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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: 197,097
    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: 66,925
    09-30-2005, 09:44 AM Go to last post
  1. sequencing in m-balls and n-bins

    Hi, I'm doing my graduate study in computer science and I faced the following question in my thesis. suppose there are n bins and m balls. we...

    Started by alirezaMon‎, 01-09-2015 02:52 AM
    • Replies: 4
    • Views: 2,913
    01-14-2015, 03:19 PM Go to last post
  2. Meaning of P-value when generating Pearson's R correlation coefficient ???

    I know how to generate Pearson's r correlation values in Excel and in R. I understand the meaning of the value as it ranges from -1<r<1 I also...

    Started by CrunchAndSee‎, 01-02-2015 08:12 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 9,332
    01-14-2015, 12:01 PM Go to last post
  3. Average based on Factor Analysis loadins

    I am interested in creating a new variable that is made up of the factors suggested from a Factor Analysis. However, the factor is made up of both...

    Started by lil-Peeks‎, 01-14-2015 07:22 AM
    • Replies: 1
    • Views: 2,317
    01-14-2015, 11:30 AM Go to last post
  4. Contingency Table Disaster

    Please delete thread.

    Started by AmateurStat‎, 01-13-2015 12:33 PM
    • Replies: 3
    • Views: 1,977
    01-14-2015, 11:22 AM Go to last post
  5. Question Best test to correlate 3 groups with multiple variables

    Hello, I have three groups of patients (different diseases) and for each of these patients I have some (up to 4) clinical/psychological datas (some...

    Started by HoBiz‎, 01-07-2015 12:06 PM
    • Replies: 3
    • Views: 2,373
    01-13-2015, 12:59 PM Go to last post
  6. Question Average of grading in relation to total sample size

    Hello all, Lets say I'm grading translation quality of 2 different translators, and want to see their average performances. Below is the current...

    Started by e.sezen‎, 01-13-2015 09:20 AM
    • Replies: 2
    • Views: 1,409
    01-13-2015, 09:37 AM Go to last post
  7. Test effect of a variable on paired data

    Dear forum readers, I would like to test an effect of a variable on numerical data (same as I would do with t-test or Mann-Whitney U test) but with...

    Started by Markica85‎, 01-10-2015 08:10 PM
    • Replies: 6
    • Views: 2,100
    01-11-2015, 04:55 PM Go to last post
  8. Research project data analysis

    Hello, I am a final year college Speech and Language student working on the research proposal for my final year project. I won't go into details...

    Started by beccaomal‎, 01-11-2015 02:57 PM
    • Replies: 1
    • Views: 1,056
    01-11-2015, 04:07 PM Go to last post
  9. Should I split my sample?

    For my master thesis I have conducted a survey with Likert-scales. But now I'm sure which test to use to verify or falsify my hypotheses. For...

    Started by Wyatt‎, 01-10-2015 08:23 AM
    likert
    • Replies: 1
    • Views: 999
    01-11-2015, 02:21 AM Go to last post
  10. Application of Multivariate Analysis

    The following situation is proven valuable where multivariate analysis can be applied. This example is taken from the book `Applied Multivariate...

    Started by Cynderella‎, 01-09-2015 08:10 AM
    multi-variable, multiple regression, multivariate analysis, multivariate data
    • Replies: 0
    • Views: 2,340
    01-09-2015, 08:10 AM Go to last post
  11. Stata Help - Regression Interactions.

    Hi everyone, I am currently doing some work on Stata. I have to interact two variables, and I am unsure of a few things - I have made several...

    Started by Smile_Guy‎, 01-08-2015 05:23 AM
    • Replies: 2
    • Views: 1,397
    01-08-2015, 10:34 PM Go to last post
  12. Covariance of two random variables

    I wanted to ask can someone explain to me how to prove this implication: If Y is a random variable that has finite second moments and distribution...

    Started by p.lucia.p‎, 01-08-2015 07:00 AM
    • Replies: 1
    • Views: 1,242
    01-08-2015, 09:13 AM Go to last post
  13. Master Thesis research Proposal questions

    I have no idea how this works so I'll just post my questions ^^. What is meant by "validation study"? The way I understand this is to first check...

