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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: 196,569
    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: 66,624
    09-30-2005, 09:44 AM Go to last post
  1. Assignment help

    Delete thread please

    Started by hawkinswharf‎, 04-11-2013 11:37 AM
    • Replies: 0
    • Views: 943
    04-11-2013, 11:37 AM Go to last post
  2. Urgent help

    I have 30 participants and 45 test items. The test items were divided into low, mid, and high frequencies. I want to investigate if there is a...

    Started by kaka‎, 04-08-2013 08:05 AM
    • Replies: 4
    • Views: 1,180
    04-11-2013, 10:51 AM Go to last post
  3. statistics

    A study was conducted with children in Year 1, 2 and 3 of primary. Twenty Year 1, 20 Year 2 and 20 Year 3 children took maths and science tests. The...

    Started by Balloon15‎, 04-10-2013 07:34 AM
    • Replies: 3
    • Views: 1,294
    04-11-2013, 10:14 AM Go to last post
  4. nonparametric equivalent for 2x2 between subjects ANOVA

    Dear Forum Members, I am looking for a nonparametric equivalent of 2x2 between subjects ANOVA. The dependent variable is ordinal and negatively...

    Started by Pinar Acar‎, 04-11-2013 02:02 AM
    • Replies: 5
    • Views: 3,191
    04-11-2013, 09:23 AM Go to last post
  5. Lightbulb Population Growth

    First of all this is not for homework. I had a stupid thought and wanted to test something. I started thinking if over 50 years for ever 2 people...

    Started by Napivo‎, 04-11-2013 09:13 AM
    • Replies: 0
    • Views: 844
    04-11-2013, 09:13 AM Go to last post
  6. Statistics Hypothesis Testing

    So I have these sets of values and i was wanting to make sure i was interpreting my data correctly. The first set has my std and mean along with my f...

    Started by xz4chx‎, 04-10-2013 04:41 PM
    • Replies: 5
    • Views: 1,915
    04-11-2013, 06:46 AM Go to last post
  7. Repeated measures ANOVAs and checking for gender effect

    Hi everyone, (I apologize in advance for the errors, english is not my first language) Help! :eek: Im at the step of analyzing my data, but...

    Started by empi‎, 04-10-2013 12:37 PM
    • Replies: 4
    • Views: 1,645
    04-11-2013, 03:10 AM Go to last post
  8. Question About Degree Of Freedom

    I know it's used for the T-interval but I have a question. Even if the sample is for example 547, would I do 547-1? For the degree of freedom when...

    Started by PSG‎, 04-10-2013 10:59 PM
    • Replies: 1
    • Views: 1,116
    04-11-2013, 12:11 AM Go to last post
  9. Is this correct?- Kriskal Wallis Test

    I want to compare multiple groups pre-intervention and post-intervention, to see which intervention was the most effective. So I calculated the...

    Started by 03turnerS‎, 04-10-2013 08:19 PM
    • Replies: 1
    • Views: 1,294
    04-10-2013, 09:19 PM Go to last post
  10. Method of Moments

    Question: Let X1, X2, ... , Xn be a random sample of size n from a population with pdf f(x;theta) = / (theta)^3 from 0 < x < theta and zero...

    Started by StatsLove‎, 04-10-2013 09:00 PM
    help me!, method of moments, pdf, point estimator, stats
    • Replies: 0
    • Views: 1,218
    04-10-2013, 09:00 PM Go to last post
  11. Dealing with Zero Values in a G-test

    Hello, I am dealing with some zero values which are not valid in a G-test. Is it appropriate to substitute zero with a 0.000001 for example? I...

    Started by ~alan~‎, 04-10-2013 08:59 PM
    • Replies: 0
    • Views: 1,383
    04-10-2013, 08:59 PM Go to last post
  12. Some Help Please

    In A Random Sample of 678 ADULT MALES 20 TO 34 Years of age, it was deermined that 58 of them have hypertension. Part C- You wish to conduct...

