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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: 79,986
    07-16-2014, 12:01 PM 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 10:44 AM
    • Replies: 0
    • Views: 27,343
    09-30-2005, 10:44 AM Go to last post
  1. Loglinear Analysis

    Hi, I work in a university and am trying to analyse a dataset that contains data for a number of years on whether students perform sufficiently...

    Started by statslearner100‎, Today 10:05 AM
    • Replies: 0
    • Views: 69
    Today, 10:05 AM Go to last post
  2. Basic Measurement Error when calculating the Mean

    Hi all, I have a question about measurement error and how it can play a role when calulating the error of the mean. I have an automated process...

    Started by cp51‎, 12-16-2014 12:01 PM
    • Replies: 6
    • Views: 160
    Yesterday, 12:12 PM Go to last post
  3. Question What's the phenomenon when something is less likely to occur as time goes on?

    Let's say my friend says "I'll probably call you today". It's 8am. There's some % chance of him calling before 5pm. Let's say that's X%. So...

    Started by billybass‎, 12-18-2014 04:08 PM
    • Replies: 1
    • Views: 77
    Yesterday, 11:55 AM Go to last post
  4. Calculating effect size when there are multiple outcomes

    Hi, I'm trying to work the effect size for a study in which there are several outcomes for the same intervention. The intervention is a strength...

    Started by Darkest Horse‎, 12-17-2014 07:55 AM
    • Replies: 1
    • Views: 116
    Yesterday, 04:57 AM Go to last post
  5. Calculating an Attendance Factor -Please Help.

    Hello, I am calculating an attendance factor by dividing the average daily attendance by the highest single daily attendance occurrence. eg. ...

    Started by mike1199‎, 12-18-2014 04:56 PM
    • Replies: 2
    • Views: 110
    12-18-2014, 06:18 PM Go to last post
  6. Lightbulb method/metric of comparing two random samples and their impact

    Hello I have the following problem - given a set S of N=100000 data elements I need to extract a random sample R of size n=20 and then for each...

    Started by sorin‎, 12-18-2014 09:45 AM
    random sample comparison
    • Replies: 0
    • Views: 55
    12-18-2014, 09:45 AM Go to last post
  7. Question Covariance of two variables, multiple individuals

    I have a data set with two variables (A and B), but variable B was measured for multiple individuals (B1, B2, B3, B4). Is there a way to calculate a...

    Started by itendswithe‎, 12-16-2014 05:29 PM
    • Replies: 3
    • Views: 192
    12-17-2014, 06:38 PM Go to last post
  8. Question Selecting a median curve?

    Interested to see how people would do this... :confused: I have fitted a number of curves to my data sets, and plotted them together. What I...

    Started by yccmp‎, 12-17-2014 05:28 PM
    • Replies: 1
    • Views: 85
    12-17-2014, 06:29 PM Go to last post
  9. Basic question: is the std of complex numbers the std of its components?

    Sorry for the basic question, I searched the internet but could not get a simple and clear answer. Application: I want to compute the std of a...

    Started by yaraeovento‎, 12-17-2014 03:11 PM
    angle, complex numbers, standard deviation
    • Replies: 1
    • Views: 83
    12-17-2014, 05:19 PM Go to last post
  10. Post-hoc after ANOVA < 0.05

    Working on tests for some survey questions for a dissertation. I am able to reject one Hypothesis with a 0.042 One way ANOVA. I have 5 groups in...

    Started by novadar‎, 12-15-2014 03:49 PM
    • Replies: 12
    • Views: 327
    12-17-2014, 09:40 AM Go to last post
  11. What statistical method to use in SPSS?

    Hello everybody here, l am new in staitistics, and l am working on an assignment to test volunteering behaviour of people in Country 1. I am...

