post
  7. Combinations average

    I have 6 averages, 365, 406, 420, 416, 434, 435. How many ways can you split the group to have two groups of 3 with similar averages? The closer the...

    Started by MelomaniacJEFF‎, 12-02-2016 09:37 PM
    combinations, statistics
    • Replies: 1
    • Views: 88
    12-03-2016, 02:22 AM Go to last post
  8. Stats newbie Jezbel needs help - Simple Chi Square question

    Hello, This is Jezbel! How are you? Can someone please help me interpret this table? I have read and researched, but am still confused. ...

    Started by jezbeliverson‎, 12-02-2016 07:12 PM
    • Replies: 4
    • Views: 100
    12-02-2016, 09:36 PM Go to last post
  9. Machine Learning Classification (R)

    I have a continuous variable that I want to dichotomize as a classifier for a binary dependent variable. I had split it last year using logic based...

    Started by hlsmith‎, 12-01-2016 09:50 AM
    • Replies: 6
    • Views: 150
    12-02-2016, 05:41 PM Go to last post
  10. creating a categorical variable with a continuous variable

    Hi, I have a year of birth variable that I'm regrouping into categories (for example 1970-1974 is coded as 1, 1975-1979 is coded as 2, etc). I...

    Started by Alex C‎, 12-02-2016 11:19 AM
    • Replies: 1
    • Views: 76
    12-02-2016, 12:26 PM Go to last post
  11. Cohort as level 1 regressor in hierarchical age-period-cohort models (HAPC models)

    Dear Talkstats, What a great site! :tup: I cannot believe I only just discovered the site. I look forward to many interesting debates with you...

    Started by Mortena‎, 12-02-2016 08:00 AM
    • Replies: 0
    • Views: 55
    12-02-2016, 08:00 AM Go to last post
  12. HW Problem

    NM will post earlier

    Started by needhelpplz‎, 12-01-2016 11:50 PM
    • Replies: 0
    • Views: 86
    12-01-2016, 11:50 PM Go to last post
  13. Regression coefficient for reference groups -- yay or nay?

    Hi all, When I'm working on a variable with 5 different categories and one is the reference group in a logistic regression, I only have 4...

    Started by smashing‎, 12-01-2016 07:50 PM
    • Replies: 5
    • Views: 113
    12-01-2016, 10:01 PM Go to last post
  14. glmer help

    Hi everyone, I'm trying to make the jump up to more advanced stats on a current research project, have talked to some really knowledgeable people in...

    Started by Samb‎, 11-30-2016 04:11 PM
    • Replies: 3
    • Views: 116
    12-01-2016, 04:58 PM Go to last post
  15. Exclamation Factorial Repeated measure MANOVA Tutorial

    Does anyone have a tutorial that can be useful for a Factorial Repeated measures MANOVA_ using SPSS? I have three fixed predictors, and two...

    Started by sylnyapi‎, 12-01-2016 03:16 PM
    • Replies: 0
    • Views: 66
    12-01-2016, 03:16 PM Go to last post
  16. Cross validation question

    Hi guys, I am a bit confused about what k-fold Cross Validtation does. Is it better to remove non significant variables and tune with k-fold cross...

    Started by datum‎, 11-16-2016 05:34 PM
    cross validation, model fit, regression
    • Replies: 8
    • Views: 340
    12-01-2016, 09:23 AM Go to last post
  17. Finding a Correlation Between Seasonal Affective Disorder and Self-Esteem

    I am trying to decide which statistical test to use for a psychological study I am doing for a class. My study is on Seasonal Affective Disorder...

    Started by gmgarry‎, 11-30-2016 08:39 PM
    • Replies: 1
    • Views: 104
    11-30-2016, 10:40 PM Go to last post
  18. Smile Before/After- t-test???

    Hello everyone, Kinda new to this forum. I need help in finishing off this project. So, my research question is whether an increase in the blood...

    Started by Masoomi96‎, 11-30-2016 06:14 PM
    homework, minitab, paired difference, t-test
    • Replies: 0
    • Views: 97
    11-30-2016, 06:14 PM Go to last post
  19. Interpreting odds ratio

    Hi everyone, I was wondering if someone may help/validate my interpretation off an odds ratio. The variables I have that are relevant to this...

    Started by smashing‎, 11-30-2016 04:31 PM
    • Replies: 2
    • Views: 77
    11-30-2016, 04:47 PM Go to last post
  20. Which statistical test to compare mortality risk scores?

    Hi, I am an ICU doctor and I am doing a study comparing the validity of three different mortality risk scores (lets call them test1, test2 and...