    Started by PSG‎, 04-10-2013 01:59 PM
    • Replies: 2
    • Views: 2,623
    04-10-2013, 06:10 PM Go to last post
  13. Multilevel models help

    I am in a situation where I have an outcome variable (dichotomous) that has been measured in different centers (group variable). Here it is a...

    Started by Alex C‎, 04-09-2013 02:14 PM
    • Replies: 3
    • Views: 1,326
    04-10-2013, 04:07 PM Go to last post
  14. Significance Testing of Fourier Transform

    Hi everyone- I am doing vibration analysis of a device and have collected data via an accelerometer. I do a fourier transform to get my data into the...

    Started by cspin‎, 04-10-2013 08:10 AM
    • Replies: 0
    • Views: 1,190
    04-10-2013, 08:10 AM Go to last post
  15. Liklyhood with small varince in Bayisan

    We are trying to set up a Bayesian problem, but the problem we think there is we have a likelihood where the covariance, given by the data set, is...

    Started by charanrajt‎, 04-09-2013 12:29 AM
    • Replies: 1
    • Views: 1,415
    04-10-2013, 07:44 AM Go to last post
  16. Question Mean of sample means

    Hello everyone! :) I don't know how to find mean of sample means! Here I did only frequency table.Here is the task( in attachment)

    Started by Lisa92‎, 04-10-2013 06:47 AM
    • Replies: 0
    • Views: 1,263
    04-10-2013, 06:47 AM Go to last post
  17. Homework Help

    2. For ten years from 1992 to 2001 A.J.Jones has kept a record of several variables. Here are his data on the average gasoline price in cents per...

    Started by DillonJaber76‎, 04-09-2013 10:03 PM
    • Replies: 1
    • Views: 1,364
    04-10-2013, 02:49 AM Go to last post
  18. Advice/help

    Hi all first post from a complete statistics-phobe, I'm just looking for a little advice pointing in the right direction. I'm a first year teacher...

    Started by timmyotool‎, 04-09-2013 07:28 AM
    • Replies: 2
    • Views: 1,291
    04-09-2013, 04:40 PM Go to last post
  19. leveraging logistic results

    Here are the results of a logistic regression Number of Observations Used 97091 Response Profile Ordered Value buy Total Frequency...

    Started by just_joined‎, 04-09-2013 04:23 PM
    logistic regression
    • Replies: 0
    • Views: 1,309
    04-09-2013, 04:23 PM Go to last post
  20. Comparing means on different measurement scales?

    I'll try my best to keep this as clear as possible. I have two groups of people divided according to age: teenagers and pensioners. I want to...

    Started by balanar‎, 04-09-2013 10:21 AM
    • Replies: 1
    • Views: 3,110
    04-09-2013, 10:39 AM Go to last post
  21. Using SPSS to calculate P value? How to do it?

    I'm using the SPSS software, and I have been given two columns of data e.g. one column for weight and the other for height how would I go about...

    Started by romeor2k‎, 04-09-2013 05:37 AM
    • Replies: 1
    • Views: 9,597
    04-09-2013, 09:54 AM Go to last post
  22. Kolmogorov-Smirnov test

    Dear all, I need to apply the Kolmogorov-Smirnov test to a set of data in order to verify if the data has a normal distribution. The data have...

    Started by Liza‎, 04-08-2013 09:32 AM
    • Replies: 7
    • Views: 3,254
    04-08-2013, 07:14 PM Go to last post
  23. For Coca Cola project-Need help with SPSS

    I desperately need help with my project analysis. I have tried doing factor analysis on the data I have, but it shows up errors and the output is not...

    Started by srilu121‎, 05-26-2011 03:04 AM
    • Replies: 3
    • Views: 2,537
    04-08-2013, 06:29 PM Go to last post
  24. Simulating with or without subgroups?

    Hi! I'm trying to do some basic monte carlo. I've seen two ways of going about it, and I'm not sure if one has particular benefits. I'm also...

    Started by hassafrass‎, 04-08-2013 03:16 PM
    • Replies: 0
    • Views: 987
    04-08-2013, 03:16 PM Go to last post
  25. Updating covariance matrix when more info becomes available.

