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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Regression Help

    OK, attached is the regression problem. It has multiple items to calculate. My problem is I am not sure if I calculated #1 and #2 correctly in...

    Started by TEE323‎, 06-07-2009 04:35 PM
    • Replies: 0
    • Views: 1,214
    06-07-2009, 04:35 PM Go to last post
  2. linear regression model: LSE, Var, Cov etc

    Studying for a test.. can anyone check my solutions for (a)-(c) and give me any help on (d)? Any help would be appreciated. Consider the model Yi...

    Started by hanelliot‎, 06-03-2009 02:42 PM
    • Replies: 2
    • Views: 10,481
    06-04-2009, 08:24 PM Go to last post
  3. Help Please.

    Suppose that you wish to use a linear regression to predict the dependent variable Y using the dependent variable X1. You collect a scatter plot of...

    Started by btnh33‎, 06-03-2009 06:06 PM
    • Replies: 0
    • Views: 1,319
    06-03-2009, 06:06 PM Go to last post
  4. hierarchical multiple regression

    Hi guys, I'm pretty clueless when it comes to stats, so I was wondering if you could help. I'm testing 2 competing theories on personality causes...

    Started by tori‎, 05-30-2009 09:55 PM
    • Replies: 0
    • Views: 2,173
    05-30-2009, 09:55 PM Go to last post
  5. Linear Regression: reversing the roles of X and Y

    Simple linear regression: Y = β0 + β1 *X + ε , where ε is random error Fitted (predicted) value of Y for each X is: ^ Y = b0 + b1 *X (e.g....

    Started by kingwinner‎, 05-25-2009 03:23 AM
    • Replies: 4
    • Views: 14,617
    05-27-2009, 10:39 AM Go to last post
  6. Linear Regression Models (2)

    β ε note: also under discussion in "Math Help Forum"

    Started by kingwinner‎, 05-14-2009 04:40 AM
    • Replies: 12
    • Views: 3,659
    05-22-2009, 03:35 PM Go to last post
  7. MLE problem, linear regression model

    Hey, im having trouble studying for an upcoming exam... the attached question is coming up a lot in recent exams and haven't got a solution for it...

    Started by qwertykeyboards‎, 05-20-2009 07:22 AM
    • Replies: 1
    • Views: 2,104
    05-20-2009, 07:31 AM Go to last post
  8. Linear Regression Models (3)

    β ε note: also under discussion in "Math Help Forum"

    Started by kingwinner‎, 05-14-2009 04:43 AM
    • Replies: 4
    • Views: 2,322
    05-19-2009, 08:03 PM Go to last post
  9. Linear Regression Models (1)

    1) "In regression models, there are two types of variables: X = independent variable Y = dependent variable Y is modeled as random. X is...

    Started by kingwinner‎, 05-14-2009 04:36 AM
    • Replies: 1
    • Views: 1,771
    05-19-2009, 08:02 PM Go to last post
  10. Interpreting a moderation effect

    Yesterday I submitted my firts thread but I learnt that it was too vague. I did my work but now I have some doubts interpreting a moderation effect....

    Started by Mariana Ramos‎, 04-29-2009 11:37 AM
    • Replies: 3
    • Views: 12,218
    05-07-2009, 01:50 AM Go to last post
  11. Validity of setting constant to zero

    Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? For example, I have been...

    Started by craigpollard‎, 05-06-2009 01:31 AM
    • Replies: 0
    • Views: 1,641
    05-06-2009, 01:31 AM Go to last post
  12. Poisson regression with interactions

    I am investigating the risk of getting different forms of leukemia if you live near a hazardous waste site in New York state. I am working with PROC...

    Started by bobban‎, 05-05-2009 04:53 PM
    • Replies: 0
    • Views: 2,846
    05-05-2009, 04:53 PM Go to last post
  13. Independent variable kurtosis in multiple regression...

    One of my independent variables 'Age' has 10 categories of ages, each with an equal number of individuals. What do I need to do to this to make it...

    Started by Labtec‎, 05-03-2009 11:35 AM
    • Replies: 1
    • Views: 2,167
    05-03-2009, 06:02 PM Go to last post
  14. Dependent variable kurtosis

    How important is it for the Dependent Variable in a multiple regression to show normal distribution? I have read apparently contradictory...

    Started by Labtec‎, 05-03-2009 07:22 AM
    • Replies: 2
    • Views: 2,539
    05-03-2009, 06:01 PM Go to last post
  15. Linear Regression Model Help

    Hi, I don't really understand how I go about this problem. I understand regression but I need a little help here. Question: Reaction time to a...

    Started by alan4cult‎, 03-06-2009 05:51 PM
    • Replies: 2
    • Views: 1,704
    04-29-2009, 09:36 PM Go to last post
  16. Urgent help, please...thanks . A.S.A.P

    Thanks admin for your ongoing feedback... I am facing this problem with the Leckert Scale...follows: data set to be collected - 5 points:...

