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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Greatest impact prediction

    Hi, please i have one Question. If i have this results (Stepwise method) Can i say: 1) Better for predict Y is model 4 2) Regression...

    Started by zonicek‎, 03-29-2012 04:52 PM
    • Replies: 1
    • Views: 950
    03-31-2012, 12:39 AM Go to last post
  2. Poisson data pairwise comparisons valid?

    Hi everyone, I'm a bit confused if what I am doing is valid. I thought I would get your two cents worth. I have done a poisson linear...

    Started by lken‎, 03-29-2012 05:29 PM
    • Replies: 3
    • Views: 2,143
    03-30-2012, 02:46 PM Go to last post
  3. Linear regression vs ancova - when to use which

    Hi all, I have some data on species richness, latitude and temperature. In the past on this sort of data I have used multi-linear regression. But it...

    Started by mikeywillcox‎, 03-29-2012 06:59 PM
    • Replies: 1
    • Views: 2,380
    03-29-2012, 07:11 PM Go to last post
  4. Derivation of the lack of fit sum of suares

    Hi, Can anyone show me step by step how to derive the lack of fit sum of squares, I would be very thankful, I'm so lost in this. Thank you.

    Started by justa18unlv‎, 03-29-2012 11:57 AM
    • Replies: 1
    • Views: 1,235
    03-29-2012, 12:05 PM Go to last post
  5. (Beginner!) Questions about regression on CD album sales/internet use/digital music s

    Hello, I am attempting to perform a regression on what has caused the reduction in CD album sales, and need a little assistance. I have 28 data...

    Started by ontheroadtofindout‎, 03-27-2012 12:07 PM
    • Replies: 1
    • Views: 1,391
    03-29-2012, 09:34 AM Go to last post
  6. When should I report heteroskedasticity robust standard errors?

    With regard to a master's thesis in economics I am working on I am running six regressions (see attachment). I find evidence for heteroskedasticity...

    Started by arnetheman‎, 03-29-2012 07:22 AM
    • Replies: 0
    • Views: 1,426
    03-29-2012, 07:22 AM Go to last post
  7. Comparing curves fitted to two quadratic regressions

    Hello, I have constructed two calibration curves, i.e. plotting known concentrations against response. Both of these sets of data seem to fit a...

    Started by Ri89‎, 03-08-2012 07:19 AM
    curves, quadratic regression
    • Replies: 2
    • Views: 3,391
    03-28-2012, 07:30 PM Go to last post
  8. Which regression should I use?????? HELP

    I have a questionnaire with where respondents were asked if they remember seeing a TV commercial, a radio commercial and a magazine add. “Yes or no...

    Started by Kframnes‎, 03-16-2012 04:51 AM
    • Replies: 2
    • Views: 1,596
    03-28-2012, 04:20 PM Go to last post
  9. Heckman model

    Hi, I'm running a heckman model however some issues have arisen: 1. The log likelihood function is not concave and does not converge after a...

    Started by economix‎, 03-28-2012 04:11 PM
    • Replies: 0
    • Views: 1,624
    03-28-2012, 04:11 PM Go to last post
  10. a question about estimates in mixed models

    Hello, I was hoping to be able to find all of the estimates of covariates and of the categories with a number of factors. I found a similar study...

    Started by Dragonwalker‎, 03-28-2012 12:55 AM
    • Replies: 0
    • Views: 917
    03-28-2012, 12:55 AM Go to last post
  11. unrestricted cumulative probit model with vglm()---extend to a multivariate setting?

    Hello. I'm trying to fit a multivariate, unrestricted cumulative probit model. I've had success in fitting a proportional odds probit model using...

    Started by @nthRo‎, 03-27-2012 06:44 PM
    • Replies: 0
    • Views: 1,592
    03-27-2012, 06:44 PM Go to last post
  12. Interaction effect: Do the single variables both need to be significant?

    Dear all, If you have a regression model Y=b0+b1*A+b2*B+b3*A*B, and the dependent variable A and the interaction effect A*B have significant...

    Started by MDT‎, 03-26-2012 04:45 PM
    • Replies: 2
    • Views: 1,511
    03-26-2012, 06:22 PM Go to last post
  13. Determining weighting factors from linear regression

    Hi, I am working on a digital filtering project where I am trying to optimize a filter for a Doppler ultrasound application. Without going in to...

