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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Ordinal Logistic Regression and Bimodality

    Hello, I'm running ordinal logistic regressions with survey weights. I was under the impression that there are no distributional assumptions for...

    Started by trafalgar‎, 07-24-2009 01:28 PM
    • Replies: 0
    • Views: 4,340
    07-24-2009, 01:28 PM Go to last post
  2. Simple Linear Regression with GUM Uncertainties

    I would appreciate it if someone could suggest some references that discuss how to formally incorporate measurement uncertainties (as calculated per...

    Started by Tom La Bone‎, 07-23-2009 04:31 PM
    • Replies: 0
    • Views: 4,300
    07-23-2009, 04:31 PM Go to last post
  3. Please explain differences between R and r

    Hello, I received my dissertation back with comments from the dean. He flagged the following text and added the following comments: Am I...

    Started by lph2005‎, 07-17-2009 11:48 PM
    • Replies: 0
    • Views: 8,244
    07-17-2009, 11:48 PM Go to last post
  4. Logistic regression vs multiple regression

    I have a 3 predictor variables that I am using to predict participation rates. How do I determine whether to use logistic regression or multiple...

    Started by Cohen's monkey‎, 07-15-2009 06:20 PM
    • Replies: 1
    • Views: 6,319
    07-15-2009, 07:54 PM Go to last post
  5. Factorial ANOVA

    I am not sure if what i am about to ask would make complete sense so let me start from the beginning. I'm doing research to measure five different...

    Started by jaanus_lallu‎, 07-11-2009 06:11 PM
    • Replies: 2
    • Views: 3,024
    07-15-2009, 06:49 AM Go to last post
  6. Web Analyst: Been a While Since I Touched Stats

    Hey everyone, I joined up to this site looking to get some advice. I have been doing web analytics for just over 2 years now. I have an...

    Started by JTWood‎, 07-06-2009 11:03 PM
    • Replies: 5
    • Views: 2,692
    07-08-2009, 08:23 PM Go to last post
  7. Attempting the Impossible? Please help!

    I've been tasked with conducting a statistical analysis and have encountered a few potentially significant problems. As its been quite some time...

    Started by carriedinterest‎, 07-07-2009 08:21 AM
    • Replies: 0
    • Views: 2,393
    07-07-2009, 08:21 AM Go to last post
  8. what is the best model to use?

    I have been working on this project for over 4 months. My model was approved by supervisor. The model was to run a multinomial logistic regression to...

    Started by squidly‎, 07-04-2009 09:18 AM
    • Replies: 1
    • Views: 1,972
    07-05-2009, 11:40 AM Go to last post
  9. Best laid plans...

    My thesis design was to give participants 2 tests. One measures a personal "type" and the other asks "opinions". My manipulation was to reverse...

    Started by Roadguru‎, 05-28-2009 10:21 PM
    • Replies: 12
    • Views: 3,543
    06-24-2009, 04:04 PM Go to last post
  10. Multiple chi-square or logistic regression?

    Hi, I'm new to statistics and am working on a project for work. I have read extensively and believe I am on the correct path, but would like to...

    Started by Chris Webber‎, 06-22-2009 08:54 AM
    • Replies: 1
    • Views: 6,627
    06-22-2009, 07:36 PM Go to last post
  11. variance-stabilizing transformation for simple linear regression

    studying for a test.. need some help. Consider a simple linear regression analysis with β0 and β1 both positive. Suppose that the mean of the...

    Started by hanelliot‎, 06-21-2009 12:07 PM
    • Replies: 1
    • Views: 3,896
    06-21-2009, 06:43 PM Go to last post
  12. Regression SS in multiple linear regression

    In MULTIPLE linear regression, is it still true that the regression sum of squares is equal to ∑ (Y_i hat -Y bar)^2 ??? My textbook defines...

    Started by kingwinner‎, 06-20-2009 07:04 AM
    • Replies: 3
    • Views: 5,532
    06-20-2009, 04:55 PM Go to last post
  13. Multiple linear regression: partial F-test

    "Suppose that in a MULTIPLE linear regression analysis, it is of interest to compare a model with 3 independent variables to a model with the same...

    Started by kingwinner‎, 06-18-2009 08:58 PM
    • Replies: 5
    • Views: 20,538
    06-20-2009, 11:32 AM Go to last post
  14. Sum of the residuals in multiple linear regression

    In my textbook, the following results are proved in the context of SIMPLE linear regression: ∑e_i = 0 ∑(e_i)(Y_i hat)= 0 I tried to modify the...

