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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: 66,620
    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: 196,561
    07-16-2014, 11:01 AM Go to last post
  1. History & Development of Statistics....

    Hi, I have been given the task to write on the Topic: History & Development of Statistics. This task was given to me by my HOD(Head of Department...

    Started by Abhishek‎, 07-05-2013 08:39 AM
    • Replies: 10
    • Views: 2,125
    07-11-2013, 09:16 AM Go to last post
  2. Post Maximization problem!

    Hello, I have a dataset of 5-dimensional vector X={x_i: i=1,2,3,4,5} and their corresponding y where y is a real-valued number. How can I derive...

    Started by abhishek2301‎, 05-19-2012 07:24 PM
    • Replies: 6
    • Views: 2,131
    05-24-2012, 10:32 AM Go to last post
  3. kurtosis skewness and Jarque Bera interpretation

    I am getting a value of 27.202 of kurtosis, Jarque bera of 861.4684 with probability 0.000000 and skewness of 5.078,,,,,,,,,, what to interpret are...

    Started by abi khan‎, 12-06-2011 05:07 AM
    • Replies: 2
    • Views: 8,780
    12-06-2011, 08:58 AM Go to last post
  4. non-central chi-square distribution

    Dear All I do not have enough background in statistics. Can any one please tell me how to finde probabality for noncentrally chi-sqaure random...

    Started by Abid‎, 11-14-2007 07:32 AM
    • Replies: 3
    • Views: 8,029
    11-15-2007, 09:34 AM Go to last post
  5. Question independence of observations and 'best' observation

    Hello forum. This is my first post. I'm pleased to find somewhere I can ask questions about, and hopefully, help others figure out how to do good...

    Started by abnormal distribution‎, 06-04-2009 10:00 AM
    • Replies: 1
    • Views: 3,086
    06-07-2009, 06:35 PM Go to last post
  6. Statistics

    I have some homework for my stats class. It's fairly simple, but I just can't seem to figure out which test is appropriate for the situation. Can...

    Started by abnormali7y‎, 07-06-2010 04:17 PM
    • Replies: 3
    • Views: 2,650
    07-07-2010, 03:49 PM Go to last post
  7. How to compare changes in different groups

    I have two separate datasets, each with two independent (unpaired) measurements. So there are four measurements in total. Within each dataset, I...

    Started by abroz‎, 07-27-2012 01:42 PM
    • Replies: 2
    • Views: 1,774
    07-30-2012, 04:05 PM Go to last post
  8. Likelihood Ratio test

    I have a pdf where I would like to test for the following hypothesis: H0: θ1=θ1,0; Ha: θ1>θ1,0, and f(x) =(1/θ1) exp((-x-θ2)/θ1), if x>θ2, and 0...

    Started by absama‎, 04-26-2014 07:18 PM
    hypothesis testing, likelihood ratio test
    • Replies: 8
    • Views: 1,855
    04-27-2014, 10:51 AM Go to last post
  9. T-Test: Accounting for country level & difference of two time points

    Hey everyone, another student and I are currently working on a paper in which we face a problem that we just cannot solve. Probably it is super easy...

    Started by AbsoluteBeginner‎, 02-25-2016 11:08 AM
    • Replies: 0
    • Views: 1,795
    02-25-2016, 11:08 AM Go to last post
  10. Directed acyclic graph

    Hello I'm a beginner at epidemiology and have an assignment where I'm trying to create a DAG using dagitty to determine what to adjust for when...

    Started by abstract1977‎, 05-11-2015 08:54 AM
    confounding, dag, epidemiology
    • Replies: 1
    • Views: 1,046
    05-11-2015, 04:27 PM Go to last post
  11. Distribution, data aggregation/simplification

    Hello, I'm working with fisheries data and I have the quantity in kg of each species caught by boat, by day. There is one species that is dominant...

    Started by abs_fab‎, 12-05-2008 07:40 AM
    • Replies: 0
    • Views: 2,284
    12-05-2008, 07:40 AM Go to last post
  12. Likert scale help

    Hi guys, I'd really appreciate any help, I'm useless with statistics and I'm very confused! Basically, I have gathered data using a 5-point Likert...