    Started by arefox‎, 03-26-2012 06:20 PM
    • Replies: 0
    • Views: 2,167
    03-26-2012, 06:20 PM Go to last post
  14. 95% confidence intervals for linear regression in excel?

    Hi, I am currently trying to analyse data for my lab experiment and I am having trouble trying to find how to plot individual confidence intervals...

    Started by Paulo1913‎, 03-11-2012 10:42 PM
    • Replies: 1
    • Views: 12,945
    03-26-2012, 11:15 AM Go to last post
  15. Is my sample too big ?

    Hello, I have a sample of 20 continuous variables, along with 3 explanatory (2 continuous and 1 dummy). I am trying to run a regression, linear...

    Started by NN_STAT‎, 03-19-2012 01:48 PM
    • Replies: 3
    • Views: 1,669
    03-26-2012, 10:55 AM Go to last post
  16. Significant Effects after Including Interaction Variable (?) :confused:

    Dear all, I hope you could help me with the following: I have tested two regression models, one with inependent variable A, B, C, D, E and one...

    Started by MDT‎, 03-26-2012 08:57 AM
    • Replies: 0
    • Views: 1,038
    03-26-2012, 08:57 AM Go to last post
  17. help appreciated with a validation exercise

    Hello all, I would really appreciate your help with some statistical analysis (yukh! haha!) A psychometric test has been mapped onto a companies...

    Started by mfarskoury‎, 03-26-2012 06:27 AM
    correlation, mapping, regression, validation
    • Replies: 0
    • Views: 777
    03-26-2012, 06:27 AM Go to last post
  18. Cool Regression with non- parametric data....

    Hello! I have conducted the normality test Anderson-Darling on my data, and with a p value of <0,010, I guess that the data are not normal...

    Started by Rebecka‎, 03-24-2012 08:35 AM
    • Replies: 8
    • Views: 4,389
    03-26-2012, 03:42 AM Go to last post
  19. Where in the Regression Output tells me which are the strongest predictor variables?

    Hi, I'm no statitician (yet), but I'm having a go!! - am looking to design an employee survey and analyse the data in Excel. I have watched many...

    Started by cjcass‎, 03-24-2012 07:36 AM
    • Replies: 4
    • Views: 3,280
    03-25-2012, 01:03 PM Go to last post
  20. using a binary response for a mixed model

    Hello, My journey through mixed models (which is documented in past questions) has been an arduous one, however I appreciate being introduced to...

    Started by Dragonwalker‎, 03-25-2012 01:01 PM
    mixed-models binary lme4
    • Replies: 0
    • Views: 897
    03-25-2012, 01:01 PM Go to last post
  21. Panel Data (Random or Fixed)

    The r = a +bx. is the model There is data for 3 time periods. Are there fixed effects present? Estimate the parameters a and b. The code below...

    Started by samulleg364‎, 03-24-2012 06:45 PM
    • Replies: 0
    • Views: 1,045
    03-24-2012, 06:45 PM Go to last post
  22. Conditional regression

    Hi all, I am trying to run explanatory regression: Y = alpha + Beta1*X*I{X.*Y>0}+Beta2*X*I{X.*Y<=0} where I{} is indicator function Since...

    Started by JustinasBr‎, 03-24-2012 05:35 PM
    conditional regression, dependent variable on rhs
    • Replies: 2
    • Views: 1,627
    03-24-2012, 05:49 PM Go to last post
  23. Best way to control for weekdays when regressing sales data against time.

    I'm trying to use multiple regression to model sales data per day since Jan 1, 2010. I have established a "time index" to facilitate this. So...

    Started by machinist‎, 03-23-2012 11:21 AM
    • Replies: 2
    • Views: 1,537
    03-24-2012, 05:49 PM Go to last post
  24. Production function CES or Cobb-Douglas

    The data y v1 v2 p w1 w2 is data for the estimation of a production function y = f(v1 ,v2). Is Cobb-Douglas or CES? Estimate the parameters. (p=...

