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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: 196,672
    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: 66,691
    09-30-2005, 09:44 AM Go to last post
  1. ARMA processes - What does Universal Approximation mean

    Hello, I read in a book that AR, MA and ARMA processes are universal approximations of stationary time series. What does the universal...

    Started by zarasandreas‎, 09-07-2011 05:53 AM
    • Replies: 2
    • Views: 3,637
    09-07-2011, 06:42 AM Go to last post
  2. ARMA Question

    Hi guys, I would really appreciate your input into this I have a question which instructs me to construct an ARMA model based on a regression...

    Started by statman1999‎, 05-10-2015 09:55 PM
    • Replies: 0
    • Views: 1,222
    05-10-2015, 09:55 PM Go to last post
  3. Artificially create biased sample for low response

    Hi all, I am building a binary 0/1 logistic model where the response rate is very low (0.6%, 77000 out of 12000000). One suggestion was to...

    Started by anindya_mozumdar‎, 05-15-2007 09:29 AM
    • Replies: 0
    • Views: 2,272
    05-15-2007, 09:29 AM Go to last post
  4. As part of a public health survey, a random sample of college students were asked abo

    The following results were obtained: Gender of Student Never < 3 Drinks 3+ Drinks per Week per Week Men 116 ...

    Started by missremeber‎, 01-11-2016 09:56 PM
    • Replies: 1
    • Views: 2,039
    01-11-2016, 10:06 PM Go to last post
  5. Question AS Statistics - Time Series Analysis (S2)

    Hello all My teacher was teaching us Time Series Analysis qiute a while ago and when he was explaining it i didn't understand properly and didn't...

    Started by aadd‎, 05-09-2007 10:24 AM
    • Replies: 0
    • Views: 4,170
    05-09-2007, 10:24 AM Go to last post
  6. ASAP-Help :(

    Help me please, how will I stand on the results of my quantitative research? I have a sample size of N=46, and the results shows that there is no...

    Started by blueberrylove‎, 02-06-2015 05:05 AM
    statistics
    • Replies: 3
    • Views: 1,263
    02-06-2015, 09:50 AM Go to last post
  7. Asisstance really needed

    I have worked on this problem for the last 3 days and pulling my hair out. Can someone please assist me in this problem. If I am in the wrong area,...

    Started by drkbronze‎, 11-13-2011 02:54 PM
    • Replies: 2
    • Views: 2,141
    11-13-2011, 04:54 PM Go to last post
  8. Assay qualification and validation - (paid?!) Help required

    Dear all, I have some really interesting data on a series of new urine tests that I require some statistical help with. I need to get the project...

    Started by BioMark‎, 03-15-2010 07:12 AM
    • Replies: 1
    • Views: 4,152
    03-15-2010, 10:52 AM Go to last post
  9. assaying result and statistics help

    All, I have a chemical result for a group of samples I have sent out to a lab, equal numbers of sample was selected and sent out. Now if the...

    Started by kjavanb123‎, 09-07-2011 04:46 AM
    • Replies: 0
    • Views: 1,440
    09-07-2011, 04:46 AM Go to last post
  10. Assesing agreement betwen two methods

    How can I calculate limits-of-agreement, described by Bland & Altman? An example with the process will be nice. Thanks

    Started by naj‎, 05-29-2009 11:15 AM
    • Replies: 0
    • Views: 2,070
    05-29-2009, 11:15 AM Go to last post
  11. Assess hedonic regression

    Hi, I'm going to be involved in an asssignment using hedonic regression on real estate appraisal. It is a part of an index for dwellings. My task...

    Started by opelastra‎, 11-24-2012 05:17 PM
    • Replies: 1
    • Views: 1,375
    11-24-2012, 05:18 PM Go to last post
  12. Assess statistical significance of two PPVs

    I recently validated a medical diagnosis in order to compose a study population. To do so, we classified each patient with a diagnosis of interest as...

