Dataset:  spf_substrate.csv

Source: S. Miksa, D. Lutz, C. Guy (2013). "In vitro/vivo Correlation and
Repeatabilty According to Substrate," Cosmetics and Toiletries, Vol. 128,
#9, pp. 648-657.

Description: Results of in-vivo SPF assessments and in-vitro assessments (based
on 3 different substrates) for 32 suncreen products. Assessments were based
on 18 samples. Substrate 1 = MPP(HD6), Substrate 2 = MSSP (SMS), 
substrate 3 = SPP (SDB)
MPP = Molded polymethyl methacylate (PMMA) plates
MSSP = Molded skin-mimicking PMMA plates
SPP = sand-blasted PMMA plates
Models fit were regressions through the origin of each in/vitro (Y) on
in-vivo(X) across all 32 products.

Variales/labels
sunscreen product   (Product)
In-vivo mean     (SPF1)
In-Vivo SD       (SD1)
In-vivi CV       (CV1)
In-Vitro MPP mean   (SPF2)
In-Vitro MPP SD     (SD2)
In-Vitro MPP CV     (CV2)
In-Vitro MSSP mean   (SPF3)
In-Vitro MSSP SD     (SD3)
In-Vitro MSSP CV     (CV3)
In-Vitro SPP mean   (SPF4)
In-Vitro SPP SD     (SD4)
In-Vitro SPP CV     (CV4)