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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,862
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,968
    07-16-2014, 11:01 AM Go to last post
  1. Data transformations - at my wits end!

    I've been transforming my participant MEANS per level of the independent variable... but I'm getting nowhere. There's still a "ceiling effect" in my...

    Started by arikel‎, 03-02-2008 04:38 PM
    • Replies: 0
    • Views: 3,212
    03-02-2008, 04:38 PM Go to last post
  2. Correlation confusion

    I have 2 continuous variables which don't significantly correlate. If I break one of the continuous variables down into a median split and run an...

    Started by arikel‎, 03-19-2008 05:44 AM
    • Replies: 4
    • Views: 2,623
    03-19-2008, 02:01 PM Go to last post
  3. Help needed quite urgently!

    Hi all. My study originally set out to measure one thing as an individual differences variable (so basically correlation/regression) and a few...

    Started by arikel‎, 03-27-2008 08:47 AM
    • Replies: 0
    • Views: 2,804
    03-27-2008, 08:47 AM Go to last post
  4. Reconstructing datasets

    is it possible to reconstruct datasets from a mean and standard deviation in someone's report? thanks!

    Started by arikel‎, 05-17-2008 07:56 AM
    • Replies: 4
    • Views: 2,803
    05-18-2008, 06:57 AM Go to last post
  5. help with streamflow data

    I have a several-step problem here and not sure how to go about it. Any advice would be appreciated. I have streamflow data (daily average...

    Started by ariklee‎, 12-14-2006 04:16 PM
    • Replies: 0
    • Views: 2,015
    12-14-2006, 04:16 PM Go to last post
  6. regression on censored data

    Hi everyone. I am trying to do statistical analysis on censored data. I have paired data: for each stream flow measurement I have a bacteria count...

    Started by ariklee‎, 03-11-2009 05:15 PM
    • Replies: 2
    • Views: 2,687
    03-11-2009, 05:50 PM Go to last post
  7. RPD Acceptance

    I am analyzing duplicate water quality sample data (2 samples collected in the same place at the same using the same procedures). I was told to use...

    Started by ariklee‎, 10-02-2009 10:39 AM
    • Replies: 1
    • Views: 7,485
    10-02-2009, 10:58 AM Go to last post
  8. How to get rid of autocorrelation for VAR model that requires high lags

    Hello, I am trying to develop a model yield to forecast yield curve 6 months in the future, loosely based Diebold Li term structure model. I am...

    Started by Arin‎, 12-18-2016 11:14 PM
    • Replies: 2
    • Views: 3,134
    12-19-2016, 11:48 AM Go to last post
  9. Decision Rule

    I am having a hard time on how to distinguish if a reject or fail to reject the Null Hypothesis I do not understand what it means i.e. i have Null =...

    Started by Aristotle Fernandez‎, 10-30-2011 05:17 PM
    • Replies: 0
    • Views: 1,963
    10-30-2011, 05:17 PM Go to last post
  10. Analysing proportional data?

    Hi! I'm a masters psychology student needing a little help with a dataset I'm analysing :shakehead Dataset: My data has a within-subjects factor...

    Started by arisu‎, 03-14-2017 12:03 PM
    • Replies: 0
    • Views: 1,124
    03-14-2017, 12:03 PM Go to last post
  11. variance and covariance need to clarify!

    Hi, There is an example in an article where the author calculates variance and covariance, but I can't understand how (I'm novice in the topic). The...

    Started by ArixII‎, 01-11-2009 12:27 PM
    • Replies: 2
    • Views: 2,814
    01-11-2009, 01:12 PM Go to last post
  12. One-Way ANOVA, Nonverbal Displays Affect Neuroendocrine Levels

    Hi, So im doing a critique review on this paper: Power Posing: Brief Nonverbal Displays Affect Neuroendocrine Levels and Risk Tolerance by Dana...

    Started by arj002‎, 06-06-2013 02:37 AM
    • Replies: 5
    • Views: 1,886
    06-07-2013, 03:27 AM Go to last post
  13. Help! Predict average Variation of commodity price for next year

    Hi All, I have data on the percentage variation of prices of commodity for the year 2011 (mentioned below) and would like to predict average price...

