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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: 196,737
    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: 66,744
    09-30-2005, 09:44 AM Go to last post
  1. Box Cox transformation in gretl?

    Hi I was trying to transform some data using the boxcox criteria, but i couldn't. I know the command is boxplot(series, d) being d the lamdba...

    Started by jfca283‎, 05-20-2014 10:19 AM
    • Replies: 0
    • Views: 3,454
    05-20-2014, 10:19 AM Go to last post
  2. Determine New Min and Std Deviation of Beta Curve after removing Zeros

    Hello. I have the results of a study that has the parameters of a Beta Curve. The Study is of 1000 drivers on a 10 hour trip. The average speed...

    Started by DJHarris71‎, 05-12-2014 11:23 AM
    • Replies: 1
    • Views: 1,048
    05-20-2014, 10:08 AM Go to last post
  3. Chi Square and Independent t-test Driving me INSANE

    I am trying to compute a X2 sq test and a independent t-test but so far nothing. For the chi-sq test this is the message I get Warnings No...

    Started by janice_82‎, 05-19-2014 06:25 PM
    • Replies: 5
    • Views: 2,855
    05-20-2014, 07:01 AM Go to last post
  4. Why we cannot use percentages in a chi square test?

    Hi everyone, I've got a very basic question. So basic that I could'nt found a respone in any forum o textbook. Why we can't use the percentages in...

    Started by Joey_Kiribati‎, 05-19-2014 06:34 AM
    • Replies: 4
    • Views: 1,552
    05-20-2014, 04:59 AM Go to last post
  5. Question Time series question

    Hi, If I have a time series that has a normal distribution of error from the mean is there a technique that lets me forecast the next period based...

    Started by leejayd‎, 05-20-2014 03:44 AM
    time series
    • Replies: 0
    • Views: 934
    05-20-2014, 03:44 AM Go to last post
  6. Standard Deviation question

    I am taking an economics of sports class at uni and, long story short, my data produced a z-value that is greater than 2 standard deviations away. ...

    Started by cambrid7‎, 05-19-2014 05:20 PM
    • Replies: 4
    • Views: 1,081
    05-19-2014, 08:18 PM Go to last post
  7. Generate 95% CI for left-censored data

    Is there a known method to generate 95% CI for left-censored assay data? For my assay data, there are around 60% of the sample data points that are...

    Started by fhpol‎, 05-19-2014 03:26 PM
    • Replies: 1
    • Views: 1,177
    05-19-2014, 06:08 PM Go to last post
  8. Bootstrap on quasi-poisson mixed model: conceptual questions

    There are four areas, each one with 18 points which, in turn, are surrounded by 10 plots. Each area is visited four times (session date are the same...

    Started by simone77‎, 05-19-2014 12:19 PM
    • Replies: 0
    • Views: 1,319
    05-19-2014, 12:19 PM Go to last post
  9. Planned comparison in Mixed designs

    Hi, Guys! Does anyone has a link or some material about Planned comparisons in orthogonal mixed designs? I m having some troubles exploring...

    Started by Felipe‎, 05-19-2014 12:06 PM
    • Replies: 0
    • Views: 731
    05-19-2014, 12:06 PM Go to last post
  10. T test question

    In looking at this t test we would expect the probability of the means to be less then zero. However we have found the t test is telling us the...

    Started by Parker Hentz‎, 05-19-2014 09:32 AM
    • Replies: 1
    • Views: 667
    05-19-2014, 12:03 PM Go to last post
  11. root mean square error

    Hi! I just want to ask whether taking the average of rmse valid? For example: average rmse = (rmse1+rmse2+rmse3)/3 Your answer is...

    Started by xerox01‎, 05-19-2014 08:16 AM
    • Replies: 2
    • Views: 569
    05-19-2014, 09:13 AM Go to last post
  12. Use of PCA to discover latent variable

    Hello, I'm currently struggling with my homework and need your help. I have to work with R. My initial matrix is composed of 27 variables of the...