    Started by aburke‎, 01-22-2010 09:01 AM
    • Replies: 0
    • Views: 2,153
    01-22-2010, 09:01 AM Go to last post
  13. I Need Help..

    Dear, members of Talk Stats.. I need to know how to solve these 5 questions by STATISTICA PROGRAM. I want the STEPs for each question. Questions...

    Started by Abu_Nayef_10‎, 10-05-2013 12:33 PM
    • Replies: 1
    • Views: 1,652
    10-05-2013, 11:08 PM Go to last post
  14. Need a stats test for Temperature test.

    Hello, I have an average temperature value for a day in January (-14) and I want to see if it is different then the average value for the entire...

    Started by acaky‎, 03-21-2013 05:14 PM
    • Replies: 1
    • Views: 1,614
    03-22-2013, 06:46 AM Go to last post
  15. Standard Deviation

    Ok...so i need to find the values above and below the mean using standard deviation. I have the mean and the standard deiviation, but the mean...

    Started by acarnle1‎, 09-09-2008 08:51 AM
    • Replies: 2
    • Views: 1,999
    09-09-2008, 12:32 PM Go to last post
  16. least squares predictions

    I need to figure out what percent will reduce the prediction error of a least squares equation with a set of data....My prof said to use the r^2...

    Started by acarnle1‎, 10-09-2008 08:36 PM
    • Replies: 1
    • Views: 2,163
    10-09-2008, 10:31 PM Go to last post
  17. Question Urgent indicator semivariogram problem

    Hello. I'm trying to create an spatial indicator semivariogram (variables transformed to 0 and 1), but i got the same graph for both. i'm using...

    Started by acbel65‎, 05-29-2011 01:08 AM
    indicator semivariogram, semivariogram, spatial analysis
    • Replies: 0
    • Views: 3,710
    05-29-2011, 01:08 AM Go to last post
  18. The appropriate regression analysis

    The study is about the factors (Independent Variables) affecting a choice between two alternatives (Dependent Variable). The study includes a...

    Started by Acc1987‎, 10-20-2016 06:31 AM
    • Replies: 6
    • Views: 2,086
    10-27-2016, 07:22 PM Go to last post
  19. From variance to 95% confidence interval: Is this done right?

    Hello I have a forest inventory project where I am trying to estimate the total forest wood volume (in cubic feet) with a 95% confidence...

    Started by Acer Lambada‎, 09-12-2017 03:29 PM
    • Replies: 4
    • Views: 439
    09-13-2017, 05:39 PM Go to last post
  20. Test whether the SD of multiple normal distributions differs between two genes

    Hi, I am comparing data on gene expression between two different genes that have been tagged with GFP. Gene expression is measured using flow...

    Started by acgerstein‎, 12-14-2012 03:13 PM
    normal distribution, standard deviation
    • Replies: 0
    • Views: 1,145
    12-14-2012, 03:13 PM Go to last post
  21. Question on conditional expectation

    Hello, I would like to know, whether the following is true: E = f(x,y) Unfortunately I was unable to find an answer on the internet...

    Started by achacy‎, 02-06-2014 04:55 AM
    • Replies: 0
    • Views: 1,050
    02-06-2014, 04:55 AM Go to last post
  22. Sign of covariance

    Hello everyone, I would like to know, if the following relationship holds in general: \left. \begin{aligned} cov(X,Y)& < 0 \\ % use \quad...

    Started by achacy‎, 05-08-2014 10:45 AM
    • Replies: 1
    • Views: 1,301
    05-08-2014, 11:27 AM Go to last post
  23. 2x2 Anova, im struggling to report the assumptions

    Hello, I've ran a 2x2 anova and am trying to report the assumptions but would like to make sure ive done it correct, statistics is my weak point!...

    Started by achal‎, 02-22-2016 08:50 AM
    anova, assumptions, spss
    • Replies: 3
    • Views: 830
    02-22-2016, 04:45 PM Go to last post
  24. Regression Equation question

    Can you tell me, if you have a regression equation with two partial regression coefficients (slopes), can you guestimate the p-values for each...

