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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Linear regression help

    hi everyone, I'm new at university and working on this assignment. Basically what I want to determine is the relationship between the percentage...

    Started by phil ma‎, Today 06:03 PM
    linear regression
    • Replies: 1
    • Views: 95
    Today, 07:26 PM Go to last post
  2. Regression Analysis based on least square method

    Dear colleagues, I need some help with SPSS. I did an experimental study and found that from dimensional analysis that my dependent variable is...

    Started by Altaf Taqi‎, Today 07:07 AM
    • Replies: 0
    • Views: 88
    Today, 07:07 AM Go to last post
  3. ARMA Model Output & Excel

    Dear All, I am using my Eviews Output of an ARMA Model, taking the coefficients in other to perform my Forecasts in Excel. However, I am not being...

    Started by joaom‎, 04-18-2014 12:51 PM
    • Replies: 1
    • Views: 123
    Yesterday, 07:41 AM Go to last post
  4. Link function for proportional outcome

    I have a data set where the outcome variable is percent passing (ELA and Math tests) for school districts. I will use a 2 level multilevel model...

    Started by trinker‎, 04-18-2014 12:09 PM
    2 Pages
    1 2
    distribution, link, multilevel
    • Replies: 23
    • Views: 278
    04-18-2014, 01:42 PM Go to last post
  5. Help on illustrating the fit of a model

    Hi, I've made a model for real estate price growth in my master's thesis. I want to show how well (or bad) the model fits the data. The problem...

    Started by ladf‎, 04-15-2014 10:39 AM
    • Replies: 0
    • Views: 143
    04-15-2014, 10:39 AM Go to last post
  6. Multicollinearity in foraging distance model

    Hi all, I have a model looking at distance travelled ~ body mass + wing area The problem is that wing area is correlated with body mass but...

    Started by killbot2000‎, 04-15-2014 04:56 AM
    • Replies: 2
    • Views: 126
    04-15-2014, 10:03 AM Go to last post
  7. Interactions cancel my main effects

    I was looking at the effects of : poverty, political interest, satisfaction with democracy and political trust on political participation through...

    Started by Annvdb‎, 04-15-2014 12:49 AM
    • Replies: 5
    • Views: 106
    04-15-2014, 03:13 AM Go to last post
  8. Help with Panel data

    Hi everyone I am doing a research which involve a panel data analysis with dependant variable that take the value of 1-100. This value is a result...

    Started by Sultan‎, 04-14-2014 02:48 PM
    • Replies: 0
    • Views: 184
    04-14-2014, 02:48 PM Go to last post
  9. Mediation Analysis with Dichotomous Outcomes - Effect Size for Indirect Effect

    Hello, I would like to run a mediation analysis where my predictor (X) is continuous, my mediator (M) is continuous, but my outcome variable (Y)...

    Started by lespullman‎, 04-14-2014 02:39 PM
    mediation; binary outcome
    • Replies: 0
    • Views: 66
    04-14-2014, 02:39 PM Go to last post
  10. Problems with time series model

    Hello. I want to run a pretty simple ADL model, and I have a couple of problems: My model: - Consumption (Ct) as the dependent variable -...

    Started by TCAC‎, 04-08-2014 10:40 AM
    • Replies: 4
    • Views: 180
    04-14-2014, 12:01 PM Go to last post
  11. Dispersion parameter

    I have the understanding that the dispersion parameter, \phi, in generalised linear models needs to be known for deviance to meaningful or otherwise...

    Started by Prometheus‎, 04-07-2014 03:13 PM
    dispersion parameter, glm
    • Replies: 7
    • Views: 241
    04-14-2014, 07:11 AM Go to last post
  12. Tests for goodness of fit, logistic regression

    What could be for a reason, that Hoshmer and Lemeshow test says that model is good (p-value>0.9), bet Andrews test gives p - value=0 (always)? I have...

    Started by MissEwy‎, 04-14-2014 03:40 AM
    • Replies: 0
    • Views: 131
    04-14-2014, 03:40 AM Go to last post
  13. Hypotheses testing if R=1

    Dear all, Since the R value of my regression model is one, I can neither conduct a t-test nor a F-test. Is this a problem with regard to...

    Started by yosi‎, 04-09-2014 06:12 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 688
    04-11-2014, 02:30 PM Go to last post
  14. Covariance

    Hi, I'm studying econometrics and have been utterly swamped by this question. I have a set of statistics in the question. Mean of X, Mean of Y,...

    Started by SecretDuck‎, 04-11-2014 09:19 AM
    • Replies: 0
    • Views: 158
    04-11-2014, 09:19 AM Go to last post
  15. coefficient standardization

    Hi All, I am working on a 2nd order regression. The span of coefficient is large (say 1:10000). So the coefficients of 2nd order are very big and...

    Started by bettertony‎, 04-10-2014 04:03 PM
    multiple regression, second order polynomial, standardization
    • Replies: 0
    • Views: 94
    04-10-2014, 04:03 PM Go to last post
  16. Predicting rare events using weight-adjusted logistic regression

    This is a simulation study I adapted from sas website. Suppose my probably follows the following relationship, x=rannor(12342); ...