    Started by alicccccc‎, 11-12-2008 10:01 PM
    • Replies: 3
    • Views: 2,062
    04-18-2009, 07:21 PM Go to last post
  17. PCA questions

    here goes... 1. The Kaiser-Meyer-Olkin Measure of Sampling Adequacy and Bartlett's Test of Sphericity tests are done on the standardised or the...

    Started by madhatter‎, 04-18-2009 03:47 AM
    • Replies: 0
    • Views: 2,882
    04-18-2009, 03:47 AM Go to last post
  18. Multiple Regression where DV is a proportion

    Hi. I am using multiple regression with 3 continuous predictor Variables, and the Dependent Variables is a proportion (0-1). I'm worrying quite a...

    Started by TheConglomerate‎, 04-13-2009 01:22 AM
    • Replies: 0
    • Views: 1,746
    04-13-2009, 01:22 AM Go to last post
  19. Thumbs down Linear Regression and Correlation Q - Need help!

    Home Size Selling Price Home Size Selling Price 1.4 100 1.3 110 1.3 110 ...

    Started by rochestergirlny‎, 04-09-2009 11:48 PM
    • Replies: 1
    • Views: 1,874
    04-10-2009, 02:39 AM Go to last post
  20. SPSS multiple regression????

    I want to do a multiple regression , correlating offspring produced on mating one with offspring produced on mating two also with male age at the...

    Started by marigold‎, 04-01-2009 07:24 AM
    • Replies: 0
    • Views: 2,217
    04-01-2009, 07:24 AM Go to last post
  21. Simple Questions

    ...and yet i'm stuck. 1) How would you represent the components of ANOVA of regression in a graphic format,when considering a bivariate...

    Started by jamesmartinn‎, 03-30-2009 11:58 AM
    • Replies: 0
    • Views: 1,535
    03-30-2009, 11:58 AM Go to last post
  22. Transformed Interactions in Regression

    Hi all, I have a quick (but surprisingly difficult) question to ask regarding transformed variables in an interaction term when conducting...

    Started by mandy_a41‎, 03-24-2009 10:33 PM
    • Replies: 3
    • Views: 3,005
    03-25-2009, 07:42 PM Go to last post
  23. Confidence Interval for Prediction in Weighted Regression

    Hi everyone, I'm currently writing my final year project in analytical chemistry, and have got to the stage of calculating confidence intervals...

    Started by skyllberg‎, 03-22-2009 12:39 PM
    • Replies: 0
    • Views: 3,970
    03-22-2009, 12:39 PM Go to last post
  24. Prediction interval behaviour close to the origin

    Hi I have a simple linear regression model, for which I have calculated the Confidence and Prediction Intervals. The model is fixed at the origin...

    Started by cyberbunny‎, 03-21-2009 07:30 AM
    • Replies: 0
    • Views: 2,071
    03-21-2009, 07:30 AM Go to last post
  25. Three way interactions in regression

    Hi, I'm trying to figure out how to do three-way interactions with multiple regression. I am trying to predict an IV by a three DVs and the...

    Started by sifar16‎, 08-28-2008 03:18 AM
    • Replies: 4
    • Views: 19,422
    03-20-2009, 11:49 PM Go to last post
  26. Weird interaction results - need someone's help!

    I ran some hierachical multiple regression in SPSS, and plotted my significant interactions (I have all continuous predictors and outcomes). One of...

    Started by asugrad‎, 03-20-2009 07:33 PM
    • Replies: 0
    • Views: 1,571
    03-20-2009, 07:33 PM Go to last post
  27. Question Regression for nominal variables?

    well, i'm interested if there is some kind of procedure, similar to multiple regression to calculate results for nominal variable with more than two...

    Started by Franz Dobermann‎, 03-10-2009 08:36 AM
    • Replies: 1
    • Views: 2,613
    03-12-2009, 05:47 PM Go to last post
  28. Adjusting survey data that is taken at diffrent timepoints

    Hi all, I am trying to analyze the differences between two groups in the result of a psychometric survey after they have been affected by a...

    Started by ilike‎, 03-09-2009 07:16 AM
    • Replies: 2
    • Views: 1,814
    03-10-2009, 07:51 AM Go to last post
  29. multiple regression - beta coefficient - beta above 1

    Hey, I have a problem concerning multiple regression analyses and the beta coefficient. I conducted a multiple regression analysis with two...

    Started by Torsten‎, 03-03-2009 10:22 AM
    • Replies: 1
    • Views: 9,389
    03-03-2009, 05:06 PM Go to last post
  30. Double check sample calculation from pilot study

    I am really a neophyte to statistics but am in the middle of a research project and would appreciate someone checking my calculations. I ran a...