    Started by Maximilian Kerski‎, 01-07-2015 10:59 PM
    research design
    • Replies: 0
    • Views: 1,284
    01-07-2015, 10:59 PM Go to last post
  14. Standard Error of the Measurement vs Method Error

    Test-retest reliability studies often use measures of response stability (SEM, ME, CV, etc) to quantify the reliability of testing. SEM =...

    Started by mdshaver‎, 01-03-2015 12:11 PM
    • Replies: 1
    • Views: 868
    01-07-2015, 04:04 PM Go to last post
  15. Statistics question help!!

    Hi All, I am new to this forum and seeking some help from you all. I am trying to solve this question to prepare for exam. I would need your help. ...

    Started by anna1999‎, 01-07-2015 03:35 PM
    • Replies: 0
    • Views: 1,479
    01-07-2015, 03:35 PM Go to last post
  16. How to check whethere there is a difference between 5 samples means

    I have five samples with their means (60, 58, 61.5, 48 and 42) and standard deviations (1, 3, 1.5, 4 and 2) for 3 trials. How to check whether there...

    Started by raviss‎, 01-07-2015 07:39 AM
    hypothesis testing, paired difference test, t-test, z-test
    • Replies: 1
    • Views: 929
    01-07-2015, 08:38 AM Go to last post
  17. Calculate optimal sample size (for surveys YES/NO)

    Hello, I'd like to calculate the optimal sample size for a survey, where the answers are just YES/NO. I found some tool on the internet, which do...

    Started by horror‎, 01-06-2015 01:58 PM
    • Replies: 0
    • Views: 1,727
    01-06-2015, 01:58 PM Go to last post
  18. Turning a continuous and an ordinal variable into one measure?

    Hi, In my research I've measured a certain construct in two ways. I'd like to combine both measures so I can have one variable I can use in...

    Started by Foon‎, 01-06-2015 01:24 PM
    • Replies: 1
    • Views: 1,191
    01-06-2015, 01:51 PM Go to last post
  19. Absence of interaction, but different patterns of simple main effects

    Hi, I'm using linear mixed models in SPSS to analyze the Reaction Time (RT) data for my first psycholinguistic study. I have two fixed variables...

    Started by mandyml‎, 01-06-2015 12:07 PM
    • Replies: 0
    • Views: 976
    01-06-2015, 12:07 PM Go to last post
  20. calculating Z for Box-Cox

    Hello, I'm a bit rusty with my maths and trying to recall how to calculate Z for a box-cox distribution (LMS). For a given LMS how do I get the Z...

    Started by daninmanchester‎, 01-03-2015 02:49 PM
    box-cox, lms
    • Replies: 0
    • Views: 1,727
    01-03-2015, 02:49 PM Go to last post
  21. Creating a index variable/metric from a concept

    I am seeking help in deriving/designing an index variable/metric based on the concept below. I am trying to create a variable that measures...

    Started by tiffanyjung‎, 01-03-2015 02:13 PM
    • Replies: 0
    • Views: 1,338
    01-03-2015, 02:13 PM Go to last post
  22. SPSS output problem

    Hello, I'm doing a university assignment where we've received a certain SPSS output and we have to write a report on it (including results...

    Started by Altism‎, 01-01-2015 08:18 PM
    spss colinearity
    • Replies: 2
    • Views: 1,242
    01-03-2015, 05:18 AM Go to last post
  23. one sample median test for a Likert item?

    Today I was trying to figure out which test would be appropriate if you have an ordinal variable and want to test if the median could be equal to a...

    Started by blubblub‎, 01-02-2015 07:32 AM
    median test
    • Replies: 1
    • Views: 1,702
    01-02-2015, 08:45 AM Go to last post
  24. R code

    How does the code in R work? Why does it take 3 values? 0:2/5 0.0 0.2 0.4

    Started by Cynderella‎, 01-02-2015 12:35 AM
    r software
    • Replies: 1
    • Views: 1,233
    01-02-2015, 08:28 AM Go to last post
  25. How to prove random sample is out of known population?

    Hi! I hope this is the correct board to discuss this kind of problem. I have some random samples and a known population. Problem is some of the...

