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From |
"Biernbaum, Lee" <Lee.Biernbaum@volpe.dot.gov> |

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

Subject |
st: Bizarre praccum behavior |

Date |
Thu, 5 Jul 2007 17:53:01 -0400 |

I have encountered a un-intuitive error when using -praccum- on Stata 9, a command built into the highly useful spost package (specifically, spost9_ado, updated 4 June 2007, from Long and Freese's Indiana University website and paired with the excellent "Regression Models for Categorical Dependent Variables Using Stata" from Stata Press) This command allows one to "accumulate" the various predictions generated by running multiple -prvalue- commands, each designed to come up with the predicted probability of y=#|x. The final time one implements -praccum-, the option -using(matname) gen(varname)- is included in order to generate a series of variables from the matrices -matname- useful for analysis and plotting (e.g. pr(y=0|x=1,2,3,etc.), pr(y=1|x=1,2,3,etc). Pretty nifty, eh? I have written a -forvalues- loop in order to run -praccum- for a series of values. After the loop terminates, I can run the command once more, with the -gen- option and it works fine (see code 1). However, I want to run the same loop with three different output sets (that is, the run x=1,2,3,etc over a few different variables). The situation for all three times is quite similar, so one loop seemed like a good idea (so, yes, I know I can copy/paste in my .do file and, but I want to get this right). The -praccum- runs in the loop fine, creating the three desired matrices. However, after exiting the loop, it will only create the variables via the -gen- command for the first -praccum- listed. It quits with a "type mismatch r(109)" upon the second call. If the data types were right on the 1st call, why wouldn't they be on the 2nd? The order that I run them in does not matter, it only works for the first 1 (see code 2). In my case, I am using these commands following -nbreg-. Any ideas would be appreciated. *****CODE 1******* forvalues counter = 0(1)15 { local cc2 = `counter' ^ 2 local gc2 = `counter' ^ 2 local ic2 = `counter' ^ 2 qui: sum curve_count local c_c = r(mean) qui: sum intersect_count local i_c = r(mean) qui: sum grade_count local g_c = r(mean) qui: sum lnmvmt local m_c = r(mean) local ci_c = `counter' * `i_c' local cg_c = `counter' * `g_c' local mc_c = `counter' * `m_c' qui: prvalue, x(curve_count = `counter' curve_count_sq = `cc2' ci = `ci_c' cg = `cg_c' mc = `mc_c') rest(mean) praccum, using(mat_cc) xis(`counter') } praccum, using(mat_cc) gen(p_cc) ******CODE 2****** ***I am aware there is serious repetition in the local macros, it is intended for clarity**** forvalues counter = 0(1)15 { local cc2 = `counter' ^ 2 local gc2 = `counter' ^ 2 local ic2 = `counter' ^ 2 qui: sum curve_count local c_c = r(mean) qui: sum intersect_count local i_c = r(mean) qui: sum grade_count local g_c = r(mean) qui: sum lnmvmt local m_c = r(mean) local ci_c = `counter' * `i_c' local gi_g = `counter' * `i_c' local cg_c = `counter' * `g_c' local cg_g = `counter' * `c_c' local ci_i = `counter' * `c_c' local gi_i = `counter' * `g_c' local mc_c = `counter' * `m_c' local mg_g = `counter' * `m_c' local mi_i = `counter' * `m_c' qui: prvalue, x(curve_count = `counter' curve_count_sq = `cc2' ci = `ci_c' cg = `cg_c' mc = `mc_c') rest(mean) praccum, using(mat_cc) xis(`counter') qui: prvalue, x(grade_count = `counter' grade_count_sq = `gc2' gi = `gi_g' cg = `cg_g' mg = `mg_g') rest(mean) praccum, using(mat_gc) xis(`counter') qui: prvalue, x(intersect_count = `counter' intersect_count_sq = `ic2' ci = `ci_i' gi = `gi_i' mi = `mi_i') rest(mean) praccum, using(mat_ic) xis(`counter') } praccum, using(mat_cc) gen(p_cc) praccum, using(mat_gc) gen(p_gc) praccum, using(mat_ic) gen(p_ic) ****** End CODE 2 ******* Note1: The program dies when running the 2nd to last line with the error: type mismatch r(109); Note2: the order of the final three lines does not matter. It always exits in the 2nd to last Note3: -matrix list mat_cc- (or mat_gc or mat_ic) contain the desired output, so I know that is not the issue. If necessary, I could save these matrices to variables but given that the command is supposed to do (spost.ado, har har) that already, it would be nice if this could be figured out. Thanks, Lee Biernbaum Economic and Industry Analysis Division US DOT, Volpe Center (617) 494-2834 lee.biernbaum@volpe.dot.gov * * 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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