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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?

As my title implies, there is a discrepancy between Geogebra, Excel, Desmos, and TI-83 Plus. Let me explain myself I have created a fifth and...

• Replies: 3
• Views: 2,290
02-21-2015, 08:09 PM
2. ### Checking homoscedasticity in repeated measures

Hello, When checking the assumption of constant variance for repeated measures data, am I correct in thinking that the variance of residuals...

• Replies: 0
• Views: 1,460
02-18-2015, 11:36 AM
3. ### Conditional logistic regression- effect of modifiers

Hi everybody, I am new here in this forum. I am studying the effect of air pollution (PM) on health outcomes, and the characteristics that might...

• Replies: 0
• Views: 1,590
02-18-2015, 03:18 AM
4. ### Multiple regression where only part of the sample completed the follow up survey

Hi, For my dissertation I trying to determine whether several emotions predict behavioural intention and behaviour. Participants were asked to...

• Replies: 0
• Views: 1,213
02-16-2015, 03:33 PM
5. ### Interaction between binary and continuous variable in OLS

I am trying to examine the association between maternal education and child school test scores using the following equation. TestScore = β0 + β1...

• Replies: 3
• Views: 2,183
02-16-2015, 08:09 AM
6. ### Regression / modelling help

Hi All, I'm new here so If I've posted this in the wrong place or its not practical then I apologise. I'm new to regression so helpfully Im...

• Replies: 5
• Views: 2,421
02-15-2015, 08:45 PM
7. ### 2sls regression

hi, what be the consequenses of using the same explanatory variables in a simultaneous equations system? for example if both the supply and the...

• Replies: 0
• Views: 1,353
02-15-2015, 11:51 AM
8. ### regression analysis reporting: chemist needs help!

Hello, everyone. We have some regression data we'd like to report, but aren't sure how to best do so. Here's the situation: A lab analyst runs a...

• Replies: 0
• Views: 2,597
02-15-2015, 10:28 AM
9. ### how to draw a logistic curve in word, excel etc

Hello, I am working on a binary logistic regression and would like to insert the logistic sigmoid curve. do you know how to draw such a curve in...

• Replies: 0
• Views: 3,014
02-14-2015, 08:32 PM
10. ### Design question: proportion explained variance by placebo effect

Dear all, I have a design question about investigating a placebo effect. Does anyone have a clue how to analyze the proportion explained variance...

• Replies: 2
• Views: 1,281
02-13-2015, 04:23 AM
11. ### Error Propagation in Separate Binomial Logistic Regressions

On http://en.wikipedia.org/wiki/Multinomial_logistic_regression#Introduction is written, that the estimation errors of separate binomial logit models...

• Replies: 0
• Views: 840
02-12-2015, 03:08 PM
12. ### correct regression model for dependent variable

Hi all, I am new to this forum and I hope that the qestions that are bothering me can be answered together with your help. I have data (N=220)...

• Replies: 11
• Views: 2,359
02-12-2015, 08:47 AM
13. ### risk of using group level variables to predict individual outcomes in regression

Hi, GOAL: I have been running a multivariate linear regression to predict student outcomes (grades; at the individual student level) from several...

• Replies: 0
• Views: 1,264
02-10-2015, 08:09 PM
14. ### Linear Regression (Age Interval, 10 years)

Hi guys, I initially ran a linear regression, however we found that age (by year) generated a negligible B coefficient. In response we...

• Replies: 5
• Views: 1,468
02-10-2015, 08:54 AM
15. ### F-Test for SLR & MLR?

I am trying to finish a homework problem for a grad level stats class and can't seem to find an answer anywhere to this question written in plain...

• Replies: 1
• Views: 1,838
02-10-2015, 02:09 AM
16. ### Interpretation of linear-log regression model (Neep Help)

Dear All, I had a problem with my data of growth in percentage regarding negative and positive values due to which I could not transform it into...