    Started by lph2005‎, 02-23-2009 01:35 AM
    • Replies: 3
    • Views: 4,121
    03-01-2009, 09:28 PM Go to last post
  31. Linear Regression in Excel...

    Hello everyone ! If you don't mind, a question regarding linear regression in Excel. I will be having a an Intro to Statistics test in May and...

    Started by Fred‎, 02-26-2009 11:08 AM
    • Replies: 4
    • Views: 3,899
    02-26-2009, 11:57 AM Go to last post
  32. pearson correlation in linear mixed models?

    Hi, I'm trying to understand a research article that used linear mixed models, and I think they have done something wrong. Basically, the...

    Started by williaml‎, 02-24-2009 05:50 AM
    • Replies: 0
    • Views: 2,433
    02-24-2009, 05:50 AM Go to last post
  33. This simple linear regression isn't adding up..

    Edit/Cliffnotes: CORRECTION- The second SSR formula in question is SSR = SUM((yhat(i) - ybar)^2), not SSR = SUM((y(i) - ybar)^2). Dragan resolved my...

    Started by Math Adventures‎, 02-18-2009 08:40 PM
    • Replies: 2
    • Views: 3,145
    02-18-2009, 10:19 PM Go to last post
  34. three way interactions and centering in multiple regression

    Hello, I am examining three variables to see whether they interact with each other to predict my DV using multiple regression. I typically center my...

    Started by psychologygirl‎, 02-14-2009 10:07 PM
    • Replies: 4
    • Views: 3,475
    02-16-2009, 08:43 PM Go to last post
  35. Question About a Seemingly Invalid Sampling

    Hi, I was wondering if someone can help me with the following question: Suppose that we were interested in the effects of a prep course on SAT...

    Started by snipez‎, 02-15-2009 03:30 AM
    • Replies: 1
    • Views: 1,440
    02-15-2009, 03:35 PM Go to last post
  36. multiple comparisons

    Hi, I'm a vet doing a research project, but am not really strong in stats. I have a question about whether correction for multiple comparisons is...

    Started by jknuppel‎, 02-09-2009 09:13 PM
    • Replies: 8
    • Views: 2,519
    02-13-2009, 02:12 AM Go to last post
  37. Percentage/proportion prediction interval

    Hi, anyone could help with this: we know that with a considerably large sample we can estimate what is the proportion of cases having a certain...

    Started by Johngr55‎, 02-09-2009 12:38 PM
    • Replies: 1
    • Views: 2,563
    02-09-2009, 01:00 PM Go to last post
  38. Comparing regression equations

    I am thinking of trying to use the logit model to determine the probability of whether patients will participate in a particular health program. My...

    Started by Clouds1988‎, 02-07-2009 07:35 PM
    • Replies: 2
    • Views: 2,571
    02-08-2009, 11:31 AM Go to last post
  39. Linear Regression Models

    I am being asksed if an equation is linear in the paramenters or variables and I am a bit lost. I understand that for something to be linear it cant...

    Started by ajmax01‎, 02-01-2009 12:19 AM
    • Replies: 1
    • Views: 1,889
    02-01-2009, 10:04 AM Go to last post
  40. Risk Model Re-Weighting Help Needed

    Long story somewhat short My company uses a risk model with 10+ variables. Each of these variables is weighted according to the risk it...

    Started by Forty6ixAnd2‎, 01-19-2009 08:52 PM
    • Replies: 2
    • Views: 1,845
    01-28-2009, 03:13 PM Go to last post
  41. "Best" Multiple (Multivariate) Nonlinear Regression?

    Hi all, I'm just getting started in R. I've had good luck finding the right (predictive) correlation weights using orthogonal polynomials in Java....

    Started by Axl‎, 01-21-2009 05:58 PM
    • Replies: 2
    • Views: 3,072
    01-22-2009, 03:05 PM Go to last post
  42. Stats analysis help would be very much appreciated

    I have carried out some research. The research involved respondents filling in a questionnaire of 62 questions. Answers were on a scale - Strongly...

    Started by oakmoss‎, 01-18-2009 09:32 AM
    • Replies: 4
    • Views: 2,281
    01-20-2009, 06:33 AM Go to last post
  43. Logistic regression or DFA?

    Hi! I am trying to get my masters thesis done. I am taking a statistics course right now, but I need to get started on things sooner rather than...

    Started by Merlion‎, 01-14-2009 10:52 PM
    • Replies: 3
    • Views: 4,578
    01-15-2009, 08:43 AM Go to last post
  44. Unbalanced Sample Sizes

    Given two variables: one is a single estimate measured on one individual, the other is comprised of multiple samples taken from the same individuals...

    Started by scoter‎, 01-12-2009 05:06 PM
    • Replies: 0
    • Views: 2,199
    01-12-2009, 05:06 PM Go to last post
  45. Statistical Significance

    I am completing a statistics project having been given data for 30 years. I have calculated the pairwise correlation coefficients between Infant...