    Started by CRNZNH‎, 12-07-2012 11:37 PM
    • Replies: 2
    • Views: 941
    04-09-2014, 02:26 PM Go to last post
  17. Unhappy How to apply GEE and how to use it for critical mass

    Hi, sorry I am completely new to the forum and as well to using GEE and SPSS so I hope my question is not to confusing. My dependent variable is...

    Started by Angyal-jule‎, 04-09-2014 10:49 AM
    critical mass, gee, independent variable, spss
    • Replies: 0
    • Views: 175
    04-09-2014, 10:49 AM Go to last post
  18. Hausman test VS Mundlak model; choosing between fixed-effects and random-effects

    I am using panel data and I have to choose between fixed-effect and random-effect models. I run the Hausman test, the H0 (i.e., the difference in...

    Started by lukeskywalker84‎, 04-09-2014 10:05 AM
    fixed effects model, hausman, mundlak, random effects model
    • Replies: 0
    • Views: 140
    04-09-2014, 10:05 AM Go to last post
  19. 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: 94
    04-08-2014, 06:48 PM Go to last post
  20. 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: 94
    04-08-2014, 02:02 PM Go to last post
  21. 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: 125
    04-08-2014, 08:13 AM Go to last post
  22. 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: 130
    04-06-2014, 05:10 AM Go to last post
  23. 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: 256
    04-05-2014, 04:13 PM Go to last post
  24. 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: 223
    04-04-2014, 07:55 PM Go to last post
  25. Rare suppressor effect?

    Hey, I recently discovered a somewhat surprising result in a hierarchical regression: I have three predictors (C M N) and one outcome (D). ...

    Started by asbjorng‎, 03-18-2014 03:40 AM
    • Replies: 1
    • Views: 193
    04-04-2014, 08:43 AM Go to last post
  26. 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: 179
    04-04-2014, 07:44 AM Go to last post
  27. [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: 203
    04-03-2014, 10:27 PM Go to last post
  28. 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: 149
    04-03-2014, 04:43 AM Go to last post
  29. 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: 144
    04-02-2014, 10:02 PM Go to last post
  30. 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: 149
    04-02-2014, 05:39 PM Go to last post
  31. 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: 111
    04-01-2014, 05:18 PM Go to last post
  32. 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: 233
    04-01-2014, 10:13 AM Go to last post
  33. 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: 138
    04-01-2014, 03:32 AM Go to last post
  34. 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 03:51 PM
    • Replies: 2
    • Views: 3,939
    03-31-2014, 06:13 AM Go to last post
  35. 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: 162
    03-30-2014, 02:09 PM Go to last post
  36. 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: 172
    03-30-2014, 02:04 PM Go to last post
  37. 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: 240
    03-30-2014, 01:24 PM Go to last post
  38. 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: 151
    03-30-2014, 10:34 AM Go to last post
  39. 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: 206
    03-30-2014, 03:55 AM Go to last post
  40. 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: 126
    03-29-2014, 08:32 PM Go to last post
  41. 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: 134
    03-29-2014, 05:54 PM Go to last post
  42. 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: 132
    03-28-2014, 04:15 AM Go to last post
  43. 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: 168
    03-27-2014, 03:50 PM Go to last post
  44. 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: 191
    03-27-2014, 11:41 AM Go to last post
  45. 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: 117
    03-27-2014, 10:33 AM Go to last post
  46. 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: 1,147
    03-27-2014, 08:17 AM Go to last post
  47. 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: 215
    03-27-2014, 05:47 AM Go to last post
  48. Interaction not significant but Johnson-Neyman finding significant regions

    I'm using the PROCESS macro and applying the Johnson-Neyman technique to some simple moderation analyses. I'm not quite sure what to make of some of...

    Started by syzergy‎, 03-26-2014 03:01 PM
    • Replies: 1
    • Views: 122
    03-26-2014, 03:54 PM Go to last post
  49. 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: 115
    03-26-2014, 01:29 PM Go to last post
  50. 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: 168
    03-26-2014, 08:30 AM Go to last post
  51. 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 10:40 AM
    cox, model, regression, survival analysis, variable selection
    • Replies: 8
    • Views: 350
    03-25-2014, 06:05 PM Go to last post
  52. 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: 172
    03-25-2014, 02:33 PM Go to last post
  53. 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: 139
    03-25-2014, 07:30 AM Go to last post
  54. 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: 144
    03-24-2014, 04:47 PM Go to last post
  55. 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 03:59 PM
    • Replies: 6
    • Views: 526
    03-22-2014, 02:04 PM Go to last post
  56. 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: 162
    03-22-2014, 02:48 AM Go to last post
  57. 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: 136
    03-21-2014, 10:45 PM Go to last post
  58. 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: 170
    03-21-2014, 03:21 PM Go to last post
  59. 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: 93
    03-21-2014, 11:18 AM Go to last post
  60. 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: 163
    03-21-2014, 08:52 AM Go to last post

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