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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: 197,257
    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: 67,020
    09-30-2005, 09:44 AM Go to last post
  1. Age distribution between groups???

    I am hoping to test whether there is a statistical difference between two groups of participants between the ages of 2-7. I know by looking at...

    Started by stacyrobinson‎, 11-01-2006 05:30 PM
    • Replies: 1
    • Views: 2,512
    11-01-2006, 07:50 PM Go to last post
  2. Age groups

    How can I make age as an ordinal (categorical) variable? I work on the sample composed of Youth. 17-23, 24-30, More than 30 years old. What can I...

    Started by Rachi‎, 06-01-2014 10:47 AM
    • Replies: 5
    • Views: 1,837
    06-01-2014, 12:22 PM Go to last post
  3. age is scale data in spss BUT what if the ages are grouped??? is it then ordinal?

    Hi, I know that age is a scale measurement in spss but if i have ages that are groupef for example; 1= <20 2=21-30 3=31-40 4= > 40 is...

    Started by mimestra‎, 03-27-2011 03:07 AM
    • Replies: 1
    • Views: 29,079
    03-27-2011, 08:34 AM Go to last post
  4. Age Matching

    Hi i have a question about "age matching". So I am doing a study that evaluates a control's and diabetic's retinal function (measured in micro...

    Started by wilson‎, 10-30-2013 02:57 PM
    • Replies: 0
    • Views: 1,153
    10-30-2013, 02:57 PM Go to last post
  5. age-heaping and running medians

    hello. i have a question about age heaping and running medians. i attached a excel sheet where i calculated running medians of 3,5,7 for ...

    Started by iIsee Deadpeople‎, 10-06-2012 09:47 PM
    • Replies: 0
    • Views: 1,446
    10-06-2012, 09:47 PM Go to last post
  6. Age-Period-Cohort Model

    I am looking for feedback on the feasability of a model I am specifying. I have four cohorts of longitudinal data. Each cohort contains ten years...

    Started by Lazar‎, 05-07-2015 09:59 PM
    • Replies: 0
    • Views: 1,111
    05-07-2015, 09:59 PM Go to last post
  7. Aggregate Proxies in Micro Level Research

    Can anyone point me to a straightforward discussion of the potential drawbacks of using aggregate proxies (say census tract median income instead of...

    Started by gatormka‎, 03-05-2008 01:21 PM
    • Replies: 0
    • Views: 2,234
    03-05-2008, 01:21 PM Go to last post
  8. Aggregated data analysis

    Hi, I would like to know how it would be possible to make a t-test with aggregated data on SPSS or R. My dataset looks like this: ...

    Started by Sarou‎, 12-17-2015 12:23 PM
    • Replies: 0
    • Views: 1,183
    12-17-2015, 12:23 PM Go to last post
  9. Aggregating across data sets

    First, I just want to say that I am as green is it gets regarding statistics, but am hoping someone here can help me do a sanity check. Right now,...

    Started by diz420‎, 03-08-2013 02:53 PM
    • Replies: 0
    • Views: 1,003
    03-08-2013, 02:53 PM Go to last post
  10. Aggregating standard deviations - I'm stuck!

    Can anyone help with this stats problem? I'm working on a problem where I'm aggregating centers of gravity and the inertia tensor for multiple...

    Started by Czar‎, 06-03-2008 12:41 PM
    • Replies: 2
    • Views: 7,976
    06-03-2008, 08:14 PM Go to last post
  11. aggregation over groups vs. rounds

    I have an experimental design where I have 10 groups and within each group there are 10 people. Each subject answers 12 questions five times. I...

    Started by eph‎, 03-13-2012 08:50 AM
    aggregation
    • Replies: 0
    • Views: 1,522
    03-13-2012, 08:50 AM Go to last post
  12. Agnes

    Hi, I'm just starting with clustering. I am trying Agnes for now. I have a table of N observations (individuals?) and M variables for each...