    Say, I have a solution to a 3D problem in the form of a a triple (x0,y0,z0) with uncertainty specified by an error covariance matrix S. Using these...

    Started by Kolin‎, 04-08-2013 02:55 PM
    covariance matrix, intersect, multivariate, normal, update
    • Replies: 0
    • Views: 1,105
    04-08-2013, 02:55 PM Go to last post
  26. Chi-squared test for multiple samples?

    I have a problem that I can't seem to find an answer to in my statistics books or via Google, so I thought you guys might be able to help. I have...

    Started by Orngarth‎, 11-01-2010 07:19 PM
    • Replies: 6
    • Views: 12,606
    04-08-2013, 01:50 PM Go to last post
  27. How do I arrive at a winner from this?

    Hi Guys, I've been asked to do a poll/rating system for some local site that reviews restaurants. We'll be using those 5 stars you can click on...

    Started by nordy‎, 04-08-2013 01:15 AM
    • Replies: 0
    • Views: 1,623
    04-08-2013, 01:15 AM Go to last post
  28. Model for two way table

    Suppose you have data in the following format: <60 60-69 70-79 80-89 90-99 No Exercise 5 10 2 4 1 Moderate ...

    Started by lord12‎, 04-08-2013 12:58 AM
    • Replies: 0
    • Views: 1,301
    04-08-2013, 12:58 AM Go to last post
  29. Best Way To Tell The Difference From T and Z intervals

    Okay, both steps are basically the same, I got the formulas. But what is the best way to tell which is which? I know it is the STD is known(sigma...

    Started by PSG‎, 04-07-2013 07:25 PM
    • Replies: 1
    • Views: 1,259
    04-07-2013, 11:58 PM Go to last post
  30. Some Help Please

    It's for part B, where is the .25 coming from? I am a bit lost. I did the work for part A and got the answer correct, but part B is throwing me off.

    Started by PSG‎, 04-06-2013 07:43 PM
    • Replies: 2
    • Views: 1,240
    04-07-2013, 07:26 PM Go to last post
  31. Simple Main Effects - How to Report this One Data Set?

    Attached is a Photo of the data set i wish to report. Am i correct in thinking i report this simple main effects data as it stands? i.e.: "For...

    Started by timclacy‎, 04-07-2013 06:26 PM
    • Replies: 0
    • Views: 1,936
    04-07-2013, 06:26 PM Go to last post
  32. Two-Way ANOVA Post Hoc Tests Won't Run

    I have run a two-way ANOVA in SPSS Independent: - Exercise Participation (3xGroups) - Age (4xGroups) Dependant: - Confidence Levels This...

    Started by timclacy‎, 04-05-2013 07:16 PM
    • Replies: 3
    • Views: 5,775
    04-07-2013, 06:18 PM Go to last post
  33. Variance

    I have a question, can't figure out how to do it, tried several things... to the numbers 0 and 2, you need to join a third number, such that the...

    Started by Yankel‎, 04-07-2013 12:57 PM
    • Replies: 2
    • Views: 1,382
    04-07-2013, 01:59 PM Go to last post
  34. How do I measure 'escalation' or 'shortening intervals' in data?

    Hi there, Not sure I'm phrasing my question correctly in the thread title.........so I'll briefly explain. I have a dataset of rail signal point...

    Started by Baleineau‎, 04-06-2013 07:33 PM
    • Replies: 4
    • Views: 1,294
    04-07-2013, 01:01 PM Go to last post
  35. Discrete uniform distribution - completeness

    I am working on the following problem. Suppose that X_{1},...,X_{n} IID X where X~Unif{1,...,\theta}, \theta \in \mathbb{N}. Let...

    Started by GTaiko‎, 04-06-2013 11:41 PM
    • Replies: 3
    • Views: 3,242
    04-07-2013, 12:16 PM Go to last post
  36. Correlation coefficient of X Y,Z

    the correlation coefficient of X Y is 0.6, and the correlation coefficient of Y Z is 0.7, what is the range of the correlation coefficient of X and...

