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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Urgent: data format in regression analyses

    Hi all, I'm suffering a lit bit with some data I have to analyse (my first time...) and I have many doubts. We manipulated 3 IVs that were shown...

    Started by Phoolan_D‎, Yesterday 11:13 PM
    • Replies: 0
    • Views: 64
    Yesterday, 11:13 PM Go to last post
  2. moderation in SPSS vs. PROCESS

    Hi. I did mediation and moderation analysis of one model in 2 programs: SPSS and PROCESS (macro). Mediation was the same, but moderation was...

    Started by Ginny Joyce‎, 10-15-2016 09:14 AM
    moderation, process, spss
    • Replies: 1
    • Views: 160
    Yesterday, 10:40 PM Go to last post
  3. Regression with two data sets?

    I have two data sets. Set 1 contains daily flights and delay data: Flight Date Carrier Departure Delay, ranging from 0 to 1650 minutes. ...

    Started by kdsan‎, 11-01-2016 10:49 PM
    • Replies: 1
    • Views: 188
    Yesterday, 10:35 PM Go to last post
  4. Lightbulb Need help with data for regression analysis

    I have extracted the following values from Draper and Smith (1998) for independent variable X, dependent variable Y for regression analysis: ...

    Started by Johsins69‎, 11-22-2016 12:17 PM
    • Replies: 2
    • Views: 159
    Yesterday, 10:09 PM Go to last post
  5. LinearRegressionQuestions

    Hello, Can someone please help with Question 1.3 onwards in the attached file. Thanks, AJ

    Started by analyticsjane‎, Yesterday 07:50 AM
    • Replies: 0
    • Views: 79
    Yesterday, 07:50 AM Go to last post
  6. Interpretation Interaction Term

    Hey, maybe you could help me with this interpretation (i'm learning with the slides). The model is about employment chances and the independen...

    Started by Hansbusch‎, 12-09-2016 06:23 PM
    • Replies: 0
    • Views: 83
    12-09-2016, 06:23 PM Go to last post
  7. Table interpretation (odds)

    Can someone help me interpret and understand this table? The question is: What effect does the age have on the odds for bodyweight=1 for persons who...

    Started by dymatize‎, 12-08-2016 08:14 AM
    • Replies: 2
    • Views: 125
    12-09-2016, 05:06 PM Go to last post
  8. conditional logit model_help with data interpretation

    0 down vote favorite I have performed a clogit following the instruction of Aizaki et al.2012 but I am not sure on how to interpret some results...

    Started by senzu‎, 12-08-2016 12:13 PM
    clogit, coefficient, logit model
    • Replies: 4
    • Views: 134
    12-09-2016, 09:26 AM Go to last post
  9. Logistic Regression - Predicted Probabilities with unknown variables

    Hi all, I'm wondering about how to calculate predicted probabilities using a binary logistic regression model when one or more of the variables in...

    Started by augustin‎, 12-06-2016 05:21 PM
    logistic regression
    • Replies: 2
    • Views: 144
    12-07-2016, 10:11 AM Go to last post
  10. Mixed effects using nlme in R

    If I include an interaction (time*score) in my model the main effect (score) is significant. However, if I remove the covariate (time), the effect...

    Started by Palermo‎, 12-05-2016 05:55 PM
    • Replies: 2
    • Views: 220
    12-06-2016, 11:32 AM Go to last post
  11. Hello, I need some help please with two problems

    Hey guys, I have been struggling in this class and I am down to the last week, I have to pass this homework and extra credit problem to pass the...

    Started by run2rush2112‎, 12-02-2016 10:11 PM
    • Replies: 2
    • Views: 231
    12-04-2016, 08:13 PM Go to last post
  12. Regression for comparing two groups on one variable? And t-test with survey data?

    Hi - I have two populations / groups that I need to compare on one variable. Now usually I would use a t-test or anova but ive been told that...

    Started by TruroJP‎, 11-30-2016 05:01 PM
    analysis, anova, regression, t-test
    • Replies: 2
    • Views: 155
    12-02-2016, 04:41 PM Go to last post
  13. Multiple Logistic Regression question

    Greetings, I have three categorical IVs and one categorical DV. However, the DV is a self-reported ranking from 1 to 4 (1= not important, 4 = very...

