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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Interpretation of an outliers ....what do they really mean?

    I wanted to identify outliers when one value was a time in service and another was total cost. The way I intepreted such points was that these were...

    Started by noetsi‎, 04-08-2014 01:04 PM
    • Replies: 1
    • Views: 1,067
    04-08-2014, 06:48 PM Go to last post
  2. Getting values larger than 1 for a logit test?

    I have run a logit test on a binary dependent variable "gambled?" against "Age" in STATA. I have the dependent variable coded as 0 for no and 1 for...

    Started by AliT128‎, 04-08-2014 12:20 PM
    binary, interpret, logit, stata, variable
    • Replies: 4
    • Views: 1,334
    04-08-2014, 02:02 PM Go to last post
  3. Regression

    Variable Y is predicted with variables X1 and X2 in the following regression equation: Y = 4 + 2X1 3X2. a. Which value of Y do you predict for...

    Started by Tadele‎, 04-08-2014 07:38 AM
    • Replies: 1
    • Views: 1,085
    04-08-2014, 08:13 AM Go to last post
  4. MLE or instrumental variables

    I'm trying to estimate a model in which one of the explanatory variables is correlated with the error term. As I see it there are two alternatives,...

    Started by kungal‎, 04-06-2014 05:10 AM
    instrumental variables, maximum likehood
    • Replies: 0
    • Views: 1,006
    04-06-2014, 05:10 AM Go to last post
  5. Conceptual question on linear regression and data fitting

    Hi all, I've been grappling with this question posed during class but can't seem to grasp it due to my sadly inadequate understanding of linear...

    Started by richya‎, 04-03-2014 01:53 PM
    • Replies: 1
    • Views: 1,346
    04-05-2014, 04:13 PM Go to last post
  6. Can i use regression analysis for this problem?

    Hi So im doing a study and i want to see if there is a trend here What i got: I got data that depends on if a certain animal is using a area (low...

    Started by No idea whats going on‎, 04-04-2014 06:27 PM
    help me
    • Replies: 1
    • Views: 1,237
    04-04-2014, 07:55 PM Go to last post
  7. Unbalanced dependent sample and intercept correction

    Hi, I’m running a logistic regression analysis in SPSS and wanted to ask about the sample values for the dependent variable (landslide presence)....

    Started by mattdoughty‎, 04-04-2014 03:10 AM
    intercept correction, logistic regression, sample distribution
    • Replies: 1
    • Views: 2,073
    04-04-2014, 07:44 AM Go to last post
  8. [SOLVED] model coefficients

    I need a little help with the output of this model. Below is the output of a linear model of log river flow over time: ...

    Started by bugman‎, 04-03-2014 01:00 AM
    • Replies: 4
    • Views: 1,499
    04-03-2014, 10:27 PM Go to last post
  9. Difference multinomial logistich with ordinal dependent and ordinal regression

    Hi :) I am looking at a very large dataset in which I want to do a regression analyses on an ordinal variable (scores on a test divided in 4...

    Started by inge1804‎, 04-03-2014 04:43 AM
    • Replies: 0
    • Views: 915
    04-03-2014, 04:43 AM Go to last post
  10. Proving variance of b0(hat)

    i have a question asking to prove (attached image): I'm completely stuck and any help would be appreciated. thanks

    Started by s-z‎, 04-02-2014 02:24 AM
    • Replies: 3
    • Views: 8,463
    04-02-2014, 10:02 PM Go to last post
  11. Slope Analysis for three-way interaction terms in regression equation

    Hi everyone, I am completely new to this forum so I hope my question is not repetitive. Working on my PhD dissertation I am trying analyze 3-way...

    Started by negar.arefi‎, 04-02-2014 11:41 AM
    • Replies: 2
    • Views: 1,705
    04-02-2014, 05:39 PM Go to last post
  12. Least Angle when A* A is singular.

    I want to use Least Angle to least-squares-ify an overdetermined \textbf{Ax=b} because I'd like to minimize ||\textbf{x}||_1. The problem is, my...