    Started by Manjola‎, 12-17-2014 08:17 AM
    • Replies: 0
    • Views: 117
    12-17-2014, 08:17 AM Go to last post
  12. Changing a target value that minimize the product being outside the specifications in

    I was doing problems in the article here. http://elearning.vtu.ac.in/10/enotes/06IPIM65/Mod10-NVN.pdf In the question on page 16

    Started by Clarkson‎, 12-17-2014 06:52 AM
    control chart, quality
    • Replies: 0
    • Views: 70
    12-17-2014, 06:52 AM Go to last post
  13. Finding ciritical W Values for Shapiro Wilk Test

    Hey, my first post here =) First off all, english is not my first language, so it is difficult for me to translate the scientific terms into...

    Started by JanJan‎, 12-17-2014 06:31 AM
    • Replies: 0
    • Views: 72
    12-17-2014, 06:31 AM Go to last post
  14. Analysis of possible variables causing incorrect test results (false-positive etc)

    Dear geniuses, Thank you in advance to hearing my plea. First off, I'm new to the world of statistics, so if possible please keep it plain and...

    Started by BasW‎, 12-16-2014 02:56 PM
    • Replies: 3
    • Views: 146
    12-16-2014, 04:16 PM Go to last post
  15. Comparing regression equations

    Hello! I have a question about how to compare regression equations and regression coefficients. I have data set A with n data points, and two...

    Started by smm106‎, 12-16-2014 03:28 PM
    coefficients, hypothesis testing, regression equation
    • Replies: 0
    • Views: 115
    12-16-2014, 03:28 PM Go to last post
  16. Confused which test would help me

    Hello! I have a problem with defining what method I should use. I have two groups in my data file. One is control group, the other one was treated...

    Started by Echoes‎, 12-16-2014 06:19 AM
    distance, heterogeneity, independent sample
    • Replies: 4
    • Views: 153
    12-16-2014, 01:24 PM Go to last post
  17. Non Parametric test that does not assume independence of data

    I am trying to test whether forecasted data and actual data in the same time period are significantly different for a given time period. T test...

    Started by bball3212‎, 12-16-2014 10:00 AM
    • Replies: 3
    • Views: 151
    12-16-2014, 01:07 PM Go to last post
  18. Changing process average in control charts

    Data is given for a X bar and R chart of subgroup size=4. . The control limits are for X bar chart: center line=178.46...

    Started by Clarkson‎, 12-16-2014 12:36 PM
    control chart, quality
    • Replies: 0
    • Views: 64
    12-16-2014, 12:36 PM Go to last post
  19. Which statistical analysis should be used?

    Hello everyone I have seven localities from which I collected different species of plants (small number of species aout 30) I want to include some...

    Started by Anawi‎, 12-15-2014 12:02 PM
    • Replies: 3
    • Views: 132
    12-16-2014, 10:31 AM Go to last post
  20. Target Distribution

    Hello, This is my first post. I'm a elementary math teacher who likes to look at scores to find some deeper truth about mine and my students'...

    Started by jsraadt‎, 12-14-2014 05:02 PM
    • Replies: 14
    • Views: 277
    12-16-2014, 07:41 AM Go to last post
  21. Standard deviation and sample size

    Hi. I have no background on statistics, so please just go down to fundamental for me. But here are some basic questions about statistics and standard...

    Started by risingstar3110‎, 12-03-2014 10:26 PM
    model, precision
    • Replies: 12
    • Views: 595
    12-16-2014, 05:52 AM Go to last post
  22. Plugins to write in statistiscal notation in Wordpress sites

    Hello, What plugins do you recommend to write statistical notation in Wordpress sites ? Thank you

    Started by pjssms‎, 12-15-2014 06:21 PM
    • Replies: 0
    • Views: 88
    12-15-2014, 06:21 PM Go to last post
  23. Which inferential test?

    Hello, The hereunder is an exercise I have to complete. I am having issues with answering questions. Study: Researchers were interested in...

    Started by treviswild‎, 12-14-2014 05:44 PM
    inferential test
    • Replies: 4
    • Views: 175
    12-15-2014, 02:19 PM Go to last post
  24. Trying to strenghten validity of sample

    Hi, this is my second post in this forum (the first one in the new member thread). I am turning to this thread in hope for getting some advice on...

    Started by Becky1‎, 12-14-2014 04:33 PM
    • Replies: 4
    • Views: 210
    12-15-2014, 04:42 AM Go to last post
  25. degrees of freedom in ANCOVA?