    Started by Luxor‎, 11-30-2016 02:29 PM
    • Replies: 4
    • Views: 157
    12-01-2016, 01:46 PM Go to last post
  14. Which analysis represents better the "worse-ness" of my linear regression?

    Hello all, If I have two sets of data points, for instance: 1 10 2 14 3 17 4 12 5 19

    Started by mode1111‎, 11-28-2016 03:34 PM
    linear regression, statistical analysis
    • Replies: 2
    • Views: 150
    11-29-2016, 07:12 AM Go to last post
  15. P-value for a regression where expected slope is 1:1

    Hi, I am comparing two values for vegetation cover from two time periods. The expected value is y=x for the slope. I am curious how to calculate a...

    Started by drm258‎, 11-23-2016 07:09 PM
    • Replies: 6
    • Views: 239
    11-26-2016, 09:40 AM Go to last post
  16. Repeated measures question

    Hello. I have taken day to day repeated measures in number of predictor variables as well as some other ordinal dvs. I want to meaure the effect of...

    Started by LEMONIAS‎, 11-20-2016 06:56 PM
    • Replies: 4
    • Views: 305
    11-24-2016, 12:39 PM Go to last post
  17. Least squares estimate of alpha and beta

    My group have different opinions towards the following question: Find the least squares estimate of alpha and beta of the mechanistic growth...

    Started by acc_aac‎, 11-24-2016 05:02 AM
    nonlinear regression
    • Replies: 1
    • Views: 131
    11-24-2016, 10:23 AM Go to last post
  18. How to compute r squared in linear mixed model

    It's kind of urgent. i need to hand out my thesis in 3 days from now :/ Can someone explain me how to computer r squared in linear mixed model? i...

    Started by tal_spi‎, 11-24-2016 10:11 AM
    • Replies: 0
    • Views: 87
    11-24-2016, 10:11 AM Go to last post
  19. Standard Regression Analysis / urgent help for stats beginner.

    Hi Guys! I'm fairly new to statistics and am conducting a standard regression analysis with 1 predictor variable ( following from a pearsons...

    Started by Valeriosmith‎, 11-22-2016 06:50 AM
    • Replies: 5
    • Views: 172
    11-22-2016, 12:57 PM Go to last post
  20. Nominal vs. Ordinal

    Say i'm using age groups which are not equal in size and interval (1-2,2-4,5-8years) is it better when using a regression model to set this variable...

    Started by avisev‎, 11-20-2016 04:47 PM
    • Replies: 3
    • Views: 169
    11-21-2016, 04:40 PM Go to last post
  21. Poission with random effects

    Hi, I have two levels in my poission regression model with random effects (children and family level) which predicts count data after i get the...

    Started by avisev‎, 11-20-2016 04:37 PM
    • Replies: 0
    • Views: 93
    11-20-2016, 04:37 PM Go to last post
  22. Help with multilevel multinomial logistic regression and missing data

    Hi all - I would really appreciate some thoughts/advice. I'm working with survey data containing individual responses nested within a number of...

    Started by mattas‎, 11-16-2016 04:42 PM
    • Replies: 0
    • Views: 306
    11-16-2016, 04:42 PM Go to last post
  23. Insignificant interaction effect in regression vs. scatterplot indicating interaction

    Hallo, I'm new to this forum and hope I can make my problem clear. I conducted a multiple regression analysis to, among other things, test the...

    Started by Norbert22‎, 11-16-2016 09:41 AM
    • Replies: 1
    • Views: 138
    11-16-2016, 10:46 AM Go to last post
  24. Exclamation What experimental design would be most appropriate?

    In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

    Started by sylnyapi‎, 11-15-2016 01:18 PM
    • Replies: 0
    • Views: 140
    11-15-2016, 01:18 PM Go to last post
  25. logistic regression or survival analysis?

    Hello, I have two main questions that I hope you help me answer. Let me give you the scenario first. Let’s say that some students in a school are...

