data one;
  input hour ph;
  loghour=log(hour);
  cards;
1  7.02
1  6.93
2  6.42
2  6.51
4  6.07
4  5.99
6  5.59
6  5.80
8  5.51
8  5.36
24 5.30
24 5.47
;

proc print;
run;