    Started by pepsico007‎, 03-13-2013 10:08 PM
    correlation coefficient
    • Replies: 4
    • Views: 1,987
    04-07-2013, 10:34 AM Go to last post
  37. Help with Stats Assignment

    I posted this in the Psych Stats area, but thought it might be better here ... any help or advice is greatly appreciated I came across this forum...

    Started by Agape000‎, 04-06-2013 10:17 PM
    • Replies: 0
    • Views: 876
    04-06-2013, 10:17 PM Go to last post
  38. practice problems on linear model topics

    Hi, I am a first year stats grad student and I am taking a class on linear models. The book and lectures focus on definitions and proofs....

    Started by libragirl‎, 04-06-2013 08:30 PM
    • Replies: 0
    • Views: 842
    04-06-2013, 08:30 PM Go to last post
  39. Normal Distribution.. need calc/learning HELP!

    can someone teach me how to use my ti-84 plus calculator to find each step? id greatly appreciate it. thanks!

    Started by kspodvin‎, 04-06-2013 02:51 PM
    • Replies: 2
    • Views: 1,579
    04-06-2013, 03:02 PM Go to last post
  40. Please help with Homework: Hypothesis Testing with Multivariable Regression

    Hi, I stumbled upon this forum upon a Google Search while trying to get help with my homework. I hope I can get help here; I have been stuck for...

    Started by forthewinwin‎, 04-06-2013 03:34 AM
    • Replies: 0
    • Views: 1,131
    04-06-2013, 03:34 AM Go to last post
  41. If two variables have the same effect on the dependent variable

    Hi I don't need a long explanation just enough to point me to the right direction to solving my question. The question is: Determine if income...

    Started by northbiker‎, 04-06-2013 12:25 AM
    • Replies: 0
    • Views: 2,141
    04-06-2013, 12:25 AM Go to last post
  42. Talking How to interpret a standardized multiple regression coefficient

    How can I write an interpretation of the standardized multiple regression equation for both Age of Child and Number of Siblings in this model: ...

    Started by Alycat‎, 04-04-2013 06:44 AM
    coefficient, interpret, multiple, regression, standardized
    • Replies: 4
    • Views: 36,454
    04-05-2013, 09:34 PM Go to last post
  43. How do I calculate this enormous P-value?

    Hello, I have the following data and want to perform a Poisson dispersion test. ...

    Started by S-C-3-1-3‎, 04-04-2013 05:38 PM
    • Replies: 2
    • Views: 2,074
    04-05-2013, 04:28 PM Go to last post
  44. how to know when to square a variable in an MLS

    in a multiple linear regression, I notice that occasionally a variable will appear as it is, and also as a squared version of itself. This is...

    Started by kingsolomonsgrave‎, 04-05-2013 03:30 PM
    • Replies: 0
    • Views: 991
    04-05-2013, 03:30 PM Go to last post
  45. 2 Sample T Test for Nonnormal data

    Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

    Started by goducks13‎, 04-05-2013 02:32 PM
    • Replies: 0
    • Views: 1,273
    04-05-2013, 02:32 PM Go to last post
  46. reading significance values for partial correlation coefficitns

    in Stata the pcorr command gives significance levels with the partial correlation coefficients between variables. How do I read these significance...

    Started by kingsolomonsgrave‎, 04-05-2013 12:49 PM
    • Replies: 0
    • Views: 1,412
    04-05-2013, 12:49 PM Go to last post
  47. summary statistics for dummy variables

    If I have a dummy variable that is 1 for true and 0 for false of a certain characteristic of a set of data, can I interpret summary statistics like...

    Started by kingsolomonsgrave‎, 04-05-2013 12:12 PM
    • Replies: 0
    • Views: 1,494
    04-05-2013, 12:12 PM Go to last post
  48. Help: Dummy Variable Regression with two components

    Here is the question: I was thinking it might look something like Y=B0+B1D+B2(X1i.D)...

