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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: 197,080
    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: 66,915
    09-30-2005, 09:44 AM Go to last post
  1. Exclamation Cox Proportional hazard model result interpretation

    Could anyone please help me to interpret results from Cox Proportional hazard model result interpretation.:wave: I am using SAS ENTERPRISE Guide and...

    Started by AnnaPanna‎, 03-24-2014 02:49 PM
    • Replies: 4
    • Views: 2,372
    03-25-2014, 06:21 AM Go to last post
  2. Calculating Combinations: C(n,k)

    Hi, I need help with a combinations calculation question, please. I'm working on a study in which I need to compare a common outcome of 7...

    Started by Veronica‎, 03-24-2014 09:28 PM
    combinations equation
    • Replies: 2
    • Views: 1,253
    03-25-2014, 06:08 AM Go to last post
  3. Appropriate analysis for Likert scale items.

    Hey, everyone! Quick question regarding analysis of survey (which aims to asses women's views and attitudes towards offenders with mental health...

    Started by Elevatorprices‎, 03-23-2014 08:20 PM
    • Replies: 7
    • Views: 2,168
    03-24-2014, 02:47 PM Go to last post
  4. 4th-variance?

    Hello any and all, I am no statistician so does the term "4th-variance" mean anything to someone? I am attempting to replicate the technique found...

    Started by barfknechtj‎, 03-24-2014 01:49 PM
    expectation, moments, variance
    • Replies: 0
    • Views: 1,647
    03-24-2014, 01:49 PM Go to last post
  5. X-bar and R chart question

    Hi, If anyone could help me understand the logic of the following question, that would be much appreciated! Q: A process is in control at...

    Started by eddiematt‎, 03-21-2014 04:41 PM
    • Replies: 4
    • Views: 4,261
    03-24-2014, 11:48 AM Go to last post
  6. True positive having a negative value

    Is it fine if someone gets a "negative" value for the True Positive (TP)? Thanks.

    Started by Abder-Rahman Ali‎, 03-24-2014 05:55 AM
    • Replies: 2
    • Views: 1,349
    03-24-2014, 10:45 AM Go to last post
  7. Interpreting Confidence Interval Data

    Thanks, got my answer.

    Started by littletreecreature‎, 03-24-2014 05:22 AM
    • Replies: 1
    • Views: 1,233
    03-24-2014, 05:36 AM Go to last post
  8. Nested Anova - Use sums instead of mean?

    Dear all, At the moment, I'm trying to do a 'Nested Anova'. I have several years (2004 to 2012) and four seasons. So a nested anova is called for...

    Started by Daikoro‎, 03-23-2014 10:54 PM
    nested anova
    • Replies: 4
    • Views: 1,090
    03-24-2014, 01:41 AM Go to last post
  9. Bootstrap and boundary region

    Hi, I have got 3 questions. Many thanks for your precious help. 1) One way of carrying out the bootstrap is to average equally over all...

    Started by figone‎, 03-07-2014 06:35 AM
    • Replies: 1
    • Views: 6,704
    03-24-2014, 01:29 AM Go to last post
  10. Data normality / Process Capability

    Hi All, I would really appreciate if someone could help me with the following query... I have 30 batches of continuous data (weight data) and...

    Started by Tuts‎, 03-19-2014 04:53 PM
    • Replies: 11
    • Views: 3,016
    03-24-2014, 01:09 AM Go to last post
  11. Correlation Matrix in SPSS Using Coefficents

    I am taking an online course in Stats, so I pretty much have to learn on my own and figure out what the assignment questions are asking. I have no...

    Started by louisjxn‎, 03-23-2014 01:42 PM
    • Replies: 3
    • Views: 1,432
    03-23-2014, 07:56 PM Go to last post
  12. Normalizing Data

    Hi all, I have a very small dataset (1 independent variable with 7 levels, each with only 3 data values). I assume I would need to test if the...

    Started by SollyDan‎, 03-23-2014 10:07 AM
    • Replies: 5
    • Views: 1,810
    03-23-2014, 04:18 PM Go to last post
  13. Analysis advice.

    I am working on project that is comparing two types of corn and their crop yield. For each corn variety they were planted in various soil types and...