    Started by Arjun‎, 02-28-2012 12:36 AM
    • Replies: 8
    • Views: 2,657
    03-02-2012, 08:02 AM Go to last post
  14. How do I prove asymmetry of random counters?

    I am doing computer simulation of a certain random process. During the simultaion I have eight counters arranged symmetrically on a circle. I suspect...

    Started by Ark‎, 01-03-2014 02:15 PM
    asymmetry, difference of two means, hypotheisis testing, small sample inferences
    • Replies: 0
    • Views: 938
    01-03-2014, 02:15 PM Go to last post
  15. Hypothesis Testing - t test or ANOVA?

    Hi guys, I am doing a piece of work with an existing dataset and was looking for some advice. I have a group of subjects and controls and some...

    Started by arka‎, 11-19-2015 04:38 PM
    • Replies: 3
    • Views: 1,813
    11-20-2015, 07:36 AM Go to last post
  16. how to calculate prevalance of obesity in spss using bmi values

    i am a newbie and i dont know how to calculate prevalance of obesity in spss using bmi values

    Started by arkabbot‎, 09-05-2012 12:09 PM
    2 Pages
    1 2
    prevalance, spss
    • Replies: 16
    • Views: 21,814
    09-09-2012, 11:35 AM Go to last post
  17. GRE question re its standard deviation

    Hi guys, So if I understand correctly, GRE has the average 500 and SD of 100. So 68% of scores fall between 400-600, and 95%, 300-700, and over...

    Started by arkane‎, 08-28-2011 09:04 AM
    • Replies: 2
    • Views: 3,736
    08-28-2011, 11:49 PM Go to last post
  18. Find statistically significant variables and also where to split their range.

    Hi, I want to find a way to split a dataset so that I can see not only the importance of each attribute on the label but also at what point it needs...

    Started by arkantosno1‎, 07-06-2015 01:34 PM
    • Replies: 0
    • Views: 998
    07-06-2015, 01:34 PM Go to last post
  19. stats

    Hi can anybody help me to start with question please.

    Started by arkeed178‎, 09-07-2014 08:31 AM
    • Replies: 2
    • Views: 1,264
    09-07-2014, 09:34 PM Go to last post
  20. Help me please ... How to calculate the next element

    Hello, My boss has just asked me to come up with a formula which allows me to calculate the dow jones odds. I have all the dow jones values since...

    Started by arkguil‎, 08-04-2009 07:45 AM
    • Replies: 7
    • Views: 4,177
    08-11-2009, 08:29 AM Go to last post
  21. Two ranked ord. variables controlled by scale variable

    My aim is to study correlation between two ordinal ranked variables (Var1 and Var2) valued 0-3. In order to investigate the correlation between them...

    Started by arkiaamu‎, 02-14-2014 09:23 AM
    • Replies: 0
    • Views: 1,046
    02-14-2014, 09:23 AM Go to last post
  22. Interpreting linear correlation

    Hello, This may be a trivial (or naive) question, but I would appreciate your input. I'm working on a company text for a presentation (I didn't...

    Started by arkona‎, 10-28-2009 04:25 PM
    • Replies: 7
    • Views: 4,382
    10-30-2009, 12:46 PM Go to last post
  23. Impact of one-time events on time-series variables

    Hello, I wonder how to evaluate the impact of one-time events on time-series variables. For example: A company is selling precious metals...

    Started by arkona‎, 02-25-2011 10:28 PM
    • Replies: 2
    • Views: 6,525
    02-28-2011, 09:16 AM Go to last post
  24. Wilk's theorem and regularity condition

    EDIT: in the following " 1 + a "should be read as 1 plus a. For some reason the "plus" is not diplay on my screen. (Mod Note: I fixed that for...

