refine rqs

2-slr-procedure.tex

@@ -1,21 +1,49 @@
 \section{Systematic Review Procedure}
 
-To carry out the systematic review,
+To carry out the systematic review of GitHub pull request,
 we followed the established guideline from prior studies~\cite{}.
 Specifically,
 the procedure consists of the following four steps.
 
 \subsection{Question formulation}
 
-The following three research questions:
+Our research purpose is to \textit{identify, summarize and synthesize the research topics and metrics studied in relation to GitHub Pull request}.
+To achieve this, 
+we have defined the following as our main research questions.
 
-\textbf{RQ1: What is trend in the study of GitHub pull requests?}
 
-\textbf{RQ2: What topics have been studied in relation to GitHub pull requests?}
 
-\textbf{RQ3: What metrics have been used to study GitHub pull requests?}
+\vspace{1em}
+\noindent\textbf{RQ1: What is trend in the study of GitHub pull requests?}
+
+\textit{Motivation:} 
+We expect to present the ** of primary studies 
+by ** their publication year, venue and research type.
+This can ***.
+
+
+\vspace{1em}
+\noindent\textbf{RQ2: What topics have been studied in relation to GitHub pull requests?}
+
+\textit{Motivation:} 
+We aim to create a systematic view of existing research topics about GitHub pull request,
+and build a research map revealing 
+what topics have been studied 
+and to which extent these topics have been investigated,
+and what topics receive no attention yet from the research community.
+This benefits researchers interested in GitHub pull request to 
+by providing a readily-available summary of prior related studies,
+and pointing to potential research directions.
+
+\vspace{1em}
+\noindent\textbf{RQ3: What metrics have been used to study GitHub pull requests?}
+
+\textit{Motivation:} 
+We hope to construct a complete list of metrics related to GitHub pull request, 
+which can act as a reference and guidance for feature selection in future research.
+
+
 
-\textbf{RQ4: How many pull requests are used for the study?}
 
 \subsection{Literature search}
 

4-research_topic.tex

@@ -66,10 +66,10 @@
 
 		\multirow{2}*{dataset}
 		& & Dataset &  \\
-		& & Dataset quality &  \\\hline
+		& & Dataset quality &  \\
 
 		\bottomrule
 	\end{tabular}
-	\label{tab:tuple_sta}
+	\label{tab:topics}
 
 \end{table*}

5-study_metric.tex

@@ -1,2 +1,22 @@
 \section{Metrics Used to Study Pull Request}
 
+\begin{table*}[h]
+
+	\centering
+	\caption{Metrics studied in previous research.}
+	\begin{tabular}{@{}l l l l@{}}
+		\toprule	
+		\textbf{Category} & \textbf{Sub-Category} & \textbf{Metric} & \textbf{Description} \\ \midrule
+		\multirow{4}*{Project characteristics} 
+		& & \texttt{proj\_name}&  \\
+		& & \texttt{language}&  \\
+		& & \texttt{domain}&  \\
+		& & \texttt{proj\_age}&  \\
+		& & \texttt{hotness}&  \\
+		& & \texttt{proj\_sloc}&  \\\hline
+
+		\bottomrule
+	\end{tabular}
+	\label{tab:metrics}
+
+\end{table*}

6-data-size.tex

@@ -0,0 +1,18 @@
+\section{Dataset size}
+
+\begin{table}[h]
+
+	\centering
+	\caption{The statistics of dataset size}
+	\begin{tabular}{@{}l ccccc c @{}}
+		\toprule 	
+		Studied ***&\textbf{Min} &\textbf{25\%} &\textbf{Median} &\textbf{75\%} &\textbf{Max}  &\textbf{Mean}  \\ \midrule
+		\#Project & 1 & 1 & 2 & 3 & 35 & 2.30  \\	
+		\#PR & 1 & 2 & 3 & 6 & 148 & 5.68  \\	
+		\#Interviewee & 1 & 2 & 3 & 6 & 148 & 5.68  \\
+		\#Survey respondents & 1 & 2 & 3 & 6 & 148 & 5.68  \\	
+		\bottomrule	
+	\end{tabular}
+	\label{tab:dtsize}
+
+\end{table}

main.tex

@@ -106,6 +106,7 @@ This work was supported by National Grand R\&D Plan (Grant No. 2018AAA0102304) a
 \input{3-research_trend.tex}
 \input{4-research_topic.tex}
 \input{5-study_metric.tex}
+\input{6-data-size.tex}
 
 \bibliographystyle{plain}
 \bibliography{ref}