Addition of ltablex makes tabularx loses formatting

I created a table T, which looked great. I wanted to create another table spanning multiple pages, and hence I add a package called ltablex. Turns out that just the addition of this package makes the table T loses formatting.

The code is given below. If you comment out \usepackage{ltablex}, then you will find that the table regains formatting - centered and all. Look at the two pictures, after addition of \usepackage{ltablex}, and before that. Please suggest me what package to use to maintain X features in a table and which can be spanned across multiple pages. Thanks!

\documentclass[11pt]{article}
\usepackage{setspace,amssymb,amsmath}
\usepackage[tablename=TABLE,labelsep=newline,
aboveskip=0pt,font=bf,justification=centering]{caption}
\usepackage{booktabs,tabularx}
\usepackage[margin=1in]{geometry}
\usepackage[autostyle]{csquotes}
\usepackage[table]{xcolor}
\usepackage{ltablex}

\newcolumntype{Y}{>{\centering\arraybackslash}X}
\newcommand{\gmc}[3]{\multicolumn{#1}{@{}#2@{}}{#3}}

\doublespacing

\begin{document}

\newpage
\begingroup % keep any font size changes local to group
\captionof{table}{Descriptive Statistics}
\singlespacing
\small
\setlength\tabcolsep{6pt} %default
\renewcommand{\arraystretch}{0.95}