    Started by MackTuesday‎, 04-01-2014 05:18 PM
    • Replies: 0
    • Views: 1,182
    04-01-2014, 05:18 PM Go to last post
  13. Clustered Robust SEs or Multilevel Modeling approach? HELP NEEDED :-)

    Hello everyone, I would love to hear your quick reaction to a particular data structure my colleagues and I are working with because we keep...

    Started by ema2146‎, 03-31-2014 09:45 AM
    • Replies: 7
    • Views: 1,789
    04-01-2014, 10:13 AM Go to last post
  14. Boosted regression versus OLS regression

    Dear all I am working on estimating a linear model using boosting regression technique to estimate the parameters. This is a slightly different...

    Started by susan01‎, 04-01-2014 03:32 AM
    boosting, linear models, regression analysis
    • Replies: 0
    • Views: 2,444
    04-01-2014, 03:32 AM Go to last post
  15. Regression with an Index as a dependent variable

    Dear all, I need help with a regression. My dependent variable is an index (ranging from 0 to 1). My independent variables are a dummy and a...

    Started by LillyLawson‎, 12-11-2010 04:51 PM
    • Replies: 2
    • Views: 12,383
    03-31-2014, 06:13 AM Go to last post
  16. logistic regression categorical predictors

    Hello, I really need help in understanding this: I have a categorical predictor- let's say education with 5 levels. The spss output gives me...

    Started by orchidn‎, 03-30-2014 02:09 PM
    • Replies: 0
    • Views: 1,456
    03-30-2014, 02:09 PM Go to last post
  17. Differences in different groups

    Hey guys, I need help with a data set I am trying to do analysis on. I have 650 randomly chosen observations of bugs. I want to find out if there...

    Started by jimmycastor‎, 03-30-2014 02:04 PM
    • Replies: 0
    • Views: 1,467
    03-30-2014, 02:04 PM Go to last post
  18. Question Linear Regression:Controlling for categorical independent variables, WITHOUT dummies?

    Short version: Does including a categorical nominal-level independent variable WITHOUT dummies still work as a simple control for other independent...

    Started by khaidoba‎, 03-24-2014 12:45 PM
    categorical variable, dummy coding, linear regression, nominal variable
    • Replies: 7
    • Views: 2,531
    03-30-2014, 01:24 PM Go to last post
  19. 2-stage Heckman instrumental variable estimation

    Hi Guys, I am working on my thesis. My main regression model is the following: (1) Y=x1*Payment+x2*Country+x3*Industry..... All independent...

    Started by maxt‎, 03-30-2014 10:34 AM
    endogeneity, heckman, ols, selection bias
    • Replies: 0
    • Views: 2,085
    03-30-2014, 10:34 AM Go to last post
  20. Fixed effects estimation: how many dummy variables can be included in model

    Dear community, For my Bachelor-Thesis I have to assess the link between a firm's connectedness and success. For this purpose I was given data...

    Started by Benni‎, 03-28-2014 03:41 PM
    • Replies: 1
    • Views: 1,616
    03-30-2014, 03:55 AM Go to last post
  21. categorical predictors with multiple categories in logistic regression

    Hi, I have a predictor X with 6 classes (X1, X2, X3, X4, X5, X6) in a logistic regression model. The p value for the class of reference (X1) is...

    Started by orchidn‎, 03-29-2014 06:26 PM
    • Replies: 1
    • Views: 2,049
    03-29-2014, 08:32 PM Go to last post
  22. Weight vs. days

    Let's say I keep records for 10 days and now I want to use the straight least squares fit line to predict my weight in the next 10, or 100, days. ...

    Started by Outlier‎, 03-26-2014 09:03 PM
    • Replies: 1
    • Views: 1,281
    03-29-2014, 05:54 PM Go to last post
  23. Help to determine possible endogeneity bias

    Hi, I have a Panel of 40 groups and a model where the variables are measured as deviations from group averages. E.g. d.x_it = x_it - mean(x_it)....

    Started by ladf‎, 03-24-2014 09:10 AM
    • Replies: 1
    • Views: 2,102
    03-28-2014, 04:15 AM Go to last post
  24. Deviance

    Just trying to understand generalised linear models, and got this from S+. I must have fallen asleep when the null and residual deviances were...