    Started by yiatros‎, 11-29-2016 04:20 PM
    • Replies: 2
    • Views: 124
    11-30-2016, 02:03 PM Go to last post
  21. decision under loss function, discrete Bayes

    Hi guys, This is my first post here. I am currently enrolled in the Coursera Bayesian Statistics course from Duke University. While I've enjoyed...

    Started by tralalilu‎, 11-30-2016 07:04 AM
    bayesian, decision, decision making, loss function
    • Replies: 0
    • Views: 79
    11-30-2016, 07:04 AM Go to last post
  22. Comparing several means pre and post intervention - MANOVA?

    Hi, I am looking to analyse some data I have collected for a piece of research. I wanted to evaluate the impact of a Mindfulness intervention upon...

    Started by helenoc24‎, 11-21-2016 03:54 AM
    comparing means, manova, pre and post, repeat measures
    • Replies: 1
    • Views: 160
    11-30-2016, 03:03 AM Go to last post
  23. Calculating 95% Confidence Intervals for Prevalence (%)

    Hi All, I am hoping to get some advice on how I can calculate the 95% Confidence Intervals for prevalence percentages. My sample size is 180, and...

    Started by bozatron‎, 11-23-2016 01:54 AM
    • Replies: 1
    • Views: 156
    11-30-2016, 02:53 AM Go to last post
  24. Research project: Method advice

    Hello everyone, I've been a lurker for quite a while (and I owe much of my stats knowledge to this forum) but this time, I have a question...

    Started by komutanlogar‎, 11-29-2016 07:56 PM
    • Replies: 0
    • Views: 96
    11-29-2016, 07:56 PM Go to last post
  25. Doing A Research Project and Confused on which Test I should use

    I'm doing a research project on Anolis Carolinensis and Anolis Sagrei to determine if A. Carolinensis is being displaced by A. Sagrei. It sounds...

    Started by ThomasDyal‎, 11-29-2016 03:36 PM
    • Replies: 1
    • Views: 84
    11-29-2016, 06:24 PM Go to last post
  26. Calculating the value of Adjusted R2 using SSR and Standard Error

    TABLE 12-9 You decide to predict gasoline prices in different cities and towns in the United States for your term project. Your dependent variable...

    Started by Chris1991‎, 11-29-2016 03:57 PM
    adjusted r-square, regression analysis, statistics
    • Replies: 0
    • Views: 84
    11-29-2016, 03:57 PM Go to last post
  27. Different test?

    I was curious if any of you have advice as to what test would be appropriate. I've used regression analysis to attempt to predict scores. But was...

    Started by trampledunderfoot‎, 11-29-2016 12:03 AM
    • Replies: 0
    • Views: 110
    11-29-2016, 12:03 AM Go to last post
  28. How to calculate Huber Estimator

    Hi, I would like to understand how to compute the Huber estimator. As I read, the objective function of Huber estimator is minimizing $\rho (x_i...

    Started by jyanto‎, 11-28-2016 12:45 PM
    estimator, statistic
    • Replies: 1
    • Views: 135
    11-28-2016, 04:46 PM Go to last post
  29. What kind of test should I use?

    I have 50 test items for 1000 students, each student answered 30 of them. I would like to find out whether the rate of correctness of items is...

    Started by pancy‎, 11-25-2016 12:11 AM
    • Replies: 3
    • Views: 256
    11-28-2016, 03:13 AM Go to last post
  30. Compute variables? Number of births by year

    Hello - I am working through a university statistics course without prior knowledge of statistics, so I apologize if the description of my question...

    Started by shirinjune‎, 11-27-2016 06:14 AM
    compute variables
    • Replies: 0
    • Views: 120
    11-27-2016, 06:14 AM Go to last post
  31. regression/correlation for classified data

    Hi, I have classified data regarding income. Besides, I have a 7-point Likert scale where people express their favor toward mobility management...

    Started by blazey‎, 11-26-2016 09:57 AM
    • Replies: 0
    • Views: 150
    11-26-2016, 09:57 AM Go to last post
  32. how can I calculate the percentage

    Hello, I have been trying to search how to calculate the best percentage of wastage that its acceptable, and still get high Sale values by using...

    Started by brexlin‎, 11-26-2016 01:59 AM
    • Replies: 0
    • Views: 143
    11-26-2016, 01:59 AM Go to last post
  33. Random survival forests

    Would like to hear if any one has used this method for survival analysis. How does it compare with COX models while building a model with several...

    Started by LathaKadalayil‎, 11-16-2016 11:37 AM
    • Replies: 4
    • Views: 255
    11-25-2016, 08:29 PM Go to last post
  34. Regression coefficient for interaction

    Hi! I have a homework question that on the face looks rather simple to me, but I want to check with people who may have greater statistics...