    Started by darfunkel‎, 11-23-2010 07:46 AM
    • Replies: 0
    • Views: 1,872
    11-23-2010, 07:46 AM Go to last post
  13. AIC GLM and GLMM

    I'm running a GLMM with a number of fixed and random effects with a binary dependent. However, I want to look at the main effect of one of the fixed...

    Started by monkeyspearfish‎, 08-06-2015 12:31 PM
    • Replies: 4
    • Views: 1,598
    08-06-2015, 02:24 PM Go to last post
  14. AIC scores for a two (or three) part model

    Data is # of individuals through time. I fit logistic and exponential growth curves to the data. An event (population bottleneck) takes # to nearly...

    Started by Sawatch22‎, 07-03-2017 11:30 AM
    • Replies: 2
    • Views: 700
    07-03-2017, 09:59 PM Go to last post
  15. AIC Weights

    Bit hard to explain what I want to say, but basically, one of my models seems to explain my dependent variable 'disproportionately'. The reason...

    Started by monkeyspearfish‎, 08-11-2015 01:08 PM
    • Replies: 3
    • Views: 1,442
    08-11-2015, 03:16 PM Go to last post
  16. Airline Statistics

    I am trying to determine if there is a statistically significance (p=.05) in passenger enplanements between 2 different airlines at the same airport...

    Started by powderhound0522‎, 07-09-2011 06:37 PM
    • Replies: 0
    • Views: 1,987
    07-09-2011, 06:37 PM Go to last post
  17. Algebraid formulas in statistics

    Hi, does anyone know how I can use an algebraic formula in spss (or VBA or Excel) to convert billing cycle data to calendar month use. here is an...

    Started by heather_s‎, 04-08-2010 12:30 AM
    • Replies: 0
    • Views: 1,678
    04-08-2010, 12:30 AM Go to last post
  18. Algorithm for Ranking in Game

    Disregard///

    Started by latimer‎, 11-07-2010 08:44 AM
    • Replies: 0
    • Views: 2,430
    11-07-2010, 08:44 AM Go to last post
  19. Unhappy algorithm for solving a double integral with monte carlo method

    Hi, everyone Is been a while since I finished school and my nephew needs me. He has to calculate an double integral ∫0∞∫0∞e(-x-y-xy)dxdy ...

    Started by flori_vucu‎, 05-02-2012 02:41 AM
    • Replies: 0
    • Views: 1,655
    05-02-2012, 02:41 AM Go to last post
  20. algorithms for generating books

    Hello to all! There are sites that have software that can write entire books by extracting information from the internet. entering the keywords for...

    Started by iacoposk8‎, 10-11-2013 07:41 AM
    • Replies: 2
    • Views: 1,421
    10-21-2013, 09:57 AM Go to last post
  21. All assumptions violated?

    Hi everyone, I'm working with a student on her Masters and we have come across an interesting problem that is beyond me. We're looking at the...

    Started by jman057‎, 10-22-2013 10:46 PM
    • Replies: 1
    • Views: 1,667
    10-23-2013, 02:33 AM Go to last post
  22. Smile All basic formulas

    Dear All I have been reading lots of materials here and there, but I was wondering whether anybody had either a document or a link for all basic...

    Started by SylviaS‎, 11-02-2008 06:55 AM
    • Replies: 2
    • Views: 6,588
    01-22-2009, 01:11 AM Go to last post
  23. All you need is mu

    Last time this forum gave me some good help, spotting a mistake that i hadn't noticed. Hopefully this time you can have a look at this and see if...

    Started by Joeseph‎, 02-04-2013 08:59 AM
    • Replies: 1
    • Views: 1,117
    02-04-2013, 09:17 AM Go to last post
  24. Allocating Items to a Limited Number of Slots

    Hi, Let's say that I have a small retail shop that has slots available for only 5 types of products. However, I also have a warehouse located...

    Started by sumantra‎, 01-06-2007 08:43 AM
    • Replies: 0
    • Views: 3,023
    01-06-2007, 08:43 AM Go to last post
  25. Post Almost done with assignment but . . .