\begin{tabularx}{\linewidth}{@{}l*5{Y}@{}}
\toprule
& Mean & Median & Std. Dev. & 25th Pctl & 75th Pctl \\\midrule
$\Delta RealEstate_{region}$ = 1 &  0.004 & 0.003 & 0.010 & -0.003 &    0.010 \\
$\Delta RealEstate_{region}$ = 2    &0.002& 0.003&  0.013&  -0.002& 0.008 \\
$\Delta RealEstate_{region}$ = 3    &0.003& 0.003&  0.012&  -0.001& 0.009 \\
$\Delta RealEstate_{region}$ = 4&   0.002&  0.003&  0.009&  -0.002& 0.007\\
$\Delta RealEstate_{region}$ = 5&   0.005&  0.005&  0.011&  -0.002& 0.012\\
$\Delta RealEstate_{region}$ = 6&   0.005&  0.005&  0.013&  -0.002& 0.012\\
$\Delta RealEstate_{region}$ = 7&   0.004&  0.004&  0.008&  0.000&  0.009\\
$\Delta RealEstate_{region}$ = 8&   0.003&  0.004&  0.011&  -0.001& 0.009\\
$\Delta RealEstate_{region}$ = 9&   0.004&  0.003&  0.010&  -0.003& 0.011\\
$\Delta RealEstate_{region}$ = 10&  0.002&  0.003&  0.006&  -0.001& 0.006\\
$\Delta RealEstate_{region}$ = 11&  0.004&  0.004&  0.009&  0.000&  0.009\\
$\Delta RealEstate_{region}$ = 12&  0.004&  0.004&  0.010&  -0.001& 0.009\\
$\Delta RealEstate_{region}$ = 13&  0.003&  0.004&  0.013&  0.000&  0.007\\
$\Delta RealEstate_{region}$ = 14&  0.004&  0.005&  0.011&  -0.002& 0.011\\
$\Delta RealEstate_{region}$ = 15&  0.002&  0.002&  0.009&  -0.002& 0.007\\
$\Delta RealEstate_{region}$ = 16&  0.004&  0.004&  0.010&  0.000&  0.010\\
$\Delta RealEstate_{region}$ = 17&  0.002&  0.002&  0.010&  -0.002& 0.007\\
$\Delta RealEstate_{region}$ = 18&  0.002&  0.003&  0.011&  0.000&  0.006\\
$\Delta RealEstate_{region}$ = 19&  0.002&  0.003&  0.014&  -0.002& 0.008\\
$\Delta RealEstate_{region}$ = 20&  0.004&  0.004&  0.012&  -0.002& 0.011\\
$\Delta RealEstate_{region}$ = 21&  0.003&  0.006&  0.011&  -0.002& 0.010\\
$\Delta RealEstate_{region}$ = 22&  0.003&  0.004&  0.009&  -0.002& 0.010\\
$\Delta Prof$&  0.000&  0.001&  0.020&  -0.006& 0.008\\
RETURN& 0.020&  0.022&  0.071&  -0.019& 0.065\\
GDP&    0.024&  0.025&  0.032&  0.013&  0.042\\
TBILL&  0.057&  0.056&  0.036&  0.033&  0.079\\
INFLATION&  0.043&  0.035&  0.035&  0.024&  0.057\\
CORP&   0.101&  0.067&  0.243&  -0.068& 0.222\\
TERM&   -0.012& -0.013& 0.012&  -0.020& -0.003\\
$\Delta Prof_{region}$ =1&  0.002&  0.003&  0.028&  -0.008& 0.014\\
$\Delta Prof_{region}$ =2&  -0.001& 0.000&  0.030&  -0.013& 0.014\\
$\Delta Prof_{region}$ =3&  0.001&  0.002&  0.042&  -0.009& 0.014\\
$\Delta Prof_{region}$ =4&  0.000&  0.001&  0.021&  -0.008& 0.011\\
$\Delta Prof_{region}$ =5&  0.011&  0.007&  0.066&  -0.014& 0.043\\
$\Delta Prof_{region}$ =6&  0.009&  0.006&  0.035&  -0.009& 0.027\\
$\Delta Prof_{region}$ =7&  -0.001& 0.001&  0.066&  -0.028& 0.026\\
$\Delta Prof_{region}$ =8&  0.002&  0.000&  0.027&  -0.008& 0.007\\
$\Delta Prof_{region}$ =9&  -0.001& 0.001&  0.035&  -0.011& 0.013\\
$\Delta Prof_{region}$ =10& -0.002& 0.000&  0.043&  -0.010& 0.015\\
$\Delta Prof_{region}$ =11& -0.002& 0.000&  0.030&  -0.017& 0.015\\
$\Delta Prof_{region}$ =12& 0.006&  0.007&  0.052&  -0.022& 0.029\\
$\Delta Prof_{region}$ =13& 0.004&  0.000&  0.291&  -0.020& 0.020\\
$\Delta Prof_{region}$ =14& 0.002&  0.004&  0.021&  -0.010& 0.015\\
$\Delta Prof_{region}$ =15& -0.003& 0.001&  0.039&  -0.014& 0.012\\
$\Delta Prof_{region}$ =16& 0.000&  0.000&  0.026&  -0.013& 0.016\\
$\Delta Prof_{region}$ =17& -0.003& 0.001&  0.040&  -0.008& 0.012\\
$\Delta Prof_{region}$ =18& -0.007& -0.002& 0.046&  -0.010& 0.006\\
$\Delta Prof_{region}$ =19& 0.010&  0.008&  0.083&  -0.015& 0.028\\
$\Delta Prof_{region}$ =20& 0.000&  0.002&  0.029&  -0.009& 0.012\\
$\Delta Prof_{region}$ =21& 0.002&  0.003&  0.028&  -0.008& 0.014\\
$\Delta Prof_{region}$ =22& 0.002&  0.003&  0.021&  -0.007& 0.011\\
\bottomrule
\end{tabularx}