    Started by Pseudoderm‎, 01-01-2015 07:26 PM
    • Replies: 2
    • Views: 1,464
    01-01-2015, 09:55 PM Go to last post
  26. Pop corn vs Chocolate. Which statistical test?

    Hello all. I have a couple of questions regarding what statistical tests to use for a three-part problem. I would very much appreciate any help....

    Started by newbiestat‎, 12-28-2014 01:49 PM
    3 Pages
    1 2 3
    • Replies: 37
    • Views: 7,113
    01-01-2015, 02:57 PM Go to last post
  27. Chi-Square or Binomial? Data is counts of observations and lots of zeros. Solution?

    Hi, I have done a behavioural study on four fish to determine their sex. I paired the fish together so they were introduced to all others in turn...

    Started by Carolyn63‎, 12-31-2014 06:37 AM
    • Replies: 1
    • Views: 1,668
    12-31-2014, 07:58 AM Go to last post
  28. Help with GLM

    Hi everyone, This is the first time I am posting here, but hopefully you can help! I am running a GLM in SPSS on a data set on owl survey...

    Started by John Osbone‎, 12-31-2014 06:38 AM
    • Replies: 1
    • Views: 1,294
    12-31-2014, 07:54 AM Go to last post
  29. Meta-analysis of group contrasts

    I'm looking at a meta-analysis of randomized trials that consist of comparing two treatments for a disorder (i.e., behavioral treatment versus a...

    Started by PikeyJM‎, 12-30-2014 02:08 PM
    • Replies: 0
    • Views: 1,242
    12-30-2014, 02:08 PM Go to last post
  30. Hypothesis Test for multiple options rankining question

    O.k I got it

    Started by RCS‎, 12-30-2014 10:52 AM
    • Replies: 0
    • Views: 2,024
    12-30-2014, 10:52 AM Go to last post
  31. Significance between multiple groups

    Hi Guys, I have an okay understanding of statistics but struggled with this one as it is not something I have done before, any help or pointers...

    Started by AndrewDus‎, 12-30-2014 07:56 AM
    significance testing
    • Replies: 1
    • Views: 1,086
    12-30-2014, 08:58 AM Go to last post
  32. Which statistical analysis should be used?

    Hello everyone I have seven localities from which I collected different species of plants (small number of species aout 30) I want to include some...

    Started by Anawi‎, 12-15-2014 12:02 PM
    • Replies: 4
    • Views: 1,962
    12-29-2014, 10:18 AM Go to last post
  33. Guidance with a random variable problem needed

    Hello. So I have been trying to solve this problem on my statistics course and I'm having a lot of trouble: "In BME Bioinstrumentation lab, each...

    Started by Psychic Lobster‎, 12-28-2014 07:34 AM
    homework help, random variables, variance
    • Replies: 2
    • Views: 2,064
    12-29-2014, 04:57 AM Go to last post
  34. Using Chi-square test for testing correlation between more than two variables

    Hi, I don't have deep knowledge in statistic, and I have been googling for an answer to my question, but i got no luck. Hopefully i found an answer...

    Started by SandraH‎, 12-28-2014 02:20 PM
    chi-square, contingent table, correlation
    • Replies: 2
    • Views: 2,619
    12-28-2014, 05:23 PM Go to last post
  35. Want to learn more about Data Mining BIGDATA 101 Suggest book/exercise/project?

    So far, I know how to do single and multi-variable regression in Excel, in order to generate an equation that can be used to calculated expected...

    Started by CrunchAndSee‎, 12-27-2014 04:57 PM
    • Replies: 1
    • Views: 1,496
    12-27-2014, 10:46 PM Go to last post
  36. Stream temperature over time: is a repeated measures ANOVA my best bet?

    I am trying to analyze temperature data across 5 sites taken over approximately 4 months and am having trouble working out the best test to use (I'm...

    Started by dsilver‎, 12-23-2014 11:27 AM
    ecological statistics, nested analysis, repeated measure anova, temperature
    • Replies: 3
    • Views: 2,702
    12-27-2014, 10:22 AM Go to last post
  37. Multivariate techniques on overlapping data?

    Hello, I am involved in a study where the DV is performance on a word recall test (#words recalled out of 10), and we are comparing 2 groups of...

