Figure 17-3. Linear Velocity Histograms for E. Vernalis in 



Polarized Light (the Data Displayed in Figure 17-2) 



and in Unpolarized Light 



NOTE: Dashed lines denote the estimated mean of each distribution. 



We chose to store statistical parameters within data vectors, rather than 

 merely computing and displaying them, in order to allow them to enter into 

 subsequent calculations. For example, assume the user liad computed statistical 

 parameters for each data vector in a file of instantaneous linear velocities (e.g., 

 the "STAT/VE" example given above); each estimate of the mean is thereby an 

 average for each path. The user may then investigate the distribution of these 

 path averages. The estimated means are first isolated using the STRIP operator: 



*STRI/MN BUGS.ST BUGS.MN. 



The resultant file "BUGS.MN" contains a single data vector; each element of 

 this vector is a mean ("/MN") stripped from one operand data vector. The user 

 may wish to compute statistical parameters for the new set of data, or explore 

 its frequency distribution via histograms (Figure 17-4). The user may also 

 MERGE such files so that each data vector corresponds to a single 

 experimental condition. The vectors may then be compared v^th one another 

 (e.g., one-way analysis of variance, chi-square tests, etc.). 



268 



