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From |
Paul Byatta <paulbyatta@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: standardizing scores by cohort |

Date |
Wed, 24 Apr 2013 15:21:12 +0300 |

thanks, a lot. On Wed, Apr 24, 2013 at 2:32 PM, Nick Cox <njcoxstata@gmail.com> wrote: > Statalist software here can't represent the equals sign = in your post > correctly. I guess that, contrary to request, you are not sending > plain text to the list. > > That aside > > egen mean_math = mean(math), by(yoa) > egen sd_math = sd(math), by(yoa) > gen std_math = (math - mean_math) / sd_math > > should be simpler than the dreaded alternative. Note that a -by()- > option is supported, although not documented, by -egen-'s -mean()- and > -sd()- functions, but your indicated syntax > > ... by yoa > > certainly would not work. > > Nick > njcoxstata@gmail.com > > On 24 April 2013 12:15, Paul Byatta <paulbyatta@gmail.com> wrote: > >> I am trying to standardize raw >> scores for several cohorts of students based on year of admission to high >> school. >> >> My data looks like this >> >> >> StudentID Year of math >> Admission (yoa) >> >> 1 2004 78 >> 2 2004 83 >> 3 2004 99 >> 4 2005 58 >> 5 2005 68 >> 6 2005 67 >> 7 2006 87 >> 8 2006 75 >> 9 2006 56 >> >> It would have been easier to use >> >> >> egen std_math =3D std(math) by yoa >> >> But then egen doesn=92t go with =93by=94 in this case. >> >> Anybody with a suggestion of how standardize the scores without having to >> through the long process that is (below) and combining the generated >> variables to get std_math? >> >> >> >> egen std_math4 =3D std(math) if yoa=3D=3D2004 >> egen std_math5 =3D std(math) if yoa=3D=3D2005 >> egen std_math6 =3D std(math) if yoa=3D=3D2006 >> > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**References**:**st: standardizing scores by cohort***From:*Paul Byatta <paulbyatta@gmail.com>

**Re: st: standardizing scores by cohort***From:*Nick Cox <njcoxstata@gmail.com>

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