\newpage
\small \hrule\medskip
Notes: The table provides descriptive statistics for key variables. $\Delta RealEstate_{region}$ = x is month-over-month real estate price change on the real estate region x index. $\Delta Prof_{region}$ = x is quarterly accounting profitability change for region x, and $\Delta Prof$ is the quarterly accounting profitability change over all firms in the economy. The regional classification is as follows: region 1 = DC-Washington; region 2 = MI-Detroit; region 3 = MN-Minneapolis; region 4 = OH-Cleveland; region 5 = CA-San Diego; region 6 = CA-San Francisco; region 7 = CO-Denver; region 8 = IL-Chicago; region 9 = MA-Boston; region 10 = NC-Charlotte; region 11 = OR-Portland; region 12 = WA-Seattle; region 13 = AZ-Phoenix; region 14 = CA-Los Angeles; region 15 = TX-Dallas; region 16 = FL-Miami; region 17 = FL-Tampa; region 18 = GA-Atlanta; region 19 = NV-Las Vegas; region 20 = NY-New York; region 21 = 20-city composite; region 22 = 10-city composite. RETURN is the quarterly buy-and-hold return on the stock market index (i.e., the S\&P Stock Composite Index); GDP is the quarterly realization of GDP growth in real terms; TBILL is the yield on the one-year constant maturity Treasury bill; INFLATION is based on the realization of the consumer price index for the quarter; CORP is quarterly growth in corporate profits calculated by the Bureau of Economic Analysis; TERM is the yield on the ten-year constant maturity Treasury bond minus the yield on the one-year constant maturity Treasury bill. To develop measures of regional accounting profitability changes, I sort firms into regions based on the location of their headquarters. Using firms in each region, I construct quarterly indices of regional accounting profitability changes based on earnings reports available in real time. I measure accounting profit for firm $i$ in quarter $q$ ($Prof_{i,q}$) as scaled quarterly operating income before depreciation. I measure accounting profitability change ($\Delta Prof_{i,q}$) as the year-over-year change in $Prof_{i,q}$. To mitigate the effects of outliers, I trim a firm's profits and profit changes based on the top and bottom one percentile of each quarterly cross-section. To avoid negative denominator problems, I scale profits by sales. Regional quarterly time series of profits (Prof) and profit changes ($\Delta Prof$) are based on value-weighted cross-sectional averages, with weights based on market value of equity as of the beginning of each quarter. For a firm-quarter to be included in the sample it must have nonmissing values for market value of equity, $\Delta Prof_{i,q}$, and the quarterly earnings announcement date. Accounting variables are from the Compustat North America Fundamentals Quarterly File (WRDS: FUNDQ) available from WRDS. Treasury bond and bill yields from the Federal Reserve Board of Governors H15 Report; and GDP, inflation, and corporate profits from the Philadelphia's Fed Real-Time Data Research Center, where these Fed's data are quarterly and stated in annual rates. Case-Shiller Home Price Indices are from the S\&P Dow Jones Indices website. The analyses throughout employ varying samples, to allow for feasible information flows and following the Case-Shiller coverage of the housing data that vary by regions. Specifically, following the Case-Shiller coverage, real estate price changes include 182 to 518 observations depending on the region. In terms of alignment with accounting data, analyses of stock investment strategies use observations as reported in the related table. For analyses predicting future real estate price changes I calculate regional accounting profitability changes using quarterly accounting observations over the period from Q4:1972 to Q4:2014 (n = 168 quarters).
\medskip
\hrule
\endgroup


\end{document}

• you are asking a lot of questions, it doesn't hurt to check the package documentation sometimes. ltablex is quite explicit that it changes the definition of tabularx environments. Also as I have commented on several of your questions tabularx is entirely the wrong thing to use for this kind of table. – David Carlisle Jun 20 '16 at 7:58

Actually, ltablex doesn't work exactly like tabularx: the calculated size of the X columns is a maximum width for this column, its actual width depending on its actual content. If you don't want it, use the \keepXColumns directive.

However, I would rather load siunitx and use the the S column type, to get a correct alignment of numerical values on the decimal dot. I need a little hack to get the column heads centred, as some heads are wider than what's required for the numerical values.