    Started by marsh_randy‎, 09-13-2016 09:23 AM
    difference, positive predictive value, test of significance, validation
    • Replies: 2
    • Views: 991
    09-13-2016, 01:57 PM Go to last post
  13. Assessing equivalency on pre-test

    Hi, I am running an independent samples t-test on scores on a post-test continuous measure for two groups...there was no random assignment...

    Started by derekcruise‎, 11-05-2015 05:49 PM
    • Replies: 8
    • Views: 1,115
    11-05-2015, 11:37 PM Go to last post
  14. Assessing variability between non-normally distributed samples

    I am trying to assess the difference in the dispersion or variance of 2 datasets taken from different sites. Because they are not normally...

    Started by volatile.‎, 02-08-2013 10:59 PM
    • Replies: 0
    • Views: 1,224
    02-08-2013, 10:59 PM Go to last post
  15. Assigment Question

    Good Afternoon , I'm currently taking a stat class and I can not get the answer for this question , can someone help me: -- At one college ,...

    Started by victor1390‎, 07-04-2015 07:25 PM
    • Replies: 2
    • Views: 1,497
    07-05-2015, 02:40 AM Go to last post
  16. Question Assigning numerical ranks to ordinal question categories for analysis purposes

    Hello all, I am working on a dissertation on parent involvement types. My data is derived from a self-administered survey. I wrote responses to...

    Started by GDP9‎, 03-29-2014 09:42 AM
    • Replies: 0
    • Views: 1,322
    03-29-2014, 09:42 AM Go to last post
  17. Assigning outliers in very few datapoints

    Hi, I'm a geology PhD student and i have a problem with making my dataset statistically robust. I'm measuring element concentration of my...

    Started by Bberg‎, 07-10-2013 08:04 AM
    outlier detection, outliers, robust statistics, small sample size
    • Replies: 2
    • Views: 2,242
    07-10-2013, 12:20 PM Go to last post
  18. assigning to a variable number of populations

    I need some help. Our University has a free statistical help staff ... but as usual, they are useless because they are closed until April Fool's...

    Started by dtvmcdonald‎, 03-20-2010 04:26 PM
    • Replies: 0
    • Views: 2,143
    03-20-2010, 04:26 PM Go to last post
  19. Assigning weights to variables

    Hi all, I'm not a statistician, but just trying to get help on an analysis I'm running, so I apologize ahead of time if this question is basic,...

    Started by jjcinnj‎, 06-11-2011 12:49 PM
    • Replies: 4
    • Views: 24,334
    06-11-2011, 02:57 PM Go to last post
  20. Assignment

    Hi i recently have gotten help from some helpful people (thank you guys, still working on it but hit a wall so i working on my second question) ...

    Started by woozi‎, 11-21-2010 06:53 PM
    • Replies: 2
    • Views: 2,413
    11-24-2010, 12:31 PM Go to last post
  21. 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: 2,342
    11-24-2016, 06:41 AM Go to last post
  22. Assignment for a stats class: hypothesis testing and alike

    Hey everyone ! I am having a few issues with my assignment. This is question 1, I will make a second thread for question 2. Here is Question 1:...

    Started by Puma‎, 11-20-2011 07:36 PM
    • Replies: 8
    • Views: 6,744
    11-23-2011, 11:24 AM Go to last post
  23. Assignment help

    Delete thread please

    Started by hawkinswharf‎, 04-11-2013 11:37 AM
    • Replies: 0
    • Views: 945
    04-11-2013, 11:37 AM Go to last post
  24. Assignment issues

    Hi! I'm taking a Linear Regression class and I'm having some trouble with this question: Suppose {Yi} is a sequence of n independent normal...

    Started by hot4mu‎, 09-25-2008 01:44 PM
    • Replies: 1
    • Views: 2,007
    09-25-2008, 02:15 PM Go to last post
  25. Assignment with Probability

    22x22x22x22x22x22=113379904.

    Started by Eager2Learn‎, 01-31-2011 04:19 AM
    • Replies: 0
    • Views: 2,272
    01-31-2011, 04:19 AM Go to last post
  26. Assignment: Z-score question

    Assume the distribution is normal in form with a mean of 52 and standard deviation of 3. Find the scores that would correspond to the 35th, 60th and...