    Started by Marvin85‎, 11-14-2016 04:44 PM
    controlling for time, survival analysis, time post
    • Replies: 4
    • Views: 234
    11-15-2016, 10:41 AM Go to last post
  26. Question How to parameterize this crazy data?

    So, a colleague of mine, who is a survey methodologist, is proposing to do an experiment on a survey. * The purpose of the experiment is to see...

    Started by SabbyATL‎, 11-14-2016 07:00 PM
    parameterization
    • Replies: 0
    • Views: 117
    11-14-2016, 07:00 PM Go to last post
  27. Post-Hoc Power Analysis (G*Power) for simple linear regression

    Hey everyone! I conducted a simple linear regression with non-significant results. Now I would like to analyze the power of this calculation using...

    Started by nziza‎, 11-11-2016 07:00 AM
    effect size, g*power, post-hoc, power analysis, simple linear regression
    • Replies: 0
    • Views: 237
    11-11-2016, 07:00 AM Go to last post
  28. Thumbs up Exam pass rate analysis

    Hi, looking for some help with some analysis I am looking at on Minitab for exam pass marks. I have a data set which shows global student...

    Started by iannimmo‎, 11-10-2016 11:38 AM
    • Replies: 1
    • Views: 176
    11-10-2016, 11:47 AM Go to last post
  29. Have 4 dependent and 10 independent variables - which test should I use?

    Hi all, I'm interested in the potential effects of water pollution on feather color of a bird. For this, I calculated 4 color variables for each...

    Started by NatL‎, 11-09-2016 04:47 PM
    dbrda, linear regression, multivariate analysis, permanova, ridge regression
    • Replies: 0
    • Views: 164
    11-09-2016, 04:47 PM Go to last post
  30. please help me make sense of my multilevel linear regression [R]

    Hi everyone, I'm trying to wrap my head around multilevel (or mixed-effect) models, but not quite succeeding. I have the following data from a...

    Started by Junes‎, 11-07-2016 03:46 PM
    multilevel
    • Replies: 0
    • Views: 191
    11-07-2016, 03:46 PM Go to last post
  31. Correlation with residuals of regression

    Hi all, Let's say I have one DV (X) and 5 IV's, A, B, C, D and E. I'm specifically interested in the effect of E. I could perform a regression...

    Started by AnLo‎, 11-04-2016 09:07 AM
    • Replies: 3
    • Views: 267
    11-07-2016, 10:18 AM Go to last post
  32. Red face Test for comparing correlation values. The winner is?

    Hi everyone, my problem is relatively simple, but trivial. I've already read some topics about that, but I really need straightforward answers...

    Started by smndpln‎, 11-05-2016 05:36 AM
    compare coefficients, correlations, neurosciences, regression analysis
    • Replies: 2
    • Views: 275
    11-05-2016, 07:10 AM Go to last post
  33. Urgent: SPSS multiple regression moderator analysis

    Hello everybody, I am glad I found my way to this forum! There seem to be a lot of SPSS pros here! :) I hope I can learn a bit! I am currently...

    Started by PhilST‎, 11-02-2016 01:04 PM
    • Replies: 3
    • Views: 314
    11-03-2016, 04:32 AM Go to last post
  34. Calculating predicted probabilities from a logistic regression model SPSS

    Hello everyone, I am trying to calculate individual predicted probabilities from a logistic regression model with SPSS (to describe how a individual...

    Started by kranas‎, 10-30-2016 01:08 PM
    logistic regression, probabilities
    • Replies: 6
    • Views: 294
    11-01-2016, 04:52 PM Go to last post
  35. Calculation of parameter uncertainties when using method of least squares

    Hi everyone, I am struggling with a maybe simple problem. I have a set of data points (x,y) for which I would like to derive a fitting function of...

    Started by bordercollie2‎, 07-29-2016 05:59 AM
    • Replies: 1
    • Views: 286
    11-01-2016, 05:41 AM Go to last post
  36. Multinomial regression: how to interpret results

    Hello Everyone, I'm currently writing my master's dissertation and i'm having two main issues. 1) The first one is related to the attached...

