suppose error term v_t follows Normal(0, V_t) here variance is changing along the time.(adsbygoogle = window.adsbygoogle || []).push({});

Now suppose constant variance of v_t, then v_t ~ N(0, V), but if V is unknown, then V~IG(n/2,d/2)

What is the difference between variance of v_t being constant and variance of v_t being unknown?

Or a better way to state my claim?

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# A constant could have a distribution?

**Physics Forums | Science Articles, Homework Help, Discussion**