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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Firth regression and AIC-based model selection

    Dear all, when using Firth's bias reduction method (Firth 1993) to fit logistic regressions, is it possible (sensible) to compare models using AIC? ...

    Started by Luke‎, 09-01-2017 08:04 AM
    aic, firth regression
    • Replies: 4
    • Views: 347
    09-01-2017, 03:41 PM Go to last post
  2. Hierarchical Linear Modeling (HLM) Assistance

    Sorry if this gets posted twice (it doesn't look like it has posted the first time as of now). I asked a question about fixed vs. random effects...

    Started by Weibull‎, 09-27-2017 10:26 AM
    • Replies: 4
    • Views: 239
    09-28-2017, 04:40 AM Go to last post
  3. Stationarity and White noise

    Hi all, I'm just beginning to learn about time series analysis for my final year project at uni and I am confused about stationarity. A time series...

    Started by zeke512‎, 10-02-2017 10:57 AM
    • Replies: 4
    • Views: 210
    10-03-2017, 04:53 AM Go to last post
  4. Converting a continuous variable into a categorical variable (low, medium, high)

    I have a continuous dependent variable (scores on an exam) and a number of predictor variables that I'd like to use in a regression analysis, such as...

    Started by tess2‎, Yesterday 12:08 AM
    categorical, percentiles, regression
    • Replies: 4
    • Views: 114
    Yesterday, 10:43 AM Go to last post
  5. Improving an estimate of a mean value

    Hello, I have a dataset that has 10 independent descriptors and one dependent statistic, b. Only a few of the descriptors are quantitative and...

    Started by FailedStats101‎, 02-28-2006 08:19 AM
    • Replies: 3
    • Views: 3,154
    02-28-2006, 11:35 PM Go to last post
  6. Question Need help on deciding the analysis tests

    Hello every one, I am doing research in social science. i have following issue for which I need advise: 1. My sample is a snowball sample and...

    Started by amjadyunus‎, 03-09-2006 03:44 PM
    • Replies: 3
    • Views: 2,892
    03-16-2006, 08:43 AM Go to last post
  7. Red face Combining Regressions

    Hi, I have several different regressions for various sites within an area estimating Y from X. I would like to combine all these sites in to...

    Started by danboyk‎, 12-19-2007 10:01 AM
    • Replies: 3
    • Views: 7,586
    12-28-2007, 11:31 AM Go to last post
  8. Do I need to treat all variables in the same way when I transform values?

    Hi, I want to carry out a Pearsons correlation to look relationships between methane flux from soil under different plantation treatments (i.e...

    Started by froglett‎, 02-16-2008 08:24 AM
    • Replies: 3
    • Views: 6,458
    02-17-2008, 02:13 PM Go to last post
  9. Another question re: correlation and regression

    I seem to be getting confused between correlation and regression a bit... I'm trying to identify the relationship between a series of X variables...

    Started by arikel‎, 03-19-2008 01:25 PM
    • Replies: 3
    • Views: 2,472
    03-20-2008, 11:38 AM Go to last post
  10. Dummy Variables and Multiple Regression

    Hi, if someone could make this clear for me, would be much appreciated.. Is it possible to create a dummy variable for more than one outcome. ...

    Started by janeduluth‎, 03-20-2008 11:50 AM
    • Replies: 3
    • Views: 6,249
    03-20-2008, 03:09 PM Go to last post
  11. Partial R squares

    Is there a way to generate partial r-squares (automatically) in multiple regression? Assume a Model Y=X1 X2 X3. GLM produces estimates of R square...

    Started by evm‎, 03-25-2008 12:06 PM
    • Replies: 3
    • Views: 8,567
    03-25-2008, 03:58 PM Go to last post
  12. multiple comparisons with multiple regressions?

    Hi there, I'm hoping that someone can answer my query or point me in the direction of a reliable source to find out more. My question is - Is the...

    Started by meema‎, 05-26-2008 09:23 AM
    • Replies: 3
    • Views: 3,339
    05-27-2008, 08:36 AM Go to last post
  13. very basis question

    Hi guys, one very basic question: what is the actual difference between simple linear regression and univariate analysis? examples would be...

    Started by nelson‎, 08-31-2008 11:57 AM
    • Replies: 3
    • Views: 2,989
    09-01-2008, 08:25 AM Go to last post
  14. Help!

    Hi, I'm in the social sciences (psych) using cross sectional data. I'm completing a multiple hierarchical regression looking at interaction...

