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From |
"Naheed Mirza" <mirza@newmail.dk> |

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

Subject |
st: RE: Re: More on passing one value inside a variable to a local macro |

Date |
Sun, 18 Apr 2004 11:04:40 +0200 |

To add to this: what if the variable var2 is string? -summarize- will not help in this case. One possibility is tempvar order gen long `order' = _n su `order' if var2 == "value", meanonly local macroname = var1[`r(min)'] That is, the observation number you need is returned in r(min), and then used to identify the value of -var1-. Another possibility is tempvar true gen byte `true' = var2 == "`value'" sort `true' local macroname = var1[_N] -----Original Message----- From: Naheed Mirza [mailto:mirza@newmail.dk] Sent: 18. april 2004 00:36 To: 'statalist@hsphsun2.harvard.edu' Subject: Re: More on passing one value inside a variable to a local macro Renzo Comolli I don't believe I am confusing the two -if- (although maybe I am, but I don't think so). I want the local macro to take the value of var1 for the same row for which var2 takes a specific value, say 5 or "Texas". I know a priori that var2 will take that value only once, so macroname will end up containing only one number coming from var1. Example, my need is to find a way to do something like passing the GDP of Texas to a local macro. Inside var1 I have all GDPs for each state and inside var2 I have the name of all states. Something like this . local macroname = var1 if var2=="Texas" where I know a priori that Texas will appear only once in var2. If I knew a priori that Texas where in the, say, 22nd observation, then I would just write . local macroname = var1[22] and be done with it. But in the ado I am programming "Texas" can appear at any place. Sorting would not help. While writing for you what I meant with my work-around I understood why it does not work. I am not sure that explaining my mistake would help. I think it would just generate more confusion, so I omit it. >>> One way of doing this su var1 if var2 == <value> local macroname "`r(min)'" If, as you say, the value is unique, then -summarize- will return the same value as, say, r(min) or r(max). An assumption here is that -var1- is not string. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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