    Started by smashing‎, 11-22-2016 06:08 PM
    • Replies: 2
    • Views: 160
    11-25-2016, 04:58 PM Go to last post
  35. Post Voter Engagement Methodology

    I need some help with measuring voter engagement among native and naturalized citizens depending on their respective race. dependent variable/s:...

    Started by Boxer007‎, 11-24-2016 01:54 PM
    • Replies: 1
    • Views: 143
    11-25-2016, 06:35 AM Go to last post
  36. Wink Comparing the intercept and the estimate coefficient in time-series regression

    Hi there. I'm still a bit of a novice, and I'm wondering if anyone could advice me if this is empirically "responsible"? So essentially I've...

    Started by Michael54321‎, 11-24-2016 11:46 AM
    • Replies: 0
    • Views: 105
    11-24-2016, 11:46 AM Go to last post
  37. Sample Size Calculation/power calcuation for retrospective study

    Hi all, I recently completed a study looking at hospital records over a 5 year period (fixed population of participants based on study period)....

    Started by Damo123‎, 11-24-2016 10:04 AM
    power calculation, retrospective study, sample size
    • Replies: 0
    • Views: 100
    11-24-2016, 10:04 AM Go to last post
  38. Assignment

    Can someone help on this? A statistics professor gave three quizzes leading up to the first test in his class. The quiz grades and test grade for...

    Started by J_Stats‎, 11-24-2016 06:41 AM
    • Replies: 0
    • Views: 173
    11-24-2016, 06:41 AM Go to last post
  39. Meta-analysis - mean (target mean correction)

    I had a statistical question which I'll mention here if you have time to have a look at it then I'd be very grateful for your thoughts. Im...

    Started by Jack Florence‎, 11-23-2016 06:24 PM
    • Replies: 1
    • Views: 148
    11-23-2016, 10:42 PM Go to last post
  40. t-test for large sample size - bike hire data

    Hello everyone, I'm taking a graduate-level statistics course at the University of Glasgow which includes a methods assignment. The assignment...

    Started by bikingman‎, 11-22-2016 03:06 PM
    t-test, t-test two-sample
    • Replies: 2
    • Views: 176
    11-22-2016, 06:13 PM Go to last post
  41. Technical efficiency

    Hello to everyone , i'm new in this forum , i would like to know if there is a relationship between the coefficient and the std in the calculation of...

    Started by danilo93‎, 11-22-2016 12:27 PM
    • Replies: 2
    • Views: 128
    11-22-2016, 06:02 PM Go to last post
  42. Identifying Effect size in Power Analysis

    I have a set of data for a water quality parameter on which is used to compute Rank Spearman Trend. I am interested to know whether the number of...

    Started by rajabadsha‎, 11-21-2016 08:05 AM
    • Replies: 5
    • Views: 185
    11-22-2016, 10:06 AM Go to last post
  43. lottery question

    Connecticut has a lottery game called Cash5. There are 35 numbers to choose from. You have to select 5 numbers. 5 numbers are then drawn...

    Started by tdx‎, 11-22-2016 07:42 AM
    • Replies: 1
    • Views: 110
    11-22-2016, 08:16 AM Go to last post
  44. SEM / path model = visualization of a hierarchical regression?

    Hi everybody, nice to have found such a useful forum! And I hope someone can help me with my statistical problem! I have the following...

    Started by Klaus die Maus‎, 11-10-2016 11:27 PM
    • Replies: 3
    • Views: 301
    11-22-2016, 06:55 AM Go to last post
  45. Bootstrap procedure to test difference between correlation coefficients

    Hi everyone, I have two correlation coefficients (r1 and r2), obtained within the same sample (20 subjects). My aim is to test it they are...

    Started by smndpln‎, 11-16-2016 05:03 AM
    bootstrap, correlation, neuroscience, resampling, t-test two-sample
    • Replies: 5
    • Views: 311
    11-22-2016, 05:07 AM Go to last post
  46. Significant Difference between Students' Evaluation and Teachers' Evaluation

    Good day! I am working with a research paper regarding the significant difference between the students' evaluation and teachers' evaluation in...

    Started by nash0612‎, 11-22-2016 01:52 AM
    • Replies: 1
    • Views: 116
    11-22-2016, 03:25 AM Go to last post
  47. Trying to find the root cause of a communication issue.

    Good Morning.. I have four host computers which hold a variety of virtual servers. We are seeing intermittent communication slowness when performing...