    Started by GiuliaCarbone‎, 10-30-2016 04:41 PM
    • Replies: 4
    • Views: 231
    10-31-2016, 02:57 PM Go to last post
  37. Help with my hierarchal regression

    Hi Guys I'm accomplishing a hierarchal regression for my thesis and I'm a bit stumped. My hierarchal regression is trying to assess the link...

    Started by lewiss009‎, 10-22-2016 10:05 AM
    • Replies: 3
    • Views: 278
    10-30-2016, 02:51 AM Go to last post
  38. bootstrap regression question

    I have a slightly different twist on the normal application of bootstrapping and regression. Here’s the problem… I have a population of people...

    Started by signalMTB‎, 10-19-2016 09:48 PM
    • Replies: 1
    • Views: 227
    10-28-2016, 09:09 AM Go to last post
  39. Forecast Analysis Inquiry

    Im trying to perform some time series analysis on 2015 and 2016 monthly recorded data to see what method is best for forecasting 2016 monthly values...

    Started by lokelyokel‎, 10-26-2016 09:09 AM
    forecast, forecast error, regression analysis, winters method
    • Replies: 0
    • Views: 169
    10-26-2016, 09:09 AM Go to last post
  40. Which forecast method for a time series like this one?

    Hi everyone, I do have a time series composed by 45 monthly observations and I am trying to figure out which kind of forecasting method is best...

    Started by Mark_‎, 10-11-2016 11:05 AM
    • Replies: 8
    • Views: 329
    10-25-2016, 03:32 PM Go to last post
  41. Relative Weights Analysis | Any good step-by-step guides out there?

    I am trying to conduct relative weights analysis on employee engagement data to prioritize where our org focuses its efforts. I'm running SPSS...

    Started by statsean‎, 10-25-2016 03:03 PM
    relative weights analysis
    • Replies: 0
    • Views: 138
    10-25-2016, 03:03 PM Go to last post
  42. Adding a control increases the impact of focal predictor -- sign of what?

    Hello dear forum members! I have recently been working on a mediation analysis, in which inclusion of an additional variable (say, C1) implies...

    Started by kiton‎, 10-24-2016 11:48 PM
    • Replies: 3
    • Views: 227
    10-25-2016, 11:17 AM Go to last post
  43. How to use Akaike's Information Criterion (AIC) for manual model reduction?

    Hi all, I wondered if anybody can explain to me how I can use the AIC for manual reduction of my GLM. I calculate a GLM with the following...

    Started by Fred.‎, 10-24-2016 07:52 AM
    • Replies: 1
    • Views: 249
    10-24-2016, 11:58 PM Go to last post
  44. Cross-sectional dependence, heteroskedasticity and serial correlation

    *** solved

    Started by Wooly‎, 10-24-2016 03:51 PM
    cross-sectional, econometrics
    • Replies: 0
    • Views: 210
    10-24-2016, 03:51 PM Go to last post
  45. Basic Estimation; Should I use future data?

    Hi everyone, I'm new on the forum but had a question to ask that's related to the work I currently do. I'm wondering if we should include...

    Started by Edorian‎, 10-04-2016 07:54 PM
    • Replies: 4
    • Views: 491
    10-23-2016, 11:24 PM Go to last post
  46. Comparison of one outcome to all the other outcomes

    Here is some data to play with set.seed(1e4) color = factor(c(rep("blue",20), rep("red",20), rep("yellow",150)),...

    Started by Remi‎, 10-23-2016 07:58 PM
    categorical vairable, hypothesis testing, logistic regression, mcmcglmm
    • Replies: 0
    • Views: 135
    10-23-2016, 07:58 PM Go to last post
  47. What p value to use for purposeful selection of variables for multivariate

    To do purposeful selection of variables for multivariate, can I use a p value of 0.15 cut off to select those significant variables from univariate ...

    Started by jm_manipadam‎, 10-23-2016 01:27 PM
    • Replies: 1
    • Views: 226
    10-23-2016, 02:28 PM Go to last post
  48. Is univariate analysis a must before binary logistic regression

    Could I enter all my independent variables directly for a binary logistic regression OR is it necessary that I should run a one way anova for...

