Top 30 List - Better Valued?

Every few months I try to "score" the top 30 stocks to get a feeling whether they are "cheaper". You can't really look at averages, so I tend to focus on the median. Here are my rankings of the top 30 stocks:

Stock	EY	ROC	EY Rank	ROC Rank	Sum
snta	52%	1354%	1	3	4
pdli	22%	145094%	9	1	10
qcor	18%	10939%	11	2	13
cytk	29%	707%	5	10	15
elnk	44%	658%	2	14	16
endp	18%	821%	13	7	20
vclk	17%	967%	16	5	21
eme	23%	343%	7	15	22
solr	16%	689%	17	11	28
usmo	41%	153%	3	25	28
vsnt	14%	914%	23	6	29
tsra	18%	279%	12	17	29
prgx	18%	321%	14	16	30
ppd	19%	188%	10	21	31
jcom	15%	672%	19	13	32
khd	24%	140%	6	26	32
ueps	11%	1275%	29	4	33
rgr	30%	103%	4	29	33
chke	13%	725%	26	9	35
immu	12%	738%	28	8	36
untd	16%	255%	18	18	36
cf	22%	109%	8	28	36
lo	13%	674%	27	12	39
frx	18%	155%	15	24	39
dyai.pk	14%	251%	21	19	40
dlx	14%	185%	22	22	44
idcc	15%	122%	20	27	47
jtx	14%	171%	25	23	48
she	10%	199%	30	20	50
cbi	14%	99%	24	30	54

Now comparing the scores at various points in time:

Date	Statistic	EY	ROC
January 8 2010	Median	17%	332%
	Average	46%	770%
November 6th	Median	16%	229%
	Average	37%	588%
July 31st	Median	20%	212%
	Average	45%	740%
April 16th	Median	27%	228%

Obviously, April 2009 was in hindsight a great time to buy. The 27% median earnings yield is off the charts. It then dropped to 20% at the end of July and 16$ in November. It has bounced back up to 17%. Interestingly, the median ROC is at the highest point. Perhaps it is still a good time to buy?

I think the stock that intrigues me when I look at the list is VCLK. I don't know that much about them, but they are right at the top.