    Started by statishtics‎, 10-15-2008 05:12 PM
    • Replies: 3
    • Views: 2,157
    10-16-2008, 07:49 AM Go to last post
  15. Factor analysis with non-normal distribution?

    Hi all, Does anyone know an alternative to factor anlysis for non-normal distrbutions which explores factors or clusters on a set of 64...

    Started by Wiggy‎, 11-06-2008 05:59 AM
    • Replies: 3
    • Views: 16,286
    11-06-2008, 02:26 PM Go to last post
  16. Calculations for the unstandardized coefficients for a multiple regression analysis

    I am looking to write a spreadsheet of the calculations for the unstandardized coefficients for a multiple regression analysis (the B values). ...

    Started by Baggies‎, 11-10-2008 03:54 AM
    • Replies: 3
    • Views: 18,899
    11-11-2008, 04:53 AM Go to last post
  17. 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: 2,816
    04-18-2009, 07:21 PM Go to last post
  18. 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: 5,508
    01-15-2009, 08:43 AM Go to last post
  19. 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: 5,904
    03-01-2009, 09:28 PM Go to last post
  20. 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: 4,286
    03-25-2009, 07:42 PM Go to last post
  21. 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: 14,230
    05-07-2009, 01:50 AM Go to last post
  22. 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: 5,545
    06-20-2009, 04:55 PM Go to last post
  23. 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: 5,332
    06-19-2009, 09:32 PM Go to last post
  24. Which test to use?

    I have just learned that I chose the wrong test for my data and I am now at a total loss. Basically I sent out a questionnaire which had a likert...

    Started by 2461c‎, 07-28-2009 10:31 AM
    • Replies: 3
    • Views: 2,344
    08-01-2009, 02:44 AM Go to last post
  25. Post ANCOVA controversy?

    Hello all, I have a question regarding ANCOVA, which seems straightforward, however an answer has eluded me. The question is: Can a...

    Started by jhdc‎, 10-31-2009 04:43 PM
    • Replies: 3
    • Views: 12,062
    11-03-2009, 08:30 PM Go to last post
  26. Exclamation Problem interpreting Multiple Regression on Video Game Sales

    Hi everyone, I am a new member, I am so glad to have found the forum. I'm tearing my hair out about this problem. These are my results: ...

    Started by aplfalcon‎, 11-09-2009 10:17 PM
    • Replies: 3
    • Views: 5,257
    11-11-2009, 04:28 PM Go to last post
  27. Teaching multivariate statistics: text & software recommendations

    Hello all, I'll be leading an introductory seminar to multivariate statistics in the spring and was looking for recommendations for texts that...

    Started by jwallin‎, 12-06-2009 07:20 PM
    • Replies: 3
    • Views: 4,370
    12-08-2009, 09:54 AM Go to last post
  28. NEED HELP on degrees of freedom!!!! URGENT

    Hello! I have finished my regression project and am writing my paper for a multiple regression model, but cannot seem to find in notes or online...

    Started by dshan‎, 12-15-2009 05:18 PM
    • Replies: 3
    • Views: 2,432
    12-15-2009, 06:17 PM Go to last post
  29. Arrow Multiple Linear Regression: How to Calculate the Coefficient

    This post has been deleted.

    Started by Draze‎, 02-02-2010 08:56 AM
    • Replies: 3
    • Views: 16,148
    02-08-2010, 12:03 PM Go to last post
  30. Help with Regression Interpretation

    Hi - Thanks in advance for any help or advice on this! I know very little about statistics, but I have performed a multiple regression analysis in...

    Started by mchel_27‎, 03-09-2010 03:30 PM
    • Replies: 3
    • Views: 4,596
    03-11-2010, 08:57 AM Go to last post
  31. Need help with question

    Hye there.I'm new here and joined because needed help with some stats problems.I need help with a problem given below S= 183+0.4122Yi-5926Gi...

    Started by new2stats‎, 04-12-2010 12:03 PM
    • Replies: 3
    • Views: 2,417
    04-12-2010, 04:13 PM Go to last post
  32. How to test INTERACTION

    HI THERE, I have started recently using the multiple regression, I am runing now a model where I have 2 continous independent variables, and 4...

    Started by Avatar‎, 05-14-2010 05:28 PM
    • Replies: 3
    • Views: 3,527
    05-15-2010, 09:22 PM Go to last post
  33. Regression brain teaser

    I have data for 100 farm ponds. I have data for 4 variables: pollution in the pond, number of cows that graze near the pond, number of pigs that...

