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thomas-enzlein committed Aug 17, 2024
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6 changes: 6 additions & 0 deletions manual.Rmd
Original file line number Diff line number Diff line change
Expand Up @@ -181,6 +181,7 @@ The $Log_2FC$ denotes the magnitude i.e. effect size of a response. It is define
$$
Log_2 FC =log_2\frac{a_u}{a_l}
$$

where $a_u$ and $a_l$ the upper and lower asymptotes.
In short: The $Log_2FC$ gives the raw (no variation of data points considered) difference between the upper and lower part of the curve.

Expand Down Expand Up @@ -211,18 +212,23 @@ fcScore=
\frac{|log_2FC|}{log_2FC}
\end{cases}
$$

and

$$
vScore=V'_{mod.}
$$

and

$$
zScore=
\begin{cases}
1 \quad for \quad Z'_{mod.}>0.5\\
\frac{Z'_{mod.}}{0.5} \quad for \quad 0.5 > Z'_{mod.}>-0.5
\end{cases}
$$

The *CRS* combines three measures used to describe the quality of a response curve, the effect size defined as $Log_2FC$ and incorporated in the fcScore, the $V'_{mod.}$ factor being equal to the vScore and the $Z'_{mod.}$ factor used in the definition of the zScore. In the fcScore, the $Log_2FC$ is normalized by and thresholded at $Log_2FC_{max}=2.59$ . The factor is chosen to not overrate features that exhibit substantial changes. The restriction of the $Z'_{mod.}$ factor to the zScore is made due to the common interpretation of the *Z’* factor (Zhang, Chung and Oldenburg 1999). For $Z'_{mod.}>0.5$ a bioassay is said to be excellent, since for $\sigma_l=\sigma_u$ a value of 0.5 is equivalent to a separation of 12 standard deviations between $\mu_u$ and $\mu_l$ . Accordingly, a value of -0.5 is equivalent to a separation of 3 standard deviations between $\mu_u$ and $\mu_l$ for $\sigma_l=\sigma_u$ . The rather moderate lower threshold is in particular of importance for MALDI MS-based bioassay exhibiting a relatively high variance in the data.

### Metrics subtab
Expand Down
6 changes: 6 additions & 0 deletions manual.md
Original file line number Diff line number Diff line change
Expand Up @@ -181,6 +181,7 @@ The $Log_2FC$ denotes the magnitude i.e. effect size of a response. It is define
$$
Log_2 FC =log_2\frac{a_u}{a_l}
$$

where $a_u$ and $a_l$ the upper and lower asymptotes.
In short: The $Log_2FC$ gives the raw (no variation of data points considered) difference between the upper and lower part of the curve.

Expand Down Expand Up @@ -211,18 +212,23 @@ fcScore=
\frac{|log_2FC|}{log_2FC}
\end{cases}
$$

and

$$
vScore=V'_{mod.}
$$

and

$$
zScore=
\begin{cases}
1 \quad for \quad Z'_{mod.}>0.5\\
\frac{Z'_{mod.}}{0.5} \quad for \quad 0.5 > Z'_{mod.}>-0.5
\end{cases}
$$

The *CRS* combines three measures used to describe the quality of a response curve, the effect size defined as $Log_2FC$ and incorporated in the fcScore, the $V'_{mod.}$ factor being equal to the vScore and the $Z'_{mod.}$ factor used in the definition of the zScore. In the fcScore, the $Log_2FC$ is normalized by and thresholded at $Log_2FC_{max}=2.59$ . The factor is chosen to not overrate features that exhibit substantial changes. The restriction of the $Z'_{mod.}$ factor to the zScore is made due to the common interpretation of the *Z’* factor (Zhang, Chung and Oldenburg 1999). For $Z'_{mod.}>0.5$ a bioassay is said to be excellent, since for $\sigma_l=\sigma_u$ a value of 0.5 is equivalent to a separation of 12 standard deviations between $\mu_u$ and $\mu_l$ . Accordingly, a value of -0.5 is equivalent to a separation of 3 standard deviations between $\mu_u$ and $\mu_l$ for $\sigma_l=\sigma_u$ . The rather moderate lower threshold is in particular of importance for MALDI MS-based bioassay exhibiting a relatively high variance in the data.

### Metrics subtab
Expand Down

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