simple linear regression with proportion data

-----Original Message-----

Can I use simple linear regression when I have proportion data
for both dependent and independent variables?  Or, should I use
beta regression analysis?  Or any suggestion?

The distribution of the independent variable is irrelevant (in some
circumstances it matters whether it is measured without error or
not).

Agreed that if you just want a line that goes somewhere near the data
you can do pretty much anything. But don't those circumstances you
referred to include 'any time you want an unbiased estimate of the
slope or a reliable standard error on coefficients'?