    Started by amcclur‎, 03-23-2014 10:49 AM
    • Replies: 1
    • Views: 1,208
    03-23-2014, 04:08 PM Go to last post
  14. Confused about a question on random samples, population and variances

    Here is the question along with the solution: Here is my attempt before looking at the solution: Looking back at my attempt, I realize it...

    Started by theBEAST‎, 03-23-2014 03:34 AM
    • Replies: 1
    • Views: 973
    03-23-2014, 03:31 PM Go to last post
  15. Which analyze to perform on frequencies

    Hello all, I have made a survey with some likert-scale from 1 to 5 and got some answers. I have one question that is asking something like, Is...

    Started by moihenry‎, 03-22-2014 12:47 PM
    • Replies: 3
    • Views: 1,231
    03-23-2014, 12:37 PM Go to last post
  16. Puzzled: Which method to use with variances as raw data?

    Hi All Many Thanks! This is out of my depth. Appreciate if any of the members would give some ideas on which method? I was given the raw data...

    Started by milk‎, 03-23-2014 11:20 AM
    • Replies: 0
    • Views: 1,105
    03-23-2014, 11:20 AM Go to last post
  17. Very significant findings - but how do I show that? What's a binomial choice?

    Hi all, I'm writing a paper based on one which uses 'binomial choice'. I can't seem to find this in textbooks, what's the most common name for it?...

    Started by QueenOfStats‎, 03-21-2014 07:39 AM
    • Replies: 10
    • Views: 1,277
    03-23-2014, 08:42 AM Go to last post
  18. Question Need method for analysing two sets of time course data

    Hello, I have two sets of time course data, they are for an eye-tracking study. The data is 20 100ms chunks, one category being percent fixations for...

    Started by kylem1994‎, 03-23-2014 12:32 AM
    eye-tracking, regresion, regression analysis, spss, time dependence
    • Replies: 0
    • Views: 849
    03-23-2014, 12:32 AM Go to last post
  19. very basic standard dev. & probability question

    ok. first dont laugh at me for being a simpleton. im more of a man of letters than numbers. i took a total of one math class my entire college...

    Started by BlametheMayo‎, 03-22-2014 10:28 PM
    • Replies: 0
    • Views: 899
    03-22-2014, 10:28 PM Go to last post
  20. What type of test should I run?

    Hello, I need to do a statistical analysis on some data for a engineering project of mine. Ok, so what I need to do is prove that my robot can sense...

    Started by KentuckyBlue‎, 03-22-2014 04:37 PM
    • Replies: 0
    • Views: 1,202
    03-22-2014, 04:37 PM Go to last post
  21. I need help - Which Method of Hypothesis Testing

    I'm working on a stats paper, and I am completely lost, stats is pretty out of my grasp and I am having a hard time... I am writing a research...

    Started by JordanW‎, 03-22-2014 02:17 PM
    • Replies: 0
    • Views: 807
    03-22-2014, 02:17 PM Go to last post
  22. Correlation vs causation

    Hi, Recently I posted this image of a primary level science exercise on Facebook: The data set given was 1. Increasing population of owls 2....

    Started by kiankheong‎, 03-22-2014 12:34 PM
    • Replies: 0
    • Views: 994
    03-22-2014, 12:34 PM Go to last post
  23. Sum of independent Poisson random variables problem

    There are 3 parts to the problem. The statement is the discrete rvs X1,.., Xn are independent & each Xi has the Poisson distribution. Part (i) is...

    Started by Colin McN‎, 03-22-2014 11:21 AM
    • Replies: 1
    • Views: 1,294
    03-22-2014, 11:50 AM Go to last post
  24. quick question

    Hi I have a quick question that I can't seem to get the answer to The question is According to the Ryerson Accounting Firm, the chances of your...

    Started by zenblime‎, 03-22-2014 09:00 AM
    • Replies: 0
    • Views: 1,033
    03-22-2014, 09:00 AM Go to last post
  25. Non-parametric version of 2x4 ANOVA

    I'm trying to figure out this statistical analysis in SPSS; I have 2 IVs, one with 2 levels and one with 4 levels, and 1 DV which is normally...