    Started by samulleg364‎, 03-24-2012 05:19 PM
    • Replies: 0
    • Views: 2,051
    03-24-2012, 05:19 PM Go to last post
  25. Random Effects Model and Serial Correlation

    I am working on a model where I am using a random effects model. This might seem like a simple question but does the use of the random effects model...

    Started by ohjosr‎, 03-24-2012 10:13 AM
    • Replies: 0
    • Views: 904
    03-24-2012, 10:13 AM Go to last post
  26. p-value of anova when comparing models

    I am asking a new question, however the dataset is related to other questions that I have posted. I am running lmer to determine which factors have...

    Started by Dragonwalker‎, 03-24-2012 09:59 AM
    • Replies: 0
    • Views: 1,167
    03-24-2012, 09:59 AM Go to last post
  27. multiple linear regression rejected - searching for alternative model

    Hey there! I am currently working on a regression model for a logistics problem which includes the transport time as dependent variable and a...

    Started by evident‎, 03-16-2012 09:54 AM
    • Replies: 1
    • Views: 1,202
    03-21-2012, 11:29 PM Go to last post
  28. I think I may finally understand, but a few questions

    Please note that you will find a simplified question below in case you do not have the time to check all of my scripts in the first two posts, but...

    Started by Dragonwalker‎, 03-20-2012 11:18 AM
    mixed-effects aic
    • Replies: 6
    • Views: 1,266
    03-21-2012, 12:28 PM Go to last post
  29. Post which regression analysis model shall i use?

    i am conducting a research on 9 insurance companies from which a 5 year data is collected. Thus, i have to use panel model, but which model fixed...

    Started by asamnew‎, 03-21-2012 04:55 AM
    • Replies: 0
    • Views: 905
    03-21-2012, 04:55 AM Go to last post
  30. Interpreting the conclusion of t-test and explaining the p-value

    Hi, I'm working on an assignment which asks me to interpret the conclusion of my t-test regarding the average reading score and the student teacher...

    Started by shle‎, 03-21-2012 02:13 AM
    • Replies: 0
    • Views: 4,297
    03-21-2012, 02:13 AM Go to last post
  31. Regress y on y-hat

    I need some help to prove that when you regress y on y-hat, the least squares regression line is y = y-hat. y = 0 + 1(y-hat). Thanks!

    Started by jwdzurik‎, 03-20-2012 02:49 PM
    • Replies: 0
    • Views: 1,361
    03-20-2012, 02:49 PM Go to last post
  32. Back-calculating correlation coefficient for transformed data

    Hi everyone, This is my first post on this board so please excuse if I sound like a n00b. I am doing a meta-analysis on plant physiology studies,...

    Started by qdread‎, 03-20-2012 01:08 PM
    • Replies: 0
    • Views: 1,442
    03-20-2012, 01:08 PM Go to last post
  33. Plotting

    Is there any way to plot a normal distributions density tilted on its side along the regression line of a simple linear regression. Meaby just 3-5...

    Started by thedreamshaper‎, 03-19-2012 05:14 PM
    • Replies: 2
    • Views: 1,324
    03-20-2012, 08:57 AM Go to last post
  34. Transforming dependent variable

    I am using a multiple regression with one continuous DV and 9 IVs (mainly categorical and one continuous). My DV, as the mean score on a...

    Started by judith_sw‎, 03-19-2012 08:10 AM
    • Replies: 3
    • Views: 4,000
    03-20-2012, 07:17 AM Go to last post
  35. Mediation question

    If you want to test the hypothesis that the gender difference in brooding will account for the gender difference in anxiety, what would be my...

    Started by pinkk‎, 03-18-2012 10:28 AM
    • Replies: 1
    • Views: 952
    03-18-2012, 04:13 PM Go to last post
  36. xtlogit coefficient interpretations

    I'm working on a project where I am using a logit model in the program Stata. I'm using the xtlogit command with panel data for city and years. My...

    Started by ohjosr‎, 03-17-2012 01:46 PM
    • Replies: 0
    • Views: 2,355
    03-17-2012, 01:46 PM Go to last post
  37. Coefficients of delta-lognormal modeling

    I am trying to understand delta-lognormal modeling. Please bear with me. I am applying this method to some fishery data. This method combines...