    Started by jcr‎, 12-24-2014 08:21 PM
    • Replies: 1
    • Views: 1,056
    12-25-2014, 09:33 PM Go to last post
  38. Excel formula for the inverse Pearson IV distribution?

    Hello Everyone, What is the excel formula to generate the inverse Pearson IV distribution? I have mean, standard deviation, skew and kurtosis and...

    Started by ddurant100‎, 11-04-2014 07:54 AM
    excel, kurtosis, pearson, skew
    • Replies: 7
    • Views: 4,147
    12-24-2014, 07:20 PM Go to last post
  39. How can I compare variability of data before & after an intervention within a subject

    Hi, I'm trying to analyse some patient data I've collected. Basically, I've got beat by beat heart rate readings before and after an...

    Started by rjdockry‎, 12-24-2014 05:28 AM
    • Replies: 4
    • Views: 1,386
    12-24-2014, 06:49 AM Go to last post
  40. Post-hoc after ANOVA < 0.05

    Working on tests for some survey questions for a dissertation. I am able to reject one Hypothesis with a 0.042 One way ANOVA. I have 5 groups in...

    Started by novadar‎, 12-15-2014 03:49 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,141
    12-23-2014, 06:49 PM Go to last post
  41. McNemar test and all the variations, is mid-p indeed the best?

    After a long search I think I finally got this right, but would like to know for sure. I've been trying to sort out all the variations on the McNemar...

    Started by blubblub‎, 12-23-2014 09:45 AM
    mcnemar
    • Replies: 1
    • Views: 2,437
    12-23-2014, 11:11 AM Go to last post
  42. What statistical method to use in SPSS?

    Hello everybody here, l am new in staitistics, and l am working on an assignment to test volunteering behaviour of people in Country 1. I am...

    Started by Manjola‎, 12-17-2014 08:17 AM
    • Replies: 1
    • Views: 1,416
    12-23-2014, 10:08 AM Go to last post
  43. ARMA one step ahead forecast and forecast error

    For a ARMA(1,1) process with constant \theta is X_t=\alpha X_{t-1}+\theta +Z_t+\beta Z_{t-1} where Z_T is white noise with mean 0 and...

    Started by Clarkson‎, 12-23-2014 07:15 AM
    arma model, forecast error, forecasting, time series
    • Replies: 0
    • Views: 959
    12-23-2014, 07:15 AM Go to last post
  44. Comparing primary and secondary data?

    Hi! I am writing scientific paper about franchising in Serbia and USA. I will have primary data for Serbia (questionaire) and secondary data for USA...

    Started by Milica88‎, 12-22-2014 03:17 PM
    • Replies: 1
    • Views: 983
    12-22-2014, 08:29 PM Go to last post
  45. Non-parametric repeated measures guidance needed

    What I am studdying is Aspergillosis (a disease) -it is caused by the terrestrial soil fungus called Aspergillus sydowii - of the sea fan Gorgonia...

    Started by Moriah‎, 12-22-2014 07:46 PM
    jmp, non-parametric, repeated measures, spatial, temporal
    • Replies: 0
    • Views: 1,429
    12-22-2014, 07:46 PM Go to last post
  46. Question Gamma expectation

    Hi, I need to find the expection of 1/Y where Y is distributed by Gamma with parameters \alpha and y. Do I need to find the pdf of 1/Y by using...

    Started by MathJack‎, 12-21-2014 09:27 PM
    • Replies: 1
    • Views: 1,128
    12-21-2014, 10:50 PM Go to last post
  47. Predicting the increase/decrease of number

    I have these entries in my database that looks like this: ItemID Coefficient Time 14 1.74 "2014-12-21 17:13:29" 14 1.73 ...

    Started by Charmees‎, 12-21-2014 12:13 PM
    • Replies: 0
    • Views: 1,290
    12-21-2014, 12:13 PM Go to last post
  48. Loglinear Analysis

    Hi, I work in a university and am trying to analyse a dataset that contains data for a number of years on whether students perform sufficiently...

    Started by statslearner100‎, 12-20-2014 10:05 AM
    • Replies: 0
    • Views: 1,099
    12-20-2014, 10:05 AM Go to last post
  49. Basic Measurement Error when calculating the Mean

    Hi all, I have a question about measurement error and how it can play a role when calulating the error of the mean. I have an automated process...

