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The null hypothesis in these tests is μ ij = 0, where μ ij is the average abnormal return for portfolio i on day j.
Panel A provides the standard deviation for the relevant day and portfolio/decile, and the corresponding p-value for the null hypothesis ( {sigma}_{ij}^2={sigma}_i^2 ), where ( {sigma}_{ij}^2 ) is the variance of portfolio i on day j and ( {sigma}_i^2 ) is the variance of portfolio i across all days of the week.
Using a chi-square distribution Panel A of Table 1 also reports p-values for the null hypothesis ( {sigma}_{ij}^2={sigma}_i^2 ), where ( {sigma}_{ij}^2 ) is the variance of portfolio i on day j and ( {sigma}_i^2 ) is the variance of portfolio i across all days.
I'm not micromanaging his portfolio, I assure you.
"If you look at the portfolio, I think we have regained leadership," says Mr Kallasvuo.
"I haven't got a portfolio; I am my portfolio," says the corpulent Mr. Kessel.
It's a portfolio I could not have as a stock company.
Other than a few cats in our portfolio, I almost always bring understudies".
As vice president responsible for our product portfolio, I was always on the lookout for software we could use.
As I walk briskly between advisers' offices, tucking forms into my leather portfolio, I realize that I love this.
If you build up your patent portfolio, I build up mine nukes pointing at each other," says Mr Papadopoulos at Sun Microsystems.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com