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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: 197,019
    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: 66,887
    09-30-2005, 09:44 AM Go to last post
  1. Question Entering & analysing aggregate categorical data in SPSS?

    Hi all, Just wondering if anybody knows how to enter and analyse aggregate categorical data into SPSS? I have been provided with prisoner data...

    Started by SusanB‎, 10-19-2011 01:26 AM
    • Replies: 1
    • Views: 4,207
    10-19-2011, 02:42 AM Go to last post
  2. Z score

    I am having difficulty understanding the Z score. Its looks like that SD and Z score is doing the same function? Could you please explain with small...

    Started by Amjad‎, 01-25-2006 01:18 PM
    • Replies: 2
    • Views: 4,206
    01-25-2006, 05:41 PM Go to last post
  3. small sample size n=18

    I have two samples and I was wondering if there is a way to standardize the calculations in my smaller sample so that the calculations in both...

    Started by amperes‎, 04-28-2011 04:45 PM
    • Replies: 6
    • Views: 4,206
    04-30-2011, 07:21 PM Go to last post
  4. ANCOVA post hocs?

    How do I do post hocs for ANCOVAs?

    Started by afairclo‎, 04-18-2009 01:09 AM
    • Replies: 2
    • Views: 4,205
    04-18-2009, 01:23 PM Go to last post
  5. Repeated Measures - unequal time points across groups

    Hi everyone, I need to compare two groups. Group 1 will take drug X for 12 months and Group 2 will take drug X for 8 months. They will be given...

    Started by ceperras‎, 01-22-2009 03:58 PM
    • Replies: 2
    • Views: 4,203
    01-22-2009, 08:44 PM Go to last post
  6. gamma-function

    gamma-function g(t) = ymax * t^(alpha) * exp( alpha * (1-t)) With known ymax and alpha, what is the maximum slope of g(t) (with t>0)?

    Started by pongtep‎, 05-22-2013 12:04 AM
    2 Pages
    1 2
    gamma function
    • Replies: 23
    • Views: 4,203
    05-28-2013, 02:20 PM Go to last post
  7. 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: 4,202
    05-09-2007, 10:24 AM Go to last post
  8. help

    Honestly I have no idea how to do these I dont even know where to start please help In the past, of all the students enrolled in “Basic Business...

    Started by statsdummy‎, 10-20-2005 02:44 PM
    • Replies: 1
    • Views: 4,201
    10-20-2005, 03:37 PM Go to last post
  9. Cholesterol Scales of Measurement?

    Hello guys hope you can help me with this simple question: would you be so kind to tell me what is the Scale of Measurement of Cholesterol ? ...

    Started by dansar‎, 01-10-2008 09:47 AM
    • Replies: 3
    • Views: 4,200
    03-27-2012, 07:24 AM Go to last post
  10. 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: 4,199
    12-14-2005, 02:52 PM Go to last post
  11. Case vs Group of Controls

    Hi. I am a medical resident doing a required research project. Perhaps someone can help me by pointing me towards the correct statistical test. I...

    Started by STOUCHA‎, 05-16-2008 04:51 PM
    • Replies: 9
    • Views: 4,199
    05-28-2008, 08:43 PM Go to last post
  12. Four-Way ANOVA

    Hello, I want to analyse the effects of four categorical independent variables on one dependnet variable. For each independent variable, I have two...

    Started by rahuls‎, 08-23-2010 01:47 PM
    • Replies: 0
    • Views: 4,199
    08-23-2010, 01:47 PM Go to last post
  13. preferred equation display

    I'm looking for people's opinions on the best way to present the same equation.Below are a series of differently formatted equations. Which equation...

    Started by trinker‎, 08-13-2012 08:57 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,199
    08-18-2012, 08:53 AM Go to last post
  14. Random variables problem

    Hello all. I'm having a lot of trouble with several of the problems on my latest stat homework. Up until now I've understood almost everything, but...

    Started by player‎, 12-06-2010 08:54 PM
    • Replies: 7
    • Views: 4,196
    12-07-2010, 10:27 AM Go to last post
  15. Fisher Vs Neyman "Test of significance" Long term error rates.

    I have just recently achieved a small insight into the differences between Fisher's and Neyman's theories in significance testing; however, I am...

    Started by Ta2812‎, 02-27-2011 08:22 PM
    • Replies: 1
    • Views: 4,196
    02-27-2011, 10:11 PM Go to last post
  16. Multiple Correlations and managing Type 1 error

    Hi all I am currently resubmitting a paper in the behaviour psych area and we have had mixed reviews re how to manage type 1 error due to our...