    So we were given this problem: Parasites are energetically expensive and can have both sub-lethal and lethal effects on snails (the hosts). To test...

    Started by nshrkat‎, 12-14-2014 02:54 PM
    • Replies: 0
    • Views: 109
    12-14-2014, 02:54 PM Go to last post
  26. How to calculate sample size manually ?

    Hello If My Confidence Level = 95% Margin of error = 5% Number of observation = 211 How can i calculate the sample size ? Can someone...

    Started by hanialbarni‎, 12-14-2014 03:02 AM
    • Replies: 2
    • Views: 174
    12-14-2014, 11:40 AM Go to last post
  27. Which analysis to take

    Hello I strugle with the question which analysis I have to take. I ve got 2 categorical ordered data eg. frequencies of bad moods: never, 1 to 3...

    Started by roger20‎, 12-13-2014 06:20 PM
    • Replies: 1
    • Views: 149
    12-14-2014, 04:13 AM Go to last post
  28. Question The z-scores of the 68-95-99.7 rule aren't matching up with the values in my z-table

    The z-scores from the 68-95-99.7 rule, which are 1, 1.96 (or 2), and 3 according to my textbook, arent matching up with the values i get if i try to...

    Started by Psyclone‎, 12-13-2014 11:29 PM
    standard deviation, z-score, z-table
    • Replies: 2
    • Views: 158
    12-13-2014, 11:39 PM Go to last post
  29. Trend Analysis: Mann Kendall

    I doing trend analysis on rainfall using mann-kendall. I have daily rainfall data for 60 years. My p value is close to 0 which indicates that...

    Started by prakritinaswa‎, 01-30-2014 12:21 AM
    • Replies: 1
    • Views: 401
    12-13-2014, 04:57 PM Go to last post
  30. help!! I have a test and none of this makes sense.

    Hello! I have an exam on inferential statistics, etc and need serious help.

    Started by ashleyw‎, 12-12-2014 08:55 PM
    • Replies: 2
    • Views: 231
    12-13-2014, 08:25 AM Go to last post
  31. Nested Case Control Study

    Hi, I have 195 cases and I want to find 4 randomly controls. Can I use propensity score matching to find controls matched to the cases? ...

    Started by biscodyl‎, 12-13-2014 06:46 AM
    case control; matched
    • Replies: 0
    • Views: 108
    12-13-2014, 06:46 AM Go to last post
  32. Research Help!

    Hi all. What is the appropriate statistical test for comparing two seperate groups who's data is independent from one another? Different people in...

    Started by vyelence‎, 12-11-2014 09:54 PM
    • Replies: 3
    • Views: 213
    12-12-2014, 05:31 PM Go to last post
  33. Regular or paired t-test?

    I need to compare results of running an air dispersion software at different scenarios (varying in the amount of the dispersed material) for 6...

    Started by Scrooge‎, 12-12-2014 12:03 PM
    • Replies: 3
    • Views: 151
    12-12-2014, 02:43 PM Go to last post
  34. Wilcoxon and Mann-Whitney Test

    Hello, I need to do one of these two statistical tests, I have a database on the consumption of fuel rods in each of the regions of my country,...

    Started by askazy‎, 12-11-2014 07:11 AM
    • Replies: 14
    • Views: 245
    12-12-2014, 01:21 PM Go to last post
  35. Expected Value of Y = max (X1, X2, X3, .... , Xn)

    I'm having a hard time figuring out what the expected value of Y = max(X1, X2, X3, ... , Xn) with pdf (x;θ) = 2x/θ^2. So it is the nth value of order...

    Started by Shunichi‎, 12-11-2014 09:57 PM
    expected value, order statistics
    • Replies: 1
    • Views: 155
    12-11-2014, 11:34 PM Go to last post
  36. Comparing Groups 2 sample T-test or Anova

    So I have a word problem that I can't get my head around. Perhaps because the wording of the question is leading me down the wrong path about the...