    Started by Arkonis‎, 03-19-2012 11:29 AM
    • Replies: 0
    • Views: 2,540
    03-19-2012, 11:29 AM Go to last post
  25. Standard Error--Question

    I've been given a dataset that contains an estimated value of survival (Kaplan-Meier with staggered entry) by calendar dates and the associated...

    Started by arl139‎, 08-06-2014 06:08 AM
    • Replies: 0
    • Views: 1,215
    08-06-2014, 06:08 AM Go to last post
  26. Help with crosstabs (or maybe another analysis?)

    Hi. I've got a data file with 2 nominal variables, one with 3 levels (age groups) and the other with 5 levels. I've used crosstabs in SPSS to get a...

    Started by arlah_ellie‎, 10-22-2008 01:24 PM
    • Replies: 0
    • Views: 3,330
    10-22-2008, 01:24 PM Go to last post
  27. Can I extract precision and accuracy from these data? It's a calibration fit.

    Hello, I would like to know if it is possible to measure precision and accuracy from the data I am attaching in this post. My problem is that I have...

    Started by arlanscort‎, 09-03-2015 11:51 PM
    • Replies: 3
    • Views: 1,844
    09-05-2015, 07:08 AM Go to last post
  28. Unhappy Overlap between groups

    Hi everyone, I need some help on how to test overlap between two groups (men with sexual pain and men with sexual dysfunction) on their sexual...

    Started by arlp‎, 06-09-2015 01:19 PM
    • Replies: 2
    • Views: 1,293
    06-11-2015, 05:14 AM Go to last post
  29. Help with ANOVAS

    1234567891

    Started by arlucero1‎, 04-15-2013 12:36 AM
    • Replies: 1
    • Views: 1,439
    04-15-2013, 07:21 AM Go to last post
  30. Not so trivial problem with expected value

    Hello! This is a video game related question, but please, take it seriously. Assume we have a lake consisting of 528 tiles and among them are 4...

    Started by Armadillomon‎, 12-27-2011 04:53 PM
    • Replies: 4
    • Views: 2,073
    12-27-2011, 05:26 PM Go to last post
  31. Need some help :)

    Hi guys, im new to this forum, however, I am doing a dissertation paper and need to do some statistical analysis in which im very stuck. My...

    Started by arman_z207‎, 04-20-2012 09:56 AM
    • Replies: 0
    • Views: 1,357
    04-20-2012, 09:56 AM Go to last post
  32. Formulas for calculating the standard error of the mean.

    Hi, The formula for calculating standard error of mean is S ⁻x=S/√n my question is the need for doing √n and not just n

    Started by arnab0711‎, 08-10-2011 12:51 AM
    • Replies: 1
    • Views: 1,421
    08-10-2011, 03:34 AM Go to last post
  33. Lightbulb Change of moment

    Hello everyone, I have a very basic question, but you could really help me out a lot here. In the image (attachment) you can see a force F1 with...

    Started by arnout‎, 04-19-2016 02:41 PM
    • Replies: 0
    • Views: 1,095
    04-19-2016, 02:41 PM Go to last post
  34. Regression Poisson

    Hi :wave:, first of all, sorry for my english, I'm not english. My question is a quite specific of a problem. I'm doing a regression of a Poisson...

    Started by arodriguez‎, 05-03-2013 05:36 AM
    maximum likehood, poison regression, regression
    • Replies: 6
    • Views: 2,300
    05-09-2013, 04:08 AM Go to last post
  35. Which method to use when sample sizes are very different?

    Dear All, I'm trying to analyze the significance of difference between two groups. However the two groups have different sample size (one has 213...

    Started by aropro‎, 11-24-2015 08:47 AM
    • Replies: 5
    • Views: 1,582
    11-24-2015, 04:01 PM Go to last post
  36. Smile Questions on Correlation Concepts

    Hypothetically, say that I've found that the score for some physical health test (T) is strongly correlated to the time I spend working out in a gym...

    Started by Arora‎, 03-14-2006 01:22 AM
    • Replies: 2
    • Views: 2,865
    03-15-2006, 07:04 AM Go to last post
  37. Smile Principal Component Analysis

    Are the sample variances of principal components always positively biased compared to population variances? I know that the first principal component...