    Started by sals77‎, 03-03-2008 12:29 PM
    • Replies: 3
    • Views: 4,194
    03-03-2008, 04:23 PM Go to last post
  17. Converting scores to a metric

    Scores for the AAT are reported with a mean of 80 and a standard deviation of 8. Martina received a raw score of 84 on the math portion of the AAT. ...

    Started by latonya1‎, 06-17-2007 01:14 PM
    • Replies: 8
    • Views: 4,193
    06-18-2007, 12:48 PM Go to last post
  18. Var(x + c)

    This is an elementary question, however, I am a little stuck :( If x is a random variable and c is a constant, how would you expand that? For...

    Started by xfunctionx‎, 05-19-2009 03:40 PM
    • Replies: 1
    • Views: 4,193
    05-19-2009, 05:27 PM Go to last post
  19. calculating statistical difference

    Hey everyone, I am trying to figure out how to calculate if a survey statistic is different from a benchmark or goal. The statistic is a little...

    Started by willemory‎, 02-26-2008 06:18 PM
    • Replies: 2
    • Views: 4,192
    02-27-2008, 09:25 AM Go to last post
  20. Dickey-Fuller, WST table interpretation

    Hi guys! Here is the table with Dickey-Fuller and Weighted Symmetric Test results. I need some help with interpreting it. Please help me identify...

    Started by E574‎, 04-14-2011 10:51 AM
    • Replies: 0
    • Views: 4,189
    04-14-2011, 10:51 AM Go to last post
  21. Question Significant difference between two proportions?

    Is it possible to test for a significant difference between groups if all the information you have is the number of people in each group and the...

    Started by kfar‎, 08-29-2011 11:17 AM
    • Replies: 3
    • Views: 4,189
    08-29-2011, 11:35 AM Go to last post
  22. Apples and Pears

    Hi all, I have a challenge for you, this might be quite easy or quite difficult... as I neither know the answer nor have any idea of the solution....

    Started by Bobbins‎, 07-02-2008 12:50 PM
    • Replies: 2
    • Views: 4,188
    07-07-2008, 01:04 PM Go to last post
  23. Question regarding interaction terms in a nested ANOVA

    Hi All I am a master’s student and I have a statistical question. I have an experiment evaluating the effects of intertidal elevation (fixed; 3...

    Started by cwatt‎, 04-28-2009 01:08 PM
    • Replies: 0
    • Views: 4,187
    04-28-2009, 01:08 PM Go to last post
  24. Percentages

    Hello, I am quite new in statistics so sorry if my question is not clear enough. After creating a structure in excel i ended up with a column...

    Started by Elina‎, 12-11-2010 03:04 PM
    • Replies: 3
    • Views: 4,187
    12-12-2010, 10:08 AM Go to last post
  25. Question Data analysis - which test is best

    I would like to know which test would be appropriate for testing my hypothesis. I am doing a research project on parasitic infections in snail...

    Started by Justice!‎, 04-22-2013 08:20 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 4,187
    04-25-2013, 09:29 AM Go to last post
  26. Hosmer-Lemeshow Test Table Interpretation

    Hi! I need someone to interpret this. Sorry, I got no knowledge at all. I tried searching the forum but the analysis chapter of my thesis keeps on...

    Started by Anylopectina12‎, 04-23-2014 09:06 AM
    • Replies: 6
    • Views: 4,186
    05-01-2014, 10:19 PM Go to last post
  27. how to check for equal distribution

    Hello, I have been struggling with this problem and would appreciate any guidance or help anyone has to offer! A chef at a 5-star restaurant...

    Started by hazelhermit‎, 05-21-2010 09:15 PM
    • Replies: 1
    • Views: 4,184
    05-21-2010, 09:54 PM Go to last post
  28. Find y as a function of x

    f(x) is Uniform from 0,1 Find y as a function of X I've did this awhile ago in a past class, I'm looking through my notes and book trying...

    Started by HHB‎, 02-01-2011 06:17 PM
    • Replies: 3
    • Views: 4,184
    02-01-2011, 11:45 PM Go to last post
  29. Need help with Seasonal index

    Hi I just need some advice with making a seasonal index. I have twenty years of monthly data, I've made a pivot table to combine each month's...

    Started by MarkF‎, 03-27-2011 12:14 AM
    • Replies: 1
    • Views: 4,184
    03-28-2011, 06:36 AM Go to last post
  30. Presenting the results: Continuous variables, Normally distributed vs non normally

    Hi :) My question is most probably simple but I can't find an answer to it. According to my stats textbook one should report continuous...

    Started by Elha‎, 09-23-2013 08:59 PM
    presentation
    • Replies: 2
    • Views: 4,184
    09-25-2013, 10:19 AM Go to last post
  31. Correlation and Regression on Excel?

    HOW?! a. Draw scatter plot for the variables b. Compute the value of the correlation coefficient. c. State the hyptothesis. 12. A medical...