Also, I inserted the caption inside the first head (just like for long tables). Here's the result, with the first column of type X, without the directive:

\documentclass[11pt]{article}
\usepackage{setspace,amssymb,amsmath}
\usepackage[tablename=TABLE,labelsep=newline,
aboveskip=0pt,font=bf,justification=centering]{caption}
\usepackage{booktabs,tabularx}
\usepackage[margin=1in, showframe]{geometry}
\usepackage[autostyle]{csquotes}
\usepackage[table]{xcolor}
\usepackage{ltablex}
\usepackage{siunitx} \newcolumntype{Y}{>{\centering\arraybackslash}X}
\newcommand{\gmc}[3]{\multicolumn{#1}{@{}#2@{}}{#3}}

\doublespacing

\begin{document}

\newpage
\begingroup % keep any font size changes local to group
%\captionof{table}{Descriptive Statistics}
\singlespacing
\small
\setlength\tabcolsep{10pt} %default
%%\renewcommand{\arraystretch}{0.95}
%\keepXColumns
\begin{tabularx}{\linewidth}{@{}X*{2}{S[table-format =-1.3]}S[table-format =1.3]*{2}{S[table-format =-1.3]}@{\enspace}}
\caption{Descriptive Statistics}\\
\toprule
& {Mean} & {Median} & {\makebox[0pt]{Std. Dev.}} & {\makebox[0pt]{25th Pctl}} & {\makebox[0pt]{75th Pctl}} \\\midrule
\toprule
& {Mean} & {Median} & {\makebox[0pt]{Std. Dev.}} & {\makebox[0pt]{25th Pctl}} & {\makebox[0pt]{75th Pctl}} \\\midrule
\midrule
\endfoot
\bottomrule
\\
\endlastfoot
$\Delta \text{RealEstate}\textsubscript{region} = 1$ & 0.004 & 0.003 & 0.010 & -0.003 & 0.010 \\
$\Delta \text{RealEstate}\textsubscript{region} = 2$ &0.002& 0.003& 0.013& -0.002& 0.008 \\
$\Delta \text{RealEstate}\textsubscript{region} = 3$ &0.003& 0.003& 0.012& -0.001& 0.009 \\
$\Delta \text{RealEstate}\textsubscript{region} = 4$ & 0.002& 0.003& 0.009& -0.002& 0.007\\
$\Delta \text{RealEstate}\textsubscript{region} = 5$ & 0.005& 0.005& 0.011& -0.002& 0.012\\
$\Delta \text{RealEstate}\textsubscript{region} = 6$ & 0.005& 0.005& 0.013& -0.002& 0.012\\
$\Delta \text{RealEstate}\textsubscript{region} = 7$ & 0.004& 0.004& 0.008& 0.000& 0.009\\
$\Delta \text{RealEstate}\textsubscript{region} = 8$ & 0.003& 0.004& 0.011& -0.001& 0.009\\
$\Delta \text{RealEstate}\textsubscript{region} = 9$ & 0.004& 0.003& 0.010& -0.003& 0.011\\
$\Delta \text{RealEstate}\textsubscript{region} = 10$ & 0.002& 0.003& 0.006& -0.001& 0.006\\
$\Delta \text{RealEstate}\textsubscript{region} = 11$ & 0.004& 0.004& 0.009& 0.000& 0.009\\
$\Delta \text{RealEstate}\textsubscript{region} = 12$ & 0.004& 0.004& 0.010& -0.001& 0.009\\
$\Delta \text{RealEstate}\textsubscript{region} = 13$ & 0.003& 0.004& 0.013& 0.000& 0.007\\
$\Delta \text{RealEstate}\textsubscript{region} = 14$ & 0.004& 0.005& 0.011& -0.002& 0.011\\
$\Delta \text{RealEstate}\textsubscript{region} = 15$ & 0.002& 0.002& 0.009& -0.002& 0.007\\
$\Delta \text{RealEstate}\textsubscript{region} = 16$ & 0.004& 0.004& 0.010& 0.000& 0.010\\