    Started by gbennn‎, 05-19-2014 07:28 AM
    • Replies: 0
    • Views: 1,005
    05-19-2014, 07:28 AM Go to last post
  13. Find x,y,z coordinates using Inclination,Azimuth and depth.

    Hi we need to find x,y,,z coordinates. So basically, what we need is to be able to take the data in the columns I provided below and make a 3D...

    Started by suhas‎, 05-19-2014 06:41 AM
    • Replies: 0
    • Views: 3,895
    05-19-2014, 06:41 AM Go to last post
  14. Urgent help (again..): weird T-test results

    Hi again guys, I got some great answers in my last thread, but now I have another question regarding some results I got from my T-tests....

    Started by FastTimes‎, 05-18-2014 06:01 AM
    • Replies: 3
    • Views: 1,462
    05-19-2014, 06:29 AM Go to last post
  15. A question on an estimating equation

    This is a question that arose from studying Hogg and Craig "Introduction to Mathematical Statistics",7th edition, pg 568. Please see the attachment....

    Started by JohnK‎, 05-19-2014 05:17 AM
    • Replies: 0
    • Views: 850
    05-19-2014, 05:17 AM Go to last post
  16. Statistics Help

    I'm doing my review for stats, have the test later this week and going over the review I have a few questions since we don't have the answer sheet...

    Started by dave4405‎, 05-19-2014 03:16 AM
    • Replies: 0
    • Views: 1,187
    05-19-2014, 03:16 AM Go to last post
  17. maximum liklihood estimator

    y= x+e where e is error and x is an unknown constant. the error density function is exp(-e-1) for e>-1 and 0 otherwise Finding the maximum...

    Started by stephanie‎, 05-17-2014 02:58 PM
    • Replies: 1
    • Views: 987
    05-18-2014, 10:32 AM Go to last post
  18. Help Needed with choosing the tests

    Hi all, I'm doing a survey based research and need help in choosing tests in spss for comparing data. My sample included two populations (Urban &...

    Started by ankitaseeram‎, 05-18-2014 06:42 AM
    • Replies: 2
    • Views: 1,398
    05-18-2014, 09:44 AM Go to last post
  19. Chi-squared test

    I'm not a statistics student but I've been asked to do a chi-squared test to see if the difference in the number of finds in 2 different zones is...

    Started by Chrysophylax‎, 05-17-2014 02:25 PM
    • Replies: 0
    • Views: 784
    05-17-2014, 02:25 PM Go to last post
  20. Simple question

    Hi, I am new to SPSS so i hope you can help with a little question. I have 100 respondents were i have recorded their age and preferred drink...

    Started by bimmelim‎, 05-17-2014 04:54 AM
    • Replies: 1
    • Views: 1,437
    05-17-2014, 09:38 AM Go to last post
  21. Need help with choosing test

    Hi I know this will maybe sound too easy or simple but I have problem in choosing statistical test for my modest research. anyway I want to compare...

    Started by statboy_‎, 05-13-2014 09:20 AM
    • Replies: 5
    • Views: 1,764
    05-17-2014, 06:24 AM Go to last post
  22. Is it correct to fit INTEGER data to Gumbell distribution?

    I have data for about 50 years and for each year I have some integer (it represents max number of consecutive days without rain). May I fit gumbell...

    Started by gutompf‎, 05-17-2014 01:16 AM
    gumbel, integer variable
    • Replies: 0
    • Views: 1,134
    05-17-2014, 01:16 AM Go to last post
  23. Determining Point Estimate

    Hey everyone- I've been trying to solve this problem and it seems like there isn't enough information to come close to figuring out the point...

    Started by beccabecca‎, 05-16-2014 05:11 PM
    • Replies: 0
    • Views: 1,020
    05-16-2014, 05:11 PM Go to last post
  24. Help please - Mann-Whitney test and unequal sample sizes

    Hi there, I am hoping someone can help (I've been trawling textbooks, internet and this forum for days, but think I am looking at the wrong...

