Dear Sayani,

The following links may be helpful:

http://www.ncbi.nlm.nih.gov/pubmed/26010901

http://www.ncbi.nlm.nih.gov/pubmed/9093672

http://www.jidonline.org/article/S0022-202X(15)32126-6/abstract

http://onlinelibrary.wiley.com/doi/10.1111/gbb.12213/pdf

Rafik

What types are your variables? Are they dichotomous and are you trying to find Pearson correlation between them?

Yes they are dichotomous variables and am calculating correlation in excel (Pearson)

 Thanks Rafik. I looked at the papers. They are all related to genetic studies but I will try to understand. If you find any simple paper discussing this issue then it will be even more helpful.

Calculating Pearson correlation coefficient is not a good idea for your dichotomous variables. If you want a correlation coefficient insistently then you could make use of tetrachoric correlation coefficients to measure association.

To look at difference of associations for those two socio-economic groups you can compare odds ratios (or risk ratios). To do this calculate odds ratio for LSG and HSG and compare them. By making this you control for socio-economic status. Or make a logistic regression say basic education being the dependent variable and others being independent and see what happens.

Dear Sayani,

The following links are related to medical situation (out of the genetic field) and are easy to understand:

http://www.hindawi.com/journals/jpr/2015/608604/

http://europepmc.org/abstract/med/7768372

http://ageing.oxfordjournals.org/content/28/4/367.full.pdf

http://aapgrandrounds.aappublications.org/content/30/3/28

Hoping this will be helpful,

Rafik

Thanks Rafik. These look simpler