$\Delta \text{RealEstate}\textsubscript{region} = 17$ & 0.002& 0.002& 0.010& -0.002& 0.007\\
$\Delta \text{RealEstate}\textsubscript{region} = 18$ & 0.002& 0.003& 0.011& 0.000& 0.006\\
$\Delta \text{RealEstate}\textsubscript{region} = 19$ & 0.002& 0.003& 0.014& -0.002& 0.008\\
$\Delta \text{RealEstate}\textsubscript{region} = 20$ & 0.004& 0.004& 0.012& -0.002& 0.011\\
$\Delta \text{RealEstate}\textsubscript{region} = 21$ & 0.003& 0.006& 0.011& -0.002& 0.010\\
$\Delta \text{RealEstate}\textsubscript{region} = 22$ & 0.003& 0.004& 0.009& -0.002& 0.010\\
$\Delta \text{Prof}$& 0.000& 0.001& 0.020& -0.006& 0.008\\
RETURN& 0.020& 0.022& 0.071& -0.019& 0.065\\
GDP& 0.024& 0.025& 0.032& 0.013& 0.042\\
TBILL& 0.057& 0.056& 0.036& 0.033& 0.079\\
INFLATION& 0.043& 0.035& 0.035& 0.024& 0.057\\
CORP& 0.101& 0.067& 0.243& -0.068& 0.222\\
TERM& -0.012& -0.013& 0.012& -0.020& -0.003\\
$\Delta \text{Prof}\textsubscript{region} = 1$ & 0.002& 0.003& 0.028& -0.008& 0.014\\
$\Delta \text{Prof}\textsubscript{region} = 2$ & -0.001& 0.000& 0.030& -0.013& 0.014\\
$\Delta \text{Prof}\textsubscript{region} = 3$ & 0.001& 0.002& 0.042& -0.009& 0.014\\
$\Delta \text{Prof}\textsubscript{region} = 4$ & 0.000& 0.001& 0.021& -0.008& 0.011\\
$\Delta \text{Prof}\textsubscript{region} = 5$ & 0.011& 0.007& 0.066& -0.014& 0.043\\
$\Delta \text{Prof}\textsubscript{region} = 6$ & 0.009& 0.006& 0.035& -0.009& 0.027\\
$\Delta \text{Prof}\textsubscript{region} = 7$ & -0.001& 0.001& 0.066& -0.028& 0.026\\
$\Delta \text{Prof}\textsubscript{region} = 8$ & 0.002& 0.000& 0.027& -0.008& 0.007\\
$\Delta \text{Prof}\textsubscript{region} = 9$ & -0.001& 0.001& 0.035& -0.011& 0.013\\
$\Delta \text{Prof}\textsubscript{region} = 10$ & -0.002& 0.000& 0.043& -0.010& 0.015\\
$\Delta \text{Prof}\textsubscript{region} = 11$ & -0.002& 0.000& 0.030& -0.017& 0.015\\
$\Delta \text{Prof}\textsubscript{region} = 12$ & 0.006& 0.007& 0.052& -0.022& 0.029\\
$\Delta \text{Prof}\textsubscript{region} = 13$ & 0.004& 0.000& 0.291& -0.020& 0.020\\
$\Delta \text{Prof}\textsubscript{region} = 14$ & 0.002& 0.004& 0.021& -0.010& 0.015\\
$\Delta \text{Prof}\textsubscript{region} = 15$ & -0.003& 0.001& 0.039& -0.014& 0.012\\
$\Delta \text{Prof}\textsubscript{region} = 16$ & 0.000& 0.000& 0.026& -0.013& 0.016\\
$\Delta \text{Prof}\textsubscript{region} = 17$ & -0.003& 0.001& 0.040& -0.008& 0.012\\
$\Delta \text{Prof}\textsubscript{region} = 18$ & -0.007& -0.002& 0.046& -0.010& 0.006\\
$\Delta \text{Prof}\textsubscript{region} = 19$ & 0.010& 0.008& 0.083& -0.015& 0.028\\
$\Delta \text{Prof}\textsubscript{region} = 20$ & 0.000& 0.002& 0.029& -0.009& 0.012\\
$\Delta \text{Prof}\textsubscript{region} = 21$ & 0.002& 0.003& 0.028& -0.008& 0.014\\
$\Delta \text{Prof}\textsubscript{region} = 22$ & 0.002& 0.003& 0.021& -0.007& 0.011
\end{tabularx}