    Started by elopomorph‎, 06-25-2011 06:27 PM
    delta lognormal
    • Replies: 2
    • Views: 3,056
    03-16-2012, 11:38 AM Go to last post
  38. plotting moderation

    Hi, I know that for most of you this will sound like a stupid question but I am teaching myself regression and I am quite new.. Does it make sense...

    Started by Sciarada‎, 07-02-2011 09:25 PM
    moderation plot, multinomial regression
    • Replies: 1
    • Views: 2,662
    03-16-2012, 09:30 AM Go to last post
  39. Help! model comparison in logistic regression

    Dear all, I'm working on a logistic regression and have now obtained two competing models (one computed by hand, the other with "step" in R). In...

    Started by caro‎, 03-15-2012 06:31 AM
    • Replies: 3
    • Views: 2,206
    03-16-2012, 03:17 AM Go to last post
  40. question on complete confounding and partial confounding in multiple regression

    While learning multiple regression, I once meet the concepts of “complete confounding” and “partial confounding” In the model, the response...

    Started by winecoding‎, 03-15-2012 10:37 PM
    • Replies: 2
    • Views: 4,092
    03-15-2012, 10:49 PM Go to last post
  41. When to address regression diagnostics on residuals?

    Hi, I have some data and have run a regression with all the variables in. I have then run the residual diagnostics but there are some issues. ...

    Started by regression_is_cool‎, 03-11-2012 08:44 AM
    • Replies: 1
    • Views: 1,294
    03-14-2012, 05:08 PM Go to last post
  42. Possible to analyze cross lag panel data with regression alone (no SEM)?

    I have 2 (soon to be 4) waves of panel data. I have a relatively small sample size so I don't think I should use SEM - also I don't really...

    Started by sm34833‎, 03-12-2012 06:21 PM
    panel data, regression, structural equation model
    • Replies: 7
    • Views: 11,743
    03-14-2012, 10:57 AM Go to last post
  43. Help! Deriving a support vector machine

    Given a training set of points not necessarily linearly separable, we have an SVM obtained by minimizing \frac{1}{2}\lambda \left \| \mathbf{w}...

    Started by spidercano‎, 03-13-2012 08:33 PM
    • Replies: 0
    • Views: 1,101
    03-13-2012, 08:33 PM Go to last post
  44. Multiple logistic regression intercept

    Hello guys and gals, I'm having a me***own trying to understand exactly what the intercept of a multiple logistic regression is telling me/ or if...

    Started by drewmac‎, 01-19-2012 12:40 AM
    • Replies: 3
    • Views: 2,603
    03-13-2012, 12:29 AM Go to last post
  45. Regression with continuous and dummy-coded categorical variables

    Hi everyone, I am trying to figure out differences in the proportions of fallen trees in three ZONES, and nested within ZONES, differences in...

    Started by lken‎, 03-12-2012 06:14 PM
    • Replies: 0
    • Views: 1,503
    03-12-2012, 06:14 PM Go to last post
  46. growth regression results

    I am doing a standard neoclassical growth regression for the European member states for the period 1991-2010. I regress GDP per capita growth on...

    Started by tedylov‎, 03-12-2012 06:02 PM
    • Replies: 0
    • Views: 1,103
    03-12-2012, 06:02 PM Go to last post
  47. 1 predictor, 2 different values for baseline statistic & change statistic?

    Hi, I am conducting a Cox Regression for my first time. I created a simple model with only 1 predictor (categorical), one dependent variable...

    Started by unipsychologist1‎, 03-12-2012 04:09 PM
    change score, chi-sqaured, cox, survival analysis
    • Replies: 0
    • Views: 1,029
    03-12-2012, 04:09 PM Go to last post
  48. Regression on sales,markdown,avgstock

    OUTPUT 1: Call: lm(formula = TySalesUnit ~ TyMarkdown + TyAvgStockUnit) Coefficients: t value Pr(>|t|) ...

    Started by masarimk‎, 03-12-2012 06:46 AM
    • Replies: 0
    • Views: 1,126
    03-12-2012, 06:46 AM Go to last post
  49. The standardized and non standardized coefficients gives diff results

    Hi. Some coworkers ran a regression and used first the beta to analyze the strength of the independent variables in a regression. However all the...