• Replies: 2
• Views: 1,623
02-09-2015, 01:46 PM

Hey People Im currently learning to use multivariate analysis in my PhD project, and have an Abstract deadline and a Statistician on holiday so I...

• Replies: 0
• Views: 1,245
02-09-2015, 08:06 AM
18. ### Writing R^2 strictly in terms of simple correlations among variables

Say we have the following regression Y_i=\beta_0+\beta_1X_{1i}+\beta_2X_{2i}+\epsilon_i I want to write the multiple R^2 for this regression...

• Replies: 8
• Views: 3,169
02-07-2015, 07:06 PM
19. ### Ambulance utilisation: help choosing a method

Hi, I need some advice in selecting a statistical test please. I am researching ambulance utilisation rates at a population level (defined by a...

• Replies: 8
• Views: 1,935
02-06-2015, 04:57 AM
20. ### Must categorical variables always be dummy coded in linear regression?

My question is must we always dummy code categorical variables in linear regression. What if I wanted to understand the overall effect of a...

• Replies: 2
• Views: 2,108
02-06-2015, 04:43 AM
21. ### Regression Model is not full rank

Hi all, I am trying to detect relationship of crop yield at the end of the growing seasson (1 dependent variable) using amount of precipitation in...

• Replies: 3
• Views: 15,262
02-06-2015, 03:08 AM
22. ### Fixed term is “(Intercept)” --Dredge function

Hi, i'm currently running a glm model in R and have attempted to use the following code: Model:...

• Replies: 2
• Views: 6,067
02-05-2015, 11:08 PM
23. ### Which Blood Pressure Tool better predicts kidney function: help choosing test.

Hi there, I am trying to see whether there is an advantage of using one blood pressure tool over another at predicting kidney function. Both...

• Replies: 1
• Views: 1,239
02-05-2015, 10:12 PM
24. ### Strategies for managing multicollinearity in hierarchical regression

Strategies for managing multicollinearity in hierarchical regression Hi, I am doing a thesis project that involves using hierarchical multiple...

• Replies: 0
• Views: 835
02-04-2015, 07:13 PM
25. ### range of possible values for regression coefficients given another one?

i feel like the answer to my question is a 'no' but i'll ask it anyway just to be absolutely sure. say you have 3 variables X, Y and Z each one...

• Replies: 3
• Views: 1,781
02-04-2015, 04:11 PM
26. ### How to check if vector is close to space spanned by 2 basis vectors (lin. regression)

Here is the situation: I have measured gene expression data for cells that have been subjected to three different stimuli. This means I have 3 long...

• Replies: 0
• Views: 978
02-04-2015, 10:48 AM
27. ### Logit regression interaction/moderation: what to do about it?

Hi all! I have a multivariable logit regression model that has two terms showing two-way interaction (the interaction also makes biological...

• Replies: 3
• Views: 1,605
01-31-2015, 11:24 PM
28. ### Linear and Non-Linear three parameter Regression Analysis questions.

Hello All A short warning for a very long post! Im currently working on my master thesis in mechanical engineering. I need to do, for me, an...

• Replies: 0
• Views: 1,241
01-31-2015, 09:19 AM
29. ### Meta Analysis with Several Regression Studies

Hi folks, this is my first post. I'm encountering a class of problems that I do not know how to solve. If anyone out there can give me any book...

• Replies: 0
• Views: 1,244
01-28-2015, 04:20 PM
30. ### Regression help needed

Hi members, Is there anyone who would be willing to give me 5 hours during the day sometime of some regression / modelling help. Im happy to pay...

• Replies: 0
• Views: 1,223
01-28-2015, 07:03 AM
31. ### re: basic question on why my predictor is not significant?

I am puzzle by why my predictor was not significant so I would like to seek your expertise. My regression model does not provide significant on the...

• Replies: 3
• Views: 1,469
01-28-2015, 12:04 AM
32. ### Unobserved heterogenity

This is a signficant problem potentially for Cox and logistic regression. I have never found a test for whether it exists. I doubt there is one, but...