    Started by Lake scientist‎, 06-01-2010 03:26 PM
    • Replies: 3
    • Views: 4,028
    06-03-2010, 07:41 PM Go to last post
  34. Additive regression question

    Currently, I'm trying to create a regression equation that can help my boss predict employee hours for the upcoming month. Basically, if we already...

    Started by treystasio‎, 06-21-2010 08:31 PM
    • Replies: 3
    • Views: 2,916
    06-25-2010, 01:54 PM Go to last post
  35. Degrees of Freedom in case of multiple regression?

    What does dof of each predictor show in case of multiple regression? Instead of explaining mathematically, could anyone explain the physical...

    Started by convivial‎, 07-19-2010 06:41 AM
    • Replies: 3
    • Views: 4,380
    07-19-2010, 10:21 AM Go to last post
  36. negative AIC ?

    Hello, I ran model selection by delta AIC but encountered most of the AIC as negative. (R package AICcmodavg and stat : AIC) As reviewed by...

    Started by helenekuo‎, 07-28-2010 06:21 PM
    • Replies: 3
    • Views: 11,151
    08-03-2010, 12:03 PM Go to last post
  37. What to do when the continuous dependent variable is zero more than 50% of the time

    That's basically the question - What to do when the continuous dependent variable is zero more than 50% of the time? Are there alternatives to...

    Started by steven.balsam‎, 08-01-2010 03:30 PM
    • Replies: 3
    • Views: 5,031
    08-03-2010, 04:06 PM Go to last post
  38. Review Methodology

    Hello, I'm about to embark on some mutivariate regression analysis for my company but it's been a while since I've used these methods. The outputs...

    Started by osknows‎, 08-18-2010 04:10 PM
    • Replies: 3
    • Views: 2,975
    08-18-2010, 04:39 PM Go to last post
  39. Ordinal Regression: Test of Parallel Lines

    Hi, I am trying to fit a model by using ordinal regression. I have got two co-variates, and one factor with four groups. The dependent variable...

    Started by Lotte‎, 08-26-2010 07:06 PM
    • Replies: 3
    • Views: 8,229
    08-27-2010, 09:47 PM Go to last post
  40. standardizing residuals

    Hi All, I'd like to standardize residuals. Can anybody tell me the formula to standardize to mean 0 and standard deviation 1? I also do not...

    Started by cincan‎, 09-09-2010 04:05 PM
    • Replies: 3
    • Views: 5,549
    09-10-2010, 04:35 AM Go to last post
  41. How do i create "nice" prediction hyperbola?

    I would like to create a nice prediction hyperbola in my regression analysis, at this moment i am only getting some rather ugly ones and only where i...

    Started by thedreamshaper‎, 09-16-2010 02:28 PM
    • Replies: 3
    • Views: 3,546
    09-16-2010, 03:55 PM Go to last post
  42. Linear Regression for Traffic Data

    Hi there, I have a two full years of traffic data by month and I am trying to predict traffic for the next two years based on historical growth...

    Started by dramachandran‎, 10-11-2010 06:46 PM
    • Replies: 3
    • Views: 4,750
    10-13-2010, 11:25 AM Go to last post
  43. Excel's t stat question.

    Hi guys, I'm a little confused over this right now. I performed a regression in excel and as an example, this is what i got for my first...

    Started by c2q‎, 11-23-2010 06:14 PM
    • Replies: 3
    • Views: 5,108
    11-23-2010, 06:49 PM Go to last post
  44. Multiple linear regression + QQplots problem! Includes Pics!

    Hello I want to do multiple linear regression, but one of the requirements is the residuals to be normally distributed, and I can check that with...

    Started by emelie_earlgrey‎, 11-25-2010 01:58 PM
    • Replies: 3
    • Views: 3,040
    11-30-2010, 12:34 PM Go to last post
  45. Significance of regression coefficients and interpretation problems

    Dear All, I am currently facing a problem regarding the statistical interpretation of nonsignificant coefficients. I would like to know whether...

    Started by pff‎, 01-07-2011 06:05 AM
    • Replies: 3
    • Views: 8,166
    01-11-2011, 02:28 PM Go to last post
  46. Collinearity

    Hi, Is there any possibility that if colinearity exists between two or more DV variables in a regression analysis, the regression analysis to be...

    Started by alexandros__23‎, 01-16-2011 03:33 PM
    • Replies: 3
    • Views: 5,943
    01-17-2011, 08:00 AM Go to last post
  47. Regression R2 vs Spearman's correlation

    Hi everyone! I have a set of data that shows a very good Spearman's correlation coefficient (p=0,001), but when i calculate a regression equation...