    Started by noon‎, 03-22-2014 08:17 AM
    • Replies: 0
    • Views: 1,160
    03-22-2014, 08:17 AM Go to last post
  26. One side paired t-test for finding which mean (out of two) is significantly higher?

    Hi, I am trying to learn stat and it seems i have a verryyy long way to go. :shakehead Here is my problem - I have to compare two series of...

    Started by mark_74‎, 03-21-2014 12:30 AM
    • Replies: 2
    • Views: 935
    03-22-2014, 02:37 AM Go to last post
  27. t-test for independent samples question

    Hello all, I'm looking for a little help with a research problem I'm working on. Without getting into the nitty-gritty of the details (which I can...

    Started by ScopeDope‎, 03-17-2014 10:40 AM
    • Replies: 8
    • Views: 1,754
    03-22-2014, 01:29 AM Go to last post
  28. Quick question about which tests I should perform!

    Hi Everyone, I am fairly new to the world of statistics as I work mainly in the clinical field. I have a query regarding which statistical test I...

    Started by tajn‎, 03-21-2014 10:03 PM
    • Replies: 0
    • Views: 1,311
    03-21-2014, 10:03 PM Go to last post
  29. Controlling for Type 1 Errors: Post-hoc testing on more than 1 ANOVA

    I have conducted several repeated-measures ANOVA's with post-hoc testing via Tukey's HSD whenever the omnibus F-test was significant. I'm having some...

    Started by feather‎, 03-21-2014 12:42 PM
    anova, bonferroni correction, multiple comparisions, tukey hsd, type 1 error
    • Replies: 0
    • Views: 2,335
    03-21-2014, 12:42 PM Go to last post
  30. Confidence intervals vs. p -value

    Hi, we just had a very interesting discussion about the role of confidence intervals and p values in determining significance and I realised there...

    Started by rogojel‎, 03-21-2014 04:02 AM
    confidence interval, decision, p-value, practical significance
    • Replies: 0
    • Views: 2,985
    03-21-2014, 04:02 AM Go to last post
  31. Talking confidence interval interpretation -please help

    how do i interpret a 95% confidence interval which is presented in percentages with no standard deviations. (this is for a medical essay) two...

    Started by soph‎, 03-20-2014 08:58 AM
    • Replies: 14
    • Views: 2,013
    03-21-2014, 03:18 AM Go to last post
  32. Linearity, Homogeneity, randomness, normally distributed data interpretation helPASAP

    Hi, thankyou in advance for your help :) Im conducting a multiple regression to try and predict the maximum age an individual will seek in a...

    Started by clh2‎, 03-20-2014 12:00 PM
    • Replies: 6
    • Views: 1,582
    03-20-2014, 02:19 PM Go to last post
  33. Chebyshev Problem

    Hi fellow statisticians, I am having difficulties with solving the following question: Assume a beverage filling company is supposed to fill...

    Started by youkie‎, 03-19-2014 04:49 PM
    • Replies: 1
    • Views: 1,337
    03-20-2014, 11:17 AM Go to last post
  34. comparing estimators

    I'm comparing the following 4 estimators of location of the Cauchy distribution: Let x_{1},..x_{n} be observations and $l$ be the log likelihood...

    Started by Henry10‎, 03-20-2014 09:37 AM
    • Replies: 1
    • Views: 1,566
    03-20-2014, 09:48 AM Go to last post
  35. Bayesian Stats: Full Conditional Probability

    I am trying to derive an FCD for a particular likelihood, I have attached the file of what I derived and just wanted to know if I was headed in the...

    Started by cthurman‎, 03-19-2014 07:53 PM
    • Replies: 2
    • Views: 1,276
    03-20-2014, 01:32 AM Go to last post
  36. Need Help Finding Data

    Lame of me, I know. However, I am having trouble finding exactly what I need. If anybody with a bit better knowledge than me can help me find this...

    Started by September‎, 03-19-2014 11:17 PM
    • Replies: 0
    • Views: 1,072
    03-19-2014, 11:17 PM Go to last post
  37. how to calculate the cost

    I have a question: one patient take two kinds of drug. the first drug cost $35 and he take 7 days. the second drug cost $75 and he take 3 days. how...

