How do you rate the IDF?

I can calculate tf-idf for a term for a document. Here tf will be (frequency of term in a document/total terms in the document). Can I do something similar to get tf-idf at corpus level ? I am thinking of a formula like : tf-idf (term) (at corpus level...

I went to see the doctor this morning about some stomach pain I thought might be an ulcer. When the nurse checked my heart rate, it was 48 bpm. Neither the nurse nor my doctor (who knows my med history) said anything about this. I wasn't concerned until...

How are birth rate, death rate, and population growth rate related in the third stage of the Demographic Transition Model?

I thought the slow reaction determined the rate law. Why is this question telling me to do something other than that? So in the first part of the question I calculated the Rate Law from a table, which is "Rate = k [CH3COCH3][H+]." This is the...

Our peak converting month is Dec at 4.81. From there is goes downhill until July when it hits 2.55%. Then it goes back up until Dec. This effects every sampling of conversion rates I do. My experiment has now been live for a week. I can see its average...

I started a website that I sell various products in different shapes and weights. I am trying to come up with a reasonable shipping rate schedule without over/under charging customers. My website is set up to calculate finalized shipping rate at checkout...

I am working on a DCF analyisis, and the growth rate is around 30%. I want to calculate the terminal value, but the textbooks say that this is based on terminal year plus 1 free cash flow, divided by the discount rate minus the growth rate. However,...

When the RBI has a repo rate of 6% and a reverse repo rate of 7.5%, one would expect the overnight call rate among the banks to be somewhere between 6% and 7.5%. I believe the current very low levels of the call rate is because of the RBI using the repo...