    Started by KennyC‎, 12-11-2014 02:13 PM
    anova, comparing groups, t-test, word problems
    • Replies: 3
    • Views: 180
    12-11-2014, 03:21 PM Go to last post
  37. Databases

    I have been asked to develop a universal data base to house all of our company's wildlife survey data that is currently housed in Excel files. We...

    Started by dynamicwildlife‎, 12-11-2014 10:21 AM
    • Replies: 2
    • Views: 169
    12-11-2014, 11:46 AM Go to last post
  38. How to calculate? Gretagarbo?

    Hi, I'm a doctor and conducting a huge study for Pfizer. Now all the data is collected and i'm trying to make statistical calculations. Total...

    Started by drgunnar‎, 12-11-2014 07:54 AM
    • Replies: 1
    • Views: 184
    12-11-2014, 09:01 AM Go to last post
  39. Standard deviation of two sets from only individual set descriptive statistics

    I have two sets of numbers and I have access to their averages and standard deviations. However, I do not have easy access to the actual numbers...

    Started by abakshi‎, 12-10-2014 02:32 PM
    • Replies: 2
    • Views: 171
    12-11-2014, 08:22 AM Go to last post
  40. [Checking/Help] Hypothesis Testing and Chi-squared Test

    Hi there, I have two questions that need to be submitted online, and was hoping someone could check my answers before I submit them. Question 1...

    Started by TaylorC‎, 12-07-2014 09:57 AM
    • Replies: 13
    • Views: 350
    12-11-2014, 05:31 AM Go to last post
  41. Question What type of curve is this?

    The left one is a logistic curve / sigmoid function e.g. y=1 / 1+exp(-bx) What would be the typical name for the curve on the right / typical...

    Started by yccmp‎, 12-10-2014 11:33 PM
    curves, logistic, regression model
    • Replies: 1
    • Views: 101
    12-11-2014, 03:29 AM Go to last post
  42. Confidence interval conceptual question

    Why is creating a confidence interval not a viable alternative to a chi-square or an ANOVA? I'm guessing it's because a CI can't give more...

    Started by Zebo‎, 12-11-2014 12:01 AM
    • Replies: 0
    • Views: 105
    12-11-2014, 12:01 AM Go to last post
  43. How to compare if two sets data are the same

    I'm trying to compare measurements that I took to measurements that someone else took on the same exact things. Im trying to see if they are...

    Started by Biology‎, 12-10-2014 06:21 PM
    • Replies: 4
    • Views: 216
    12-10-2014, 07:51 PM Go to last post
  44. Do statisticians often work with scientific experiments?

    I don't know anything about statistics(or life or anything)... anyway, I am interested in knowing how statistics ties into the scientific method. ...

    Started by Imacreep‎, 12-10-2014 02:58 PM
    scientific method
    • Replies: 0
    • Views: 101
    12-10-2014, 02:58 PM Go to last post
  45. Multiplying two normal distributions

    Hello, This problem involves an interference fit problem in engineering. In an interference fit one part is pressed into another part. One of the...

    Started by ilikeshirt‎, 12-10-2014 09:38 AM
    • Replies: 4
    • Views: 170
    12-10-2014, 02:23 PM Go to last post
  46. Required sample size to distinguish means of two binomially distributed rv

    Hello, Currently trying to work out the best way to calculate the number of samples that would be required to get a certain confidence interval. ...

    Started by s0medave‎, 12-10-2014 01:18 PM
    binomial, distinguishing means, inverse t-test, t-test
    • Replies: 0
    • Views: 101
    12-10-2014, 01:18 PM Go to last post
  47. What is the best descriptive stats to present this data

    I have a table where the major categories are on the columns and they total to 100% for each column. Then the subcategories are on the rows and each...

    Started by emekadavid‎, 12-07-2014 03:43 PM
    descriptive statistics
    • Replies: 2
    • Views: 198
    12-10-2014, 05:41 AM Go to last post
  48. help w/ anova test selection & factors (groups)

    Hello there. Stats noob here I'm an IT major so apparently stays is required for me. I have an assignment here and one of the questions is really...

