Change x axis labels from f to 1/f values

[Anna Zahoruiko]

Dear researchers,

Could you advise if there is any way to plot periodogram with labels of an x-axis, not in f but 1/f values?
I'm trying to perform spectral analysis and periodogram with a number of years/period on the x-axis is more informative than with frequencies.

Thank you in advance for any ideas and sorry if such question has been already asked.

[Nick Cox]

Yes. See e.g. http://www.statalist.org/forums/foru...-actual-values and its references.

[Anna Zahoruiko]

Thank you for the links.

However, I do not really understand what I am doing wrong.

My code looks as follows:

. mylabels 0 (0.10) 0.50, myscale(1/@)  local(xla)
. "0" 10 ".1" 5 ".2" 3.333333333333334 ".3" 2.5 ".4" 2 ".5"

. pergram magrgdp, xla(`xla') generate (mapergram) recast (line)

And still labels of x axis do not change but rather the whole graph changes as follows:



Thank you in advance for any advise.

[Nick Cox]

You seem have labels and values the wrong way round. Your function is defined over about 0 to 0.5 but you want see reciprocals. Consider

mylabels 2 5 10 20 40, myscale(1/@) local(xla)

[Anna Zahoruiko]

I see my mistake now.

Thanks a lot, now it works!