    Started by jm_manipadam‎, 10-21-2016 08:19 PM
    • Replies: 8
    • Views: 304
    10-22-2016, 10:27 AM Go to last post
  49. How to handle non normally distributed residuals

    Currently we are working with a GEE model, at this point we are having doubts about our residuals which are not normally distributed. Log...

    Started by Cintia‎, 10-21-2016 10:58 AM
    • Replies: 0
    • Views: 177
    10-21-2016, 10:58 AM Go to last post
  50. Post Help with regression and related nominal values

    Hey all. I'd like some input on a regression analysis. I have data that measures the reactions of individuals to a number of objects and to a number...

    Started by infiniteline‎, 10-15-2016 01:35 PM
    multivariate, nominal variable, regression analysis
    • Replies: 5
    • Views: 292
    10-20-2016, 11:25 AM Go to last post
  51. GLM on non-linear/curvilinear data

    Dear all! I’m sure somebody of you will help me with my non-linear data-problem. I measured a fitness correlate of an animal (response variable)...

    Started by Fred.‎, 09-30-2016 09:54 AM
    anova
    • Replies: 6
    • Views: 444
    10-19-2016, 08:54 AM Go to last post
  52. Defining relation of a fold over design

    Dear All, I am reading the book DC Montgomery on my own. The book says that the defining relation for a foldover design will have L + U - 1 words...

    Started by ashimkapoor‎, 10-18-2016 02:50 PM
    doe
    • Replies: 0
    • Views: 156
    10-18-2016, 02:50 PM Go to last post
  53. Heteroscedastcty with large number of cases

    I ignore here that I have populations commonly :p I have heard that heteroscedastcity is not an issue when you have large sample sizes (I have ten...

    Started by noetsi‎, 10-14-2016 11:45 AM
    • Replies: 10
    • Views: 394
    10-17-2016, 02:21 PM Go to last post
  54. Multiple Regression study

    delete this

    Started by Giaco‎, 10-17-2016 03:52 AM
    • Replies: 0
    • Views: 205
    10-17-2016, 03:52 AM Go to last post
  55. Multicollinearity problem in binary logistic regression

    I'd like to ask for some help with a binary logistic regression. In SPSS I am trying to build a binary logistic regression with 4 independent...

    Started by kranas‎, 10-15-2016 06:20 AM
    logistic regression, multicollinearity
    • Replies: 2
    • Views: 256
    10-16-2016, 02:52 AM Go to last post
  56. Please Help Weird Question

    I have a very weird question which I guess is not replicated hopefully I can get an answer. when using the multiple regression analysis in excel via...

    Started by naderkamal188‎, 10-15-2016 07:35 PM
    • Replies: 1
    • Views: 214
    10-15-2016, 10:42 PM Go to last post
  57. Type 1 error in regression with entire populations

    I have read that you are not supposed to keep choosing different levels of the categorical variable to be the reference level, because this can cause...

    Started by noetsi‎, 10-13-2016 12:55 PM
    • Replies: 14
    • Views: 380
    10-15-2016, 11:50 AM Go to last post
  58. Many predictors relative to cases, want to identify interesting ones

    I've been helping a colleague with his research project. He is looking at the trustworthiness of profile texts. He is analyzing text entries using...

    Started by Junes‎, 10-13-2016 07:49 PM
    exploratory, lasso, linear regression, predictors, stepwise regression
    • Replies: 2
    • Views: 220
    10-14-2016, 03:31 PM Go to last post
  59. Interaction Terms in Linear regression

    In R I used the linear regression call for three variables: y, x, and c Y and X are numeric where C is a dichotomous {0,1}. X and C are the...

    Started by Z-Statistic‎, 10-12-2016 06:49 PM
    • Replies: 1
    • Views: 193
    10-12-2016, 09:48 PM Go to last post
  60. Linear Regression coeffiecients used in Exponential Regression

    I have a decay curve (y) with values 1, 0.75,0.64,0.54,0.46. The x values are 1,2,3,4,5. First a simple linear regression was performed (y =mx + b)....

    Started by Haripi314‎, 10-12-2016 12:36 PM
    exponential regression, linear regression
    • Replies: 0
    • Views: 162
    10-12-2016, 12:36 PM Go to last post

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