    Need some help on the final steps. Multipart assignment and I am down to last three steps but am on last two. Parts are 7. Calculate...

    Started by vonbaxter‎, 04-19-2007 04:32 PM
    • Replies: 1
    • Views: 2,640
    04-23-2007, 01:17 PM Go to last post
  26. almost sure convergence vs. convergence in probability, practical difference?

    Hello I know the theoretical difference between these two types of convergence. Are the difference important in practice? If you are going to...

    Started by Tarly‎, 07-13-2014 02:22 PM
    • Replies: 2
    • Views: 1,620
    07-13-2014, 04:43 PM Go to last post
  27. Alpha & Beta errors!

    A machine produces 50 lb bags of chips. In this particular process, it is important that the chip content does not go below 49.9 lbs. In fact, when...

    Started by canon14‎, 11-04-2009 10:25 AM
    • Replies: 3
    • Views: 4,520
    11-06-2009, 10:20 AM Go to last post
  28. alpha and p-value hypothesis testing?

    What does it mean when alpha > p-value? I know that when alpha> p-value, you reject the null, and that when alpha < p-value you do not reject the...

    Started by augustusachilles‎, 05-30-2010 01:14 PM
    • Replies: 1
    • Views: 4,294
    05-30-2010, 09:16 PM Go to last post
  29. Exclamation Alpha error and Bonferroni correction?

    Hi! I'm writing my masterthesis and I would be happy to get an advise about bonferroni correction. I'm analysing if adverse childhood experiences...

    Started by Rebecca87‎, 03-14-2011 08:53 AM
    • Replies: 1
    • Views: 3,392
    03-14-2011, 09:54 AM Go to last post
  30. alpha level

    Here is a question i am working on and the answer seems to be a little too simple: If (regardless of the data) I wanted to reject Ho always, what...

    Started by statgirl1000‎, 03-14-2009 02:04 PM
    • Replies: 2
    • Views: 3,103
    03-22-2009, 02:18 AM Go to last post
  31. alpha level question

    Hi, could someone please help with the below question? Why does setting the alpha at a different level change the probability of a type 1 and type...

    Started by rookie‎, 04-13-2012 06:53 PM
    • Replies: 1
    • Views: 1,661
    04-14-2012, 01:21 AM Go to last post
  32. Alpha size and power?

    In statistical hypothesis testing, does a bigger size alpha mean a more powerful test? Is an alpha level of .05 more powerful than an alpha level...

    Started by augustusachilles‎, 05-26-2010 08:14 PM
    • Replies: 1
    • Views: 6,349
    05-27-2010, 11:16 AM Go to last post
  33. alpha? p-value?

    Hi everyone, I am very confused with p-value and alpha. I do appreciate your help. Please take a look at the following questions and answers: ...

    Started by jessicaf‎, 05-08-2006 10:54 PM
    • Replies: 7
    • Views: 77,998
    01-03-2012, 09:09 AM Go to last post
  34. Alphabets

    So I just took an exam with the following question: Using all 26 letters in the English alphabet, you completely random combinations of 7 letters....

    Started by Shaq's Left Nut‎, 10-05-2012 12:14 PM
    • Replies: 5
    • Views: 1,284
    10-06-2012, 11:23 AM Go to last post
  35. Alter sample size during experiment based on results, influence on P(Type I error).

    I hope anyone can help me to understand why you cannot simply increase the sample size during an experiment based on intermediate results, because...

    Started by maq‎, 05-14-2014 04:50 AM
    • Replies: 1
    • Views: 896
    05-14-2014, 07:23 AM Go to last post
  36. Alternate route problem

    Hi all, I am having difficulty in a question which says a man can choose two routes since on Xmas his preferred route is busy and he wants to get...

    Started by SadieKhan‎, 01-29-2011 02:59 PM
    • Replies: 6
    • Views: 2,810
    01-29-2011, 05:23 PM Go to last post
  37. alternate t-test

    Hello Folks! I'm working on a problem where I test whether the difference between 2 means is zero using this statistic: tobs = (x − y)/q(sx^2...

