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From |
"Philip Ryan" <philip.ryan@adelaide.edu.au> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: How do I create a loop that calculates new variables by performing the simple mathematical function of subtracting one varlist on another varlist? |

Date |
Mon, 9 Jan 2012 13:58:56 +1030 |

<<>> I think the only potential problem here is the zero left padding of the numeric suffix of the variable names. Try this: forvalues i=1/73 { local suffix cond(`i' < 10,"00`i'","0`i'") gen h7a`suffix' = h7r`suffix' - h7t`suffix' } Phil Philip Ryan Professor and Director Data Management & Analysis Centre [DMAC] University of Adelaide -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Saporito, Salvatore J Sent: Monday, 9 January 2012 1:18 PM To: statalist@hsphsun2.harvard.edu Subject: st: How do I create a loop that calculates new variables by performing the simple mathematical function of subtracting one varlist on another varlist? I am trying to subtract one sequential list of variables (e.g., a1 to a73) from another sequential list (e.g., b1 to b73) using a loop statement such as the "foreach..." I am trying to avoid repeating the same, simple function (in this case 73 times). Specifically, I want a loop that repeats this: gen h7a001=h7r001-h7t001 gen h7a002=h7r001-h7t002 to gen h7a073=h7r003-h7t073 Simple question but I am trying to learn Stata so that I can use the power of its programming capabilities. This particular challenge eludes me. Thanks, Sal * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/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/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: How do I create a loop that calculates new variables by performing the simple mathematical function of subtracting one varlist on another varlist?***From:*"Saporito, Salvatore J" <sjsapo@wm.edu>

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