    Started by Arora‎, 03-15-2006 06:53 AM
    • Replies: 0
    • Views: 3,608
    03-15-2006, 06:53 AM Go to last post
  38. Question

    Hello everyone. I am working on the following problem for my stat class: Assume that when victims are asked how well their needs were met by the...

    Started by aroraaj‎, 06-05-2013 09:39 PM
    z-statistic
    • Replies: 0
    • Views: 1,471
    06-05-2013, 09:39 PM Go to last post
  39. Simple question.

    I have a question I need help with and maybe someone could assist. I'm building a system for a class that predicts student attendance. I have...

    Started by AroundRU‎, 08-14-2008 08:06 PM
    • Replies: 0
    • Views: 1,679
    08-14-2008, 08:06 PM Go to last post
  40. Which tests should I use - please help

    Hello. First-time poster here. I've been having trouble trying to figure out how to analyze some data, and I would really appreciate some help. ...

    Started by aroussin‎, 10-11-2006 01:53 PM
    • Replies: 0
    • Views: 1,916
    10-11-2006, 01:53 PM Go to last post
  41. Help with analysing a survey

    I have survey consisting of 11 items (n=270), which are multidimensional. The items differ on a 5-point Likert scale. Apart from the rationale behind...

    Started by arpix‎, 01-22-2011 07:30 PM
    • Replies: 3
    • Views: 2,241
    01-26-2011, 01:39 AM Go to last post
  42. Post Calculating p-value

    Is there a way to calculate t-test p value from average,sem and number of samples compared.

    Started by arraf‎, 04-18-2007 03:08 PM
    • Replies: 5
    • Views: 13,081
    04-21-2007, 01:44 AM Go to last post
  43. Partial autocorrelation of AR(3)

    How to compute partial autocorrelation coefficients for an AR(3) model? Zt-a1Zt-1 -a2Zt-2 - a3Zt-3=et, where et is white noise WN(0, 1). If...

    Started by arrco‎, 12-04-2009 02:48 PM
    • Replies: 0
    • Views: 3,108
    12-04-2009, 02:48 PM Go to last post
  44. Two-way ANOVA?

    Hello, I have gathered data on spruce moths. The response variable is the number of spruce moths found in the trap after two days. The first factor...

    Started by arroba761‎, 04-22-2012 09:36 PM
    • Replies: 2
    • Views: 3,308
    04-23-2012, 02:20 AM Go to last post
  45. Is a paired t-test appropriate in this situation?

    Hello, I distributed a survey comparing to different types of maps: conventional (paper) maps and a virtual map. The maps were compared using...

    Started by arroba761‎, 03-14-2013 09:13 PM
    • Replies: 2
    • Views: 1,514
    03-14-2013, 09:32 PM Go to last post
  46. Smile How to prove a non negative definite matrix has to be a variance-covariance matrix?

    I know this is a iff condition,and the reverse is easy to prove.But I am having some difficulty to prove that all non negative definite matrices are...

    Started by arsene_lady‎, 11-13-2012 07:08 AM
    multivariate analysis, probability theory, statistical analysis
    • Replies: 4
    • Views: 1,667
    11-14-2012, 02:09 PM Go to last post
  47. Is the transpose of a g inverse the g inverse of transpose of the matrix?

    While working with linear models,I came across the situation where the proof of some results might be easier if we apply that transpose of g inverse...

    Started by arsene_lady‎, 12-02-2012 01:55 AM
    linear models, r programming and usage, statistical model
    • Replies: 2
    • Views: 1,862
    12-02-2012, 09:00 AM Go to last post
  48. How do I compare variance and covariance accross groups (MANOVA)?

    Hello everyone, As you'll guess, I'm pretty clueless in statistics, but I do try my best... So I'm doing a MANOVA, my sample sizes are all over the...

    Started by art‎, 05-01-2012 11:26 AM
    manova, unequal sample sizes, variance-covariance
    • Replies: 0
    • Views: 1,184
    05-01-2012, 11:26 AM Go to last post
  49. Conflicting Deducement - Which One Is Statistically Logic ?