    Started by benchiefjr‎, 12-10-2006 07:58 PM
    • Replies: 6
    • Views: 4,183
    12-13-2006, 02:48 AM Go to last post
  32. Question Need guidance

    Guidance and not the answer is what I would be most grateful for...I am trying to learn and keep seeing obstacles I cannot get around. The data I...

    Started by August 15‎, 08-05-2010 09:51 AM
    • Replies: 2
    • Views: 4,183
    08-05-2010, 08:14 PM Go to last post
  33. Studentised range value

    Hi, I am part of the way through conducting a Tukey hsd test and now require my studentised range critical value (qt). My problem: My df's and...

    Started by UK2008‎, 11-19-2008 12:27 PM
    • Replies: 4
    • Views: 4,182
    11-19-2008, 04:05 PM Go to last post
  34. 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: 4,182
    08-11-2009, 08:29 AM Go to last post
  35. Deconvolution of gamma distribution

    Notation: g(x,a,b) is the gamma distribution with shape a and scale b. The distribution g(x,1,1) is the standard exponential distribution. I have...

    Started by trsny‎, 11-14-2009 09:17 AM
    • Replies: 2
    • Views: 4,182
    11-14-2009, 05:35 PM Go to last post
  36. Likert: Fisher's exact OR Kruskal-Wallis?

    Hi, I've got a survey with 50 responses, and want to test for difference between three subgroups, and strength of association. I'm not happy to...

    Started by nicojx‎, 04-26-2012 09:38 AM
    fisher's exact test, kruskal-wallis, liker scale, small sample size, which test
    • Replies: 0
    • Views: 4,182
    04-26-2012, 09:38 AM Go to last post
  37. 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: 4,182
    02-21-2015, 10:44 AM Go to last post
  38. analysis for testing improvement size across 2 groups

    I would love input regarding what analysis to use Design: IV: 1 between subjects group (sought assistance, no assistance sought) DV: ...

    Started by lang‎, 06-16-2009 04:03 PM
    • Replies: 12
    • Views: 4,181
    06-17-2009, 10:29 AM Go to last post
  39. 2 samples t-test: normal or not?

    Hi. For a 2 sample t-test, where I'm checking the assumptions, I'm getting contradictory (at least to me) results regarding normality, between...

    Started by deltango‎, 01-24-2014 08:57 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,181
    07-16-2014, 09:47 PM Go to last post
  40. Time Series - Weakly Stationary

    The question is : Prove if the following time series is weakly stationary,give reasons for your answer. For this I need to solve the...

    Started by Fabregas04‎, 12-25-2010 01:37 PM
    • Replies: 0
    • Views: 4,180
    12-25-2010, 01:37 PM Go to last post
  41. Structural equation modeling--LISREL

    Are they any good books on how to interpret LISREL outputs?

    Started by Susanbwh‎, 02-08-2006 03:23 PM
    • Replies: 1
    • Views: 4,179
    02-04-2012, 02:24 PM Go to last post
  42. Stats Help

    Hi All, 1st time post here. I have a project where I am to do some data analysis for a 5 year trend of all submitted applications. I am using...

    Started by Caliboi‎, 09-05-2007 02:56 PM
    • Replies: 2
    • Views: 4,179
    09-05-2007, 08:40 PM Go to last post
  43. Variable type SOS

    i know it may sound stupid to some of you but i have a question i really need an answer to : In the SPSS i defined an IV as yes/no and marked...

    Started by doctor‎, 10-15-2008 07:36 PM
    • Replies: 2
    • Views: 4,179
    10-15-2008, 11:57 PM Go to last post
  44. ordered/ordinal logistic regression?

    Hi all, I am doing a study to figure out if there is a relationship between 6 leadership styles and level of employee satisfaction at a company. the...

    Started by krc‎, 12-18-2009 10:58 AM
    • Replies: 3
    • Views: 4,179
    12-27-2009, 01:15 PM Go to last post
  45. Question level of signifigance

    sample question, in 2000, 58% of females aged 15 years of age and older lived alone, according to the US Census Bureau. A sociologist wants to know...

    Started by Karva Mackey‎, 11-21-2010 02:31 PM
    • Replies: 1
    • Views: 4,179
    11-21-2010, 04:23 PM Go to last post
  46. How do you find the expected value, given 2 exponential random variables?

    This was my problem: X, Y are independent lambda-exponential random variables. Z = min(2X, Y). Calculate V(Z) and E(Z^2). Since Z = min(2X,...