    Started by achancemtg‎, 12-13-2006 03:15 PM
    • Replies: 1
    • Views: 2,630
    12-15-2006, 06:33 PM Go to last post
  25. Post Inventory Control

    I have this question on Inventory Stock and I need a solution to it. Guys, I need help. charls. Question: Mr Steve is a merchant which deals on...

    Started by acharls‎, 07-24-2008 04:03 AM
    • Replies: 0
    • Views: 2,238
    07-24-2008, 04:03 AM Go to last post
  26. predicting discrete variable (age) from continuous data and transformations

    Hi, i have data on age (years) and a continuous variable (weight for example). I want o predict the age using a linear regression. However, i...

    Started by achemua‎, 01-25-2012 06:42 AM
    age, discrete, regression, transformation
    • Replies: 4
    • Views: 3,986
    01-25-2012, 03:48 PM Go to last post
  27. help with contour plots

    I am producing contour plots with curvature, basically like hills that look like asymetric lobes when looked at from the top. I was wondering if...

    Started by acho‎, 01-21-2008 04:40 PM
    • Replies: 0
    • Views: 1,765
    01-21-2008, 04:40 PM Go to last post
  28. Normal Distributions

    ok, I have this one problem that I cannot figure out for the life of me. It's probably really simple, but I really just can't figure it out. Any...

    Started by AcidicBassist‎, 04-03-2006 11:35 PM
    • Replies: 0
    • Views: 2,822
    04-03-2006, 11:35 PM Go to last post
  29. Unequal (small) sample size?

    Hello I am very new to Statistics and I would much appreciate if someone could help me answering this question. I have carried out a survey which...

    Started by acifter‎, 04-18-2011 07:37 AM
    • Replies: 0
    • Views: 4,284
    04-18-2011, 07:37 AM Go to last post
  30. Making Seasonal Data form Monthly

    I've got a climate data set spanning a number of years in monthly intervals, but I'm only interested in what happens in winter months - October...

    Started by Aclark‎, 03-24-2013 12:30 PM
    climate, monthly, r code, seasonal, subset
    • Replies: 0
    • Views: 1,018
    03-24-2013, 12:30 PM Go to last post
  31. How to compare a change in proportion over time across two groups?

    I have two groups of subjects, A & B, which differ in terms of whether they have pulmonary disease or not ("A" have pulmonary disease, "B" do not) ...

    Started by aclough‎, 06-21-2009 04:07 AM
    • Replies: 0
    • Views: 6,675
    06-21-2009, 04:07 AM Go to last post
  32. Which standard deviation to use?

    Hi, I'm new here on the forum. I'm from the Netherlands and working in the field of acoustics. I have a question, which might be quite simple....

    Started by acoustics‎, 11-15-2007 08:59 AM
    • Replies: 1
    • Views: 2,043
    11-15-2007, 09:25 AM Go to last post
  33. help! Prioritizing data in lists

    It been awhile since I've done any statistics and I am looking for a little help. I am trying to analyze some data from a survey. A group of about...

    Started by actioncam1‎, 02-13-2010 04:49 PM
    • Replies: 1
    • Views: 2,070
    02-14-2010, 12:58 PM Go to last post
  34. How do I find standard deviation without a sample size ?

    I have been working on a problem with the help of a friend who is pretty knowledgeable on the subject. I don't think this is possible to find a...

    Started by Actress80‎, 02-20-2015 02:33 PM
    • Replies: 2
    • Views: 4,114
    02-21-2015, 10:44 AM Go to last post
  35. Effect Size and Significance

    Can effect size be used to predict significance or vice versa? I was asked what size effect would be needed to reach significance? Can this be done?...

    Started by Acutegrl‎, 08-15-2007 12:11 AM
    • Replies: 1
    • Views: 2,421
    08-15-2007, 11:00 AM Go to last post
  36. Red face Is Chi Square Even The Right Test?!?

    I recently collected data for a study that mesaured participants comprehension ratings of collision avoidance warnings. Each warning was presented...