    Started by oj2222‎, 09-30-2010 04:13 PM
    • Replies: 4
    • Views: 2,708
    10-01-2010, 12:22 AM Go to last post
  38. Alternative Durbin-Watson Test

    Hey, For some reason, I just cannot get my head around the concept of the alternative Durbin-Watson tests that I am trying to calculate. I'm...

    Started by DRK321‎, 05-08-2008 10:29 PM
    • Replies: 0
    • Views: 3,910
    05-08-2008, 10:29 PM Go to last post
  39. alternative for chi square

    what is the alternative for (2x2 table) chi square if more than one cell has an expected value of less than 5, given that the sample size is more...

    Started by nurul‎, 09-15-2010 08:52 AM
    • Replies: 4
    • Views: 7,766
    09-15-2010, 08:30 PM Go to last post
  40. Alternative hypotheses, sample size

    Ichose to study this problem, how would I incooperate the rest with this? Heights measured for a random sample of 17 plants grown while being...

    Started by ladymac201‎, 04-27-2008 12:34 PM
    • Replies: 1
    • Views: 3,997
    04-27-2008, 12:36 PM Go to last post
  41. Alternative Hypothesis Help

    6) A mirror maker claims his best product has an average lifespan of exactly 20 years. A skeptical quality control specialist asks for evidence...

    Started by salmanwashere‎, 04-02-2009 09:54 PM
    • Replies: 2
    • Views: 2,774
    04-03-2009, 01:22 PM Go to last post
  42. Alternative hypothesis.

    Find the Alternative Hypothesis the formula for each test statistic, if one exists : H0:μ=μ0 n=20 and s =45 pop normal distribution H0:μ≤μ0 n...

    Started by JorgeWFD‎, 05-15-2011 04:46 PM
    • Replies: 0
    • Views: 2,014
    05-15-2011, 04:46 PM Go to last post
  43. Alternative nonparametric test for chi-square test for independence

    Hello, suppose we have a table like this: and we want to know if wining or loosing depends on sex (male or female) apart from chi-square test...

    Started by Fred_a‎, 03-21-2013 02:40 PM
    independence, non parametric
    • Replies: 0
    • Views: 1,258
    03-21-2013, 02:40 PM Go to last post
  44. Alternative theory?

    Can you kindly take a look at this problem and check my answers for a, b, and c? Any insight/suggestions are appreciated. Thanks PROBLEM: 133...

    Started by CandyCane11205‎, 03-23-2009 04:10 PM
    • Replies: 0
    • Views: 2,113
    03-23-2009, 04:10 PM Go to last post
  45. alternative to ANOVA for count data? (old post re-worded/simplified)

    On the advice of a couple of members, I am re-posting my question more concisely so hopefully it is easier to follow.. I have categorical count...

    Started by Sammy‎, 11-16-2011 04:55 PM
    • Replies: 2
    • Views: 2,030
    11-16-2011, 06:08 PM Go to last post
  46. Alternative to Chi2

    Hello, I am comparing proportions but the 2 samples have very different sizes with one of them being really big. Example: 1/92 vs 16/58232 which...

    Started by mousme‎, 12-06-2011 04:31 AM
    • Replies: 0
    • Views: 2,771
    12-06-2011, 04:31 AM Go to last post
  47. Alternative to factor analysis when there are less than 100 participants?

    Hi all It's been quite some time since I've posted on this site, but have come up against a new problem in my analysis that is baffling me...

    Started by gemma7‎, 06-15-2009 06:40 AM
    • Replies: 1
    • Views: 6,356
    06-15-2009, 06:59 AM Go to last post
  48. Alternative to matrix algebra?

    I have a table of data that has 11 rows and 33 columns. The independent variables of each case contribute to determining a single dependent variable...

    Started by WhiteCog‎, 03-28-2009 04:24 PM
    • Replies: 0
    • Views: 2,189
    03-28-2009, 04:24 PM Go to last post
  49. Alternative to t-test in very large dataset

    I am having a big problem with a very large dataset (10000+) of dispositional and behavioral measures in health professionals: every single t-test...