    Started by jrod72‎, 11-10-2010 10:54 AM
    • Replies: 4
    • Views: 6,587
    11-10-2010, 03:56 PM Go to last post
  27. Question Assistance - ANOVA

    Hello All - I'm struggling with my Psychology homework. I have to work out MS within, but I'm not sure how to do it. I know that the calculate MS...

    Started by AmandaJ‎, 08-11-2010 03:59 AM
    • Replies: 0
    • Views: 1,687
    08-11-2010, 03:59 AM Go to last post
  28. Assistance needed

    Can someone assist me in this problem? Thanks for any help with this problem. The TTEST Procedure Variable: Cholesterol Gender N Mean Std...

    Started by drkbronze‎, 11-11-2011 10:06 PM
    • Replies: 0
    • Views: 1,987
    11-11-2011, 10:06 PM Go to last post
  29. Assistance Needed: Probability of a Type II Error

    So the rest of my study group and I are absolutely stuck on this question and have been trying to figure it out for the past couple days. If anyone...

    Started by McNutter_Butter‎, 04-25-2012 02:57 PM
    • Replies: 0
    • Views: 1,268
    04-25-2012, 02:57 PM Go to last post
  30. Assistance on how to approach a problem regarding possible combinations.

    Could anyone refer me to the right direction on how to solve a problem regarding playing cards? It is a 3 Card Poker game, using 12 cards that are...

    Started by Markebri‎, 03-21-2013 12:01 PM
    • Replies: 2
    • Views: 1,295
    03-21-2013, 01:33 PM Go to last post
  31. Assistance Requested in Determining the Appropriate Statistical Analysis

    I am developing a mock research proposal. The study will be a RCT of 100 women from a health clinic. Both groups complete an initial questionnaire as...

    Started by Nicole1979‎, 06-24-2015 07:46 PM
    chi-square, fisher's exact, rct, statistical analysis
    • Replies: 0
    • Views: 686
    06-24-2015, 07:46 PM Go to last post
  32. Assistance required with transformations to normal distribution

    BACKGROUND: I have collected data on geese using 30min focal follows however my sample size is quite small (18). Independent variables are group...

    Started by Emzy‎, 07-20-2013 07:04 AM
    • Replies: 4
    • Views: 1,223
    07-23-2013, 07:28 AM Go to last post
  33. Assistance with ANOVA test

    Hi everyone, I am analyzing data from 5 winogradsky columns and am looking at how sulfate concentrations change for 5 different depth categories:...

    Started by microbe22‎, 05-03-2015 07:30 PM
    • Replies: 0
    • Views: 934
    05-03-2015, 07:30 PM Go to last post
  34. Assistance with best choice of ANOVA test

    Hi all, I was hoping to get some pointers around whether the ANOVA test I am using is appropriate, and if not how should I go about it. I want...

    Started by drewsta‎, 04-01-2015 08:40 AM
    • Replies: 4
    • Views: 1,184
    04-01-2015, 10:18 AM Go to last post
  35. Assistance with Testing Null and Alternative Hypothesis

    A survey of the wine market has shown that the preferred wine for 17% of Americans is merlot. A wine producer in California where merlot is produced...

    Started by dbm4891‎, 12-05-2011 11:14 AM
    • Replies: 5
    • Views: 3,270
    12-05-2011, 12:36 PM Go to last post
  36. Assitance Required - Survey Result Analysis

    I have recently been appointed to a CRM change project team and one of my first tasks was to carry out a survey of attendees to the demo...

    Started by modboy1980‎, 08-21-2007 06:52 AM
    • Replies: 1
    • Views: 2,467
    08-21-2007, 10:54 AM Go to last post
  37. Wink Association btw. dichotomous and ordinal variables, controlling for dichotomous var.

    Hi y'all! I've got three variables: A (3-category ordinal), B (dichotomous), C (dichotomous). Any ideas on how to find a measure of association...