    Started by Acutegrl‎, 09-22-2007 01:43 PM
    • Replies: 0
    • Views: 2,617
    09-22-2007, 01:43 PM Go to last post
  37. Interaction terms in survival analysis - equivalent to glm contrasts?

    I am wondering if there is a way to interpret an interaction term from the coefficients rather than just looking at the survival curves? The...

    Started by ad26‎, 02-21-2014 02:10 PM
    • Replies: 0
    • Views: 1,631
    02-21-2014, 02:10 PM Go to last post
  38. Sample size

    Hello i am hoping someone can help me with this question below Will my sample size increase, stay same or decrese, if i go from comparing...

    Started by ADA‎, 07-12-2012 03:08 PM
    • Replies: 1
    • Views: 1,254
    07-12-2012, 03:31 PM Go to last post
  39. Question Hypothesis Testing question

    Hi, I am new to this forum. I need desperate help. I am taking a QMB 3200 class and there is no book so I am lost. Here is my question: ...

    Started by Adalis‎, 12-13-2005 10:29 PM
    • Replies: 6
    • Views: 3,242
    12-14-2005, 12:50 PM Go to last post
  40. Hypothesis testing

    Here I am again....Thank you so much for helping me out yesterday. I am lost when it comes to Hypothesis testing....What do you think about this...

    Started by Adalis‎, 12-14-2005 12:31 PM
    • Replies: 4
    • Views: 4,176
    12-14-2005, 02:52 PM Go to last post
  41. Question Asymmetric (skewed) Data and Mean

    Hello, I have a bunch of sample data of the form: -0.90,.-0.89,-0.35,-0.55, .... +9.96 ie. 9 out of 10 data points are small negatives and the...

    Started by Adam‎, 07-12-2007 11:51 AM
    • Replies: 1
    • Views: 3,778
    07-12-2007, 11:56 AM Go to last post
  42. Standardizing Similar Groups with Different Internal Variables

    I am on the student government at a college, i feel like there has to be a way to create a scoring system for a organization. For example like lets...

    Started by Adam Michael Nikel‎, 10-25-2011 10:25 PM
    group comparison, standardization, variable selection
    • Replies: 0
    • Views: 1,594
    10-25-2011, 10:25 PM Go to last post
  43. t test confusion

    Hi first post, thanks for your help. Background: I've designed an interface for remotely controlling unmanned vehicles. The interface will be...

    Started by adam.hassell@gmail.com‎, 03-17-2008 09:17 PM
    • Replies: 1
    • Views: 1,916
    03-20-2008, 08:08 PM Go to last post
  44. equation for critical values of q

    Hello, I am looking for the equation(s) in how to calculate critical values of q. As you know q is used in doing Turkey's multiple comparison. I...

    Started by Adam00‎, 10-24-2010 06:36 PM
    • Replies: 1
    • Views: 8,014
    10-24-2010, 07:52 PM Go to last post
  45. Looking for help! which software to use??

    Hi Guys, I have a small amount of experience using SPSS and am currently using this for some work on statistical analysis of sports injuries in a...

    Started by Adam25‎, 09-18-2012 04:48 AM
    • Replies: 4
    • Views: 1,318
    09-19-2012, 08:11 PM Go to last post
  46. Correlation Analysis Against Artificial / Ranked Factor(s)

    Guys, I have an interesting situation here and a few questions related. Let me sketch it out. SITUATION: Someone conducted a correlation analysis...

    Started by adamas‎, 02-29-2012 09:14 AM
    • Replies: 1
    • Views: 1,699
    03-02-2012, 12:18 PM Go to last post
  47. Factor Analysis/Prinicpal Component Analysis: Reporting to APA Style

    Hello All, Desperate for help! I've performed a principal component analysis on a pilot study of a questionnaire I created. I have removed poor...

    Started by AdamC‎, 02-09-2008 06:11 AM
    • Replies: 1
    • Views: 30,411
    02-12-2008, 03:16 PM Go to last post
  48. How to calculate sample size

    I learned it before and i know it's basic but need your help, i want to calculate the sample size needed (alpha - 0.05 , power -0.8) in the following...