    Started by jj0911‎, 03-19-2014 09:23 PM
    • Replies: 0
    • Views: 1,282
    03-19-2014, 09:23 PM Go to last post
  38. NEed help interpretting anova statistics

    I apologize for my ignorance, but I have no statistics background and so am having a lot of trouble interpretting my data. We ran an experiment to...

    Started by tdod‎, 03-16-2014 05:18 PM
    • Replies: 1
    • Views: 1,171
    03-19-2014, 04:44 PM Go to last post
  39. Post Please help with this excercise

    Hi guysss i am new here , and in statistical classs I need help to much for these excercise Use a computer and generate 50 random samples, each...

    Started by incasdal‎, 03-19-2014 04:10 PM
    • Replies: 0
    • Views: 1,210
    03-19-2014, 04:10 PM Go to last post
  40. Please help - question re gym membership and differences of independence

    Hiya, I have been trying for ages to get my head around this and i am still so unclear. I am looking at a set of 20 local gyms and seeing out...

    Started by LucyWillow‎, 03-18-2014 10:59 AM
    • Replies: 8
    • Views: 1,586
    03-19-2014, 03:51 PM Go to last post
  41. Mixed Model for Repeated Measures? How to analyze data help SPSS

    Hi, So I need help determining how to analyze my data with SPSS. I'll briefly describe the study design. It is repeated measures at 4 time...

    Started by LauraGH‎, 03-09-2014 10:36 PM
    • Replies: 3
    • Views: 2,220
    03-19-2014, 01:32 PM Go to last post
  42. Intro to Statistics Assignment help

    Hey guys, I have a few questions on my intro to statistics assignment that I need some help on. Question #1 2a. This seems like a weird...

    Started by eastsidePAT‎, 03-19-2014 11:16 AM
    • Replies: 1
    • Views: 1,592
    03-19-2014, 11:17 AM Go to last post
  43. Help please! Tests for normality of data

    Hi all, I've produced two data sets as part of a research project, but cannot tell if one of them is normally distributed, since the Shapiro-Wilk...

    Started by skepta‎, 03-19-2014 09:39 AM
    • Replies: 2
    • Views: 1,526
    03-19-2014, 10:14 AM Go to last post
  44. paired t-test or linear regression?

    Hello, I am applying for an IRB to evaluate the effect of lidocaine (local anesthetic) dilution on pain and duration of intradermal anesthesia. ...

    Started by randallgunther‎, 03-17-2014 11:14 AM
    • Replies: 12
    • Views: 3,012
    03-19-2014, 06:45 AM Go to last post
  45. Confidence interval when data is in range

    I am trying to calculate the confidence interval when data is given in range. Example: Rather than telling their exact age in years, 9 sample...

    Started by vinay453‎, 03-18-2014 09:20 PM
    • Replies: 0
    • Views: 1,232
    03-18-2014, 09:20 PM Go to last post
  46. Smile Creating new variable from coefficients

    Hi I'm new to stata so just bear with me. I'm doing a VAR using inflation as my dependent variable and exchange rate as an independent...

    Started by dschneider‎, 03-17-2014 05:22 PM
    coefficients, error, var
    • Replies: 2
    • Views: 1,495
    03-18-2014, 07:47 PM Go to last post
  47. Angry What statistical analyses to use? How age influences bone density

    So I have a variable, lets say Bone density in older adults. I have200+ participants ranging from 50-80 years and with its respective bone...

    Started by rperea‎, 03-17-2014 05:20 PM
    • Replies: 7
    • Views: 9,954
    03-18-2014, 03:04 AM Go to last post
  48. [ AP STATISTICS ] Quiz 6.2B - Standard Deviation/ Mean Problem.

    Solved. Mods may delete this now :)

    Started by L1LK1LLERZ‎, 03-17-2014 07:09 PM
    • Replies: 2
    • Views: 7,283
    03-17-2014, 08:59 PM Go to last post
  49. Interpreting similarity coefficients

    I am interested in finding out a good measure of similarity to determine if two sets are significantly similar to each other. I know there are many...