    Started by witheye‎, 05-01-2012 10:55 AM
    association, correlation, dichotomous, ordinal, spss
    • Replies: 5
    • Views: 2,572
    05-03-2012, 07:30 AM Go to last post
  38. Question Association/Correlation between several Variables

    Hi everybody, I need your help with a statistical problem. My question: How can I analyze the association between several (more than 2) ordinal...

    Started by Random‎, 10-27-2007 07:11 AM
    • Replies: 1
    • Views: 2,703
    10-28-2007, 03:01 PM Go to last post
  39. associations and correlation VS Group differences

    Hello to all Talk Stats members! I would really appreciate your help on an issue that's really troubling me... In a previous post of mine I talked...

    Started by Curtains White‎, 02-18-2017 10:36 AM
    associations, correlation, group differences, spss 23, study design
    • Replies: 2
    • Views: 1,420
    02-20-2017, 12:31 AM Go to last post
  40. Assume that radon measurements are normally distributed

    with mean 4.1 and standard deviation 0.2. -Find the median of the measurement? -What is the probability the radon measurements exceed 4.5...

    Started by palpulla‎, 10-09-2016 07:17 PM
    binomial
    • Replies: 1
    • Views: 1,163
    10-09-2016, 08:00 PM Go to last post
  41. assuming a variable is/variables are normally distributed

    Ive read and also been told on here that if the sample size is > 30 I can assume the variable is normally distributed. I'm wondering if 30 isn't a...

    Started by Analytics‎, 08-19-2007 06:56 PM
    • Replies: 2
    • Views: 3,995
    08-19-2007, 10:54 PM Go to last post
  42. Assuming Equal Variances- what to do?

    Hello, On my data I have assessed whether it's parametric. The distribution is normal, however on the Levene Statistic test, it has a significance...

    Started by 03turnerS‎, 04-13-2013 05:54 PM
    • Replies: 1
    • Views: 2,370
    04-13-2013, 06:07 PM Go to last post
  43. Assuming Normal distribution

    I have some data, and i need to assume that its is distributed both with a normal and student-t distribution. How do I do that? thanks

    Started by kirpa_karo@hotmail.com‎, 07-31-2006 09:40 AM
    • Replies: 1
    • Views: 2,416
    08-02-2006, 10:29 PM Go to last post
  44. Assuming there is a normal distribution and not assuming so

    Hi, I have a problem which I don't really understand. I have 2 sets of data, which have been gotten from 2 different methods of testing something....

    Started by everlost‎, 01-30-2011 07:08 AM
    • Replies: 3
    • Views: 2,772
    02-03-2011, 01:53 AM Go to last post
  45. Assumption for inferential regression

    I was reading about regressional inference and one of the assumptions stated was: The standard deviation of the responses about the population...

    Started by Mrgarrels‎, 01-27-2017 04:11 PM
    assumption, inference, regression
    • Replies: 3
    • Views: 1,518
    01-27-2017, 07:25 PM Go to last post
  46. Assumption of normality

    Quick question: For mean comparisons such as t-tests and ANOVA, one of the assumptions is normality (normal distribution). What normality are we...

    Started by bunguman‎, 04-29-2010 12:12 AM
    • Replies: 2
    • Views: 6,548
    05-06-2010, 01:32 PM Go to last post
  47. Assumption of Normality

    Is the normality regression assumption that the sample data is normally distributed or that the residuals are? In a thesis is it worth reporting on...

    Started by ineedhelpineedhelp‎, 04-05-2014 02:07 PM
    • Replies: 1
    • Views: 1,332
    04-05-2014, 02:10 PM Go to last post
  48. Assumption of Normality in MANOVA

    Hi, When you conduct a MANOVA with several dependent variables, does the distribution of each DV have to be normal? Or, is it the distribution...

    Started by Yoshi‎, 06-01-2011 12:39 PM
    • Replies: 1
    • Views: 3,156
    06-01-2011, 01:38 PM Go to last post
  49. Assumption when using the mean and median

    Hi, When I use the mean or the median on a set of data am I making any assumptions about the distribution of the data? Can I effectively use them...