    Started by Prometheus‎, 03-27-2014 03:47 PM
    • Replies: 1
    • Views: 1,569
    03-27-2014, 03:50 PM Go to last post
  25. Converting nominal dependent to interval variables through use of dummy variables

    Dear all, My research involves the independent interval variable of Socio-Economic Status (SES), the ordinal independent variable of self-efficacy...

    Started by GDP9‎, 03-26-2014 01:18 PM
    • Replies: 5
    • Views: 1,568
    03-27-2014, 11:41 AM Go to last post
  26. Help needed with time series cross sectional regression

    Hi all. I'm currently running a time series cross sectional regression on SAS 9.3. I have 7 variables: firm (f), time (t), stock returns (ar),...

    Started by Radfern‎, 03-27-2014 10:33 AM
    • Replies: 0
    • Views: 3,141
    03-27-2014, 10:33 AM Go to last post
  27. Cutoff points in logistic regression

    One of the articles I am reading now makes reccomendations for changing the cuttoff point used in predicting whether Y=1 or 0. My question is, since...

    Started by noetsi‎, 07-05-2013 12:34 PM
    • Replies: 6
    • Views: 13,260
    03-27-2014, 08:17 AM Go to last post
  28. Linear Regression Help

    I am currently running analysis of my data in SPSS, and I am at kind of loss of how to run the

    Started by Red72‎, 03-26-2014 10:19 AM
    • Replies: 5
    • Views: 2,074
    03-27-2014, 05:47 AM Go to last post
  29. Semipartial correlations for simple slopes

    Hello! I'm in need of some help for calculating sr2 for simple slopes. Here is my situation: I'm using SPSS. I have three IVs: x1:...

    Started by reneem85‎, 03-26-2014 01:29 PM
    effect size, interaction effects, interactions, regression, simple effects
    • Replies: 0
    • Views: 974
    03-26-2014, 01:29 PM Go to last post
  30. How to improve regression fit, if I know that certain data points have an error

    Dear all I am encountering a problem in my regression analysis with 1 independent and 1 dependent variable. In my plots, there are certain points...

    Started by Corsa‎, 03-26-2014 03:36 AM
    • Replies: 1
    • Views: 843
    03-26-2014, 08:30 AM Go to last post
  31. number of variables for a model

    I am now trying to build a cox model: h(t, beta) = h0(t)exp(X*beta) I have selected some variables from the data, and for a category variable, if...

    Started by pepsico007‎, 02-22-2014 11:40 AM
    cox, model, regression, survival analysis, variable selection
    • Replies: 8
    • Views: 3,061
    03-25-2014, 06:05 PM Go to last post
  32. Post-hoc MR study

    Hey everyone. I offered to help a faculty member prepare a manuscript from some data that had previously been collected via survey. This is a...

    Started by krytellan‎, 03-25-2014 11:01 AM
    • Replies: 1
    • Views: 1,335
    03-25-2014, 02:33 PM Go to last post
  33. Logistic Regression Collapsing Levels

    When previously working with a data set, due to a low number of observations in some of my data cells I was advised to collapse two of my ordered...

    Started by loops22‎, 03-25-2014 06:56 AM
    • Replies: 1
    • Views: 1,300
    03-25-2014, 07:30 AM Go to last post
  34. Can I combine PCA terms with real variables?

    Hello, I'm new to this forum. Hopefully I am doing this right! I am trying to do a multiple regression analysis on a data set that has about 250...

    Started by Adrian_‎, 03-24-2014 04:47 PM
    • Replies: 0
    • Views: 1,513
    03-24-2014, 04:47 PM Go to last post
  35. Logistic regression

    Good afternoon, I write to you for 3 questions. Thanks for your help. When in a regression analysis the correct model is unknown before the...

    Started by figone‎, 01-29-2014 04:59 PM
    • Replies: 6
    • Views: 3,141
    03-22-2014, 02:04 PM Go to last post
  36. How to select the training dataset

    I have a dataset which contains dependent variance Y and several independent variances X1, ... , X10. Y has 5 possible values: A, B, C, D, E, a...