    Started by stennent‎, 02-26-2014 10:55 AM
    • Replies: 2
    • Views: 1,929
    05-16-2014, 11:09 AM Go to last post
  25. Comparing network properties of 2 groups of unequal sizes

    Hi, This may be a basic question. I wish to compare networks of 2 groups: 1st group: Controls. Size 30. 2nd group: Patients. Size: 80. ...

    Started by mexangel‎, 05-16-2014 10:48 AM
    network, unequal sample sizes
    • Replies: 0
    • Views: 898
    05-16-2014, 10:48 AM Go to last post
  26. Seeking help with a data set with small population size.

    I am doing a project where I need to analyze a data set that was obtained from a survey. The sample size is small 27 people, but there are a range...

    Started by tinman‎, 05-15-2014 11:25 PM
    • Replies: 2
    • Views: 1,067
    05-16-2014, 07:52 AM Go to last post
  27. Very urgent help (not sure how to approach a one-tailed problem)

    Hi guys, I am currently writing my thesis, and I am running out of time here. I keep getting stuck constantly in different parts of the thesis,...

    Started by FastTimes‎, 05-15-2014 05:52 PM
    • Replies: 12
    • Views: 1,774
    05-16-2014, 07:01 AM Go to last post
  28. My Test Grade and Asymmetrical Skewing

    I took a test 2 weeks ago and the professor handed back the grades today. The average was 48 Low 18 High 84 my grade was 60 I'm not sure...

    Started by zin.rokh‎, 05-16-2014 02:10 AM
    • Replies: 2
    • Views: 1,397
    05-16-2014, 02:53 AM Go to last post
  29. EU Election-Can you check this article?

    Hi guys, Could someone check this for me please?...

    Started by Dodders992‎, 05-15-2014 04:14 PM
    • Replies: 3
    • Views: 1,641
    05-15-2014, 05:06 PM Go to last post
  30. Post HELP!!!!!!! completely stuck on all of these q's. help would greatly be appreciated

    .... completely stuck

    Started by ronzoz‎, 05-15-2014 01:28 PM
    • Replies: 2
    • Views: 920
    05-15-2014, 01:32 PM Go to last post
  31. Testing for differences: 2x2 between subjects design w/ additional control group

    Hi everyone, I have a 2 (involvement high / low) x 2 (high value brand / low value brand) between subjects design. Involvement and brand value are...

    Started by MeSoSerious‎, 05-07-2014 03:49 AM
    • Replies: 5
    • Views: 1,683
    05-15-2014, 09:21 AM Go to last post
  32. testing for difference between 3 sets of range data

    I work for a small charity and have been asked to write a short report based on data we have collected. I have a small amount of stats knowledge but...

    Started by NEwald‎, 05-15-2014 06:39 AM
    • Replies: 0
    • Views: 1,090
    05-15-2014, 06:39 AM Go to last post
  33. correlate two time series

    Hi there, I would like to compare the two short time series to see how similar they are, but I have no idea how to do it, but there is some...

    Started by ivn‎, 04-10-2014 03:16 PM
    • Replies: 8
    • Views: 2,259
    05-15-2014, 06:28 AM Go to last post
  34. Basic Sample Size/Power calculation

    I have a statistics question, which i've made into a basic analogy: There is a population of 300,000,000 total marbles, with some that are white...

    Started by PurityofEssence‎, 05-12-2014 10:58 AM
    • Replies: 5
    • Views: 1,330
    05-14-2014, 04:49 PM Go to last post
  35. Noob question

    Hi guys I have worked myself into a knot over this. The question is possibly too stupd for this forum. Apologies in advance! Consider the...

    Started by epistat‎, 05-13-2014 10:20 PM
    • Replies: 1
    • Views: 811
    05-14-2014, 03:13 PM Go to last post
  36. Bivariate Correlation Unique solution

    I have a set of data, let's say "score vs loss ratio", the score is an arbitrary number I gave to a team by looking at their past history. I want to...

    Started by ipandabear‎, 05-14-2014 12:28 PM
    • Replies: 0
    • Views: 852
    05-14-2014, 12:28 PM Go to last post
  37. How do you find equally likely possibilities?

