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From |
"Terra Curtis" <terra.curtis@cambridgefinance.com> |

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

Subject |
st: [ ] notation |

Date |
Tue, 9 Aug 2005 16:22:10 -0400 |

Dear Statalist, I am running into some problems trying to run a nonlinear regression. I continue to get error 480 "starting values invalid or some RHS variables have missing values." I think I see where my error is but I'm not sure how STATA deals with a reference, say 'by varname: data[x]' if x is out of the range of data for that varname. Here is my code: I have written a program to specify the nonlinear equation, and that is where the error is: program nlstk2_depreciation version 8.1 if "`1'" == "?" { global S_1 "B3 B4 B5 drd2 dmktg2" global B3=1 global B4=1 global B5=1 global drd2=0.15 global dmktg2=0.15 exit } forvalues x=10/53 { by coname: replace `1'=$B3+$B4*(ireal46[`x'] + (1-$drd2)*ireal46[`x'-1] + (1-$drd2)^2*ireal46[`x'-2] + (1-$drd2)^3*ireal46[`x'-3] + (1-$drd2)^4*ireal46[`x'-4] + (1-$drd2)^5*ireal46[`x'-5] + (1-$drd2)^6*ireal46[`x'-6] + (1-$drd2)^7*ireal46[`x'-7]+ (1-$drd2)^8*ireal46[`x'-8] + (1-$drd2)^9*ireal46[`x'-9]/$drd2) + $B5*(imktg[`x'] + (1-$dmktg2)*imktg[`x'-1] + (1-$dmktg2)^2*imktg[`x'-2] + (1-$dmktg2)^3*imktg[`x'-3] + (1-$dmktg2)^4*imktg[`x'-4] + (1-$dmktg2)^5*imktg[`x'-5] + (1-$dmktg2)^6*imktg[`x'-6] + (1-$dmktg2)^7*imktg[`x'-7] + (1-$dmktg2)^8*imktg[`x'-8] + (1-$dmktg2)^9*imktg[`x'-9]/$dmktg2) if `x'==year } end I have panel data for companies over a period of years, although each company has a different amount of years of data (no company has more than 53 years of data). If a company has 10 years of data, I want the regression to use all 10 years of data. If it has more than 10 years of data, I want it to use the most recent 10 (say, years 1990-1999), then use the next 10 (years 1989-1998), and so on until it gets to the last set of 10 years for that company. I think the logic of the equation I have written works out, so I'm guessing the error is coming from some referencing problem in the brackets...I don't quite understand how STATA would deal with ireal46[49] if some company didn't have a 49th ireal46 entry. Any insights? Thanks, Terra * * 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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