Remove spacing within text block

Question

In my MWE below, I am using \parskip = \baselineskip but wanted to remove the following spacings:

Here is my code:

\documentclass[11pt]{book}

\usepackage{enumitem}
\setlist{nolistsep}
\usepackage{amsmath,amsfonts,amssymb,amsthm, bm}

\parskip = \baselineskip

\begin{document}
\chapter{Problems from Chapter 9}

\section{Problem 9-3}\index{Problem 9-3}

\subsection{Problem 9-3}
(Sorenson, 1980, Exercise 3-15, p. 130).  Suppose $\theta_{1}$ and $\theta_{2}$ are unbiased estimators of $\theta$ with var$(\theta_{1}) = \sigma_{1}^{2}$ and var$(\theta_{2}) = \sigma_{2}^{2}$.  Let $\theta_{3} = \alpha\theta_{1} + (1-\alpha)\theta_{2}$.
\noindent
\begin{enumerate}[align=left,style=nextline,leftmargin=*,labelsep=\parindent,label=\textbf{(\alph*)}]
\item Prove that $\theta_{3}$ is unbiased.
\item Assume that $\theta_{1}$ and $\theta_{2}$ are statically independent, and find the measured squared error of $\theta_{3}$.
\item What choice of $\alpha$ minimizes the mean-squared error?
\end{enumerate}

\end{document}

How can remove the indicated spacings?

score 3 · Accepted Answer · 2015-10-15T22:52:57.197

First one is a sub section and hence you can load titlesec package and use its titlespacing* macro

\usepackage{titlesec}
\titlespacing*{\subsection}{0pt}{0pt}{-10pt}

The third argument is the space after (below) the title which I have made -10pt. Adjust as you wish.

For the second space, you can apply the original \parskip value (i. e., 0pt plus 1pt) only for the enumerate by

before=\setlength{\parskip}{0pt plus 1pt},align=left,....

in the options.

\documentclass[11pt]{book}

\usepackage{enumitem}
\setlist{nolistsep}
\usepackage{amsmath,amsfonts,amssymb,amsthm, bm}

\parskip = \baselineskip


\usepackage{titlesec}
\titlespacing*{\subsection}{0pt}{0pt}{-10pt}




\begin{document}
\chapter{Problems from Chapter 9}

\section{Problem 9-3}\index{Problem 9-3}
\subsection{Problem 9-3}
(Sorenson, 1980, Exercise 3-15, p. 130).  Suppose $\theta_{1}$ and $\theta_{2}$ are unbiased estimators of $\theta$ with var$(\theta_{1}) = \sigma_{1}^{2}$ and var$(\theta_{2}) = \sigma_{2}^{2}$.  Let $\theta_{3} = \alpha\theta_{1} + (1-\alpha)\theta_{2}$.
%
\begin{enumerate}[before=\setlength{\parskip}{0pt plus 1pt},align=left,style=nextline,leftmargin=*, labelsep=\parindent,label=\textbf{(\alph*)}]
\item Prove that $\theta_{3}$ is unbiased.
\item Assume that $\theta_{1}$ and $\theta_{2}$ are statically independent, and find the measured squared error of $\theta_{3}$.
\item What choice of $\alpha$ minimizes the mean-squared error?
\end{enumerate}

\end{document}

Instead of adjusting \parskip yourself, you may use parskip package which gives better spacing.

\documentclass[11pt]{book}

\usepackage{enumitem}
\setlist{nolistsep}
\usepackage{amsmath,amsfonts,amssymb,amsthm, bm}

\usepackage[parfill]{parskip}


\begin{document}
\chapter{Problems from Chapter 9}

\section{Problem 9-3}\index{Problem 9-3}
\subsection{Problem 9-3}
(Sorenson, 1980, Exercise 3-15, p. 130).  Suppose $\theta_{1}$ and $\theta_{2}$ are unbiased estimators of $\theta$ with var$(\theta_{1}) = \sigma_{1}^{2}$ and var$(\theta_{2}) = \sigma_{2}^{2}$.  Let $\theta_{3} = \alpha\theta_{1} + (1-\alpha)\theta_{2}$.
%
\begin{enumerate}[align=left,style=nextline,leftmargin=*, labelsep=\parindent,label=\textbf{(\alph*)}]
\item Prove that $\theta_{3}$ is unbiased.
\item Assume that $\theta_{1}$ and $\theta_{2}$ are statically independent, and find the measured squared error of $\theta_{3}$.
\item What choice of $\alpha$ minimizes the mean-squared error?
\end{enumerate}

\end{document}

Remove spacing within text block

1 Answers1