    Started by kingwinner‎, 06-20-2009 07:09 AM
    • Replies: 1
    • Views: 7,386
    06-20-2009, 07:28 AM Go to last post
  15. Cov in multiple linear regression

    For multiple linear regression model Y = Xβ + e, assume X is non-random. Assume Gauss-Markov assumptions hold. Show that variance-covariance matrix...

    Started by hanelliot‎, 06-19-2009 08:35 PM
    • Replies: 3
    • Views: 5,310
    06-19-2009, 09:32 PM Go to last post
  16. Poisson regression

    Hello, Is it possible to do a Poisson regression with only 6 observations? What is the minimum number of observations possible? Giovanna

    Started by Giovanna‎, 06-18-2009 05:48 AM
    • Replies: 0
    • Views: 3,387
    06-18-2009, 05:48 AM Go to last post
  17. Did I do this correctly?

    Hi, I am trying to forecast electric power demand for natural gas in the near future. A huge driver of electric power demand for natural gas on a...

    Started by naturallight‎, 06-12-2009 06:08 PM
    • Replies: 5
    • Views: 3,009
    06-15-2009, 07:01 PM Go to last post
  18. 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: 1,676
    06-07-2009, 04:35 PM Go to last post
  19. 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: 12,309
    06-04-2009, 08:24 PM Go to last post
  20. 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: 1,948
    06-03-2009, 06:06 PM Go to last post
  21. 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: 2,828
    05-30-2009, 09:55 PM Go to last post
  22. 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: 16,539
    05-27-2009, 10:39 AM Go to last post
  23. 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: 4,451
    05-22-2009, 03:35 PM Go to last post
  24. 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: 2,596
    05-20-2009, 07:31 AM Go to last post
  25. 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: 3,195
    05-19-2009, 08:03 PM Go to last post
  26. 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: 2,595
    05-19-2009, 08:02 PM Go to last post
  27. 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: 14,209
    05-07-2009, 01:50 AM Go to last post
  28. 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: 2,318
    05-06-2009, 01:31 AM Go to last post
  29. 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: 3,852
    05-05-2009, 04:53 PM Go to last post
  30. 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: 2,870
    05-03-2009, 06:02 PM Go to last post
  31. 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: 3,331
    05-03-2009, 06:01 PM Go to last post
  32. 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: 2,524
    04-29-2009, 09:36 PM Go to last post
  33. 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: 2,797
    04-18-2009, 07:21 PM Go to last post
  34. 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: 3,936
    04-18-2009, 03:47 AM Go to last post
  35. 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: 2,489
    04-13-2009, 01:22 AM Go to last post
  36. 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: 2,644
    04-10-2009, 02:39 AM Go to last post
  37. 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: 2,965
    04-01-2009, 07:24 AM Go to last post
  38. 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: 2,234
    03-30-2009, 11:58 AM Go to last post
  39. 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: 4,274
    03-25-2009, 07:42 PM Go to last post
  40. 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: 5,635
    03-22-2009, 12:39 PM Go to last post
  41. 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: 2,718
    03-21-2009, 07:30 AM Go to last post
  42. 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: 21,896
    03-20-2009, 11:49 PM Go to last post
  43. 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: 2,181
    03-20-2009, 07:33 PM Go to last post
  44. 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: 3,678
    03-12-2009, 05:47 PM Go to last post
  45. 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: 2,528
    03-10-2009, 07:51 AM Go to last post
  46. 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: 11,788
    03-03-2009, 05:06 PM Go to last post
  47. 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: 5,874
    03-01-2009, 09:28 PM Go to last post
  48. 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: 4,746
    02-26-2009, 11:57 AM Go to last post
  49. 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: 3,027
    02-24-2009, 05:50 AM Go to last post
  50. 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: 4,452
    02-18-2009, 10:19 PM Go to last post
  51. 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: 4,537
    02-16-2009, 08:43 PM Go to last post
  52. 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: 2,057
    02-15-2009, 03:35 PM Go to last post
  53. 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: 3,252
    02-13-2009, 02:12 AM Go to last post
  54. 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: 3,539
    02-09-2009, 01:00 PM Go to last post
  55. 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: 3,706
    02-08-2009, 11:31 AM Go to last post
  56. 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: 2,796
    02-01-2009, 10:04 AM Go to last post
  57. 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: 2,406
    01-28-2009, 03:13 PM Go to last post
  58. "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: 3,920
    01-22-2009, 03:05 PM Go to last post
  59. 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: 3,101
    01-20-2009, 06:33 AM Go to last post
  60. 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: 5,500
    01-15-2009, 08:43 AM Go to last post

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