    Started by adamd‎, 04-10-2010 10:28 AM
    • Replies: 2
    • Views: 6,281
    04-13-2010, 07:20 PM Go to last post
  49. Question Help with Medical Stats

    Okay, I am a doctor in the UK, and have conducted a survey of practice before and after a teaching course. Stats was never my strong point! I now...

    Started by adamf‎, 12-08-2008 06:04 AM
    • Replies: 0
    • Views: 2,711
    12-08-2008, 06:04 AM Go to last post
  50. Smile Shewhart Control Chart Calculate Alpha Errors Under Rules

    Two decision rules are given here. Assume they apply to a normally distributed quality characteristic and the sample size is n=5. Rule 1: The...

    Started by AdamMc88‎, 02-06-2012 08:29 PM
    chart, control, process control, shewhart, statistics
    • Replies: 0
    • Views: 5,729
    02-06-2012, 08:29 PM Go to last post
  51. Evaluating differences between repeated measurements of one group to another

    I'm having difficulties understanding what type of statistical testing I need for my questions. My measurements include the following: Organism 1 ...

    Started by AdamSwansea‎, 05-31-2014 05:16 PM
    • Replies: 0
    • Views: 1,005
    05-31-2014, 05:16 PM Go to last post
  52. One sample t-test

    Hi, This is probably an embarrassingly easy problem but I've looked all over the place and I can't seem to find the answer, or at least I don't...

    Started by adancer‎, 05-19-2012 02:44 PM
    mean of means, t-test
    • Replies: 10
    • Views: 2,033
    05-21-2012, 04:28 PM Go to last post
  53. z-test?

    Hi, I have satellite imagery for a specific 10km by 20km location for a specific time of year over an 11 year period (2000 to 2010). So 11 images...

    Started by adancer‎, 06-07-2012 12:00 PM
    • Replies: 5
    • Views: 3,084
    06-07-2012, 03:33 PM Go to last post
  54. confidence interval test

    Hey everyone- I am rather new to statistics and am having difficulty with the following question: For a group of 10 individuals who have been...

    Started by adasiu‎, 10-22-2007 09:27 AM
    • Replies: 0
    • Views: 2,700
    10-22-2007, 09:27 AM Go to last post
  55. class width

    would the class width be: 1. 20-40 this class width would be 20 2. 11.5 - 14.3 this class width would be 2.8 rounded up to 3 is this...

    Started by adasiu‎, 10-22-2007 10:36 AM
    • Replies: 0
    • Views: 4,775
    10-22-2007, 10:36 AM Go to last post
  56. t test or CI

    a group of 10 students subjected to stress display a mean number of 120 heartbeats/min with a SD of 4. If you wanted to be 95% confident that...

    Started by adasiu‎, 10-22-2007 06:52 PM
    • Replies: 0
    • Views: 2,217
    10-22-2007, 06:52 PM Go to last post
  57. Chi-square analysis -- evaluating the difference between two groups

    I am assessing a study on the habitat distribution of the woodland vole, where the independent variable is habitat type and the dependent variable is...

    Started by adastraperaspera‎, 03-16-2009 09:27 AM
    • Replies: 3
    • Views: 4,794
    03-22-2009, 05:13 PM Go to last post
  58. help with count regression for rate data using SAS

    Hi, I am a beginner SAS user and studying CDA with baby steps. I am using Agresti's book, "An introd to CDA" 2nd ed, which I like very much. ...

    Started by adata‎, 12-13-2010 09:45 PM
    • Replies: 1
    • Views: 2,628
    03-04-2012, 01:12 PM Go to last post
  59. Measurement accuracy

    This should be a fairly simple question. If I take say, 200 temperature readings, recorded to the nearest degree, with half (ie 100) having "less...

    Started by adb‎, 03-03-2009 11:33 PM
    • Replies: 0
    • Views: 2,007
    03-03-2009, 11:33 PM Go to last post
  60. Global Temperature Measurement Accuracy

    Weather station temperature data is currently measured by automatic weather stations to an accuracy of 0.1 degrees but recorded to the nearest...

    Started by adb‎, 03-04-2009 03:16 PM
    • Replies: 0
    • Views: 2,827
    03-04-2009, 03:16 PM Go to last post

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