    Started by cp51‎, 12-16-2014 12:01 PM
    • Replies: 6
    • Views: 1,858
    12-19-2014, 12:12 PM Go to last post
  50. Question What's the phenomenon when something is less likely to occur as time goes on?

    Let's say my friend says "I'll probably call you today". It's 8am. There's some % chance of him calling before 5pm. Let's say that's X%. So...

    Started by billybass‎, 12-18-2014 04:08 PM
    • Replies: 1
    • Views: 1,250
    12-19-2014, 11:55 AM Go to last post
  51. Calculating effect size when there are multiple outcomes

    Hi, I'm trying to work the effect size for a study in which there are several outcomes for the same intervention. The intervention is a strength...

    Started by Darkest Horse‎, 12-17-2014 07:55 AM
    • Replies: 1
    • Views: 1,126
    12-19-2014, 04:57 AM Go to last post
  52. Calculating an Attendance Factor -Please Help.

    Hello, I am calculating an attendance factor by dividing the average daily attendance by the highest single daily attendance occurrence. eg. ...

    Started by mike1199‎, 12-18-2014 04:56 PM
    • Replies: 2
    • Views: 1,982
    12-18-2014, 06:18 PM Go to last post
  53. Lightbulb method/metric of comparing two random samples and their impact

    Hello I have the following problem - given a set S of N=100000 data elements I need to extract a random sample R of size n=20 and then for each...

    Started by sorin‎, 12-18-2014 09:45 AM
    random sample comparison
    • Replies: 0
    • Views: 1,102
    12-18-2014, 09:45 AM Go to last post
  54. Question Covariance of two variables, multiple individuals

    I have a data set with two variables (A and B), but variable B was measured for multiple individuals (B1, B2, B3, B4). Is there a way to calculate a...

    Started by itendswithe‎, 12-16-2014 05:29 PM
    • Replies: 3
    • Views: 1,651
    12-17-2014, 06:38 PM Go to last post
  55. Question Selecting a median curve?

    Interested to see how people would do this... :confused: I have fitted a number of curves to my data sets, and plotted them together. What I...

    Started by yccmp‎, 12-17-2014 05:28 PM
    • Replies: 1
    • Views: 1,118
    12-17-2014, 06:29 PM Go to last post
  56. Basic question: is the std of complex numbers the std of its components?

    Sorry for the basic question, I searched the internet but could not get a simple and clear answer. Application: I want to compute the std of a...

    Started by yaraeovento‎, 12-17-2014 03:11 PM
    angle, complex numbers, standard deviation
    • Replies: 1
    • Views: 1,194
    12-17-2014, 05:19 PM Go to last post
  57. Changing a target value that minimize the product being outside the specifications in

    I was doing problems in the article here. http://elearning.vtu.ac.in/10/enotes/06IPIM65/Mod10-NVN.pdf In the question on page 16

    Started by Clarkson‎, 12-17-2014 06:52 AM
    control chart, quality
    • Replies: 0
    • Views: 1,559
    12-17-2014, 06:52 AM Go to last post
  58. Finding ciritical W Values for Shapiro Wilk Test

    Hey, my first post here =) First off all, english is not my first language, so it is difficult for me to translate the scientific terms into...

    Started by JanJan‎, 12-17-2014 06:31 AM
    • Replies: 0
    • Views: 1,174
    12-17-2014, 06:31 AM Go to last post
  59. Analysis of possible variables causing incorrect test results (false-positive etc)

    Dear geniuses, Thank you in advance to hearing my plea. First off, I'm new to the world of statistics, so if possible please keep it plain and...

    Started by BasW‎, 12-16-2014 02:56 PM
    • Replies: 3
    • Views: 1,227
    12-16-2014, 04:16 PM Go to last post
  60. Comparing regression equations

    Hello! I have a question about how to compare regression equations and regression coefficients. I have data set A with n data points, and two...

    Started by smm106‎, 12-16-2014 03:28 PM
    coefficients, hypothesis testing, regression equation
    • Replies: 0
    • Views: 1,201
    12-16-2014, 03:28 PM Go to last post

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