\newpage
\small \hrule\medskip
Notes: The table provides descriptive statistics for key variables. $\Delta \text{RealEstate}\textsubscript{region}$ = x is month-over-month real estate price change on the real estate region x index. $\Delta Prof_{region}$ = x is quarterly accounting profitability change for region x, and $\Delta Prof$ is the quarterly accounting profitability change over all firms in the economy. The regional classification is as follows: region 1 = DC-Washington; region 2 = MI-Detroit; region 3 = MN-Minneapolis; region 4 = OH-Cleveland; region 5 = CA-San Diego; region 6 = CA-San Francisco; region 7 = CO-Denver; region 8 = IL-Chicago; region 9 = MA-Boston; region 10 = NC-Charlotte; region 11 = OR-Portland; region 12 = WA-Seattle; region 13 = AZ-Phoenix; region 14 = CA-Los Angeles; region 15 = TX-Dallas; region 16 = FL-Miami; region 17 = FL-Tampa; region 18 = GA-Atlanta; region 19 = NV-Las Vegas; region 20 = NY-New York; region 21 = 20-city composite; region 22 = 10-city composite. RETURN is the quarterly buy-and-hold return on the stock market index (i.e., the S\&P Stock Composite Index); GDP is the quarterly realization of GDP growth in real terms; TBILL is the yield on the one-year constant maturity Treasury bill; INFLATION is based on the realization of the consumer price index for the quarter; CORP is quarterly growth in corporate profits calculated by the Bureau of Economic Analysis; TERM is the yield on the ten-year constant maturity Treasury bond minus the yield on the one-year constant maturity Treasury bill. To develop measures of regional accounting profitability changes, I sort firms into regions based on the location of their headquarters. Using firms in each region, I construct quarterly indices of regional accounting profitability changes based on earnings reports available in real time. I measure accounting profit for firm $i$ in quarter $q$ ($Prof_{i,q}$) as scaled quarterly operating income before depreciation. I measure accounting profitability change ($\Delta Prof_{i,q}$) as the year-over-year change in $Prof_{i,q}$. To mitigate the effects of outliers, I trim a firm's profits and profit changes based on the top and bottom one percentile of each quarterly cross-section. To avoid negative denominator problems, I scale profits by sales. Regional quarterly time series of profits (Prof) and profit changes ($\Delta Prof$) are based on value-weighted cross-sectional averages, with weights based on market value of equity as of the beginning of each quarter. For a firm-quarter to be included in the sample it must have nonmissing values for market value of equity, $\Delta Prof_{i,q}$, and the quarterly earnings announcement date. Accounting variables are from the Compustat North America Fundamentals Quarterly File (WRDS: FUNDQ) available from WRDS. Treasury bond and bill yields from the Federal Reserve Board of Governors H15 Report; and GDP, inflation, and corporate profits from the Philadelphia's Fed Real-Time Data Research Center, where these Fed's data are quarterly and stated in annual rates. Case-Shiller Home Price Indices are from the S\&P Dow Jones Indices website. The analyses throughout employ varying samples, to allow for feasible information flows and following the Case-Shiller coverage of the housing data that vary by regions. Specifically, following the Case-Shiller coverage, real estate price changes include 182 to 518 observations depending on the region. In terms of alignment with accounting data, analyses of stock investment strategies use observations as reported in the related table. For analyses predicting future real estate price changes I calculate regional accounting profitability changes using quarterly accounting observations over the period from Q4:1972 to Q4:2014 (n = 168 quarters).
\medskip
\hrule
\endgroup

\end{document}