    Started by pepsico007‎, 03-22-2014 12:05 AM
    data sample, sample population, sample size determination, test data, training data
    • Replies: 2
    • Views: 1,707
    03-22-2014, 02:48 AM Go to last post
  37. how to describe the residual plots.. plz help

    Hello everyone... can you guys help me describe the residual plot.. whether it shows some sort of pattern of not and also whether it shows...

    Started by phantomneo‎, 03-21-2014 10:45 PM
    • Replies: 0
    • Views: 3,341
    03-21-2014, 10:45 PM Go to last post
  38. Post SPSS regression:Does this new variables add to the model fit?

    PLEASE HELP ME THOSE QUESTIONS: SPSS output from a set of three regressions estimated using the auto data we explored in the tutorials. Use the...

    Started by catoon2b‎, 03-21-2014 02:51 PM
    • Replies: 1
    • Views: 1,737
    03-21-2014, 03:21 PM Go to last post
  39. Probability

    I am looking at hypothetical scenarios in which I am taking the frequency of number of steals per transaction. If I am specifically trying to find...

    Started by inow‎, 03-21-2014 11:18 AM
    • Replies: 0
    • Views: 917
    03-21-2014, 11:18 AM Go to last post
  40. Finding R^2 when you know the trend

    I'm working on making NBA player projections for fantasy basketball. Right know I have my projections and I'm looking at the correlations for each...

    Started by mattdh12‎, 03-21-2014 08:52 AM
    • Replies: 0
    • Views: 1,400
    03-21-2014, 08:52 AM Go to last post
  41. Is the fixed effect model for regression correct

    Hi all, we have a dataset that has final exam Total_score(of students) from 500 random Schools. Some schools have ICT lab other do not have it,...

    Started by SShams‎, 03-21-2014 04:05 AM
    fixed effect, regression
    • Replies: 0
    • Views: 1,254
    03-21-2014, 04:05 AM Go to last post
  42. PLEASE HELP, is this Linear?

    thankyou in advance

    Started by clh2‎, 03-20-2014 05:29 PM
    • Replies: 0
    • Views: 1,358
    03-20-2014, 05:29 PM Go to last post
  43. Help with understanding methodology of WLS model

    Hi everyone, I'm working on duplicating this paper http://static.googleusercontent.com/media/research.google.com/en/us/pubs/archive/38355.pdf but...

    Started by goducks13‎, 03-20-2014 01:56 PM
    • Replies: 1
    • Views: 1,772
    03-20-2014, 05:04 PM Go to last post
  44. Breusch Pagen test ?! Urgent, how to report APA style

    Hi, I've uploaded an attachment of the residual plot I got from a multiple regression. That line of diagonal lines maks me think that there is...

    Started by clh2‎, 03-20-2014 01:16 PM
    • Replies: 3
    • Views: 3,592
    03-20-2014, 04:49 PM Go to last post
  45. Regression Tree Help Using Rattle portion of R

    Hi all, I was wondering if someone could help me with an explanation of a Regression Tree I have created using the Rattle portion of R. I have...

    Started by glorifiedfisherman‎, 03-18-2014 08:59 PM
    • Replies: 4
    • Views: 3,339
    03-20-2014, 12:19 PM Go to last post
  46. Normality of residuals in regression: is it mandatory?

    Hi everyone, as I said in a previous post I'm new to this forum, but I have basic concepts of statistics (I mean, I'm not a stat guru but I can deal...

    Started by ale83t‎, 03-19-2014 09:10 AM
    • Replies: 3
    • Views: 1,529
    03-19-2014, 10:48 AM Go to last post
  47. [SOLVED] Describe curve of growth model

    I'm reading a paper now and want to describe the curves as seen here: Are the bottom 2 lines considered exponential decay. What would the...

    Started by trinker‎, 03-18-2014 01:26 PM
    • Replies: 8
    • Views: 1,916
    03-18-2014, 08:05 PM Go to last post
  48. IRR interpretation from log transformed data

    I've created a negative binomial regression model in Stata (overdispersed count data). I initially divided my predictor variable into quartiles...