    Started by shanny9‎, 01-04-2009 07:22 AM
    • Replies: 2
    • Views: 2,205
    01-04-2009, 03:42 PM Go to last post
  46. Unhappy multiple regression analysis on likertscale

    Dear All, I am doing the analysis of my data obtained through a questionaire. i want to find the relationship of different forms justice...

    Started by Mobushir riaz Khan‎, 12-22-2008 10:18 AM
    • Replies: 1
    • Views: 1,680
    12-24-2008, 07:46 AM Go to last post
  47. Linear regression

    Hi all I was given a data sample of 35 countries which included the country name,the number of railways and the number of airports in the given...

    Started by gloew‎, 12-19-2008 04:44 AM
    • Replies: 6
    • Views: 2,418
    12-23-2008, 06:09 PM Go to last post
  48. Multiple logistic Regression Power Analysis

    Hi to everybody, Please does anybody can help me to solve this problem? I have a multiple logistic regression model with more than one BINARY...

    Started by Canyon75‎, 12-20-2008 08:05 AM
    • Replies: 1
    • Views: 3,735
    12-22-2008, 09:04 AM Go to last post
  49. Hlm?

    I am working with a large data set, n = 1200+ average course grades culled from over 15,000 students from a school. I ran a regression using average...

    Started by ewblack‎, 12-09-2008 01:23 PM
    • Replies: 9
    • Views: 3,819
    12-17-2008, 12:21 PM Go to last post
  50. Binary Logistic Regression in R

    Warning: this is going to be a long post. Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road. This...

    Started by jerh‎, 12-04-2008 11:10 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 19,864
    12-16-2008, 03:21 AM Go to last post
  51. adjusting a proportion score (controling for age)

    I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

    Started by chinaplate‎, 12-15-2008 10:19 PM
    • Replies: 8
    • Views: 3,330
    12-15-2008, 11:23 PM Go to last post
  52. ANOVA confusions- Please Help

    Hello, I was wondering if you could please offer any advice as I appear to have got rather muddled. I am writing a resesarch proposal, and I...

    Started by GuineaPig‎, 12-09-2008 03:35 PM
    • Replies: 8
    • Views: 2,280
    12-10-2008, 11:14 PM Go to last post
  53. Can you guys check these for me

    Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

    Started by Bicano‎, 12-08-2008 11:07 AM
    • Replies: 1
    • Views: 4,147
    12-08-2008, 03:33 PM Go to last post
  54. Question Multiple Regression & Multiple Linear Regression: 2 Qu's

    I know these are 2 very basic question, but if someone could please confirm them for me I'd be very grateful indeed: 1. Am I correct in thinking...

    Started by gemma7‎, 08-31-2008 08:49 AM
    • Replies: 4
    • Views: 10,194
    12-05-2008, 03:40 PM Go to last post
  55. price determination prediction

    Its been 2 years since my last statistics class. I did fairly well but the material isn't so fresh since I haven't had to use it. I am writting a...

    Started by mikeo1313‎, 12-01-2008 02:56 AM
    • Replies: 1
    • Views: 1,587
    12-01-2008, 03:14 AM Go to last post
  56. Did i get theese right i am confused, can anyone help me please

    25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

    Started by Bicano‎, 11-30-2008 08:26 PM
    • Replies: 2
    • Views: 19,918
    11-30-2008, 09:08 PM Go to last post
  57. Testing for difference 2 regression models

    Hello, I am working on multiple regressions at the moment and have come to a point that I need a little assistance. I have the following question:...

    Started by devreede‎, 11-28-2008 12:16 PM
    • Replies: 8
    • Views: 23,346
    11-29-2008, 11:29 AM Go to last post
  58. Looking for mult. linear regression equations

    Hi - I'm having trouble finding the equations for the coefficients for a multiple linear regression with two independent variables (a=, b1=, b2=). ...

    Started by dave25‎, 11-26-2008 07:28 PM
    • Replies: 1
    • Views: 2,079
    11-26-2008, 08:13 PM Go to last post
  59. Cool Multiple Regression with Multiple Groups

    Hello, I am looking at predictor variables (scores on partner perception measures) on a criterion variable (relationship satisfaction), in order to...

    Started by Shadow3758‎, 11-26-2008 05:35 PM
    • Replies: 9
    • Views: 4,255
    11-26-2008, 06:58 PM Go to last post
  60. Independent variables correlate to each other: violation of regression assumoptions?

    Ok, so bear with me - total statistical idiot here, in way over his head. I'm running multiple regressions of plant cover against precipitation,...

    Started by Charlie‎, 11-13-2008 03:37 PM
    • Replies: 11
    • Views: 12,292
    11-19-2008, 10:17 AM Go to last post

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