    Started by theblackdog‎, 12-10-2014 03:13 AM
    2-way anova, 2-way repeated measures, anova
    • Replies: 0
    • Views: 135
    12-10-2014, 03:13 AM Go to last post
  49. Pass Rate Calculation for Multi-tiered Tests

    Hello, I am working on a project in an educational setting that requires individuals to complete multiple tests. In particular, an individual must...

    Started by markb1‎, 12-09-2014 07:30 PM
    • Replies: 0
    • Views: 175
    12-09-2014, 07:30 PM Go to last post
  50. Can Z, t, and chi square critical values be either positive or negative?

    As the question states. I thought it might be possible for a z and t because of the two tails in a normal distribution. Not sure about chi because...

    Started by joestats‎, 12-09-2014 04:16 PM
    • Replies: 2
    • Views: 159
    12-09-2014, 07:17 PM Go to last post
  51. Choosing alpha for Pearson's correlations

    Does anyone know of any good references that discuss how to choose alpha for a Pearson's correlation?

    Started by Phdstudentz‎, 12-08-2014 04:35 PM
    • Replies: 10
    • Views: 215
    12-09-2014, 04:48 PM Go to last post
  52. Multiple imputation on categorical (dummy coded) data

    Hello, I have a question regarding multiple imputation for categorical variables, and hope very much that someone can answer me. I am using SPSS...

    Started by Sabine‎, 12-09-2014 09:56 AM
    multiple imputation, regression analysis
    • Replies: 0
    • Views: 131
    12-09-2014, 09:56 AM Go to last post
  53. Some confuse about Regression Model(with example)

    I am a college student who has studied basic statistics. Recently, i have read a paper which call "Creating a Profitable Betting Strategy for...

    Started by anovatable‎, 12-09-2014 05:40 AM
    • Replies: 0
    • Views: 164
    12-09-2014, 05:40 AM Go to last post
  54. Stepwise regression model with dependent variable categorical (help)

    Hello , Can I use the step wise regression model with a categorical dependent variable? Is coding the dependent variable as 0 or 1 is enough to...

    Started by tarekshah‎, 12-08-2014 03:07 PM
    regression analysis
    • Replies: 7
    • Views: 189
    12-08-2014, 05:54 PM Go to last post
  55. Help with model Matrix GLM

    Hey guys been browsing the forums for a while, and usually find what I need! This is a tad more specific though so Ive made an account!! I've been...

    Started by Tomos‎, 12-08-2014 05:38 PM
    • Replies: 0
    • Views: 136
    12-08-2014, 05:38 PM Go to last post
  56. Least square line of best fit

    I am looking for a references for the least square line of best fit. Preferably a journal paper. Thanks!

    Started by Phdstudentz‎, 10-15-2014 10:59 AM
    • Replies: 3
    • Views: 356
    12-08-2014, 04:41 PM Go to last post
  57. Strugling with Ttests

    Hi everyone, This is my first post on this forum. I'm on a Sports science course and during a practical we had each participant measure their...

    Started by Rexkid‎, 12-07-2014 11:06 AM
    • Replies: 5
    • Views: 200
    12-08-2014, 06:37 AM Go to last post
  58. importing data in spss

    i have my stress questionnaire with the side heading of 6 each side heading containing 10 questions totally 60 questions are there. how should i...

    Started by priyamaha2010‎, 12-08-2014 05:03 AM
    • Replies: 2
    • Views: 125
    12-08-2014, 05:17 AM Go to last post
  59. What is the difference between factor and cluster analysis

    Can you please explain me the difference between those 2- cluster and factor analysis. And if you can please give me a simple example to reinforce...

    Started by Kie27‎, 12-07-2014 12:06 PM
    • Replies: 1
    • Views: 173
    12-08-2014, 02:59 AM Go to last post
  60. Forecasting the future gallup poll results - what methods should be used?

    Hello guys, My first post in TalkStats. Lately I have been interested in politics. It has been few years since my statistics studies and therefore...

    Started by hesber‎, 12-07-2014 07:20 PM
    • Replies: 0
    • Views: 157
    12-07-2014, 07:20 PM Go to last post

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