    Started by saaam‎, 04-18-2011 10:01 AM
    • Replies: 1
    • Views: 4,179
    04-19-2011, 11:05 AM Go to last post
  47. Maximum likelihood estimator - geometric distribution

    Need help getting the MLE. Problem defines the geometric distribution as pi(1-pi)^y

    Started by wren‎, 08-28-2012 09:04 PM
    • Replies: 7
    • Views: 4,179
    08-28-2012, 10:32 PM Go to last post
  48. Feline Epilepsy: Please provide Guidance

    I have a 3 year old male cat (Isidore) with primary epilepsy of 1 year duration. I have recorded the dates and durations of his ictal phases: 7...

    Started by LowWaterMark‎, 11-23-2008 08:13 PM
    • Replies: 1
    • Views: 4,177
    11-24-2008, 10:47 AM Go to last post
  49. Estimate of travelling time

    Hello! I'm a Norwegian engineer, now located in Tunisia. Everyday i take a sort of taxi, called collective taxi to my Arabic lessons in the neighbor...

    Started by aleks6561‎, 09-25-2010 04:48 PM
    • Replies: 12
    • Views: 4,176
    09-30-2010, 12:55 AM Go to last post
  50. pilot study sample size

    Im doing a survey and I want to conduct my pilot study, im not so sure of how to calculate the sample size will you please help me ...

    Started by zeinabrahimi‎, 10-09-2011 12:29 AM
    • Replies: 4
    • Views: 4,176
    10-09-2011, 12:06 PM Go to last post
  51. Hypothesis testing in poisson distribution

    At a nuclear plant great care is taken to measure the employees health.These are the number of visits made by each of the 10 employees to the doctor...

    Started by Clarkson‎, 10-27-2013 08:51 AM
    hypothesis test, poisson distribution
    • Replies: 5
    • Views: 4,176
    10-28-2013, 10:25 PM Go to last post
  52. Unhappy basic help needed for Chi-square

    Hello all, I feel embarassed even having to ask this, but I'm not much of a numbers person, and I've worked myself into a corner. I would...

    Started by MathIdiot‎, 01-29-2011 04:08 PM
    • Replies: 4
    • Views: 4,175
    01-30-2011, 02:08 PM Go to last post
  53. Significance of the difference between two correlation coefficients

    Hi, based on the sample size I want to calculate whether to correlation coefficients are significantly different or not. I know that as a first...

    Started by beginner‎, 11-29-2010 10:30 AM
    • Replies: 0
    • Views: 4,174
    11-29-2010, 10:30 AM Go to last post
  54. I Can't believe no one knows?

    Hello, I have a set of data for 52 weeks that includes the revenue per customer, the till difference (money missing from the cash register or...

    Started by NED7578‎, 11-09-2010 11:21 AM
    • Replies: 6
    • Views: 4,173
    11-12-2010, 09:23 AM Go to last post
  55. Unhappy Some Statistics Homework help :(

    Hi guys I was doing my homework and got stuck on these questions: http://img219.imageshack.us/img219/306/20633307.png and...

    Started by sunshine_75‎, 03-21-2011 08:38 AM
    • Replies: 4
    • Views: 4,172
    03-21-2011, 12:00 PM Go to last post
  56. intraclass correlation: ANOVA vs. Linear Mixed Models

    Hello, I'm having an issue in calculating and interpreting intraclass correlation. For example: We have a repeated measures design for 20...

    Started by iceso‎, 06-09-2014 05:58 PM
    • Replies: 0
    • Views: 4,172
    06-09-2014, 05:58 PM Go to last post
  57. probability density function=P(X E (x,x+dx) )?

    "Let X be a continuous random variable. probability density function=f(x)=F'(x)=P(X E (x,x+dx) )" Now I don't understand why f(x) would be...

    Started by kingwinner‎, 01-17-2009 11:57 AM
    • Replies: 1
    • Views: 4,170
    01-17-2009, 12:24 PM Go to last post
  58. Comparing Two Percentages- which test

    Hello All, I'd be really grateful if anyone might be able to help me- trawling the internet and reading through my old A-level stats notes has...

    Started by lucy3784‎, 02-19-2012 10:21 AM
    • Replies: 2
    • Views: 4,169
    02-19-2012, 02:35 PM Go to last post
  59. Type III Tests of Fixed Effects or Estimates of Fixed Effects?????

    I have a statistical analysis problem for which I need your help. I am using SPSS to perform a linear mixed model with cosinor analysis to determine...

    Started by Circadian Dave‎, 06-05-2015 01:33 PM
    • Replies: 2
    • Views: 4,169
    06-05-2015, 02:22 PM Go to last post
  60. Question Which book would you buy ?

    I found 2 books at Amazon.com. Both are about linear regression. Both have good overall ratings. Book A has the following ratings: 5 5 5 4 4 3 3...

    Started by martinl‎, 01-25-2016 06:22 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,169
    02-18-2016, 08:38 PM Go to last post

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