    (I have posted a similar thread here; the reason I'm posting the same thread here is because this section gets more viewers and so I hope somebody...

    Started by art.sibu‎, 03-04-2009 09:02 AM
    • Replies: 0
    • Views: 3,169
    03-04-2009, 09:02 AM Go to last post
  50. Quick Question about McNamre, Mann-Whitney U, and Chi-square, Cochran Q test

    Hello, I am doing a study where I have to look at effect of demographic parameters on outcome in patients. For example to see if race has a...

    Started by artaxerxes‎, 02-05-2012 10:47 AM
    • Replies: 1
    • Views: 1,708
    02-05-2012, 01:54 PM Go to last post
  51. World Series stat question

    On StatTrek http://stattrek.com/Lesson2/Binomial.aspx?Tutorial=Stat there is an explaination of probability of World Series ending in exactly 5...

    Started by ArtD‎, 08-01-2010 06:37 AM
    • Replies: 0
    • Views: 2,201
    08-01-2010, 06:37 AM Go to last post
  52. Best Way to Present Non-Normally Distributed Data

    Hi, I wondered if anyone could give me advice on the best way to present two sets of continuous (not normally distributed) data. Would median ...

    Started by arthur‎, 04-15-2014 02:23 PM
    • Replies: 3
    • Views: 2,704
    04-16-2014, 02:49 AM Go to last post
  53. Gaussian Density

    Hi everyone, I'm making some practice exam questions and hope someone can help me with the following problem: The inverse Gaussian density is...

    Started by Artreides‎, 02-24-2015 10:47 AM
    • Replies: 6
    • Views: 1,065
    02-25-2015, 10:05 AM Go to last post
  54. Estimated mean response

    I would like to know how to write down the estimate mean response when doing a multiple regression. I know what the standard mean response is, see...

    Started by Artreides‎, 03-03-2015 05:26 AM
    • Replies: 3
    • Views: 1,632
    03-09-2015, 03:52 AM Go to last post
  55. Choosing between parametric, non-parametric, semi parametric

    For an assignment I have to fit the best model to my data. The first step is to decide to which family it belongs to. My y variable is binomial...

    Started by Artreides‎, 05-17-2015 04:01 AM
    • Replies: 2
    • Views: 1,208
    05-17-2015, 02:02 PM Go to last post
  56. Confidence Interval and P-value

    I am trying to get my head around CI's and p-values and I am hoping this example will help. Lets say there were two seperate lots of research done...

    Started by artsta‎, 04-10-2011 03:08 AM
    • Replies: 3
    • Views: 2,979
    04-10-2011, 10:07 AM Go to last post
  57. Three parameter Weibull confidence intervals

    I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

    Started by arturo_20‎, 07-03-2015 09:40 AM
    • Replies: 0
    • Views: 928
    07-03-2015, 09:40 AM Go to last post
  58. GUYS!! Last exercise for GRADUATION!!! EMERGENCY!!!

    Hey guys! I am a Arxelaos, I am about to graduate from BA and have only one course to go: STATISTICS!!! So, m gonna need your help with one exercise!...

    Started by Arxelaos‎, 06-10-2014 12:18 PM
    • Replies: 12
    • Views: 2,454
    06-11-2014, 02:21 PM Go to last post
  59. What correlation is present on the scatter-plot?

    The options are: 1)+0.3 2)+0.8 3) Could be both, cannot tell just by visualizing the plot.

    Started by Aryon‎, 02-05-2016 12:14 PM
    • Replies: 10
    • Views: 3,120
    02-07-2016, 05:46 AM Go to last post
  60. Question Designing an experiment

    Could you plz answer this question? A firm is attempting to evaluate the quality of its sales staff and is trying to find an examination, or...

    Started by arzedaily4121‎, 10-26-2016 08:28 PM
    design experiment, question
    • Replies: 1
    • Views: 923
    10-27-2016, 12:19 AM Go to last post

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