Linked Questions

5 votes
1 answer
8k views

Need help understanding what a natural log transformation is actually doing and why specific transformations are required for linear regression [duplicate]

I’m taking an online “Intro to AI” course for which I’m doing some azure machine learning labs. This course is largely about how to apply azure ML solutions and, while there is an “essential math for ...
redmondcoffehead's user avatar
1 vote
1 answer
54k views

What are the advantages of using log GDP per capita versus simple GDP per capita when analyzing economic growth? [duplicate]

I have quite a lot to learn regarding analysis and economics, one thing I have noticed is that when analyzing growth, log is used quite often, why is this so?
recentgrad's user avatar
1 vote
1 answer
8k views

How do I know when I should use a log transformation on a variable by multiple regression? [duplicate]

I am very new to regression analysis. I have a dependent variable and 9 independent variables. I want to build the best possible model from them, and I don't know when to log transfrom a variable.
kanbhold's user avatar
  • 865
2 votes
2 answers
5k views

When does it make sense to log-transform input variables in multi-variable logistic regression? [duplicate]

When does it make sense to log-transform input variables in multi-variable logistic regression? The transformation improves model metrics a little bit, but I'm not sure how to justify it and whether ...
David D's user avatar
  • 727
4 votes
1 answer
3k views

Why are time-related covariates log transformed in modelling? [duplicate]

I have seen a lot of examples of transforming time-related variables (e.g., age, year, days, etc.), but I don't understand the reasoning behind doing this. I don't think it's for stabilizing the ...
Verbal's user avatar
  • 193
4 votes
1 answer
2k views

How do I know when to use log-transformation? [duplicate]

I am quite new to econometrics and still struggle with recognizing when to use the log-transformed variable or just stick with the nominal form. From what I gathered, it has to do with getting closer ...
Ivana's user avatar
  • 41
2 votes
1 answer
2k views

Is it necessary to log transform positively skewed DV’s even though I am using bootstrapping? [duplicate]

Possible Duplicate: In linear regression, when is it appropriate to use the log of an independent variable instead of the actual values? I am running a series of multiple mediation models. Each ...
Jenny's user avatar
  • 21
1 vote
3 answers
759 views

Why is it okay to take the log (or any other transformation) of the dependent variable? [duplicate]

Why is it common practice to take the log of the dependent variable Y? To be clear, I understand that under appropriate circumstances that taking the log can help normalize the distribution/linearize ...
shell's user avatar
  • 11
0 votes
0 answers
814 views

Justification of the log transformation of independent variables [duplicate]

I have used the following negtaive binomial model: ...
Simpson's Paradox's user avatar
3 votes
2 answers
200 views

Why do we log variables if normality is not required? [duplicate]

I recently learned log-transforming a variable and it helps when our data is skewed. But, I also learned that the normality assumption of the data/variables is not required. The only requirement is ...
chunguc1004's user avatar
1 vote
1 answer
272 views

Is it allowed to log a already (logged)transformed continuous variable for low skewness? [duplicate]

I wonder if it is allowed to log a variable which is already logged (transformed). When I do this, the skewness of my model goes to 0.05 which is quite good. Let me know! Thanks in advance :)
user avatar
1 vote
0 answers
175 views

Should I use log transformation for my linear regression? [duplicate]

I am modeling commissions earned based on non sales data. My equation looks like this: commissions = Number of times logged into the system + ... (many binary ...
Jay's user avatar
  • 11
0 votes
0 answers
162 views

Logarithmizing IV in logistic regression analysis? [duplicate]

I am doing logistic regression to assess the influence of a novel parameter on the risk for a certain disease and I have 2 questions: (1) Is it appropriate to logarithmize one or more independent ...
martin.l.'s user avatar
0 votes
0 answers
157 views

When to apply logarithmic transformation to a variable? [duplicate]

My question is in which cases you should think about transforming your variable into a logarithmic one? My dependent variable in the number of patents a long a period of years and one of my ...
Nitzan's user avatar
  • 371
0 votes
0 answers
67 views

Which skewness/kurtosis figure do I use in a spatial regression analysis [duplicate]

Possible Duplicate: In linear regression, when is it appropriate to use the log of an independent variable instead of the actual values? I'm currently conducting a spatial regression analysis. I'...
Ben Coleman's user avatar

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