    Started by Statstastic‎, 09-22-2009 03:30 AM
    • Replies: 2
    • Views: 14,616
    09-24-2009, 05:52 AM Go to last post
  50. Assumption: Repeated Measure ANOVA

    Hi All, I have dependent (repeated) data measure at two points. Let X1= value of X at Time 1, and X2 = value X at Time 2. (1) First, I wanted...

    Started by josephpg‎, 12-29-2011 09:46 AM
    • Replies: 0
    • Views: 2,316
    12-29-2011, 09:46 AM Go to last post
  51. Assumptions ANCOVA

    hello dear forum members, when computing an ANCOVA in SPSS do I need to calculate a correlation analysis or a regression from the pretest to...

    Started by swissmiss‎, 09-30-2011 03:25 AM
    • Replies: 3
    • Views: 3,419
    09-30-2011, 10:18 AM Go to last post
  52. Assumptions for comparing means and which test to use

    I am attempting to compare the means of soil moisture measured from two adjacent soil profiles at both 10cm and 30cm. Soil measurements were measured...

    Started by cjhey‎, 05-20-2017 07:47 PM
    means, t-test, variance
    • Replies: 1
    • Views: 973
    05-21-2017, 03:04 AM Go to last post
  53. Assumptions for cubic splines

    Hi, I am familiar with the assumptions about linear regression in terms of residuals. That is Independent, Normal distributed, mean zero and...

    Started by PeterVincent‎, 04-20-2010 03:27 PM
    • Replies: 4
    • Views: 4,769
    04-23-2010, 04:15 PM Go to last post
  54. Assumptions for principal component analysis?

    Hello all. I am performing a principal component analysis. In SPSS, I found that, in my data, KMO was only around 0.3, but the p value from...

    Started by xiaoyanhuang‎, 05-17-2011 02:19 PM
    • Replies: 3
    • Views: 12,355
    05-18-2011, 02:02 AM Go to last post
  55. Assumptions in ANCOVA, and consequences of violating them

    I ran an ANOVA with 4 predictors (2 categorical, 2 continuous) and 1 covariate (continuous). Including the covariate did not significantly alter the...

    Started by MR92‎, 04-30-2014 03:59 AM
    ancova, anova, assumption, covariate, homogeneity of slopes
    • Replies: 0
    • Views: 1,160
    04-30-2014, 03:59 AM Go to last post
  56. Assumptions in cluster randomised controlled trial

    Hi there all, I have made a major assumption in my study to which I wonder has made all my results flawed!? I conducted a cluster randomised...

    Started by psychomania85‎, 06-11-2010 01:35 AM
    • Replies: 0
    • Views: 3,646
    06-11-2010, 01:35 AM Go to last post
  57. Assumptions MWU-Test

    Hi, I just donít know how to go on with my research at the moment, I havenít found answers to my questions in any forums or papers, so it would be...

    Started by fuchsmiez‎, 06-20-2013 07:12 AM
    likert scale, mann-whitney u
    • Replies: 0
    • Views: 1,626
    06-20-2013, 07:12 AM Go to last post
  58. Assumptions of a 2 proportion z-test - help!

    Hello, I recently inherited an excel workbook from someone who transferred out of my current company. Within this workbook, He was comparing...

    Started by Izzle‎, 06-20-2013 07:22 AM
    • Replies: 1
    • Views: 2,627
    06-22-2013, 03:43 AM Go to last post
  59. [SOLVED] Assumptions of an ANOVA

    1. I could google this but in my past searches I get conflicting stuff and wrong stuff. So I'll state what I think are the assumptions of ANOVA &...

    Started by trinker‎, 09-13-2012 08:23 PM
    anova, assumptions
    • Replies: 4
    • Views: 1,734
    09-14-2012, 01:02 AM Go to last post
  60. Assumptions of ANOVA

    I would like to better understand why the same variance is for each group is an assumption in the ANOVA. Can anyone explain this? Further it is...

    Started by Tony123‎, 03-28-2015 09:22 AM
    • Replies: 4
    • Views: 1,455
    03-29-2015, 06:59 AM Go to last post

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