    Started by thirty006‎, 03-14-2014 01:03 PM
    • Replies: 3
    • Views: 2,795
    03-18-2014, 09:44 AM Go to last post
  49. OLS regression with firm and time fixed effects panel model

    pls delete

    Started by Gregor‎, 03-16-2014 04:18 AM
    • Replies: 1
    • Views: 1,609
    03-17-2014, 03:20 PM Go to last post
  50. Interpreation of flat correlogram - ARMA model

    I have been asked to build an ARMA model for some oil WTI spot prices. I have manipulate the data to make it stationary (taking log-returns), and...

    Started by barbara_egos‎, 03-17-2014 11:38 AM
    acf, arma, autocorrelation, correlogram, pacf
    • Replies: 1
    • Views: 2,786
    03-17-2014, 01:40 PM Go to last post
  51. Predicted probabilities from logistic regression

    Hi, I have carried out logistic regression in STATA to adjust for several patient characteristic variables that are thought to affect my outcome....

    Started by j00sel00se‎, 03-14-2014 08:20 AM
    logistic regression, predictions
    • Replies: 4
    • Views: 2,516
    03-17-2014, 04:51 AM Go to last post
  52. Wald Test

    Hi all, I need some advice relating to the programs file , and the Excel data file, as attached: 1. I ran a rolling Ward break point test...

    Started by wand‎, 03-16-2014 11:50 AM
    • Replies: 0
    • Views: 1,543
    03-16-2014, 11:50 AM Go to last post
  53. Ranking Based On Point Differential Only

    Good Morning, I am working on a model that ranks men's college basketball teams based on point differential. The model is an SQL/VBA model that...

    Started by GustoTangerine‎, 03-15-2014 12:08 PM
    • Replies: 0
    • Views: 918
    03-15-2014, 12:08 PM Go to last post
  54. Using Regression Analysis to Map requirement Request to developers

    Pls i need help on how to use regression analysis to map requirement request to the software developers....Pls its urgent! anybody got an idea on how...

    Started by Fujah‎, 03-14-2014 05:26 AM
    mapping, regression analysis
    • Replies: 2
    • Views: 1,538
    03-14-2014, 09:03 AM Go to last post
  55. Interaction terms

    Dear all, I would like to hear your thoughts/ideas/comments on this. Brambor et al. (2006) write the following on interaction terms: "The...

    Started by lbv‎, 03-13-2014 08:24 AM
    • Replies: 0
    • Views: 1,529
    03-13-2014, 08:24 AM Go to last post
  56. least trimmed squared regression-basic question

    Hi..i want to use least trimmed squared (LTS) for regression. i've written the coding in R as follow: lts2_M1<-function(failure) { ...

    Started by jiji‎, 03-10-2014 08:31 PM
    • Replies: 0
    • Views: 1,611
    03-10-2014, 08:31 PM Go to last post
  57. Use of Intercept Term in OLS Regression

    When is it appropriate to exclude the intercept term from a standard OLS regression? The dependent variable is Sales (of a particular product) and...

    Started by GLHartland‎, 06-07-2011 11:05 PM
    • Replies: 11
    • Views: 17,904
    03-10-2014, 03:19 PM Go to last post
  58. Probit correct test to use?

    Hi all. I'm conducting a small survey and am trying to figure out if the test I'm using is correct. For example, one of the questions is "How...

    Started by StudentFred2‎, 03-10-2014 11:03 AM
    • Replies: 0
    • Views: 873
    03-10-2014, 11:03 AM Go to last post
  59. Categorical dependent variables / ANOVA

    Hi all! Newbie here. In my current work role, I'm thought of as an expert on stats. This is totally untrue - but it doesn't take much to be seen...

    Started by DOER‎, 03-05-2014 10:34 AM
    • Replies: 14
    • Views: 2,893
    03-10-2014, 09:27 AM Go to last post
  60. Cenetering: Not that hard (unless you don't fully get it)

    I'm a hands on visual learner. So I read about: gran mean and group mean centering. I also read this seminal piece by Enders and Tofighi:...

    Started by trinker‎, 03-09-2014 01:53 PM
    centering
    • Replies: 2
    • Views: 1,451
    03-10-2014, 09:24 AM Go to last post

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