    I have attached a homework problem to this post. It asks what the probability is that all 4 watches of a selection are inaccurate when the...

    Started by againanew‎, 05-14-2014 11:09 AM
    • Replies: 0
    • Views: 1,001
    05-14-2014, 11:09 AM Go to last post
  38. How to improve r2 and regression significance?

    Hi. I'm trying to find out the relationship between net profit, cash flow as independent var and stock return as dependent var. There are 186...

    Started by sevensix‎, 05-13-2014 01:31 PM
    • Replies: 3
    • Views: 3,851
    05-14-2014, 08:00 AM Go to last post
  39. 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: 881
    05-14-2014, 07:23 AM Go to last post
  40. Unhappy Simple for someone... just not me!

    Here is the question that I can't seem to figure out!!! PLEASE HELP!! I've attached the JPEG of the question. This is my last question out of about...

    Started by quadoduece‎, 05-13-2014 11:34 PM
    • Replies: 1
    • Views: 1,099
    05-14-2014, 05:21 AM Go to last post
  41. [help]interpretation needed please can please solve all parts please...

    The given model is from Merrill and fox. The data are presented (table 3.1) are presented for demand and supply of meat in the united states for...

    Started by numerospy‎, 05-13-2014 11:09 PM
    • Replies: 0
    • Views: 796
    05-13-2014, 11:09 PM Go to last post
  42. Help analysing percentage data

    Hi! I'm new to the forum, and have been trying to find an answer to an analysis problem, so far with no luck. To give some background, I have a...

    Started by beekotopia‎, 05-12-2014 11:45 PM
    • Replies: 3
    • Views: 1,420
    05-13-2014, 10:08 PM Go to last post
  43. Comparing the same independent variable in two different models.

    I have a model that describes an effect for a large sample consisting of two groups where all coefficients are significant at a 95%-level. When...

    Started by dunkdrugis‎, 05-13-2014 05:55 AM
    • Replies: 0
    • Views: 1,381
    05-13-2014, 05:55 AM Go to last post
  44. Comparing two data points against a standard

    I need some help in applying the corrrect statistical formula for data obtained from a scientific experiment. Background information: I'm testing...

    Started by Hubber‎, 05-13-2014 04:57 AM
    • Replies: 0
    • Views: 1,101
    05-13-2014, 04:57 AM Go to last post
  45. Exclamation Help with the statistics solving

    Violations 0 0 1 2 3 4 5 >5 Fine A$1000 0 0 10 10 10 20 50 (Please note from the...

    Started by alestairilupul‎, 05-13-2014 01:51 AM
    assumptions, binomial distribution, expected value, probabilities, statistics business
    • Replies: 0
    • Views: 1,456
    05-13-2014, 01:51 AM Go to last post
  46. [SOLVED] Planned comparisons in multivariated analyzes.

    Hi, there! Guys, I need some help. I can`t find any papper albout this subject. I`m running some multivariated analyzes (PERMANOVA) and I have, ...

    Started by Felipe‎, 05-12-2014 05:50 PM
    • Replies: 2
    • Views: 1,118
    05-12-2014, 06:28 PM Go to last post
  47. Need help

    I need help analyzing the following data: Temp (C) Pressure (psi) 100 200 300 10 65 75 80...

    Started by wally‎, 05-12-2014 11:31 AM
    • Replies: 2
    • Views: 1,425
    05-12-2014, 05:27 PM Go to last post
  48. significance level problem

    A teacher has 95 percent success of his students to pass his exam. From 60 students chosen at random, only 75 percent succeeded. At significance...

    Started by younghistorian‎, 05-11-2014 09:00 AM
    • Replies: 1
    • Views: 1,074
    05-12-2014, 03:20 PM Go to last post
  49. Red face Choosing the correct Statistical test

    I am writing my first year project about working conditions in Denmark and have done some statistical analysis. But I am in doubt whether I have used...