    Started by Kframnes‎, 03-09-2012 04:28 PM
    • Replies: 7
    • Views: 4,507
    03-09-2012, 05:21 PM Go to last post
  50. Binomial regression with x as the dependent variable and n as an independent variable

    Hi all I have a sample size of 100. Out of 100 a certain number are successful at stage one. Of those successful at stage one some are successful...

    Started by emily.stats‎, 03-05-2012 04:24 PM
    2 Pages
    1 2
    binomial, challenge
    • Replies: 15
    • Views: 3,061
    03-08-2012, 05:59 PM Go to last post
  51. warning at logistic reg.

    Hello, I am trying to do logistic regression analysis. The problem I face is that this warning comes out in my output : Due to redundancies,...

    Started by elpaki‎, 03-08-2012 06:51 AM
    • Replies: 0
    • Views: 1,820
    03-08-2012, 06:51 AM Go to last post
  52. Binary DV and orthogonal contrasts

    HEEEEEEEEELLLLPPPPPP!!!!! The data I am trying to analyse has a binary dependent variable (1=yes, 0=no) and tow factors. Factor 1 is a treatment...

    Started by matteovisentin‎, 03-08-2012 04:53 AM
    binary data, categorical data, contrasts, genlin
    • Replies: 0
    • Views: 1,241
    03-08-2012, 04:53 AM Go to last post
  53. Unhappy Single parent-offspring regression

    Does anyone know how to do this? I can't find the web page I found with the full explanation:shakehead Failing that, I am carrying out a study...

    Started by charlotte22‎, 03-08-2012 03:03 AM
    • Replies: 0
    • Views: 2,175
    03-08-2012, 03:03 AM Go to last post
  54. Categorical variables - Logistic regression

    Hello, I am trying to run a logistic regression model. I have 4 numeric and 1 categorical variable which are significant. The categorical...

    Started by nikhil_s‎, 03-07-2012 10:38 AM
    binning, categorical data analysis, categorical vairable, logistic regression
    • Replies: 5
    • Views: 2,946
    03-07-2012, 02:06 PM Go to last post
  55. Moderation, GLM, and interactions. Discrepent results...

    Hello all, I'm running a GLM to test for moderation. One of my interaction terms (the product of two continuous variables) looks suspicious......

    Started by cellardoor.‎, 03-06-2012 07:04 PM
    • Replies: 0
    • Views: 1,587
    03-06-2012, 07:04 PM Go to last post
  56. Interaction terms between correlated predictors

    Hello, I'm trying to test how the amount of native forest in a landscape affects the number of bird species, and how this relationship varies with...

    Started by souffle‎, 03-01-2012 09:55 PM
    • Replies: 2
    • Views: 1,927
    03-06-2012, 06:12 PM Go to last post
  57. Need help understanding an equality associated with regression analysis

    Hi everyone, I am attempting to understand the implications the equality listed below has in regards to regression models. The equality is...

    Started by phightins530‎, 03-06-2012 02:13 PM
    • Replies: 4
    • Views: 1,314
    03-06-2012, 04:20 PM Go to last post
  58. Is Slope A statistically different from Slope B? *URGENT*

    Hey everyone, Really need urgent help here. I am trying to determine if the change in the slope of a line (beta) is statistically significant...

    Started by explicit‎, 03-06-2012 01:25 AM
    • Replies: 7
    • Views: 20,161
    03-06-2012, 11:39 AM Go to last post
  59. Does fitting of a regression line as such contribute to mass significance?

    Is the fitting of a regression line (least squares, for a given number of predictors) as such to be regarded a statistical test that can contribute...

    Started by Bassler‎, 03-06-2012 05:04 AM
    false positives, fitting a line, least squares, mass significance, regression line
    • Replies: 0
    • Views: 980
    03-06-2012, 05:04 AM Go to last post
  60. Semi-saturated Fixed Effects

    Today my supervisor instructed me to try to use semi-saturated Fixed Effects analysis. I have tried searching for "semi-saturated" and "saturated"...

    Started by Laco‎, 03-01-2012 01:07 PM
    • Replies: 4
    • Views: 1,974
    03-04-2012, 01:15 PM Go to last post

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