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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

Subject |
st: RE: Conformability error in creating matrix while cross-tabulating data |

Date |
Thu, 5 Jul 2007 16:40:00 +0100 |

Consider what happens first time round the loop. i is set to 271 and you ask Stata to put a value in results[271, 1]. As you only set up a matrix with 7 rows, this won't work. You don't need to -rename- your variables, you just need local I = `i' - 270 matrix results[`I', 1] = ... and so forth. Nick n.j.cox@durham.ac.uk Hugh Colaco > I am trying to get the frequency of certain variables and put it in a > matrix (see code below). I need to cross tabulate each variable > q271-q277 with each variable q256-q260. I then need to add the > frequencies of q256-q258 as one group and q259-q260 as the other > group. Finally, I want to create a 7 x 2 matrix of the results > (q271-q277 will be the 7 rows; and q256-q258 & q259-q260 will be the 2 > columns). > > I ran the following code, but am getting "conformability error". I > think the problem is that I want a 7 x 2 matrix, but I'm using i = > 271/277 rather than i=1/7. If this is the case, can you suggest an > alternative? > > P.S. - Right now, I have variables q1-q7. I tried to drop them and > rename q271-q277 as q1-q7 (in case this was the issue), without much > luck. > > Thanks, > > Hugh > > > matrix results = J(7,2,.); > > forval i = 271/277 {; > count if q`i'~=. & q256~=.; > local a = r(N); > count if q`i'~=. & q257~=.; > local a = `a' + r(N); > count if q`i'~=. & q258~=.; > matrix results[`i',1] = `a' + r(N); > > > count if q`i'~=. & q259~=.; > local b = r(N); > count if q`i'~=. & q260~=.; > matrix results[`i',2] = `b' + r(N); > > }; > > matrix colnames results = NP FP; > matrix rownames results = q271 q272 q273 q274 q275 q276 q277; > matrix li results, noheader; * * 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/

**References**:**st: Conformability error in creating matrix while cross-tabulating data***From:*"Hugh Colaco" <hmjc66@gmail.com>

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