    Started by bergier‎, 09-14-2011 05:52 PM
    • Replies: 6
    • Views: 3,058
    09-15-2011, 08:19 AM Go to last post
  50. alternative to univariate

    Hi! I'm doing an empirical research on metacognition and false memories. I am not certain which test to use to find out a possible interaction. I...

    Started by polona‎, 02-18-2009 06:00 PM
    • Replies: 1
    • Views: 2,782
    02-19-2009, 04:32 PM Go to last post
  51. Alternatives to two-way tables

    Are there any alternatives to two-way tables that show a higher level of understanding? If you know some, could you please detail and explain how...

    Started by Chelsea20677‎, 01-22-2013 03:09 PM
    • Replies: 1
    • Views: 1,048
    01-22-2013, 03:21 PM Go to last post
  52. Always able to assume normality if sample size >= 31

    I know at a sample size of 31 or larger, and from a random sample selection, you are able to assume normality. Is this in general always true? If...

    Started by cmf0106‎, 09-21-2009 11:51 AM
    • Replies: 6
    • Views: 19,739
    09-28-2009, 03:21 PM Go to last post
  53. Am I causing statistical violations?

    Hi folks I am trying to analyze where the significant differences are between 2 sets of time series. Group 1 (Expert) has 29 trials normalised to...

    Started by DrMark‎, 07-28-2015 05:05 AM
    • Replies: 0
    • Views: 1,022
    07-28-2015, 05:05 AM Go to last post
  54. Am I choosing the right test?

    My daughter is doing a science fair project testing the efficacy of insect repellants. She has 3 trials each for 3 repellants and 1 control. In...

    Started by ironrabbit‎, 11-11-2016 07:02 PM
    • Replies: 1
    • Views: 1,558
    11-11-2016, 11:03 PM Go to last post
  55. Am i correct in thinking? (please help!)

    Hi all, great site and a valuable resource. i am wondering if you guys could please help me out in my thinking out my research question. Ive made...

    Started by blue2‎, 10-19-2010 11:35 AM
    • Replies: 0
    • Views: 2,104
    10-19-2010, 11:35 AM Go to last post
  56. Question Am I correct to use a t-test?

    I'm trying to plan a research paper, but I have no experience with statistics and would appreciate advice as to the kind of test i should be using....

    Started by douglaskiddie‎, 12-05-2012 03:15 PM
    • Replies: 1
    • Views: 1,666
    12-05-2012, 03:53 PM Go to last post
  57. Am I correctly generating my p-values?

    Hi, I am a doctor in the UK, and did a (very) little bit of undergraduate statistics >10 years ago. I am preparing an abstract for submission for...

    Started by richard.fisher‎, 04-15-2014 02:41 AM
    • Replies: 4
    • Views: 1,588
    04-16-2014, 01:31 AM Go to last post
  58. Am I doing this ANOVA right?

    Hi, although I am doing graduate work I am totally new to stats and its doing my head in! Please try to answer in plain english! I am planning...

    Started by xanderd‎, 06-29-2006 07:53 AM
    • Replies: 1
    • Views: 1,723
    06-29-2006, 05:23 PM Go to last post
  59. Am I heading in the right direction?

    Hi all, first post here, but I'm not trying to sponge off your vast knowledge! Just wanted to ask if I'm going about my analysis in the right...

    Started by mattyjl9‎, 04-09-2008 05:52 AM
    • Replies: 0
    • Views: 1,857
    04-09-2008, 05:52 AM Go to last post
  60. Am I interpreting this correctly?

    I have a continuous DV and 2 categorical + 1 continuous IVs. In spss I did a univariate analysis and found a main effect of one of the categorical...

    Started by vl11‎, 09-30-2016 07:21 PM
    glm, spss
    • Replies: 0
    • Views: 1,102
    09-30-2016, 07:21 PM Go to last post

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