    Started by juacochero‎, 01-17-2011 10:49 AM
    • Replies: 3
    • Views: 19,677
    01-17-2011, 02:32 PM Go to last post
  48. [newbie dumb question] Why is that the assumption of E(u)=0 essential for interences?

    If E(u)=0 is violated, how would it affect the inference of parameters, such as by using t-statistics? My understanding is that if E(u)=0 is...

    Started by elton.li‎, 02-09-2011 06:02 PM
    • Replies: 3
    • Views: 5,303
    02-10-2011, 12:27 AM Go to last post
  49. What test can I use to find out which bivariate regression is *significantly* better?

    I have three variables: y, x1 and x2 (n=130). I want to know whether one of the x variables is a significantly better bivariate predictor than the...

    Started by verarium‎, 02-15-2011 05:32 PM
    • Replies: 3
    • Views: 2,967
    02-16-2011, 01:49 PM Go to last post
  50. [Probit] Can I be confident in my results even with a poor Goodness-of-Fit test?

    I am running a probit analysis on a data set with about 1000 cases, predicting probability of college graduation by a set of college institutional...

    Started by DavidBill‎, 02-18-2011 01:08 PM
    • Replies: 3
    • Views: 4,284
    02-18-2011, 03:27 PM Go to last post
  51. Multi-Level Models with perfectly correlated outcomes

    Hello, I am trying to utilize multilevel regression analysis in SPSS (mixed models) to predict outcomes in negotiations between two individuals....

    Started by Lars Norén‎, 02-26-2011 08:55 PM
    • Replies: 3
    • Views: 2,844
    03-15-2011, 05:39 AM Go to last post
  52. Binary predictors, continuous independent V!

    hi everyone I need help with doing a regression model. How can I perform a regression analysis when the only independent variable is a continuous...

    Started by helloamerica‎, 03-03-2011 12:37 PM
    • Replies: 3
    • Views: 3,817
    03-03-2011, 05:52 PM Go to last post
  53. Regression Assumptions for Binary Dependent Variable Models?

    I was wondering if anyone could direct me to a good source on this, or just answer my question directly. What are the assumptions made for a...

    Started by DavidBill‎, 03-04-2011 12:00 AM
    • Replies: 3
    • Views: 18,847
    03-04-2011, 12:20 PM Go to last post
  54. Linear Regression - Theory

    Hi Guys, I have some theoretical questions about regression models, I need an answer or true or false for the next few phrases.... 1. Leverage...

    Started by WeeG‎, 03-15-2011 05:47 AM
    • Replies: 3
    • Views: 3,362
    03-16-2011, 03:16 AM Go to last post
  55. Regression results

    Hello! I need help with the results of regression analysis. I have significant percentage of variance explained (not big, only 5%), but none of...

    Started by Leyla‎, 03-20-2011 05:08 AM
    • Replies: 3
    • Views: 2,876
    03-20-2011, 04:43 PM Go to last post
  56. Regression in First and Second Differences

    I am running a regression in STATA to determine if temperature effects natural gas production in Russia and I am including the following variables...

    Started by lxh5027‎, 03-21-2011 10:23 PM
    dfuller, first difference, regression, second difference
    • Replies: 3
    • Views: 16,978
    03-22-2011, 05:45 PM Go to last post
  57. is this model misspecified

    i'm doing a regression on size of company (x) to explain revenue multiple (y). i'm using the companies' revenues and divide them into 5 groups...

    Started by ble21ach‎, 03-23-2011 11:20 PM
    • Replies: 3
    • Views: 2,712
    03-25-2011, 11:12 PM Go to last post
  58. Logistic Regression - Residual Deviance > Residual Df

    Hi There I'm doing a logistic regression on a set of data with 753 groups of observations (although some groups just have one observation). In...

    Started by uzuria‎, 03-28-2011 08:31 AM
    • Replies: 3
    • Views: 9,096
    04-03-2011, 08:08 AM Go to last post
  59. Linear Regression Coefficient and Multiple Regression Coefficient

    Hello Folks: When you use just 2 variables for regression and then when you use the same 2 variables plus an additional 2 other independent...

    Started by jintu7977‎, 04-02-2011 10:10 PM
    omitted variable bias
    • Replies: 3
    • Views: 8,394
    04-07-2011, 08:48 PM Go to last post
  60. help with Linear regression with nfl stats please

    Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

    Started by rbskee‎, 04-08-2011 09:41 AM
    • Replies: 3
    • Views: 4,276
    04-09-2011, 01:19 AM Go to last post

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