    Started by anon_ch‎, 04-05-2013 08:47 AM
    • Replies: 1
    • Views: 1,184
    04-05-2013, 10:33 AM Go to last post
  49. Why does a larger sample size produce a smaller p-value?

    Hi, I need help with this problem... The obtained p value for a correlation analysis is .036, for a sample size is 50. If the analysis had been...

    Started by Alycat‎, 04-04-2013 06:37 AM
    correlation, p value, sample size
    • Replies: 2
    • Views: 5,104
    04-05-2013, 05:55 AM Go to last post
  50. Cluster analysis and statistical test

    Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

    Started by frans‎, 04-03-2013 03:36 AM
    • Replies: 5
    • Views: 2,113
    04-05-2013, 05:25 AM Go to last post
  51. Arrow Sampling design question

    1.what is the difference between stratified and systematic sampling

    Started by zafarali‎, 04-05-2013 02:54 AM
    • Replies: 0
    • Views: 1,241
    04-05-2013, 02:54 AM Go to last post
  52. Variance between two time series (action and feedback)

    I would like to know how find the variance between two (or more) time series. I have a series of timings (in milliseconds) which represent the...

    Started by chdebezenac‎, 04-05-2013 02:32 AM
    time series, variance
    • Replies: 0
    • Views: 2,242
    04-05-2013, 02:32 AM Go to last post
  53. Variable transformation

    Hi all, I've got a question concerning variable transformation: In many books it is recommended to use variable transformation, if your data is...

    Started by sternchen‎, 04-05-2013 02:12 AM
    • Replies: 0
    • Views: 974
    04-05-2013, 02:12 AM Go to last post
  54. Potential confounding factor in study - am I analyzing this data properly?

    I have conducted an experiment regarding the effects of tag size on fish survival (sample size = 90 fish), which I have simplified for ease of...

    Started by semaj‎, 04-04-2013 09:23 PM
    • Replies: 0
    • Views: 941
    04-04-2013, 09:23 PM Go to last post
  55. Zero-inflation models

    Hi everyone, I've been researching these more and more due to some unusual data I have, but have a fairly overarching question I seem unable to find...

    Started by Ollie123‎, 04-04-2013 06:38 PM
    • Replies: 2
    • Views: 1,362
    04-04-2013, 08:25 PM Go to last post
  56. Understanding which simple effect to do and why

    I've been struggling to figure out which simple effect test to do for my assignment, and most importantly why. The hypothesis is that the effect...

    Started by Lyric-less‎, 04-03-2013 08:59 PM
    • Replies: 3
    • Views: 1,178
    04-04-2013, 07:08 PM Go to last post
  57. Question abour Anderson Darling test

    Is k sample Anderson Darlıing test equavelent to Kruskal wallis test? Can I perform k sample Anderson darling test for comparing k groups instead of...

    Started by avatar_avatar‎, 04-04-2013 04:00 PM
    • Replies: 0
    • Views: 1,292
    04-04-2013, 04:00 PM Go to last post
  58. How to Statistica calculated P(significance) value in Duncan's multiple range test?

    Hi, I'm working on a program for statistical calculations.Always have two sets of data... I calculated all the other values ​​from ANOVA and...

    Started by psycho‎, 04-04-2013 02:58 PM
    • Replies: 0
    • Views: 2,163
    04-04-2013, 02:58 PM Go to last post
  59. 2x3 factorial design

    Hi, I need to analyse a 2x3 factorial design of an experimental group and a control group, doing 3 serial recall tests over time. so far I've used...

    Started by srg1991‎, 04-04-2013 01:31 PM
    anova, factorial design, spss, statistics
    • Replies: 0
    • Views: 2,407
    04-04-2013, 01:31 PM Go to last post
  60. Will a t-test (or nonparametric equivalent) work for me?

    I am trying to measure whether individual scores on a behavioural scale are statistically different from the average (median) score on that scale. ...

    Started by galgani‎, 04-04-2013 08:45 AM
    • Replies: 2
    • Views: 1,317
    04-04-2013, 11:06 AM Go to last post

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