    Started by dherde‎, 11-21-2016 01:09 PM
    • Replies: 0
    • Views: 141
    11-21-2016, 01:09 PM Go to last post
  48. Which statistical test to use?

    In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

    Started by sylnyapi‎, 11-21-2016 08:41 AM
    • Replies: 2
    • Views: 170
    11-21-2016, 11:11 AM Go to last post
  49. p-value and hypothesis testing

    Hi, I've one question concerning the p-value. I've run a regression in STATA with one independent variable (x1) with a small positive coefficient and...

    Started by frankys‎, 11-20-2016 05:01 PM
    • Replies: 3
    • Views: 194
    11-21-2016, 09:05 AM Go to last post
  50. Recalculate ratings

    Hi. I wish to compare 3 products that have the follwing scores 1) 86/100 I.e 0.86 from 1200 ratings 2) 78/100 from 100 ratings 3) 81/100 from...

    Started by shaju304‎, 11-20-2016 04:06 AM
    • Replies: 0
    • Views: 157
    11-20-2016, 04:06 AM Go to last post
  51. Anova Repeated Measures to compare three different variables?

    In a psychology research (not published yet) an Anova Repeated Measures test was used to compare three different variables measured (at the same...

    Started by flegmatiq‎, 11-20-2016 02:04 AM
    anova repeated measures
    • Replies: 0
    • Views: 168
    11-20-2016, 02:04 AM Go to last post
  52. Sensitivity/Specificity of a Test Procedure Question

    Hi everyone, I'm a bit unsure on how to do this problem. It's mainly about sensivity, specificity, and probability. I'm especially confused about...

    Started by Mewtwo‎, 11-20-2016 12:55 AM
    • Replies: 0
    • Views: 135
    11-20-2016, 12:55 AM Go to last post
  53. Conditional expectation

    I have been given a expected value of conditional expression. I have to show that the expression is equal to the term on the right side. How do I get...

    Started by trulshalvor‎, 11-19-2016 12:01 PM
    • Replies: 0
    • Views: 151
    11-19-2016, 12:01 PM Go to last post
  54. Parametric vs nonparametric tests

    I'm pretty confused about the conditions in which I should use a parametric or a nonparametric test to compare the means of 2 (or more) populations...

    Started by david030177‎, 11-17-2016 05:10 PM
    nonparametric tests, parametric test
    • Replies: 7
    • Views: 416
    11-19-2016, 02:03 AM Go to last post
  55. Population specific odds ratio and subject specific odds ratio

    Hey guys, For a school assignment I have to compute the population specific odds ratio and the subject specific odds ratio from the table below. ...

    Started by Iris Ilja‎, 11-15-2016 07:33 AM
    categorial analysis, odds ratio
    • Replies: 5
    • Views: 303
    11-17-2016, 12:21 PM Go to last post
  56. Question Sample Data Provided! Ranking Content Performance in Email Sends

    Hello! I have searched the forum, but my question is so specific and I know so little I cannot identify threads that would answer my question. ...

    Started by SamParsons‎, 11-14-2016 10:02 PM
    email, ranking, statistics, technology
    • Replies: 1
    • Views: 197
    11-16-2016, 11:44 PM Go to last post
  57. Which SD to use for calculating minimal detectable change values?

    I am hoping for some assistance with understanding the correct SD to use for the calculation of minimal detectable change scores. I have the...

    Started by LeeRC‎, 11-15-2016 07:53 PM
    mdc, minimal detectable change
    • Replies: 0
    • Views: 160
    11-15-2016, 07:53 PM Go to last post
  58. Categorical Data Analysis: log linear analysis

    Hey guys, I'm very new to statistics so I have a question: Consider gender (G), neuroticism (N), openness (O), major depression (MDD), and...

    Started by Iris Ilja‎, 11-15-2016 07:22 AM
    categorial analysis, log linear, simple
    • Replies: 0
    • Views: 158
    11-15-2016, 07:22 AM Go to last post
  59. Dice problem help

    I'm trying to get this problem set up correctly but I seem to have an issue as my calculated standard deviation seems to be off. Anyone have any...

    Started by Cerran‎, 11-13-2016 10:40 PM
    • Replies: 7
    • Views: 289
    11-14-2016, 02:51 PM Go to last post
  60. [STATA - gsem] Multilevel Structural Equation Model - Meta Analysis

    Hello, I am quite familiar with mixed effects (multilevel models) in meta analyses. Now, I want to do a mixed effects (multilevel) meta...

    Started by Bavarian‎, 11-12-2016 07:26 AM
    meta-analysis, sem, stata
    • Replies: 1
    • Views: 152
    11-13-2016, 05:07 PM Go to last post

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