• Replies: 16
• Views: 3,749
01-27-2015, 02:01 PM
33. ### Doing correct backwards elimination with interaction terms?

I'm wondering about this, and I can't find an answer anywhere. My textbook (Agresti and Finlay 2009) clearly says how to do backwards elimination on...

• Replies: 15
• Views: 6,920
01-27-2015, 10:27 AM
34. ### cox regression

This is interested in surival time to an event and deals with time series data inherently, including the use of lagging indicators in some cases....

• Replies: 1
• Views: 1,188
01-25-2015, 03:01 PM
35. ### Binary Logistic Regression and Generalised Linear Model

I have basic understanding of statistics and am trying to interpret the output of a generalised linear model. The data used in my analyses...

• Replies: 4
• Views: 1,575
jle
01-22-2015, 09:43 PM
36. ### mixed effect models in R using glmer

Folks, I'm looking for a very basic introduction to mixed effect models in a health care context. Suggestions welcome. Thanks

• Replies: 5
• Views: 1,576
01-21-2015, 07:42 PM
37. ### Anyone familiar with this statistical paradox?

I have discovered an interesting statistical paradox. If you familiar with it, please, let me know about its conventional name (or author's name) and...

• Replies: 0
• Views: 1,245
01-20-2015, 04:25 AM
38. ### Help on interpreting linear regression

I'm currently working on a larger assignment, and I need some input how to interpret the results from my/a linear regression. I'm pretty sure I get...

• Replies: 1
• Views: 1,770
01-18-2015, 09:56 AM
39. ### What type of regression I need to use?

:confused: I am doing a medical research in which I am going to compare two methods of calculation of RBC life span. The older method is a...

• Replies: 1
• Views: 1,328
01-16-2015, 02:23 PM
40. ### Probit regression with misclassified binary dependent variable in R

Is there a generalized linear mixed-effects model implementation for R that could handle misclassified binary data? Unless I have overlooked...

• Replies: 0
• Views: 1,600
01-16-2015, 09:35 AM
41. ### Simple Linear Regression - Many Data Sets

We have to predict a future value for one variable based solely on past instances of that variable. This has to be done for many different data...

• Replies: 0
• Views: 1,010
01-15-2015, 02:50 PM
42. ### Finding a patch in a series.

Hello! I wonder if anybody can help me. I am working on a personal project and I want to find the best match for a patch in a larger series. I...

• Replies: 0
• Views: 1,158
01-15-2015, 01:11 AM
43. ### Do I need to control for Type 1 errors?

Hi guys, the situation I have is, a reviewer has asked me to reduce my mediation model (MPLUS) as he says I have too many tests going on. In fairness...

• Replies: 5
• Views: 2,267
01-14-2015, 03:09 PM
44. ### Regression: cor(X1, Yhat) = cor(X1, Y)/R How to show?

Hello everyone. I am taking a class in regression that's way over my head. We are working with the sample model Y = b0 + b1X1 + b2X2 + e. In it I am...

• Replies: 3
• Views: 2,655
01-14-2015, 02:02 AM
45. ### Comparing different, related measures of the same thing to see which is most sig?

I want to start out saying my stat knowledge is weak. I am writing my Masters thesis and I'm struggling to understand how to get the answers I want....

• Replies: 1
• Views: 1,233
01-11-2015, 02:17 AM
46. ### SE MultiLevel Models

Not accounting for dependence in observations and not using the appropriate cross-sectional multilevel model results in parameter estimate's standard...

• Replies: 1
• Views: 1,119
01-10-2015, 09:46 PM
47. ### Unbalanced panel dataset

I need some clarification on how unbalanced panel data should be organized. For instance, suppose you have sample of total N products' prices and...

• Replies: 0
• Views: 1,023
01-10-2015, 07:25 PM
48. ### Data problem

I need a little help about a guidance how to represent "unlimited" as a value in regression variable. For example, some phone plans includes...

• Replies: 2
• Views: 1,412
01-09-2015, 07:34 PM

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