    Started by taspinar‎, 05-12-2014 11:09 AM
    help neded, problem, stata, statistical test
    • Replies: 3
    • Views: 1,380
    05-12-2014, 02:50 PM Go to last post
  50. Statistics over grouped information

    Hello All, I am working on a Quality Control Chart and I have a doubt on how to perform statistics over grouped information. The company I work...

    Started by Carlos Toloza‎, 05-12-2014 01:29 PM
    • Replies: 0
    • Views: 960
    05-12-2014, 01:29 PM Go to last post
  51. Question on state space model

    Hello, I am currently analyzing a paper on the evolution on the Union's and the Confederation's currency price in gold during the Civil War. The...

    Started by afranck‎, 05-12-2014 11:15 AM
    • Replies: 0
    • Views: 852
    05-12-2014, 11:15 AM Go to last post
  52. Difference between 1-way and 2-way Anova

    Can anyone explain the difference between a 1-way and 2-way Repeated ANOVA? I have ran both analysis on some data from a longitudinal study to find...

    Started by Geni‎, 05-12-2014 06:35 AM
    repeated anova
    • Replies: 0
    • Views: 1,949
    05-12-2014, 06:35 AM Go to last post
  53. Clustering of categorial & quantitative data

    Hello, Struggling a bit here, hope I chose the right forum place. I am trying to cluster cells (1x1km) over a specific area. Each cell is...

    Started by mahoo‎, 05-03-2014 10:31 PM
    cluster analysis
    • Replies: 3
    • Views: 1,842
    05-12-2014, 04:09 AM Go to last post
  54. Confidence Intervals around eta square and reporting effect sizes for publication

    Does anyone know how to calculate CIs around partial eta square? I have a wonderful spread sheet calculator that provides CIs for Cohen's d but...

    Started by Tanned Man‎, 05-10-2014 06:41 PM
    • Replies: 2
    • Views: 1,701
    05-11-2014, 11:36 PM Go to last post
  55. Local level kalman filter

    We have the local level model: x_t = x_{t-1}+w_t, \ t=1,...,n y_t = x_t + v_t, \ t=1,...,n with the initial value x_0 and where w_t is i.i.d....

    Started by L1meta‎, 05-11-2014 03:56 AM
    • Replies: 0
    • Views: 1,093
    05-11-2014, 03:56 AM Go to last post
  56. Running Pearson R on Indicator Variables

    Hi All, I was asked by a friend to help out on running some correlations on a survey data set that he received from a survey application. ...

    Started by mia2‎, 05-10-2014 11:17 AM
    • Replies: 0
    • Views: 1,060
    05-10-2014, 11:17 AM Go to last post
  57. difference of unequal sample size

    Hi, I am a newbie in stats :wave: . My problem: I have two columns of numerical data of unequal length, motion data. I need difference of...

    Started by kkumar‎, 05-09-2014 04:21 PM
    diff unequal sample size
    • Replies: 6
    • Views: 1,425
    05-10-2014, 11:11 AM Go to last post
  58. T-test following two-way repeated measures ANOVA

    Hi everyone, I have run a two-way repeated measures ANOVA on some data where I have two independent variables each with two levels (think this is...

    Started by Johntan32‎, 05-10-2014 01:16 AM
    • Replies: 0
    • Views: 988
    05-10-2014, 01:16 AM Go to last post
  59. Silly question about the exponential distribution

    So, a product has an expected lifetime of 50 days. So lambda is 50. The mean of lambda is 1/50, meaning that every day there is a 1/50 chance of a...

    Started by abacus‎, 05-09-2014 12:05 PM
    • Replies: 4
    • Views: 1,217
    05-09-2014, 08:36 PM Go to last post
  60. Find causal effect from two means

    Hi. I'm in a statistics class for social science majors, and after a few weeks of theoretical ideas we're finally being given some practice...

    Started by euphoniumist113‎, 05-09-2014 07:36 PM
    • Replies: 1
    • Views: 1,486
    05-09-2014, 08:22 PM Go to last post

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