```Date: Thu, 19 Dec 2002 14:08:18 +1100 Reply-To: rangarajan Sender: "SPSSX(r) Discussion" From: rangarajan Subject: WHY DIFFERENT n's Content-Type: text/plain; charset="us-ascii" Hi; I ran the following syntax and i get two different valid N's . could somebody explain why is it so. I am using the same formula in two syntax but when i run frequency procedure at different stages the out put is different. syntax one: SEL IF (I1110188 GT 100 AND I1110288 GT 100). compute posteq87=(i1110288*100/100.1)/(d1110687**0.5). COMPUTE PREG87=(I1110188*100/100.1)/(D1110687**0.5). FREQUENCIES VARIABLES= preg87 posteq87 /FORMAT=NOTABLE /STATISTICS=MEAN MEDIAN. SEL IF (I1110189 GT 100 AND I1110289 GT 100). compute posteq88=(i1110289*100/101.4)/(d1110688**0.5). COMPUTE PREG88=(I1110189*100/101.4)/(D1110688**0.5). FREQUENCIES VARIABLES= preg88 posteq88 /FORMAT=NOTABLE /STATISTICS=MEAN MEDIAN. Syntax two: SEL IF (I1110188 GT 100 AND I1110288 GT 100). compute posteq87=(i1110288*100/100.1)/(d1110687**0.5). COMPUTE PREG87=(I1110188*100/100.1)/(D1110687**0.5). SEL IF (I1110189 GT 100 AND I1110289 GT 100). compute posteq88=(i1110289*100/101.4)/(d1110688**0.5). COMPUTE PREG88=(I1110189*100/101.4)/(D1110688**0.5). FREQUENCIES VARIABLES=PREG87 POSTEQ87 PREG88 POSTEQ88 /FORMAT=NOTABLE /STATISTICS=MEAN MEDIAN. I hope somebody will be able to enlighten me why differences in the output. Thanks in advance. rangarajan ```

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