    Started by edaly‎, 03-17-2014 05:53 PM
    coefficient, critical values, significance test, similarity
    • Replies: 1
    • Views: 2,760
    03-17-2014, 08:15 PM Go to last post
  50. Question How to test dependent means with unequal sample size? Weighted Paired T-test?

    I am comparing the percent of a population that are juvenile between 'Autumn' and 'Spring' at many sites. The Sample size (n) is variable among the...

    Started by jkjkjij22‎, 03-17-2014 01:44 PM
    dependent, logistic regression, paired t-test, sample size, weighted means
    • Replies: 0
    • Views: 1,661
    03-17-2014, 01:44 PM Go to last post
  51. One-sample t-test, is this reasonable?

    Hi all, I am asked to construct a one-sample hypothesis testing in my assignment. I have collected data on GDP for 40 African countries, then I...

    Started by sarahg2014‎, 03-17-2014 04:50 AM
    • Replies: 9
    • Views: 1,488
    03-17-2014, 09:35 AM Go to last post
  52. Class Distribution, Boosted Models (gbm) Probability Scores

    All, Problem: I need help to better understand the probability scores that come from the result of a decision tree model. Specifically, I'm...

    Started by collin‎, 03-04-2014 04:21 PM
    • Replies: 6
    • Views: 3,068
    03-16-2014, 05:58 PM Go to last post
  53. Exclamation [URGENT] Prove Cox Snell residuals ~= exp(1)

    Hello all, While studying a past mid-term for a survival analysis course, I've come across a questions that troubled me so. The questions...

    Started by shary‎, 03-16-2014 04:34 PM
    • Replies: 0
    • Views: 1,256
    03-16-2014, 04:34 PM Go to last post
  54. Measuring relationship (correlation?) between continuous and categorical variables

    Really struggling with this so really appreciate help. I want to measure the difference between language scores (scores between 1 and 300) and 6...

    Started by 101lou‎, 03-16-2014 10:06 AM
    • Replies: 4
    • Views: 2,402
    03-16-2014, 04:22 PM Go to last post
  55. Justify the use of parametric tests on non normally distributed data

    Hello there. I have 5 Likert scale questionnaires that have been answered by the same people who have been randomly selected (N=24) and i have the...

    Started by skoui‎, 03-16-2014 08:37 AM
    likert, non parametric, normal distribution, normality, normality test, parametric test, survey
    • Replies: 4
    • Views: 7,860
    03-16-2014, 03:48 PM Go to last post
  56. GLM question

    Hi guys, I have done my GLM model fitting on R and I was wondering if someone could help me with the following question : What is the...

    Started by rune_32‎, 03-14-2014 07:17 PM
    • Replies: 4
    • Views: 1,622
    03-16-2014, 11:57 AM Go to last post
  57. Analysing Sales Data and Finding Patterns / Information

    Hi all, I stumbled across this page while trawling the net for ideas on how to work out my assignment. I was wondering whether anyone could...

    Started by nsam0001‎, 03-16-2014 11:25 AM
    analysis help
    • Replies: 0
    • Views: 869
    03-16-2014, 11:25 AM Go to last post
  58. Analysis headache: Hi, first timer and a little confused

    Hi there I hope you can help. I have done so much reading I feel I have tied myself in knots. I'm looking to find out the statistical test I need to...

    Started by JM80‎, 03-16-2014 05:46 AM
    • Replies: 0
    • Views: 1,215
    03-16-2014, 05:46 AM Go to last post
  59. Medical Statistics - Which test to use?

    I am trying to compare two variables and am struggling with an appropriate way to analyse the data. It is for a teaching project I am running and we...

    Started by Doc.Ed‎, 03-15-2014 12:40 PM
    • Replies: 5
    • Views: 2,463
    03-16-2014, 05:19 AM Go to last post
  60. Repeated measures 2-way ANOVA: Significant interaction but non-significant post hoc

    Hi everyone, I was wondering if statisticians can explain why ANOVA can yield a significant interaction but no significant differences in the post...

    Started by Excelsius‎, 03-16-2014 02:42 AM
    • Replies: 0
    • Views: 2,975
    03-16-2014, 02:42 AM Go to last post

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