Reference didnt appear in beamer slide

Question

\documentclass[12pt]{beamer}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage[T1]{tipa}
\usepackage{tipx}
\usetheme{Frankfurt}
\usefonttheme{serif}
\usecolortheme{dolphin}
\usepackage{ragged2e}
\usepackage{apacite}
\newcommand{\mathnrleg}{\textnormal{\textnrleg}}

\begin{document}
\begin{frame}
\begin{itemize}
\item The log-likelihood function for without any imputation method is 
\[
 l(\theta)= \sum_{i=1}^{n}  \delta_{E_i}\log[f(t_i)]+\delta_{R_i}\log [S(t_{R_i})]+\delta_{I_i}\log[S(t_{L_i})-S(t_{R_i})]
\]
\item The log-likelihood function for midpoint imputation method is 
\[
 l(\theta)= \sum_{i=1}^{n}  \delta_{E_i}\log[f(t_i)]+\delta_{R_i}\log [S(t_{R_i})]+\delta_{I_i}\log[f(\tilde t_i)]
\]
\end{itemize}
\end{frame}

\section{References}
\begin{frame}[allowframebreaks]
\frametitle{\bf References}
\nocite{*}
\bibliographystyle{apacite}
\bibliography{slide}
\end{frame}
\end{document}

Why my references wont appear in the slide? i have already run bibtex. bib:

@article{dwivedi2016survival,
  title={Survival analysis: A brief note},
  author={Dwivedi, Nidhi and Sachdeva, Sandeep and others},
  journal={Journal of Current Research in Scientific Medicine},
  volume={2},
  number={2},
  pages={73},
  year={2016},
  publisher={Medknow Publications}
}
@article{el2013generalized,
  title={The generalized Gompertz distribution},
  author={El-Gohary, Alshamrani and Alshamrani, Ahmad and Al-Otaibi, Adel Naif},
  journal={Applied Mathematical Modelling},
  volume={37},
  number={1},
  pages={13--24},
  year={2013},
  publisher={Elsevier}
}
@article{weymouth1931latitude,
  title={Latitude and relative growth in the razor clam, Siliqua patula},
  author={Weymouth, FW and McMillin, HC and Rich, Willis H},
  journal={Journal of Experimental Biology},
  volume={8},
  number={3},
  pages={228--249},
  year={1931},
  publisher={The Company of Biologists Ltd}
}
@book{weymouth1931age,
  title={The age and growth of the Pacific cockle (Cardium corbis, Martyn)},
  author={Weymouth, Frank Walter and Thompson, Seton Hayes},
  number={1101},
  year={1931},
  publisher={US Government Printing Office}
}
@article{tjorve2017use,
  title={The use of Gompertz models in growth analyses, and new Gompertz-model approach: An addition to the Unified-Richards family},
  author={Tj{\o}rve, Kathleen MC and Tj{\o}rve, Even},
  journal={PloS one},
  volume={12},
  number={6},
  pages={e0178691},
  year={2017},
  publisher={Public Library of Science}
}
@article{gompertz1825nature,
  title={On the nature of the function expressive of the law of human mortality, and on a new mode of determining the value of life contingencies},
  author={Gompertz, Benjamin},
  journal={Philosophical transactions of the Royal Society of London},
  volume={115},
  pages={513--583},
  year={1825},
  publisher={JSTOR}
}
@article{davidson1928growth,
  title={Growth and senescence in purebred Jersey cows},
  author={Davidson, Frederick Alexander},
  journal={Bulletin (University of Illinois (Urbana-Champaign campus). Agricultural Experiment Station); no. 302},
  year={1928},
  publisher={Urbana, Ill.: University of Illinois Agricultural Experiment Station,}
}
@article{laird1964dynamics,
  title={Dynamics of tumour growth},
  author={Laird, Anna Kane},
  journal={British journal of cancer},
  volume={18},
  number={3},
  pages={490},
  year={1964},
  publisher={Nature Publishing Group}
}
@article{gibson1987effect,
  title={The effect of sodium chloride and temperature on the rate and extent of growth of Clostridium botulinum type A in pasteurized pork slurry},
  author={Gibson, Angela M and Bratchell, N and Roberts, TA},
  journal={Journal of Applied microbiology},
  volume={62},
  number={6},
  pages={479--490},
  year={1987},
  publisher={Wiley Online Library}
}
@article{riffenburgh2001survival,
  title={Survival patterns of cancer patients},
  author={Riffenburgh, RH and Johnstone, PAS},
  journal={Cancer},
  volume={91},
  number={12},
  pages={2469--2475},
  year={2001},
  publisher={Wiley Online Library}
}
@article{gordon1990maximum,
  title={Maximum likelihood estimation for mixtures of two Gompertz distributions when censoring occurs},
  author={Gordon, NH},
  journal={Communications in Statistics-Simulation and Computation},
  volume={19},
  number={2},
  pages={733--747},
  year={1990},
  publisher={Taylor \& Francis}
}
@article{lenart2012gompertz,
  title={The Gompertz distribution and Maximum Likelihood Estimation of its parameters-a revision},
  author={Lenart, Adam and others},
  journal={MPDIR Work Pap},
  volume={49},
  pages={0--19},
  year={2012}
}
@article{chen1997parameter,
  title={Parameter estimation of the Gompertz population},
  author={Chen, Zhenmin},
  journal={Biometrical Journal},
  volume={39},
  number={1},
  pages={117--124},
  year={1997},
  publisher={Wiley Online Library}
}
@article{arasan2008alternative,
  title={Alternative interval estimation for parameters of bivariate exponential model with time varying covariate},
  author={Arasan, Jayanthi and Lunn, Mary},
  journal={Computational Statistics},
  volume={23},
  number={4},
  pages={605--622},
  year={2008},
  publisher={Springer}
}
@article{arasan2009interval,
  title={Interval estimation for parameters of a bivariate time varying covariate model},
  author={Arasan, Jayanthi},
  journal={Pertanika Journal of Science and Technology},
  volume={17},
  number={2},
  pages={313--323},
  year={2009}
}
@article{arasan2009survival,
  title={Survival model of a parallel system with dependent failures and time varying covariates},
  author={Arasan, Jayanthi and Lunn, Mary},
  journal={Journal of Statistical Planning and Inference},
  volume={139},
  number={3},
  pages={944--951},
  year={2009},
  publisher={Elsevier}
}
@article{efron1985bootstrap,
  title={Bootstrap confidence intervals for a class of parametric problems},
  author={Efron, Bradley},
  journal={Biometrika},
  volume={72},
  number={1},
  pages={45--58},
  year={1985},
  publisher={Oxford University Press}
}
@article{kiani2013gompertz,
  title={Gompertz model with time-dependent covariate in the presence of interval-, right-and left-censored data},
  author={Kiani, Kaveh and Arasan, Jayanthi},
  journal={Journal of Statistical Computation and Simulation},
  volume={83},
  number={8},
  pages={1472--1490},
  year={2013},
  publisher={Taylor \& Francis}
}
@inproceedings{dunnigan2008confidence,
  title={Confidence interval calculation for binomial proportions},
  author={Dunnigan, Keith},
  booktitle={Midwest SAS Users Group Conference, Indianapolis, Ind},
  year={2008}
}
@book{cox1979theoretical,
  title={Theoretical statistics},
  author={Cox, David Roxbee and Hinkley, David Victor},
  year={1979},
  publisher={CRC Press}
}
@misc{StatNews5,
 author= "{Cornell University Cornell Statistical Consulting Unit}",
  title = {What is Maximum Likelihood?},
  howpublished = {\url{https://www.cscu.cornell.edu/news/statnews/stnews50.pdf}},
  note = {Online; Accessed 8 December 2017},
  year = {2002},
} 
@book{lee2003statistical,
  title={Statistical methods for survival data analysis},
  author={Lee, Elisa T and Wang, John},
  volume={476},
  year={2003},
  publisher={John Wiley \& Sons}
}
@article{clark2003survival,
  title={Survival analysis part I: basic concepts and first analyses},
  author={Clark, TG and Bradburn, MJ and Love, SB and Altman, DG},
  journal={British journal of cancer},
  volume={89},
  number={2},
  pages={232},
  year={2003},
  publisher={Nature Publishing Group}
}
@book{miller2010inverse,
  title={Inverse Transform Sampling},
  author={Miller, F.P. and Vandome, A.F. and John, M.B.},
  isbn={9786131753268},
  year={2010},
  publisher={VDM Publishing}
}
@book{wicklin2013simulating,
  title={Simulating data with SAS},
  author={Wicklin, Rick},
  year={2013},
  publisher={SAS Institute}
}
@book{frieden2010exploratory,
  title={Exploratory data analysis using Fisher information},
  author={Frieden, Roy and Gatenby, Robert A},
  year={2010},
  publisher={Springer Science \& Business Media}
}
@book{everitt2005encyclopedia,
  title={Encyclopedia of statistics in behavioral science.},
  author={Everitt, Brian S and Howell, David C},
  year={2005},
  publisher={John Wiley \& Sons Ltd}
}
@article{arasan2014double,
  title={Double bootstrap confidence interval estimates with censored and truncated data},
  author={Arasan, Jayanthi and Adam, Mohd B},
  journal={Journal of Modern Applied Statistical Methods},
  volume={13},
  number={2},
  pages={22},
  year={2014}
}
@article{kiani2012interval,
  title={Interval estimations for parameters of Gompertz model with time-dependent covariate and right censored data},
  author={Kiani, Kaveh and Arasan, Jayanthi and Midi, Habshah},
  journal={Sains Malaysiana},
  volume={41},
  number={4},
  pages={471--480},
  year={2012}
}
@book{efron1982jackknife,
  title={The jackknife, the bootstrap and other resampling plans},
  author={Efron, Bradley},
  year={1982},
  publisher={SIAM}
}
@book{efron1994introduction,
  title={An introduction to the bootstrap},
  author={Efron, Bradley and Tibshirani, Robert J},
  year={1994},
  publisher={CRC press}
}
@inproceedings{fang2015jackknife,
  title={Jackknife and bootstrap inferential procedures for censored survival data},
  author={Fang, Loh Yue and Arasan, Jayanthi and Midi, Habshah and Bakar, Mohd Rizam Abu},
  booktitle={AIP Conference Proceedings},
  volume={1682},
  number={1},
  pages={050021},
  year={2015},
  organization={AIP Publishing}
}
@article{hosmer1999applied,
  title={Applied survival analysis: regression modelling of time to event data (1999)},
  author={Hosmer Jr, David W and Lemeshow, Stanley},
  journal={Eur Orthodontic Soc},
  pages={561--2},
  year={1999}
}
@book{lawless2011statistical,
  title={Statistical models and methods for lifetime data},
  author={Lawless, Jerald F},
  volume={362},
  year={2011},
  publisher={John Wiley \& Sons}
}
@book{collett2015modelling,
  title={Modelling survival data in medical research},
  author={Collett, David},
  year={2015},
  publisher={CRC press}
}
@inproceedings{smith2001survival,
  title={Survival analysis and the application of Cox's proportional hazards modeling using SAS},
  author={Smith, Tyler and Smith, Besa},
  booktitle={Proceedings of the twenty-sixth annual SAS user's group international conference},
  pages={244--246},
  year={2001},
  organization={SAS Institute Inc Cary (NC)}
}